Notification

Theme Variants
Duration
Position
Stacking
Size
Interactive Elements
Icons and Other Rich Formatting
Static Helper
Best Practices
Related Components

Notifications are used to provide feedback to the user. They communicate information about activities, processes, and events in the application.

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Source code

notification-basic-preview.tsimport { html, LitElement } from 'lit';
import '@vaadin/notification';
import { applyTheme } from 'Frontend/generated/theme';

export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-notification-card slot="middle">
        Financial report generated
      </vaadin-notification-card>
    `;
  }
}
notification-basic-preview.ts

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Source code

notification-basic.tsimport { html, LitElement } from 'lit';
import { customElement, state } from 'lit/decorators.js';
import '@vaadin/button';
import { Notification } from '@vaadin/notification';
import type { NotificationOpenedChangedEvent } from '@vaadin/notification';
import { applyTheme } from 'Frontend/generated/theme';

@customElement('notification-basic')
export class Example extends LitElement {
  @state()
  private notificationOpened = false;

  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  handleClick() {
    // tag::snippet[]
    const notification = Notification.show('Financial report generated', {
      position: 'middle',
    });
    // end::snippet[]
    this.notificationOpened = true;
    const handleOpenChanged = (e: NotificationOpenedChangedEvent) => {
      if (!e.detail.value) {
        this.notificationOpened = false;
        notification.removeEventListener('opened-changed', handleOpenChanged);
      }
    };
    notification.addEventListener('opened-changed', handleOpenChanged);
  }

  protected override render() {
    return html`
      <vaadin-button @click="${this.handleClick}" .disabled="${this.notificationOpened}">
        Try it
      </vaadin-button>
    `;
  }
}
NotificationBasic.javapackage com.vaadin.demo.component.notification;

import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.router.Route;


@Route("notification-basic")
public class NotificationBasic extends Div {

    public NotificationBasic() {
        Button button = new Button("Try it");
        button.addClickListener(clickEvent -> {
            button.setEnabled(false);

            // tag::snippet[]
            // When creating a notification using the `show` static method,
            // the duration is 5-sec by default.
            Notification notification = Notification
                    .show("Financial report generated");
            // end::snippet[]
            notification.setPosition(Notification.Position.MIDDLE);

            notification
                    .addDetachListener(detachEvent -> button.setEnabled(true));
        });

        add(button);
    }

}

Theme Variants

Success

The success theme variant can be used to display success messages, such as when a task or operation is completed.

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Source code

notification-success-preview.tsimport { html, LitElement } from 'lit';
import '@vaadin/notification';
import { applyTheme } from 'Frontend/generated/theme';

export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-notification-card theme="success" slot="middle">
        Application submitted!
      </vaadin-notification-card>
    `;
  }
}
notification-success-preview.ts

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Source code

notification-success.tsimport { html, LitElement } from 'lit';
import { customElement, state } from 'lit/decorators.js';
import '@vaadin/button';
import { Notification } from '@vaadin/notification';
import type { NotificationOpenedChangedEvent } from '@vaadin/notification';
import { applyTheme } from 'Frontend/generated/theme';

@customElement('notification-success')
export class Example extends LitElement {
  @state()
  private notificationOpened = false;

  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  handleClick() {
    // tag::snippet[]
    const notification = Notification.show('Application submitted!', {
      position: 'middle',
    });
    notification.setAttribute('theme', 'success');
    // end::snippet[]
    this.notificationOpened = true;
    const handleOpenChanged = (e: NotificationOpenedChangedEvent) => {
      if (!e.detail.value) {
        this.notificationOpened = false;
        notification.removeEventListener('opened-changed', handleOpenChanged);
      }
    };
    notification.addEventListener('opened-changed', handleOpenChanged);
  }

  protected override render() {
    return html`
      <vaadin-button @click="${this.handleClick}" .disabled="${this.notificationOpened}">
        Try it
      </vaadin-button>
    `;
  }
}
NotificationSuccess.javapackage com.vaadin.demo.component.notification;

import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.component.notification.NotificationVariant;
import com.vaadin.flow.router.Route;

@Route("notification-success")
public class NotificationSuccess extends Div {

    public NotificationSuccess() {
        Button button = new Button("Try it");
        button.addClickListener(clickEvent -> {
            button.setEnabled(false);

            // tag::snippet[]
            Notification notification = Notification
                    .show("Application submitted!");
            notification.addThemeVariants(NotificationVariant.LUMO_SUCCESS);
            // end::snippet[]
            notification.setPosition(Notification.Position.MIDDLE);

            notification
                    .addDetachListener(detachEvent -> button.setEnabled(true));
        });

        add(button);
    }

}

Successful operations shouldn’t routinely be declared using notifications, as these can be more distracting than useful for the user. Use success notifications only for operations whose successful completion may otherwise be difficult to discern.

Error

The error theme variant can be used to display alerts, failures, or warnings.

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Source code

notification-error-preview.tsimport { html, LitElement } from 'lit';
import '@vaadin/button';
import '@vaadin/horizontal-layout';
import '@vaadin/icon';
import '@vaadin/notification';
import '@vaadin/vaadin-lumo-styles/vaadin-iconset';
import { applyTheme } from 'Frontend/generated/theme';

export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-notification-card theme="error" slot="middle">
        <vaadin-horizontal-layout theme="spacing" style="align-items: center;">
          <div>Failed to generate report</div>
          <vaadin-button theme="tertiary-inline">
            <vaadin-icon icon="lumo:cross"></vaadin-icon>
          </vaadin-button>
        </vaadin-horizontal-layout>
      </vaadin-notification-card>
    `;
  }
}
notification-error-preview.ts

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Source code

notification-error.tsimport { html, LitElement } from 'lit';
import { customElement, state } from 'lit/decorators.js';
import '@vaadin/button';
import '@vaadin/horizontal-layout';
import '@vaadin/icon';
import '@vaadin/notification';
import type { NotificationOpenedChangedEvent } from '@vaadin/notification';
import { notificationRenderer } from '@vaadin/notification/lit.js';
import type { NotificationLitRenderer } from '@vaadin/notification/lit.js';
import '@vaadin/vaadin-lumo-styles/vaadin-iconset';
import { applyTheme } from 'Frontend/generated/theme';

@customElement('notification-error')
export class Example extends LitElement {
  @state()
  private notificationOpened = false;

  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-button .disabled="${this.notificationOpened}" @click="${this.open}">
        Try it
      </vaadin-button>

      <!-- tag::snippet[] -->
      <!-- The duration is set to 0-sec to prevent the notification from auto-close. -->
      <vaadin-notification
        theme="error"
        duration="0"
        position="middle"
        .opened="${this.notificationOpened}"
        @opened-changed="${(e: NotificationOpenedChangedEvent) => {
          this.notificationOpened = e.detail.value;
        }}"
        ${notificationRenderer(this.renderer, [])}
      ></vaadin-notification>
      <!-- end::snippet[] -->
    `;
  }

  renderer: NotificationLitRenderer = () => html`
    <vaadin-horizontal-layout theme="spacing" style="align-items: center;">
      <div>Failed to generate report</div>
      <vaadin-button theme="tertiary-inline" @click="${this.close}" aria-label="Close">
        <vaadin-icon icon="lumo:cross"></vaadin-icon>
      </vaadin-button>
    </vaadin-horizontal-layout>
  `;

  private open() {
    this.notificationOpened = true;
  }

  private close() {
    this.notificationOpened = false;
  }
}
NotificationError.javapackage com.vaadin.demo.component.notification;

import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.Text;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.button.ButtonVariant;
import com.vaadin.flow.component.icon.Icon;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.component.notification.NotificationVariant;
import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
import com.vaadin.flow.component.orderedlayout.FlexComponent.Alignment;
import com.vaadin.flow.router.Route;

@Route("notification-error")
public class NotificationError extends Div {

    public NotificationError() {
        Button button = new Button("Try it");
        button.addClickListener(clickEvent -> {
            button.setEnabled(false);

            Notification notification = show();
            notification
                    .addDetachListener(detachEvent -> button.setEnabled(true));
        });

        add(button);
    }

    public Notification show() {
        // tag::snippet[]
        // When creating a notification using the constructor,
        // the duration is 0-sec by default which means that
        // the notification does not close automatically.
        Notification notification = new Notification();
        notification.addThemeVariants(NotificationVariant.LUMO_ERROR);

        Div text = new Div(new Text("Failed to generate report"));

        Button closeButton = new Button(new Icon("lumo", "cross"));
        closeButton.addThemeVariants(ButtonVariant.LUMO_TERTIARY_INLINE);
        closeButton.getElement().setAttribute("aria-label", "Close");
        closeButton.addClickListener(event -> {
            notification.close();
        });

        HorizontalLayout layout = new HorizontalLayout(text, closeButton);
        layout.setAlignItems(Alignment.CENTER);

        notification.add(layout);
        notification.open();
        // end::snippet[]

        notification.setPosition(Notification.Position.MIDDLE);

        return notification;
    }

}

Error notifications should be persistent, and provide the user with a button that closes the notification and/or allows the user to take appropriate action.

Notifications are non-modal and can be ignored, making them inappropriate for displaying unexpected technical errors that prevent the application from functioning, or situations that require immediate user action. Use a modal Dialog in such situations.

Primary

The primary theme variant can be used for important informational messages and/or to draw extra attention to a notification.

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Source code

notification-primary-preview.tsimport { html, LitElement } from 'lit';
import '@vaadin/notification';
import { applyTheme } from 'Frontend/generated/theme';

export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-notification-card theme="primary" slot="middle">
        New project plan available
      </vaadin-notification-card>
    `;
  }
}
notification-primary-preview.ts

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Source code

notification-primary.tsimport { html, LitElement } from 'lit';
import { customElement, state } from 'lit/decorators.js';
import '@vaadin/button';
import { Notification } from '@vaadin/notification';
import type { NotificationOpenedChangedEvent } from '@vaadin/notification';
import { applyTheme } from 'Frontend/generated/theme';

@customElement('notification-primary')
export class Example extends LitElement {
  @state()
  private notificationOpened = false;

  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  handleClick() {
    // tag::snippet[]
    const notification = Notification.show('New project plan available', {
      position: 'middle',
    });
    notification.setAttribute('theme', 'primary');
    // end::snippet[]
    this.notificationOpened = true;
    const handleOpenChanged = (e: NotificationOpenedChangedEvent) => {
      if (!e.detail.value) {
        this.notificationOpened = false;
        notification.removeEventListener('opened-changed', handleOpenChanged);
      }
    };
    notification.addEventListener('opened-changed', handleOpenChanged);
  }

  protected override render() {
    return html`
      <vaadin-button @click="${this.handleClick}" .disabled="${this.notificationOpened}">
        Try it
      </vaadin-button>
    `;
  }
}
NotificationPrimary.javapackage com.vaadin.demo.component.notification;

import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.component.notification.NotificationVariant;
import com.vaadin.flow.router.Route;

@Route("notification-primary")
public class NotificationPrimary extends Div {

    public NotificationPrimary() {
        Button button = new Button("Try it");
        button.addClickListener(clickEvent -> {
            button.setEnabled(false);

            // tag::snippet[]
            Notification notification = Notification
                    .show("New project plan available");
            notification.addThemeVariants(NotificationVariant.LUMO_PRIMARY);
            // end::snippet[]
            notification.setPosition(Notification.Position.MIDDLE);

            notification
                    .addDetachListener(detachEvent -> button.setEnabled(true));
        });

        add(button);
    }

}

Contrast

A high-contrast version that improves legibility and distinguishes the notification from the rest of the UI.

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Source code

notification-contrast-preview.tsimport { html, LitElement } from 'lit';
import '@vaadin/notification';
import { applyTheme } from 'Frontend/generated/theme';

export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-notification-card theme="contrast" slot="middle">
        5 tasks deleted
      </vaadin-notification-card>
    `;
  }
}
notification-contrast-preview.ts

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Source code

notification-contrast.tsimport { html, LitElement } from 'lit';
import { customElement, state } from 'lit/decorators.js';
import '@vaadin/button';
import { Notification } from '@vaadin/notification';
import type { NotificationOpenedChangedEvent } from '@vaadin/notification';
import { applyTheme } from 'Frontend/generated/theme';

@customElement('notification-contrast')
export class Example extends LitElement {
  @state()
  private notificationOpened = false;

  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  handleClick() {
    // tag::snippet[]
    const notification = Notification.show('5 tasks deleted', {
      position: 'middle',
    });
    notification.setAttribute('theme', 'contrast');
    // end::snippet[]
    this.notificationOpened = true;
    const handleOpenChanged = (e: NotificationOpenedChangedEvent) => {
      if (!e.detail.value) {
        this.notificationOpened = false;
        notification.removeEventListener('opened-changed', handleOpenChanged);
      }
    };
    notification.addEventListener('opened-changed', handleOpenChanged);
  }

  protected override render() {
    return html`
      <vaadin-button @click="${this.handleClick}" .disabled="${this.notificationOpened}">
        Try it
      </vaadin-button>
    `;
  }
}
NotificationContrast.javapackage com.vaadin.demo.component.notification;

import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.component.notification.NotificationVariant;
import com.vaadin.flow.router.Route;

@Route("notification-contrast")
public class NotificationContrast extends Div {

    public NotificationContrast() {
        Button button = new Button("Try it");
        button.addClickListener(clickEvent -> {
            button.setEnabled(false);

            // tag::snippet[]
            Notification notification = Notification.show("5 tasks deleted");
            notification.addThemeVariants(NotificationVariant.LUMO_CONTRAST);
            // end::snippet[]
            notification.setPosition(Notification.Position.MIDDLE);

            notification
                    .addDetachListener(detachEvent -> button.setEnabled(true));
        });

        add(button);
    }

}

Duration

By default, notifications stay on-screen for 5 seconds. The duration is in milliseconds, and should be based on content and importance:

Use short durations for notifications that have:

short text content
lesser importance (for example, operations that finished without errors)
no interactive elements

Use longer durations for notifications that have:

longer text content
higher importance (for example, errors)
interactive elements (for example, links or "undo" actions)

A duration of at least 5 seconds is recommended to ensure that the user has a chance to see and understand the notification.

Persistent Notifications

Setting the duration to zero disables auto-closing, keeping the notification visible until explicitly dismissed by the user. This should be used for notifications that provide vital information to the user, such as errors. Persistent notifications should contain a Button that closes the notification and/or allows the user to take appropriate action.

Less-important notifications shouldn’t be persistent, and instead disappear automatically after an appropriate delay.

Position

Notifications can be positioned in the viewport in seven non-stretched positions, or stretched across the top or bottom:

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Use the position attribute in HTML templates, for example <vaadin-notification position="top-end"></vaadin-notification>.

Source code

notification-position.tsimport { html, LitElement } from 'lit';
import { customElement } from 'lit/decorators.js';
import '@vaadin/button';
import { Notification } from '@vaadin/notification';
import type { NotificationPosition } from '@vaadin/notification';
import { applyTheme } from 'Frontend/generated/theme';

@customElement('notification-position')
export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  constructor() {
    super();
    this.classList.add('notification-position-example');
  }

  // tag::snippet[]
  protected override render() {
    return html`
      <vaadin-button @click="${this.show}">top-stretch</vaadin-button>
      <vaadin-button @click="${this.show}">top-start</vaadin-button>
      <vaadin-button @click="${this.show}">top-center</vaadin-button>
      <vaadin-button @click="${this.show}">top-end</vaadin-button>
      <vaadin-button @click="${this.show}">middle</vaadin-button>
      <vaadin-button @click="${this.show}">bottom-start</vaadin-button>
      <vaadin-button @click="${this.show}">bottom-center</vaadin-button>
      <vaadin-button @click="${this.show}">bottom-end</vaadin-button>
      <vaadin-button @click="${this.show}">bottom-stretch</vaadin-button>
    `;
  }

  show(event: MouseEvent) {
    // Use the button label as the location
    const position = (event.target as HTMLElement).textContent as NotificationPosition;

    Notification.show(position, { position });
  }

  // end::snippet[]
}
notification-position-example.css.notification-position-example,
:host(.notification-position-example) {
  display: grid !important;
  grid-gap: 1em;
  grid-template-columns: 1fr 1fr 1fr;
}

.notification-position-example vaadin-button,
:host(.notification-position-example) vaadin-button {
  margin: 0;
  max-width: 100%;
}

.notification-position-example vaadin-button:nth-child(2),
.notification-position-example vaadin-button:nth-child(6),
:host(.notification-position-example) vaadin-button:nth-child(2),
:host(.notification-position-example) vaadin-button:nth-child(6) {
  margin-inline-end: auto;
}

.notification-position-example vaadin-button:nth-child(3),
.notification-position-example vaadin-button:nth-child(5),
.notification-position-example vaadin-button:nth-child(7),
:host(.notification-position-example) vaadin-button:nth-child(3),
:host(.notification-position-example) vaadin-button:nth-child(5),
:host(.notification-position-example) vaadin-button:nth-child(7) {
  margin: 0 auto;
}

.notification-position-example vaadin-button:nth-child(4),
.notification-position-example vaadin-button:nth-child(8),
:host(.notification-position-example) vaadin-button:nth-child(4),
:host(.notification-position-example) vaadin-button:nth-child(8) {
  margin-inline-start: auto;
}

.notification-position-example vaadin-button:nth-child(1),
.notification-position-example vaadin-button:nth-child(5),
.notification-position-example vaadin-button:nth-child(9),
:host(.notification-position-example) vaadin-button:nth-child(1),
:host(.notification-position-example) vaadin-button:nth-child(5),
:host(.notification-position-example) vaadin-button:nth-child(9) {
  grid-column-start: 1;
  grid-column-end: 4;
}
NotificationPosition.javapackage com.vaadin.demo.component.notification;

import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.component.notification.Notification.Position;
import com.vaadin.flow.router.Route;


@Route("notification-position")
public class NotificationPosition extends Div {

    public NotificationPosition() {
        setClassName("notification-position-example");

        // tag::snippet[]
        add(createButton(Position.TOP_STRETCH),
                createButton(Position.TOP_START),
                createButton(Position.TOP_CENTER),
                createButton(Position.TOP_END), createButton(Position.MIDDLE),
                createButton(Position.BOTTOM_START),
                createButton(Position.BOTTOM_CENTER),
                createButton(Position.BOTTOM_END),
                createButton(Position.BOTTOM_STRETCH));
        // end::snippet[]
    }

    private Button createButton(Notification.Position position) {
        Button button = new Button(position.getClientName());
        button.addClickListener(event -> show(position));
        return button;
    }

    private void show(Notification.Position position) {
        Notification.show(position.getClientName(), 5000, position);
    }

}
notification-position-example.css.notification-position-example,
:host(.notification-position-example) {
  display: grid !important;
  grid-gap: 1em;
  grid-template-columns: 1fr 1fr 1fr;
}

.notification-position-example vaadin-button,
:host(.notification-position-example) vaadin-button {
  margin: 0;
  max-width: 100%;
}

.notification-position-example vaadin-button:nth-child(2),
.notification-position-example vaadin-button:nth-child(6),
:host(.notification-position-example) vaadin-button:nth-child(2),
:host(.notification-position-example) vaadin-button:nth-child(6) {
  margin-inline-end: auto;
}

.notification-position-example vaadin-button:nth-child(3),
.notification-position-example vaadin-button:nth-child(5),
.notification-position-example vaadin-button:nth-child(7),
:host(.notification-position-example) vaadin-button:nth-child(3),
:host(.notification-position-example) vaadin-button:nth-child(5),
:host(.notification-position-example) vaadin-button:nth-child(7) {
  margin: 0 auto;
}

.notification-position-example vaadin-button:nth-child(4),
.notification-position-example vaadin-button:nth-child(8),
:host(.notification-position-example) vaadin-button:nth-child(4),
:host(.notification-position-example) vaadin-button:nth-child(8) {
  margin-inline-start: auto;
}

.notification-position-example vaadin-button:nth-child(1),
.notification-position-example vaadin-button:nth-child(5),
.notification-position-example vaadin-button:nth-child(9),
:host(.notification-position-example) vaadin-button:nth-child(1),
:host(.notification-position-example) vaadin-button:nth-child(5),
:host(.notification-position-example) vaadin-button:nth-child(9) {
  grid-column-start: 1;
  grid-column-end: 4;
}

Recommendations

Top End or Bottom Start are recommended for most notifications, as these are unobtrusive, but still noticeable.
Middle is the most disruptive position, and should be used only for important notifications, such as errors.
Bottom End is the least obtrusive position, but can go unnoticed.
Stretch notifications, which span the full width of the viewport, are more disruptive, and should be reserved for important notifications whose contents require more space.
Applications with a notification button or drop-down in the header or footer should position notifications to appear in the same part of the screen.
For a consistent user experience, use one or two positions throughout the application.
Avoid using positions that may obstruct important parts of the UI, such as navigation.

Note

The Flow styling issue

The Flow notification component renders rich content via an intermediate <flow-component-renderer> element. This can prevent notification content from using the full width when using top stretch or bottom stretch positioning. To work around this issue, add the following CSS rule to a global style sheet:

Source code

CSSvaadin-notification-card flow-component-renderer,
vaadin-notification-card flow-component-renderer > div {
  display: contents;
}

See Vaadin Flow Components issue 1876.

Stacking

Multiple simultaneously displayed notifications are stacked vertically, depending on their positioning:

When using the bottom half of the screen as the position, a new notification appears below the older notifications.
With the position set to the top half, a new notification appears above the existing notifications.

Size

The notification card is automatically sized based on its content.

In large viewports, the card’s maximum width is one-third of the viewport.
In small viewports, the card always takes up the entire width of the viewport.

Interactive Elements

Notifications can contain interactive content, such as Buttons or links that allow the user to perform related actions.

For example, if an operation fails, the error notification could offer the user the opportunity to try again. Or it could contain a link to a view that allows the user to resolve the problem.

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Source code

notification-retry-preview.tsimport { html, LitElement } from 'lit';
import '@vaadin/button';
import '@vaadin/horizontal-layout';
import '@vaadin/icon';
import '@vaadin/notification';
import '@vaadin/vaadin-lumo-styles/vaadin-iconset';
import { applyTheme } from 'Frontend/generated/theme';

export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-notification-card theme="error" slot="middle">
        <vaadin-horizontal-layout theme="spacing" style="align-items: center;">
          <div>Failed to generate report</div>
          <vaadin-button theme="tertiary-inline" style="margin-left: var(--lumo-space-xl);">
            Retry
          </vaadin-button>
          <vaadin-button theme="tertiary-inline" aria-label="Close">
            <vaadin-icon icon="lumo:cross"></vaadin-icon>
          </vaadin-button>
        </vaadin-horizontal-layout>
      </vaadin-notification-card>
    `;
  }
}
notification-retry-preview.ts

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Source code

notification-retry.tsimport { html, LitElement } from 'lit';
import { customElement, state } from 'lit/decorators.js';
import '@vaadin/button';
import '@vaadin/horizontal-layout';
import '@vaadin/icon';
import '@vaadin/notification';
import type { NotificationOpenedChangedEvent } from '@vaadin/notification';
import { notificationRenderer } from '@vaadin/notification/lit.js';
import type { NotificationLitRenderer } from '@vaadin/notification/lit.js';
import '@vaadin/vaadin-lumo-styles/vaadin-iconset';
import { applyTheme } from 'Frontend/generated/theme';

@customElement('notification-retry')
export class Example extends LitElement {
  @state()
  private notificationOpened = false;

  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-button .disabled="${this.notificationOpened}" @click="${this.open}">
        Try it
      </vaadin-button>

      <!-- tag::snippet[] -->
      <!-- The duration is set to 0-sec to prevent the notification from auto-close. -->
      <vaadin-notification
        theme="error"
        duration="0"
        position="middle"
        .opened="${this.notificationOpened}"
        @opened-changed="${(e: NotificationOpenedChangedEvent) => {
          this.notificationOpened = e.detail.value;
        }}"
        ${notificationRenderer(this.renderer, [])}
      ></vaadin-notification>
      <!-- end::snippet[] -->
    `;
  }

  renderer: NotificationLitRenderer = () => html`
    <vaadin-horizontal-layout theme="spacing" style="align-items: center;">
      <div>Failed to generate report</div>
      <vaadin-button
        theme="tertiary-inline"
        style="margin-left: var(--lumo-space-xl);"
        @click="${this.close}"
      >
        Retry
      </vaadin-button>
      <vaadin-button theme="tertiary-inline icon" @click="${this.close}" aria-label="Close">
        <vaadin-icon icon="lumo:cross"></vaadin-icon>
      </vaadin-button>
    </vaadin-horizontal-layout>
  `;

  private open() {
    this.notificationOpened = true;
  }

  private close() {
    this.notificationOpened = false;
  }
}
NotificationRetry.javapackage com.vaadin.demo.component.notification;

import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.Text;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.button.ButtonVariant;
import com.vaadin.flow.component.icon.Icon;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.component.notification.NotificationVariant;
import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
import com.vaadin.flow.component.orderedlayout.FlexComponent.Alignment;
import com.vaadin.flow.router.Route;


@Route("notification-retry")
public class NotificationRetry extends Div {

    public NotificationRetry() {
        Button button = new Button("Try it");
        button.addClickListener(clickEvent -> {
            button.setEnabled(false);

            Notification notification = show();
            notification
                    .addDetachListener(detachEvent -> button.setEnabled(true));
        });

        add(button);
    }

    private Notification show() {
        // tag::snippet[]
        // When creating a notification using the constructor,
        // the duration is 0-sec by default which means that
        // the notification does not close automatically.
        Notification notification = new Notification();
        notification.addThemeVariants(NotificationVariant.LUMO_ERROR);

        Div statusText = new Div(new Text("Failed to generate report"));

        Button retryButton = new Button("Retry");
        retryButton.addThemeVariants(ButtonVariant.LUMO_TERTIARY_INLINE);
        retryButton.getElement().getStyle().set("margin-left",
                "var(--lumo-space-xl)");
        retryButton.addClickListener(event -> {
            notification.close();
        });

        Button closeButton = new Button(new Icon("lumo", "cross"));
        closeButton.addThemeVariants(ButtonVariant.LUMO_TERTIARY_INLINE);
        closeButton.getElement().setAttribute("aria-label", "Close");
        closeButton.addClickListener(event -> {
            notification.close();
        });

        HorizontalLayout layout = new HorizontalLayout(statusText, retryButton,
                closeButton);
        layout.setAlignItems(Alignment.CENTER);

        notification.add(layout);
        notification.open();
        // end::snippet[]

        notification.setPosition(Notification.Position.MIDDLE);

        return notification;
    }

}

In situations where the user might want to revert an action, display an "undo" button.

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Source code

notification-undo-preview.tsimport { html, LitElement } from 'lit';
import '@vaadin/button';
import '@vaadin/horizontal-layout';
import '@vaadin/icon';
import '@vaadin/notification';
import '@vaadin/vaadin-lumo-styles/vaadin-iconset';
import { applyTheme } from 'Frontend/generated/theme';

export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-notification-card theme="contrast" slot="middle">
        <vaadin-horizontal-layout theme="spacing" style="align-items: center;">
          <div>5 tasks deleted</div>
          <vaadin-button theme="tertiary-inline" style="margin-left: var(--lumo-space-xl);">
            Undo
          </vaadin-button>
          <vaadin-button theme="tertiary-inline" aria-label="Close">
            <vaadin-icon icon="lumo:cross"></vaadin-icon>
          </vaadin-button>
        </vaadin-horizontal-layout>
      </vaadin-notification-card>
    `;
  }
}
notification-undo-preview.ts

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Source code

notification-undo.tsimport { html, LitElement } from 'lit';
import { customElement, state } from 'lit/decorators.js';
import '@vaadin/button';
import '@vaadin/horizontal-layout';
import '@vaadin/icon';
import '@vaadin/notification';
import type { NotificationOpenedChangedEvent } from '@vaadin/notification';
import { notificationRenderer } from '@vaadin/notification/lit.js';
import type { NotificationLitRenderer } from '@vaadin/notification/lit.js';
import '@vaadin/vaadin-lumo-styles/vaadin-iconset';
import { applyTheme } from 'Frontend/generated/theme';

@customElement('notification-undo')
export class Example extends LitElement {
  @state()
  private notificationOpened = false;

  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-button .disabled="${this.notificationOpened}" @click="${this.open}">
        Try it
      </vaadin-button>

      <!-- tag::snippet[] -->
      <vaadin-notification
        theme="contrast"
        duration="10000"
        position="middle"
        .opened="${this.notificationOpened}"
        @opened-changed="${(e: NotificationOpenedChangedEvent) => {
          this.notificationOpened = e.detail.value;
        }}"
        ${notificationRenderer(this.renderer, [])}
      ></vaadin-notification>
      <!-- end::snippet[] -->
    `;
  }

  renderer: NotificationLitRenderer = () => html`
    <vaadin-horizontal-layout theme="spacing" style="align-items: center;">
      <div>5 tasks deleted</div>
      <vaadin-button
        theme="tertiary-inline"
        style="margin-left: var(--lumo-space-xl);"
        @click="${this.close}"
      >
        Undo
      </vaadin-button>
      <vaadin-button theme="tertiary-inline" aria-label="Close" @click="${this.close}">
        <vaadin-icon icon="lumo:cross"></vaadin-icon>
      </vaadin-button>
    </vaadin-horizontal-layout>
  `;

  private open() {
    this.notificationOpened = true;
  }

  private close() {
    this.notificationOpened = false;
  }
}
NotificationUndo.javapackage com.vaadin.demo.component.notification;

import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.Text;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.button.ButtonVariant;
import com.vaadin.flow.component.icon.Icon;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.component.notification.NotificationVariant;
import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
import com.vaadin.flow.component.orderedlayout.FlexComponent.Alignment;
import com.vaadin.flow.router.Route;


@Route("notification-undo")
public class NotificationUndo extends Div {

    public NotificationUndo() {
        Button button = new Button("Try it");
        button.addClickListener(clickEvent -> {
            button.setEnabled(false);

            Notification notification = show();
            notification
                    .addDetachListener(detachEvent -> button.setEnabled(true));
        });

        add(button);
    }

    public Notification show() {
        // tag::snippet[]
        Notification notification = new Notification();
        notification.setDuration(10000);
        notification.addThemeVariants(NotificationVariant.LUMO_CONTRAST);

        Div statusText = new Div(new Text("5 tasks deleted"));

        Button undoButton = new Button("Undo");
        undoButton.addThemeVariants(ButtonVariant.LUMO_TERTIARY_INLINE);
        undoButton.getElement().getStyle().set("margin-left",
                "var(--lumo-space-xl)");
        undoButton.addClickListener(event -> {
            notification.close();
        });

        Button closeButton = new Button(new Icon("lumo", "cross"));
        closeButton.addThemeVariants(ButtonVariant.LUMO_TERTIARY_INLINE);
        closeButton.getElement().setAttribute("aria-label", "Close");
        closeButton.addClickListener(event -> {
            notification.close();
        });

        HorizontalLayout layout = new HorizontalLayout(statusText, undoButton,
                closeButton);
        layout.setAlignItems(Alignment.CENTER);

        notification.add(layout);
        notification.open();
        // end::snippet[]

        notification.setPosition(Notification.Position.MIDDLE);

        return notification;
    }

}

Notifications can also contain links to relevant information.

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Source code

notification-link-preview.tsimport { html, LitElement } from 'lit';
import '@vaadin/button';
import '@vaadin/horizontal-layout';
import '@vaadin/icon';
import '@vaadin/notification';
import '@vaadin/vaadin-lumo-styles/vaadin-iconset';
import { applyTheme } from 'Frontend/generated/theme';

export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-notification-card slot="middle">
        <vaadin-horizontal-layout theme="spacing" style="align-items: center;">
          <div>Jason Bailey mentioned you in <a href="#">Project Q4</a></div>
          <vaadin-button theme="tertiary-inline">
            <vaadin-icon icon="lumo:cross"></vaadin-icon>
          </vaadin-button>
        </vaadin-horizontal-layout>
      </vaadin-notification-card>
    `;
  }
}
notification-link-preview.ts

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Source code

notification-link.tsimport { html, LitElement } from 'lit';
import { customElement, state } from 'lit/decorators.js';
import '@vaadin/button';
import '@vaadin/horizontal-layout';
import '@vaadin/icon';
import '@vaadin/notification';
import type { NotificationOpenedChangedEvent } from '@vaadin/notification';
import { notificationRenderer } from '@vaadin/notification/lit.js';
import type { NotificationLitRenderer } from '@vaadin/notification/lit.js';
import '@vaadin/vaadin-lumo-styles/vaadin-iconset';
import { applyTheme } from 'Frontend/generated/theme';

@customElement('notification-link')
export class Example extends LitElement {
  @state()
  private notificationOpened = false;

  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-button .disabled="${this.notificationOpened}" @click="${this.open}">
        Try it
      </vaadin-button>

      <!-- tag::snippet[] -->
      <!-- The duration is set to 0-sec to prevent the notification from auto-close. -->
      <vaadin-notification
        duration="0"
        position="middle"
        .opened="${this.notificationOpened}"
        @opened-changed="${(e: NotificationOpenedChangedEvent) => {
          this.notificationOpened = e.detail.value;
        }}"
        ${notificationRenderer(this.renderer, [])}
      ></vaadin-notification>
      <!-- end::snippet[] -->
    `;
  }

  renderer: NotificationLitRenderer = () => html`
    <vaadin-horizontal-layout theme="spacing" style="align-items: center;">
      <div>Jason Bailey mentioned you in <a href="#">Project Q4</a></div>
      <vaadin-button theme="tertiary-inline" aria-label="Close" @click="${this.close}">
        <vaadin-icon icon="lumo:cross"></vaadin-icon>
      </vaadin-button>
    </vaadin-horizontal-layout>
  `;


  private open() {
    this.notificationOpened = true;
  }

  private close() {
    this.notificationOpened = false;
  }
}
NotificationLink.javapackage com.vaadin.demo.component.notification;

import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.html.Anchor;
import com.vaadin.flow.component.Text;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.button.ButtonVariant;
import com.vaadin.flow.component.icon.Icon;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
import com.vaadin.flow.component.orderedlayout.FlexComponent.Alignment;
import com.vaadin.flow.router.Route;

@Route("notification-link")
public class NotificationLink extends Div {

    public NotificationLink() {
        Button button = new Button("Try it");
        button.addClickListener(clickEvent -> {
            button.setEnabled(false);

            Notification notification = show();
            notification
                    .addDetachListener(detachEvent -> button.setEnabled(true));
        });

        add(button);
    }

    public Notification show() {
        // tag::snippet[]
        // When creating a notification using the constructor,
        // the duration is 0-sec by default which means that
        // the notification does not close automatically.
        Notification notification = new Notification();

        Div text = new Div(new Text("Jason Bailey mentioned you in "),
                new Anchor("#", "Project Q4"));

        Button closeButton = new Button(new Icon("lumo", "cross"));
        closeButton.addThemeVariants(ButtonVariant.LUMO_TERTIARY_INLINE);
        closeButton.getElement().setAttribute("aria-label", "Close");
        closeButton.addClickListener(event -> {
            notification.close();
        });

        HorizontalLayout layout = new HorizontalLayout(text, closeButton);
        layout.setAlignItems(Alignment.CENTER);

        notification.add(layout);
        notification.open();
        // end::snippet[]

        notification.setPosition(Notification.Position.MIDDLE);

        return notification;
    }

}

Making Interactive Elements Keyboard-Accessible

Take care to ensure that keyboard-only users can access interactive elements in notifications:

Make the notification persistent, to prevent it from disappearing before the user has had a chance to interact with it.
Provide a keyboard shortcut, either to trigger the action itself, or to move focus to the notification card in cases where multiple interactive elements are present.
Make the shortcut discoverable, for example by displaying it as part of the notification’s content.

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Source code

notification-keyboard-a11y-preview.tsimport { html, LitElement } from 'lit';
import '@vaadin/button';
import '@vaadin/horizontal-layout';
import '@vaadin/notification';
import { applyTheme } from 'Frontend/generated/theme';

const isMac = /Macintosh|MacIntel|MacPPC|Mac68K/.test(window.navigator.platform);

export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-notification-card theme="contrast" slot="middle">
        <vaadin-horizontal-layout style="align-items: center;">
          <div>5 tasks deleted</div>
          <vaadin-button theme="primary" style="margin-left: var(--lumo-space-xl);">
            Undo ${isMac ? '⌘' : 'Ctrl-'}Z
          </vaadin-button>
        </vaadin-horizontal-layout>
      </vaadin-notification-card>
    `;
  }
}
notification-keyboard-a11y-preview.ts

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Source code

notification-keyboard-a11y.tsimport { html, LitElement } from 'lit';
import { customElement, state } from 'lit/decorators.js';
import '@vaadin/button';
import '@vaadin/horizontal-layout';
import '@vaadin/notification';
import type { NotificationOpenedChangedEvent } from '@vaadin/notification';
import { notificationRenderer } from '@vaadin/notification/lit.js';
import type { NotificationLitRenderer } from '@vaadin/notification/lit.js';
import { applyTheme } from 'Frontend/generated/theme';

@customElement('notification-keyboard-a11y')
export class Example extends LitElement {
  @state()
  private notificationOpened = false;

  @state()
  private isMac = /Macintosh|MacIntel|MacPPC|Mac68K/.test(window.navigator.platform);

  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  // tag::snippet[]
  protected override render() {
    return html`
      <!-- end::snippet[] -->
      <vaadin-button .disabled="${this.notificationOpened}" @click="${this.open}">
        Try it
      </vaadin-button>

      <!-- tag::snippet[] -->
      <vaadin-notification
        theme="contrast"
        duration="10000"
        position="middle"
        .opened="${this.notificationOpened}"
        @opened-changed="${(e: NotificationOpenedChangedEvent) => {
          this.notificationOpened = e.detail.value;
        }}"
        ${notificationRenderer(this.renderer, [])}
      ></vaadin-notification>
    `;
  }

  // end::snippet[]

  // tag::renderer[]
  renderer: NotificationLitRenderer = () => html`
    <vaadin-horizontal-layout style="align-items: center;">
      <div>5 tasks deleted</div>
      <vaadin-button
        style="margin-left: var(--lumo-space-xl);"
        theme="primary"
        @click="${this.close}"
      >
        Undo
        <!-- Ideally, this should be hidden if the
                 device does not have a physical keyboard -->
        ${this.isMac ? '⌘' : 'Ctrl-'}Z
      </vaadin-button>
    </vaadin-horizontal-layout>
  `;

  // end::renderer[]

  // tag::key-down[]
  connectedCallback() {
    super.connectedCallback();

    document.addEventListener('keydown', this.onKeyDown);
  }

  disconnectedCallback() {
    super.disconnectedCallback();

    document.removeEventListener('keydown', this.onKeyDown);
  }

  onKeyDown = (event: KeyboardEvent) => {
    if (this.notificationOpened && (event.metaKey || event.ctrlKey) && event.key === 'z') {
      // Handle your custom undo logic here
      // Avoid triggering the native undo action
      event.preventDefault();
      this.close();
    }
  };
  // end::key-down[]

  private open() {
    this.notificationOpened = true;
  }

  private close() {
    this.notificationOpened = false;
  }
}
NotificationKeyboardA11y.javapackage com.vaadin.demo.component.notification;

import com.vaadin.flow.component.*;
import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.button.ButtonVariant;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.component.notification.NotificationVariant;
import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
import com.vaadin.flow.component.orderedlayout.FlexComponent.Alignment;
import com.vaadin.flow.router.Route;


@Route("notification-keyboard-a11y")
public class NotificationKeyboardA11y extends Div {

    public NotificationKeyboardA11y() {
        Button button = new Button("Try it");
        button.addClickListener(clickEvent -> {
            button.setEnabled(false);

            Notification notification = show();
            notification
                    .addDetachListener(detachEvent -> button.setEnabled(true));
            setupUndoShortcut(notification);
        });

        add(button);
    }

    // tag::snippet[]
    public Notification show() {
        Notification notification = new Notification();
        notification.setDuration(10000);
        notification.addThemeVariants(NotificationVariant.LUMO_CONTRAST);

        Div statusText = new Div(new Text("5 tasks deleted"));

        Button undoButton = new Button();
        undoButton.addThemeVariants(ButtonVariant.LUMO_PRIMARY);
        undoButton.getElement().getStyle().set("margin-left",
                "var(--lumo-space-xl)");
        undoButton.getElement().executeJs(
                "const isMac = /Macintosh|MacIntel|MacPPC|Mac68K/.test(window.navigator.platform);"
                        + "this.textContent = `Undo ${isMac ? '⌘' : 'Ctrl-'}Z`;");
        undoButton.addClickListener(event -> {
            notification.close();
        });

        HorizontalLayout layout = new HorizontalLayout(statusText, undoButton);
        layout.setAlignItems(Alignment.CENTER);

        notification.add(layout);
        notification.open();
        // end::snippet[]

        notification.setPosition(Notification.Position.MIDDLE);
        // tag::snippet[]

        return notification;
    }
    // end::snippet[]

    public void setupUndoShortcut(Notification notification) {
        Shortcuts.addShortcutListener(notification, notification::close,
                Key.of("z"), KeyModifier.META);
        Shortcuts.addShortcutListener(notification, notification::close,
                Key.of("z"), KeyModifier.CONTROL);
    }

}

Icons and Other Rich Formatting

Icons and other content formatting can be used to provide information and helpful visual cues, for example to make errors and success notifications easier to distinguish for users with color blindness.

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Source code

notification-rich-preview.tsimport { html, LitElement } from 'lit';
import { customElement } from 'lit/decorators.js';
import '@vaadin/avatar';
import '@vaadin/button';
import '@vaadin/icon';
import '@vaadin/icons';
import '@vaadin/notification';
import '@vaadin/vaadin-lumo-styles/vaadin-iconset';
import { applyTheme } from 'Frontend/generated/theme';

@customElement('notification-rich-preview')
export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-notification-card theme="success" slot="middle">
        <vaadin-horizontal-layout theme="spacing" style="align-items: center">
          <vaadin-icon icon="vaadin:check-circle"></vaadin-icon>
          <div>Application submitted!</div>
          <vaadin-button style="margin: 0 0 0 var(--lumo-space-l)">View</vaadin-button>
          <vaadin-button theme="tertiary-inline">
            <vaadin-icon icon="lumo:cross"></vaadin-icon>
          </vaadin-button>
        </vaadin-horizontal-layout>
      </vaadin-notification-card>

      <vaadin-notification-card theme="error" slot="middle">
        <vaadin-horizontal-layout theme="spacing" style="align-items: center">
          <vaadin-icon icon="vaadin:warning"></vaadin-icon>
          <div>Failed to generate report</div>
          <vaadin-button style="margin: 0 0 0 var(--lumo-space-l)">Retry</vaadin-button>
          <vaadin-button theme="tertiary-inline">
            <vaadin-icon icon="lumo:cross"></vaadin-icon>
          </vaadin-button>
        </vaadin-horizontal-layout>
      </vaadin-notification-card>

      <vaadin-notification-card slot="middle">
        <vaadin-horizontal-layout theme="spacing" style="align-items: center">
          <vaadin-avatar name="Jason Bailey"></vaadin-avatar>
          <div><b>Jason Bailey</b> mentioned you in <a href="#">Project Q4</a></div>
          <vaadin-button theme="tertiary-inline">
            <vaadin-icon icon="lumo:cross"></vaadin-icon>
          </vaadin-button>
        </vaadin-horizontal-layout>
      </vaadin-notification-card>

      <vaadin-notification-card slot="middle">
        <vaadin-horizontal-layout theme="spacing" style="align-items: center">
          <vaadin-icon
            icon="vaadin:check-circle"
            style="color: var(--lumo-success-color)"
          ></vaadin-icon>
          <div>
            <b style="color: var(--lumo-success-text-color);">Upload successful</b>
            <div
              style="font-size: var(--lumo-font-size-s); color: var(--lumo-secondary-text-color);"
            >
              <b>Financials.xlsx</b> is now available in <a href="#">Documents</a>
            </div>
          </div>
          <vaadin-button theme="tertiary-inline">
            <vaadin-icon icon="lumo:cross"></vaadin-icon>
          </vaadin-button>
        </vaadin-horizontal-layout>
      </vaadin-notification-card>
    `;
  }
}
notification-rich-preview.ts

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Source code

notification-rich.tsimport { html, LitElement } from 'lit';
import { customElement } from 'lit/decorators.js';
import '@vaadin/avatar';
import '@vaadin/button';
import '@vaadin/horizontal-layout';
import '@vaadin/icon';
import '@vaadin/icons';
import '@vaadin/notification';
import { notificationRenderer } from '@vaadin/notification/lit.js';
import type { Notification } from '@vaadin/notification';
import '@vaadin/vaadin-lumo-styles/vaadin-iconset';
import { applyTheme } from 'Frontend/generated/theme';

@customElement('notification-rich')
export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <!-- tag::snippet[] -->
      <vaadin-notification
        ${notificationRenderer(
          (notification) => html`
            <vaadin-horizontal-layout theme="spacing" style="align-items: center">
              <vaadin-icon icon="vaadin:check-circle"></vaadin-icon>
              <div>Application submitted!</div>
              <vaadin-button
                style="margin: 0 0 0 var(--lumo-space-l)"
                @click="${() => notification.close()}"
              >
                View
              </vaadin-button>
              <vaadin-button
                theme="tertiary-inline"
                @click="${() => notification.close()}"
                aria-label="Close"
              >
                <vaadin-icon icon="lumo:cross"></vaadin-icon>
              </vaadin-button>
            </vaadin-horizontal-layout>
          `,
          []
        )}
        theme="success"
        position="middle"
      ></vaadin-notification>

      <vaadin-notification
        ${notificationRenderer(
          (notification) => html`
            <vaadin-horizontal-layout theme="spacing" style="align-items: center">
              <vaadin-icon icon="vaadin:warning"></vaadin-icon>
              <div>Failed to generate report</div>
              <vaadin-button
                style="margin: 0 0 0 var(--lumo-space-l)"
                @click="${() => notification.close()}"
              >
                Retry
              </vaadin-button>
              <vaadin-button
                theme="tertiary-inline"
                @click="${() => notification.close()}"
                aria-label="Close"
              >
                <vaadin-icon icon="lumo:cross"></vaadin-icon>
              </vaadin-button>
            </vaadin-horizontal-layout>
          `,
          []
        )}
        theme="error"
        position="middle"
      ></vaadin-notification>

      <vaadin-notification
        ${notificationRenderer(
          (notification) => html`
            <vaadin-horizontal-layout theme="spacing" style="align-items: center">
              <vaadin-avatar name="Jason Bailey"></vaadin-avatar>
              <div><b>Jason Bailey</b> mentioned you in <a href="#">Project Q4</a></div>
              <vaadin-button
                theme="tertiary-inline"
                @click="${() => notification.close()}"
                aria-label="Close"
              >
                <vaadin-icon icon="lumo:cross"></vaadin-icon>
              </vaadin-button>
            </vaadin-horizontal-layout>
          `,
          []
        )}
        position="middle"
      ></vaadin-notification>

      <vaadin-notification
        ${notificationRenderer(
          (notification) => html`
            <vaadin-horizontal-layout theme="spacing" style="align-items: center">
              <vaadin-icon
                icon="vaadin:check-circle"
                style="color: var(--lumo-success-color)"
              ></vaadin-icon>
              <div>
                <b style="color: var(--lumo-success-text-color);">Upload successful</b>
                <div
                  style="font-size: var(--lumo-font-size-s); color: var(--lumo-secondary-text-color)"
                >
                  <b>Financials.xlsx</b> is now available in <a href="#">Documents</a>
                </div>
              </div>
              <vaadin-button
                theme="tertiary-inline"
                @click="${() => notification.close()}"
                aria-label="Close"
              >
                <vaadin-icon icon="lumo:cross"></vaadin-icon>
              </vaadin-button>
            </vaadin-horizontal-layout>
          `,
          []
        )}
        position="middle"
      ></vaadin-notification>
      <!-- end::snippet[] -->
      <vaadin-horizontal-layout theme="spacing" style="justify-content: center">
        <vaadin-button @click="${this.open}" data-which="1" theme="success primary">
          Try it
        </vaadin-button>
        <vaadin-button @click="${this.open}" data-which="2" theme="error primary">
          Try it
        </vaadin-button>
        <vaadin-button @click="${this.open}" data-which="3" theme="contrast">Try it</vaadin-button>
        <vaadin-button @click="${this.open}" data-which="4" theme="success">Try it</vaadin-button>
      </vaadin-horizontal-layout>
    `;
  }

  open(event: MouseEvent) {
    const target = event.target as HTMLElement;
    const notification = this.renderRoot.querySelector<Notification>(
      `vaadin-notification:nth-child(${target.dataset.which})`
    );
    notification?.open();
  }
}
NotificationRich.javapackage com.vaadin.demo.component.notification;

import com.vaadin.flow.component.ClickEvent;
import com.vaadin.flow.component.ComponentEventListener;
import com.vaadin.flow.component.Text;
import com.vaadin.flow.component.avatar.Avatar;
import com.vaadin.flow.component.html.Anchor;
import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.html.Span;
import com.vaadin.flow.component.icon.Icon;
import com.vaadin.flow.component.icon.VaadinIcon;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.component.notification.NotificationVariant;
import com.vaadin.flow.component.orderedlayout.FlexComponent;
import com.vaadin.flow.component.orderedlayout.HorizontalLayout;
import com.vaadin.flow.router.Route;

import java.util.function.Supplier;

import static com.vaadin.flow.component.button.ButtonVariant.*;

@Route("notification-rich")
public class NotificationRich extends HorizontalLayout {
    public static ComponentEventListener<ClickEvent<Button>> createClickHandler(
            Supplier<Notification> notificationSupplier) {
        return clickEvent -> {
            Button btn = clickEvent.getSource();
            btn.setEnabled(false);

            Notification notification = notificationSupplier.get();
            notification.setPosition(Notification.Position.MIDDLE);
            notification.setDuration(5000);
            notification.open();
            notification.addDetachListener(detachEvent -> btn.setEnabled(true));
        };
    }

    public NotificationRich() {
        Button successBtn = new Button("Try it",
                createClickHandler(NotificationRich::createSubmitSuccess));
        successBtn.addThemeVariants(LUMO_SUCCESS, LUMO_PRIMARY);

        Button errorBtn = new Button("Try it",
                createClickHandler(NotificationRich::createReportError));
        errorBtn.addThemeVariants(LUMO_ERROR, LUMO_PRIMARY);

        Button mentionBtn = new Button("Try it", createClickHandler(
                NotificationRich::createMentionNotification));
        mentionBtn.addThemeVariants(LUMO_CONTRAST);

        Button uploadSuccessBtn = new Button("Try it",
                createClickHandler(NotificationRich::createUploadSuccess));
        uploadSuccessBtn.addThemeVariants(LUMO_SUCCESS);

        setJustifyContentMode(JustifyContentMode.CENTER);
        add(successBtn, errorBtn, mentionBtn, uploadSuccessBtn);
    }

    // tag::snippet[]
    public static Notification createSubmitSuccess() {
        Notification notification = new Notification();
        notification.addThemeVariants(NotificationVariant.LUMO_SUCCESS);

        Icon icon = VaadinIcon.CHECK_CIRCLE.create();
        Div info = new Div(new Text("Application submitted!"));

        Button viewBtn = new Button("View", clickEvent -> notification.close());
        viewBtn.getStyle().set("margin", "0 0 0 var(--lumo-space-l)");

        HorizontalLayout layout = new HorizontalLayout(icon, info, viewBtn,
                createCloseBtn(notification));
        layout.setAlignItems(FlexComponent.Alignment.CENTER);

        notification.add(layout);

        return notification;
    }

    public static Notification createReportError() {
        Notification notification = new Notification();
        notification.addThemeVariants(NotificationVariant.LUMO_ERROR);

        Icon icon = VaadinIcon.WARNING.create();
        Div info = new Div(new Text("Failed to generate report!"));

        Button retryBtn = new Button("Retry",
                clickEvent -> notification.close());
        retryBtn.getStyle().set("margin", "0 0 0 var(--lumo-space-l)");

        HorizontalLayout layout = new HorizontalLayout(icon, info, retryBtn,
                createCloseBtn(notification));
        layout.setAlignItems(FlexComponent.Alignment.CENTER);

        notification.add(layout);

        return notification;
    }

    public static Notification createMentionNotification() {
        Notification notification = new Notification();

        Avatar avatar = new Avatar("Jason Bailey");

        Span name = new Span("Jason Bailey");
        name.getStyle().set("font-weight", "500");

        Div info = new Div(name, new Text(" mentioned you in "),
                new Anchor("#", "Project Q4"));

        HorizontalLayout layout = new HorizontalLayout(avatar, info,
                createCloseBtn(notification));
        layout.setAlignItems(FlexComponent.Alignment.CENTER);

        notification.add(layout);

        return notification;
    }

    public static Notification createUploadSuccess() {
        Notification notification = new Notification();

        Icon icon = VaadinIcon.CHECK_CIRCLE.create();
        icon.setColor("var(--lumo-success-color)");

        Div uploadSuccessful = new Div(new Text("Upload successful"));
        uploadSuccessful.getStyle().set("font-weight", "600").set("color",
                "var(--lumo-success-text-color)");

        Span fileName = new Span("Financials.xlsx");
        fileName.getStyle().set("font-size", "var(--lumo-font-size-s)")
                .set("font-weight", "600");

        Div info = new Div(uploadSuccessful,
                new Div(fileName, new Text(" is now available in "),
                        new Anchor("#", "Documents")));
        info.getStyle().set("font-size", "var(--lumo-font-size-s)").set("color",
                "var(--lumo-secondary-text-color)");

        HorizontalLayout layout = new HorizontalLayout(icon, info,
                createCloseBtn(notification));
        layout.setAlignItems(FlexComponent.Alignment.CENTER);

        notification.add(layout);

        return notification;
    }

    public static Button createCloseBtn(Notification notification) {
        Button closeBtn = new Button(VaadinIcon.CLOSE_SMALL.create(),
                clickEvent -> notification.close());
        closeBtn.addThemeVariants(LUMO_TERTIARY_INLINE);

        return closeBtn;
    }
    // end::snippet[]

}

Static Helper

For simple, one-off notifications, it’s convenient to use the static show() helper method. The helper manages the notification’s lifecycle, and adds and removes it from the DOM automatically.

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Source code

notification-static-helper.tsimport { html, LitElement } from 'lit';
import { customElement } from 'lit/decorators.js';
import '@vaadin/button';
import { Notification } from '@vaadin/notification';
import { applyTheme } from 'Frontend/generated/theme';

@customElement('notification-static-helper')
export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  handleTextNotification() {
    // tag::snippet[]
    // Show a simple text-based notification
    Notification.show('Financial report generated', {
      position: 'middle',
    });
    // end::snippet[]
  }

  handleLitTemplateNotification() {
    // tag::snippet[]
    // Show a notification with markup using a Lit template
    Notification.show(
      html`
        <b>@John:</b>
        &nbsp;
        <span>
          How about lunch at
          <span style="color: var(--lumo-primary-text-color)">12:30pm</span>?
        </span>
      `,
      {
        position: 'middle',
      }
    );
    // end::snippet[]
  }

  protected override render() {
    return html`
      <vaadin-button @click="${this.handleTextNotification}">
        Show text notification
      </vaadin-button>
      <vaadin-button @click="${this.handleLitTemplateNotification}">
        Show notification with markup
      </vaadin-button>
    `;
  }
}
NotificationStaticHelper.javapackage com.vaadin.demo.component.notification;

import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.router.Route;

@Route("notification-static-helper")
public class NotificationStaticHelper extends Div {

    public NotificationStaticHelper() {
        Button button = new Button("Show text notification");
        button.addClickListener(clickEvent -> {
            // tag::snippet[]
            // Show a simple text-based notification
            Notification notification = Notification
                    .show("Financial report generated");
            notification.setPosition(Notification.Position.MIDDLE);
            // end::snippet[]
        });

        add(button);
    }

}

Best Practices

Use Sparingly

Notifications are disruptive by design and should be used sparingly. Use fewer notifications by reserving them for more-important information that might otherwise go unnoticed by the user.

Less-urgent notifications can be provided through a link or drop-down in the application header or footer, instead of via immediate notifications.

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Source code

notification-popup.ts
import { css, html, LitElement } from 'lit';
import { customElement } from 'lit/decorators.js';
import '@vaadin/button';
import '@vaadin/context-menu';
import { contextMenuRenderer } from '@vaadin/context-menu/lit.js';
import '@vaadin/icon';
import { badge } from '@vaadin/vaadin-lumo-styles/badge.js';
import '@vaadin/vaadin-lumo-styles/vaadin-iconset';
import { applyTheme } from 'Frontend/generated/theme';

@customElement('notification-popup')
export class Example2 extends LitElement {
  static override styles = [
    badge,
    css`
      vaadin-context-menu {
        /* Wrap the click target around the button */
        display: inline-block;
      }

      span[theme~='badge'] {
        position: absolute;
        transform: translate(-40%, -30%);
      }
    `,
  ];

  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  // tag::snippet[]
  protected override render() {
    return html`
      <vaadin-context-menu
        open-on="click"
        ${contextMenuRenderer(
          () => html`<div style="padding: var(--lumo-space-l);">Show notifications here</div>`,
          []
        )}
      >
        <vaadin-button aria-label="notifications" theme="tertiary">
          <vaadin-icon icon="vaadin:bell-o"></vaadin-icon>
          <span theme="badge error primary small pill">4</span>
        </vaadin-button>
      </vaadin-context-menu>
    `;
  }
  // end::snippet[]
}
NotificationPopup.javapackage com.vaadin.demo.component.notification;

import com.vaadin.flow.component.Text;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.button.ButtonVariant;
import com.vaadin.flow.component.contextmenu.ContextMenu;
import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.html.Span;
import com.vaadin.flow.component.icon.VaadinIcon;
import com.vaadin.flow.router.Route;

import java.util.Arrays;

@Route("notification-popup")
public class NotificationPopup extends Div {

    public NotificationPopup() {
        // tag::snippet[]
        Span numberOfNotifications = new Span("4");
        numberOfNotifications.getElement().getThemeList().addAll(
                Arrays.asList("badge", "error", "primary", "small", "pill"));
        numberOfNotifications.getStyle().set("position", "absolute")
                .set("transform", "translate(-40%, -85%)");

        Button bellBtn = new Button(VaadinIcon.BELL_O.create());
        bellBtn.addThemeVariants(ButtonVariant.LUMO_TERTIARY);
        bellBtn.getElement().appendChild(numberOfNotifications.getElement());

        Div sampleNotification = new Div(new Text("Show notifications here"));
        sampleNotification.getStyle().set("padding", "var(--lumo-space-l)");

        ContextMenu menu = new ContextMenu();
        menu.setOpenOnClick(true);
        menu.setTarget(bellBtn);
        menu.add(sampleNotification);
        // end::snippet[]

        add(bellBtn);
    }

}

Limit Content Length

Aim for one or two lines of content. Notifications should be brief and to the point. More information can be provided through an embedded link or Button.

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Do show a preview of longer content, and link to the full details

Source code

notification-content-length-do.tsimport { html, LitElement } from 'lit';
import '@vaadin/button';
import '@vaadin/icon';
import '@vaadin/notification';
import '@vaadin/vaadin-lumo-styles/vaadin-iconset';
import { applyTheme } from 'Frontend/generated/theme';

export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-notification-card slot="middle">
        <div>
          <div>Aria Bailey</div>
          <div style="font-size: var(--lumo-font-size-s); color: var(--lumo-secondary-text-color);">
            Yeah, I know. But could you help me with...
          </div>
        </div>
        <vaadin-button>View</vaadin-button>
        <vaadin-button theme="tertiary-inline">
          <vaadin-icon icon="lumo:cross"></vaadin-icon>
        </vaadin-button>
      </vaadin-notification-card>
    `;
  }
}
notification-content-length-do.ts

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Don’t display all details in the notification

Source code

notification-content-length-dont.tsimport { html, LitElement } from 'lit';
import '@vaadin/button';
import '@vaadin/icon';
import '@vaadin/notification';
import '@vaadin/vaadin-lumo-styles/vaadin-iconset';
import { applyTheme } from 'Frontend/generated/theme';

export class Example extends LitElement {
  protected override createRenderRoot() {
    const root = super.createRenderRoot();
    // Apply custom theme (only supported if your app uses one)
    applyTheme(root);
    return root;
  }

  protected override render() {
    return html`
      <vaadin-notification-card slot="middle">
        <div>
          <div>New message from Aria Bailey</div>
          <div style="font-size: var(--lumo-font-size-s); color: var(--lumo-secondary-text-color);">
            Yeah, I know. But could you help me with this. I’m not sure where the bug is in my CSS?
            The checkmark doesn’t get the right color. I’m trying to use the CSS custom properties
            from our design system, but for some reason it’s not working.
          </div>
        </div>
        <vaadin-button theme="tertiary-inline">
          <vaadin-icon icon="lumo:cross"></vaadin-icon>
        </vaadin-button>
      </vaadin-notification-card>
    `;
  }
}
notification-content-length-dont.ts

Component	Usage recommendations
Dialog	Dialog should be used instead of Notification for anything that requires immediate user action.

Component

Usage recommendations

Dialog

Dialog should be used instead of Notification for anything that requires immediate user action.

77E15AD0-F634-4D81-8C4D-FAC7A21D889B

Documentation

Documentation

Notification

Theme Variants

Success

Error

Primary

Contrast

Duration

Persistent Notifications

Position

Recommendations

Stacking

Size

Interactive Elements

Making Interactive Elements Keyboard-Accessible

Icons and Other Rich Formatting

Static Helper

Best Practices

Use Sparingly

Limit Content Length

Documentation

Theme Variants

Success

Error

Primary

Contrast

Duration

Persistent Notifications

Position

Recommendations

Stacking

Size

Interactive Elements

Making Interactive Elements Keyboard-Accessible

Icons and Other Rich Formatting

Static Helper

Best Practices

Use Sparingly

Limit Content Length

Related Components