Query Parameters
It is possible to get any query parameters contained in a URL, for example ?name1=value1&name2=value2.
Use the getQueryParameters() method of a Location instance to access query parameters.
You can obtain the Location instance through the BeforeEnterEvent parameter of the BeforeEnterObserver::beforeEnter or the BeforeEvent parameter of the HasUrlParameter::setParameter method.
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Note
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A Location object represents a relative URL made up of path segments and query parameters, without the hostname, that is new Location ("book/search?keyword=Vaadin").
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Example: Retrieving query parameters from a BeforeEvent.
@Override
public void setParameter(BeforeEvent event,
@OptionalParameter String parameter) {
Location location = event.getLocation();
QueryParameters queryParameters = location.getQueryParameters();
Map<String, List<String>> parametersMap = queryParameters
.getParameters();
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Note
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getQueryParameters() supports multiple values associated with the same key, for example https://example.com/?genre=fiction&restrictions=16+&genre=classic will result in the corresponding map {"genre" : ["fiction", "classic"], "restrictions": ["16+"]}}.
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