Query Parameters
We can retrieve 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 retrieve the Location class through the BeforeEnterEvent parameter of the BeforeEnterObserver::beforeEnter() method or the BeforeEvent parameter of the HasUrlParameter::setParameter() method.
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A Location object represents a relative URL made up of path segments and query parameters, but without the host name; for example, 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();
}Note | 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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