Query Parameters

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.

Note	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”)`.

Example: Retrieving query parameters from a BeforeEvent.

Java

@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+”]}}`.