001// Copyright 2010 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007// http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5;
016
017import org.apache.tapestry5.annotations.RequestParameter;
018import org.apache.tapestry5.corelib.components.Zone;
019
020/**
021 * Defines constants for common query parameters passed in requests from the client.
022 * 
023 * @see RequestParameter
024 */
025public class QueryParameterConstants
026{
027    /**
028     * The client-side id of the element being updated in an Ajax request. This is very useful when writing
029     * new content that may update the same zone dynamically, even when the {@link Zone} has allocated a dynamic
030     * client-side id during initial render.
031     */
032    public static final String ZONE_ID = "t:zoneid";
033}