    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}