    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
    015    package org.apache.tapestry5;
    016
    017    import org.apache.tapestry5.annotations.RequestParameter;
    018    import 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     */
    025    public 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    }