001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.wicket.markup.html; 018 019import org.apache.wicket.Application; 020import org.apache.wicket.markup.head.HeaderItem; 021import org.apache.wicket.markup.head.IHeaderResponse; 022import org.apache.wicket.util.io.IClusterable; 023 024/** 025 * An interface to be implemented by application level listeners or other entities that wish to 026 * contribute to the header section of the page. Class {@link org.apache.wicket.Component} already 027 * implements it. <br/> 028 * Example: <br/> 029 * <br/> 030 * 031 * <pre> 032 * class MyPanel extends Panel 033 * { 034 * public MyPanel(String id) 035 * { 036 * super(id); 037 * } 038 * 039 * public void renderHead(IHeaderResponse response) 040 * { 041 * response.render(JavaScriptHeaderItem.forScript("alert('page loaded!');")); 042 * } 043 * } 044 * </pre> 045 * 046 * @see IHeaderResponse 047 * @see HeaderItem 048 * @see Application#getHeaderContributorListeners() 049 * 050 * @author Juergen Donnerstag 051 * @author Matej Knopp 052 */ 053public interface IHeaderContributor extends IClusterable 054{ 055 /** 056 * Render to the web response whatever the component wants to contribute to the head section. 057 * 058 * @param response 059 * Response object 060 */ 061 void renderHead(IHeaderResponse response); 062}