001// Copyright 2008, 2010, 2011 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.corelib.components; 016 017import org.apache.tapestry5.ComponentResources; 018import org.apache.tapestry5.MarkupWriter; 019import org.apache.tapestry5.annotations.Environmental; 020import org.apache.tapestry5.annotations.SupportsInformalParameters; 021import org.apache.tapestry5.corelib.internal.AjaxFormLoopContext; 022import org.apache.tapestry5.ioc.annotations.Inject; 023import org.apache.tapestry5.services.javascript.JavaScriptSupport; 024 025/** 026 * Used inside an {@link org.apache.tapestry5.corelib.components.AjaxFormLoop} component to spur the addition of a new 027 * row. Triggers a server-side {@linkplain org.apache.tapestry5.EventConstants#ADD_ROW addRow} event on the 028 * AjaxFormLoop, which must return the newly added object, which will be rendered in the body of the AjaxFormLoop and 029 * sent to the client web browser. 030 * 031 * @tapestrydoc 032 */ 033@SupportsInformalParameters 034public class AddRowLink 035{ 036 @Environmental 037 private AjaxFormLoopContext context; 038 039 @Inject 040 private JavaScriptSupport jsSupport; 041 042 @Inject 043 private ComponentResources resources; 044 045 void beginRender(MarkupWriter writer) 046 { 047 String id = jsSupport.allocateClientId(resources); 048 049 writer.element("a", "id", id, "href", "#"); 050 resources.renderInformalParameters(writer); 051 052 context.addAddRowTrigger(id); 053 } 054 055 void afterRender(MarkupWriter writer) 056 { 057 writer.end(); 058 } 059}