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}