    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
    015    package org.apache.tapestry5.corelib.components;
    016
    017    import org.apache.tapestry5.ComponentResources;
    018    import org.apache.tapestry5.MarkupWriter;
    019    import org.apache.tapestry5.annotations.Environmental;
    020    import org.apache.tapestry5.annotations.SupportsInformalParameters;
    021    import org.apache.tapestry5.corelib.internal.AjaxFormLoopContext;
    022    import org.apache.tapestry5.ioc.annotations.Inject;
    023    import 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
    034    public 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    }