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1   /*
2    * $Id: DoubleSelect.java 501758 2007-01-31 07:56:28Z mrdon $
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *  http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  package org.apache.struts2.components;
22  
23  import javax.servlet.http.HttpServletRequest;
24  import javax.servlet.http.HttpServletResponse;
25  
26  import org.apache.struts2.views.annotations.StrutsTag;
27  
28  import com.opensymphony.xwork2.util.ValueStack;
29  
30  /***
31   * <!-- START SNIPPET: javadoc -->
32   * Renders two HTML select elements with second one changing displayed values depending on selected entry of first one.
33   * <!-- END SNIPPET: javadoc -->
34   *
35   * <p/> <b>Examples</b>
36   *
37   * <pre>
38   * <!-- START SNIPPET: example -->
39   * &lt;s:doubleselect label="doubleselect test1" name="menu" list="{'fruit','other'}" doubleName="dishes" doubleList="top == 'fruit' ? {'apple', 'orange'} : {'monkey', 'chicken'}" /&gt;
40   * &lt;s:doubleselect label="doubleselect test2" name="menu" list="#{'fruit':'Nice Fruits', 'other':'Other Dishes'}" doubleName="dishes" doubleList="top == 'fruit' ? {'apple', 'orange'} : {'monkey', 'chicken'}" /&gt;
41   * <!-- END SNIPPET: example -->
42   * </pre>
43   *
44   */
45  @StrutsTag(name="doubleselect", tldTagClass="org.apache.struts2.views.jsp.ui.DoubleSelectTag", description="Renders two HTML select elements with second one changing displayed values depending on " +
46                  "selected entry of first one.")
47  public class DoubleSelect extends DoubleListUIBean {
48      final public static String TEMPLATE = "doubleselect";
49  
50  
51      public DoubleSelect(ValueStack stack, HttpServletRequest request, HttpServletResponse response) {
52          super(stack, request, response);
53      }
54  
55      protected String getDefaultTemplate() {
56          return TEMPLATE;
57      }
58  
59      public void evaluateExtraParams() {
60          super.evaluateExtraParams();
61  
62          // force the onchange parameter
63          addParameter("onchange", getParameters().get("id") + "Redirect(this.options.selectedIndex)");
64      }
65  }