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1   /*
2    * $Id: DoubleSelect.java 768476 2009-04-25 06:07:58Z nilsga $
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  
22  package org.apache.struts2.components;
23  
24  import javax.servlet.http.HttpServletRequest;
25  import javax.servlet.http.HttpServletResponse;
26  
27  import org.apache.commons.lang.xwork.StringUtils;
28  import org.apache.struts2.views.annotations.StrutsTag;
29  
30  import com.opensymphony.xwork2.util.ValueStack;
31  
32  /***
33   * <!-- START SNIPPET: javadoc -->
34   * Renders two HTML select elements with second one changing displayed values depending on selected entry of first one.
35   * <!-- END SNIPPET: javadoc -->
36   *
37   * <p/> <b>Examples</b>
38   *
39   * <pre>
40   * <!-- START SNIPPET: example -->
41   * &lt;s:doubleselect label="doubleselect test1" name="menu" list="{'fruit','other'}" doubleName="dishes" doubleList="top == 'fruit' ? {'apple', 'orange'} : {'monkey', 'chicken'}" /&gt;
42   * &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;
43   * <!-- END SNIPPET: example -->
44   * </pre>
45   *
46   */
47  @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 " +
48                  "selected entry of first one.")
49  public class DoubleSelect extends DoubleListUIBean {
50      final public static String TEMPLATE = "doubleselect";
51  
52  
53      public DoubleSelect(ValueStack stack, HttpServletRequest request, HttpServletResponse response) {
54          super(stack, request, response);
55      }
56  
57      protected String getDefaultTemplate() {
58          return TEMPLATE;
59      }
60  
61      public void evaluateExtraParams() {
62          super.evaluateExtraParams();
63          StringBuilder onchangeParam = new StringBuilder();
64          onchangeParam.append(getParameters().get("id")).append("Redirect(this.options.selectedIndex)");
65          if(StringUtils.isNotEmpty(this.onchange)) {
66          	onchangeParam.append(";").append(this.onchange);
67          }
68          // force the onchange parameter
69          addParameter("onchange", onchangeParam.toString());
70      }
71  }