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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 * <s:doubleselect label="doubleselect test1" name="menu" list="{'fruit','other'}" doubleName="dishes" doubleList="top == 'fruit' ? {'apple', 'orange'} : {'monkey', 'chicken'}" />
42 * <s:doubleselect label="doubleselect test2" name="menu" list="#{'fruit':'Nice Fruits', 'other':'Other Dishes'}" doubleName="dishes" doubleList="top == 'fruit' ? {'apple', 'orange'} : {'monkey', 'chicken'}" />
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
69 addParameter("onchange", onchangeParam.toString());
70 }
71 }