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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  }