Struts2教學 » Struts2 <s:updownselect>範例

Struts2 <s:updownselect>範例

在Struts2，<s:updownselect>標籤用於建立一個帶有按鈕的HTML選擇元件向上或向下移動在選擇元件的選項。當提交表單時，所有的選擇方案將提交在它們的排列順序。

這裡建立一個Web工程：strut2updownselect，來演示在多個核取方塊如何設定的預設值，整個專案的結構如下圖所示：

<s:updownselect> 範例 

<s:updownselect
list="#{'KFC':'KFC', 'McDonald':'McDonald', 'Burger King':'Burger King',
'Pizza Hut':'Pizza Hut', 'Fat Boy King':'Fat Boy King'}"
name="favFastFood"
headerKey="-1"
headerValue="--- Please Order ---" 
size="7"
/>

產生下面的HTML程式碼，選擇元件，按鈕和JavaScript在選擇元件向下移動的選項。 （預設的XHTML主題） 

<tr> 
<td class="tdLabel"></td> 
<td><script type="text/javascript" src="/Struts2Example/struts/optiontransferselect.js">
</script> 
<table> 
<tr><td> 
<select name="favFastFood" size="7" 
id="resultAction_favFastFood" multiple="multiple"> 
    <option value="-1">--- Please Order ---</option> 
    <option value="KFC">KFC</option> 
    <option value="McDonald">McDonald</option> 
    <option value="Burger King">Burger King</option> 
    <option value="Pizza Hut">Pizza Hut</option> 
    <option value="Fat Boy King">Fat Boy King</option> 
</select> 
<input type="hidden" id="__multiselect_resultAction_favFastFood" 
name="__multiselect_favFastFood" value="" /> 
</td></tr> 
<tr><td> 
 <input type="button" value="^" onclick="
moveOptionUp(document.getElementById('resultAction_favFastFood'), 'key', '-1');" />

 <input type="button" value="v" onclick="
moveOptionDown(document.getElementById('resultAction_favFastFood'), 'key', '-1');" />

 <input type="button" value="*" onclick="selectAllOptionsExceptSome(
document.getElementById('resultAction_favFastFood'), 'key', '-1');" />
</td></tr> 
</table></td> 
</tr> 
<script type="text/javascript"> 
 
var containingForm = document.getElementById("resultAction");
StrutsUtils.addEventListener(containingForm, "submit", 
   function(evt) {
     var updownselectObj = document.getElementById("resultAction_favFastFood");
     selectAllOptionsExceptSome(updownselectObj, "key", "-1");
   }, true);
</script>

Struts2 <s:updownselect> 範例

在一個完整的全面<s:updownselect>標籤例子來說明如何使用OGNL和Java列出的資料填充到上下按鈕選擇列表。

1. 動作類 - Action

Action類來生成和儲存選擇選項。

UpDownSelectAction.java 

package com.tw511.common.action;

import java.util.ArrayList;
import java.util.List;

import com.opensymphony.xwork2.ActionSupport;

public class UpDownSelectAction extends ActionSupport{

	private List<String> moviesList = new ArrayList<String>();

	private String favMovie;
	private String favFastFood;

	public UpDownSelectAction(){
		
		moviesList.add("Spider Man");
		moviesList.add("Matrix");
		moviesList.add("Super Man");
		moviesList.add("Dark Knight");
		moviesList.add("BraveHeart");
		moviesList.add("Ultraman");
		
	}
	
	public String getFavFastFood() {
		return favFastFood;
	}

	public void setFavFastFood(String favFastFood) {
		this.favFastFood = favFastFood;
	}

	public List<String> getMoviesList() {
		return moviesList;
	}

	public void setMoviesList(List<String> moviesList) {
		this.moviesList = moviesList;
	}

	public String getFavMovie() {
		return favMovie;
	}

	public void setFavMovie(String favMovie) {
		this.favMovie = favMovie;
	}

	public String execute() throws Exception{
		
		return SUCCESS;
	}

	public String display() {
		return NONE;
	}
	
}

2. 結果頁面

通過「<s:updownselect>」渲染上下按鈕選擇元件標籤。

updownselect.jsp 

<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<s:head />
</head>

<body>
<h1>Struts 2 updownselect example</h1>

<s:form action="resultAction" namespace="/" method="POST" >

<s:updownselect
list="#{'KFC':'KFC', 'McDonald':'McDonald', 'Burger King':'Burger King',
'Pizza Hut':'Pizza Hut', 'Fat Boy King':'Fat Boy King'}"
name="favFastFood"
headerKey="-1"
headerValue="--- Please Order ---" 
size="7"
/>

<s:updownselect
list="moviesList"
name="favMovie"
headerKey="-1"
headerValue="--- Please Order ---"
size="10"
moveUpLabel="Move Up"
moveDownLabel="Move Down"
selectAllLabel="Select All" />

<s:submit value="submit" name="submit" />
	
</s:form>

</body>
</html>

result.jsp 

<%@ taglib prefix="s" uri="/struts-tags" %>
<html>

<body>
<h1>Struts 2 updownselect example</h1>

<h2>
   Favor fast food : <s:property value="favFastFood"/> 
</h2> 

<h2>
   Favor movies : <s:property value="favMovie"/> 
</h2> 

</body>
</html>

3. struts.xml 

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
 
<struts>

    <constant name="struts.devMode" value="true" />
	
   <package name="default" namespace="/" extends="struts-default">
		
   <action name="updownSelectAction" 
       class="com.tw511.common.action.UpDownSelectAction" method="display">
       <result name="none">pages/updownselect.jsp</result>
   </action>
		
   <action name="resultAction" class="com.tw511.common.action.UpDownSelectAction" >
       <result name="success">pages/result.jsp</result>
   </action>
  </package>
	
</struts>

4. 範例

http://localhost:8080/Struts2Example/updownSelectAction.action
選擇選項，將其向上或向下。

當提交後，所有的選項都將在它們的排列順序提交。

參考

  1. Struts 2 updownselect example
  2. /20/239/8980.html

程式碼下載：http://pan.baidu.com/s/1hqtuAdY