Struts2 <sx:autocompleter>自動提示例子

在Struts2，<sx:autocompleter>標記是一個組合框，當在用戶輸入文本框會自動提示下拉的提示菜單。

這裡創建一個Web工程：strut2autocompleter，來演示在多個複選框如何設置的默認值，整個項目的結構如下圖所示：

這個功能是通過Dojo庫實現的，所以，一定要包含“struts2-dojo-plugin.jar”這個依賴庫，把“struts-dojo-tags”標簽上的頁麵，並通過 <sx:head />輸出其標題信息前。

例如，

<%@ taglib prefix="sx" uri="/struts-dojo-tags" %>
<html>
<head>
<sx:head />
</head>
<body>
<sx:autocompleter label="What's your lucky number?" 
name="yourLuckyNumber" autoComplete="false"
list="{'1','12','13','14'}" />

產生下麵的HTML

<html> 
<head> 
<script language="JavaScript" type="text/javascript"> 
    // Dojo configuration
    djConfig = {
        isDebug: false,
        bindEncoding: "UTF-8"
          ,baseRelativePath: "/Struts2Example/struts/dojo/"
          ,baseScriptUri: "/Struts2Example/struts/dojo/"
         ,parseWidgets : false
        
    };
</script> 
<script language="JavaScript" type="text/javascript"
        src="/Struts2Example/struts/dojo/struts_dojo.js"></script> 
		
<script language="JavaScript" type="text/javascript"
        src="/Struts2Example/struts/ajax/dojoRequire.js"></script> 
		
<link rel="stylesheet" href="/Struts2Example/struts/xhtml/styles.css" 
type="text/css"/> 

<script language="JavaScript" src="/Struts2Example/struts/utils.js" 
type="text/javascript"></script> 

<script language="JavaScript" src="/Struts2Example/struts/xhtml/validation.js" 
type="text/javascript"></script> 

<script language="JavaScript" src="/Struts2Example/struts/css_xhtml/validation.js" 
type="text/javascript"></script> 
</head> 
...
<tr>
<td class="tdLabel">
<label for="resultAction_yourLuckyNumber" class="label">
What's your lucky number?:</label></td>
<td>  
<select dojoType="struts:ComboBox" id="resultAction_yourLuckyNumber" 
autoComplete="false" name="yourLuckyNumber" 
keyName="yourLuckyNumberKey" visibleDownArrow="true" >
    <option value="1">1</option>
    <option value="12">12</option>
    <option value="13">13</option>
    <option value="14">14</option>
</select>
</td>
</tr>
<script language="JavaScript" type="text/javascript">
djConfig.searchIds.push("resultAction_yourLuckyNumber");</script>

Struts2 <s:autocompleter> 示例

在一個<s:autocompleter>標簽的完整的例子，產生下拉的提示菜單，同時在相應的文本框的用戶輸入。

2. 動作類

Action類生成的Web框架的選項列表的“autocompleter”組成部分。

AutoCompleterAction.java

package com.gitbook.netmon.action;

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

import com.opensymphony.xwork2.ActionSupport;

public class AutoCompleterAction extends ActionSupport{

	private List<String> webframeworks = new ArrayList<String>();
	
	private String yourFavWebFramework;
	private String yourLuckyNumber;
	
	public AutoCompleterAction(){
		webframeworks.add("Spring MVC");
		webframeworks.add("Struts 1.x");
		webframeworks.add("Struts 2.x");
		webframeworks.add("JavaServer Faces (JSF)");
		webframeworks.add("Google Web Toolkit (GWT)");
		webframeworks.add("Apache Wicket");
		webframeworks.add("Apache Click");
		webframeworks.add("Apache Cocoon");
		webframeworks.add("JBoss Seam");
		webframeworks.add("Stripes");
		webframeworks.add("Apache Tapestry");
		webframeworks.add("Others");
	}
	
	public String getYourLuckyNumber() {
		return yourLuckyNumber;
	}

	public void setYourLuckyNumber(String yourLuckyNumber) {
		this.yourLuckyNumber = yourLuckyNumber;
	}

	public String getYourFavWebFramework() {
		return yourFavWebFramework;
	}

	public void setYourFavWebFramework(String yourFavWebFramework) {
		this.yourFavWebFramework = yourFavWebFramework;
	}

	public List<String> getWebframeworks() {
		return webframeworks;
	}

	public void setWebframeworks(List<String> webframeworks) {
		this.webframeworks = webframeworks;
	}

	public String display() {
		return NONE;
	}
	
}

3. 結果頁麵

通過“<s:autocompleter>”渲染“autocompleter”組件標簽，並產生通過Java列表和OGNL自動下拉提示菜單。

autocompleter.jsp

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

<html>
<head>
<sx:head />
</head>

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

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

<sx:autocompleter label="What's your lucky number?" 
name="yourLuckyNumber" autoComplete="false"
list="{'1','12','13','14','21','22','23','24',
'31','32','33','34','41','42','43','44'}" />

<sx:autocompleter label="What's your favorite web framework?" 
list="webframeworks" name="yourFavWebFramework" />

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

</body>
</html>

result.jsp

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

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

<h2>
   Lucky Number : <s:property value="yourLuckyNumber"/> 
</h2> 

<h2>
   Web Appication Frameworks : <s:property value="yourFavWebFramework"/> 
</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="autoCompleterAction" 
	class="com.gitbook.netmon.action.AutoCompleterAction" 
        method="display">
	<result name="none">/pages/autocompleter.jsp</result>
  </action>
		
  <action name="resultAction" 
        class="com.gitbook.netmon.action.AutoCompleterAction" >
	<result name="success">/pages/result.jsp</result>
  </action>
</package>
	
</struts>

注意：如果靜態文件未找到，或是不能打日期選擇，請下載代碼並參考其中的web.xml配置。

  <filter-mapping>    
       <filter-name>struts2</filter-name>    
       <url-pattern>/struts/*</url-pattern>    
   </filter-mapping>

4. 示例

http://localhost:8080/Struts2Example/autoCompleterAction.action

下麵是另一個例子，說明使用JSON數據，提供選擇選項列表中的autocompleter組件 – Struts2 autocompleter + JSON 示例