利用了jquery的ajax實現(xiàn)二級聯(lián)互動菜單

2019-11-20 21:32:19

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來源：轉載

供稿：網友

菜單資源保存在數(shù)據(jù)庫中。利用了jquery的ajax實現(xiàn)。用到的包有：json-lib-2.2.3-jdk15.jar ezmorph-1.0.6.jar json.js jquery.js

jsp頁面的代碼：

復制代碼代碼如下:

 
<%@ page contentType="text/html; charset=gbk"%> 
<%@ taglib prefix="s" uri="/struts-tags"%> 
<script type="text/javascript" src="js/jquery.js"></script> 
<script type="text/javascript" src="js/json.js"></script> 
<% String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + "/"; 
out.println(basePath); 
%> 

<script type="text/javascript"> 
jQuery(function($){ 
//alert("ok"); 
}); 
function onchangeShow(oneId){ 
$.ajax({ 
url : "<%=basePath%>cateJson.whbs", 
data : {parentId : oneId}, // 參數(shù) 
type : "post", 
cache : false, 
dataType : "json", //返回json數(shù)據(jù) 
error: function(){ 
alert('error'); 
}, 
success:onchangecallback 
}); 
} 
function onchangecallback(data){ 
document.all['twoId'].options.length = 0; //清空原有的option 
var str=""; 
for(var i=0;i<data.length;i++){ 
str+="<option value='"+data[i].recordId+"'>"+data[i].title+"</option>" 
} 
$("#twoId").html(str); 
} 
</script> 
<html> 
<body> 
<div align="center"> 
請選擇部門類型 
<s:select list="rfones" listKey="recordId" listValue="title" name="oneId" theme="simple" id="oneId" value="oneID" onchange="onchangeShow(this.value)"></s:select> 

請選擇文件類型 
<s:select list="rftwos" listKey="recordId" listValue="title" name="twoId" theme="simple" id="twoId" value="twoID"></s:select> 
</div> 
</body> 
</html> 

struts中action的代碼

復制代碼代碼如下:

 
/** 
* des:取得二級聯(lián)動菜單 
* autho:exceljava 
* date:Nov 20, 2009 
* @return 
* @throws IOException 
*/ 
public String getJsonCategory() throws IOException{ 
rfjsons=archiveService.getCategoryByParentID(parentId);//這里從數(shù)據(jù)庫取得數(shù)據(jù) 
net.sf.json.JSONArray jsonObj=net.sf.json.JSONArray.fromObject(rfjsons);//組裝成json數(shù)據(jù) 
sendMessage(jsonObj.toString());//向視圖push json數(shù)據(jù) 
return null; 
} 
/** 
* des:封裝發(fā)送json格式的數(shù)據(jù)回js 
* autho:exceljava 
* date:Nov 20, 2009 
* @param content 
* @throws IOException 
*/ 
public void sendMessage(String content) throws IOException{ 
HttpServletResponse response = ServletActionContext.getResponse(); 
response.setCharacterEncoding("UTF-8"); 
response.getWriter().write(content); 

} 