java jquery json实现二级级联互动菜单(转)...

时间：2010-08-08 来源：liguohuaty

jsp页面的代码：
<%@ 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}, // 参数
type : "post",
cache : false,
dataType : "json", //返回json数据
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">
请选择部门类型
<s:select list="rfones" listKey="recordId" listValue="title" name="oneId" theme="simple" id="oneId" value="oneID" onchange="onchangeShow(this.value)"></s:select>

请选择文件类型
<s:select list="rftwos" listKey="recordId" listValue="title" name="twoId" theme="simple" id="twoId" value="twoID"></s:select>
</div>
</body>
</html>

struts中action的代码

/**
* des:取得二级联动菜单
* autho:exceljava
* date:Nov 20, 2009
* @return
* @throws IOException
*/
public String getJsonCategory() throws IOException{
rfjsons=archiveService.getCategoryByParentID(parentId);//这里从数据库取得数据
net.sf.json.JSONArray jsonObj=net.sf.json.JSONArray.fromObject(rfjsons);//组装成json数据
sendMessage(jsonObj.toString());//向视图push json数据
return null;
}
/**
* des:封装发送json格式的数据回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);
}