单行json_ajax

html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>ajax json jquery 菜单案例</title>
<style type="text/css">
*{margin:0;padding:0;}    
body { font-size: 13px; line-height: 130%; padding: 60px }
</style>
<link rel="stylesheet" type="text/css" href="../css/style.css"/>
<script src="../js/jquery-2.1.1.min.js"></script>
<script type="text/javascript">
$(function(){
$("#first").change(function() {
var id=document.getElementById("first").value;
 $.ajax({
     type: "POST",
     url: "../jsp/second1.jsp",
     data: "id="+id,
    dataType: "json",
    success: function(data) {
        var cityList=eval(data);
        var secondRoot=document.getElementById("second");
        secondRoot.innerHTML=null;
        for(var i=0;i<data.length;i++)
        {
            var op = document.createElement("option");
            op.innerHTML=cityList[i];
            secondRoot.appendChild(op);
        }
    },
    error:function(data){
        alert(data);
    }
    });
});
});
   
</script>
</head>
<body>
   <select name="first" id="first" style="width:160px">
        <option value="0">---请选择---</option>
        <option value="1" >中国</option>
        <option value="2">美国</option>
        <option value="3">英国</option>
    </select>
    <select name="second" id="second" size="3" style="width:160px"></select>
</body>
</html>

jsp

<%@ page contentType="text/html; charset=UTF-8" language="java"%>
<%@ page import="java.util.*,net.sf.json.JSONArray" %>
<%
    String idStr = (String)request.getParameter("id");
    int id = idStr == null ? 1 : Integer.parseInt(idStr);
    switch(id){
        case 1:
            out.println(JSONArray.fromObject("['上海','广州','山东']"));
            break;
        case 2:
            out.println(JSONArray.fromObject("['美国1','美国2','美国3']"));
            break;
        case 3:
            out.println(JSONArray.fromObject("['英国1','英国2','英国3']"));
            break;
    } 
    
%>

 

posted on 2017-11-27 18:54  song.yan  阅读(259)  评论(0)  编辑  收藏  举报