@H_403_0@<body>
@H_403_0@<form action="">
@H_403_0@<select id="college" name="college" ></select>
@H_403_0@</form>
@H_403_0@<script>
@H_403_0@
@H_403_0@var xmlHttp = "";
@H_403_0@function getXmlHttpRequest(){
@H_403_0@if(window.XMLHttpRequest)
@H_403_0@xmlHttp = new XMLHttpRequest();
@H_403_0@else
@H_403_0@xmlHttp = new ActiveXObject("Microsoft.XMLHttp");
@H_403_0@return xmlHttp;
@H_403_0@}
@H_403_0@function checkName()
@H_403_0@{
@H_403_0@//获得HttpRequest对象
@H_403_0@xmlHttp = getXmlHttpRequest();
@H_403_0@//得到url
@H_403_0@url="jsonserver.jsp";
@H_403_0@//打开请求
@H_403_0@xmlHttp.open("get",url,true);
@H_403_0@//指定回调函数
@H_403_0@xmlHttp.onreadystatechange = getResult;
@H_403_0@//向服务器发送请求
@H_403_0@xmlHttp.send(null);
@H_403_0@
@H_403_0@}
@H_403_0@function getResult()
@H_403_0@{
@H_403_0@if(xmlHttp.readyState == 4 && xmlHttp.status == 200)
@H_403_0@{
@H_403_0@//eval 将json格式转化为javascript类型的字符串，但是注意eval可能对本地计算机具有不安全性
@H_403_0@var result = eval('('+xmlHttp.responseText+')');
@H_403_0@for(var i=0;i<result.length;i++)
@H_403_0@{
@H_403_0@document.getElementById("college").options.add(new Option(result[i].cname,result[i].vlaue));
@H_403_0@}
@H_403_0@
@H_403_0@}
@H_403_0@
@H_403_0@}
@H_403_0@document.onreadystatechange = getCollege;//获取列表内容
@H_403_0@function getCollege()
@H_403_0@{
@H_403_0@if(document.readyState == "complete")
@H_403_0@checkName();
@H_403_0@
@H_403_0@}
@H_403_0@</script>
@H_403_0@</body>
@H_403_0@</html>
@H_403_0@
@H_403_0@jsonserver.jsp
@H_403_0@
@H_403_0@
@H_403_0@<%
@H_403_0@response.setHeader("Content-Type","text/xml");
@H_403_0@response.setHeader("charset","utf-8");
@H_403_0@String result ="[{\"value\":0,\"cname\":\"软件学院\"},{\"value\":\"1\",\"cname\":\"计算机学院\"}]";
@H_403_0@System.out.println(result);
@H_403_0@out.print(result);
@H_403_0@out.flush();
@H_403_0@%>
