后台C#代码
public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; string name = context.Request["Name"]; var data = new T_UsersTableAdapter().GetDataByName(name); JavaScriptSerializer jss = new JavaScriptSerializer(); if (data.Count <= 0) { var user = jss.Serialize(new Users() { Status = "error", Age = 0 }); context.Response.Write(user); } else { var user = jss.Serialize(new Users() { Status = "ok", Age = data.Single().Age }); context.Response.Write(user); } } public class Users { public string Status { set; get; } public int Age { set; get; } }
html页面
<body> <input id="user" type="text" /> <input id="btnSearch" onclick="search();" type="button" value="查询" /> <input id="btnSearch1" onclick="search1();" type="button" value="Jquery查询" /> <div id="userInfo"></div> </body>
前台javascript和jquery分别实现ajax
<script type="text/javascript">
function search() {
var xmlhttp;
var name = document.getElementById("user").value;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
} else {
xmlhttp = new ActiveXObject(Microsoft.XMLHTTP);
}
xmlhttp.open("post", "HandlerUsers.ashx?name=" + name, false);
var div = document.getElementById("userInfo");
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4) {
if (xmlhttp.status == 200) {
var arr = xmlhttp.responseText;
arr = JSON.parse(arr);
if (arr.Status == "ok") {
div.innerHTML = arr.Age;
} else {
div.innerHTML = "查找的用户名不存在！";
}
} else {
div.innerHTML = "ajax错误！";
}
}
}
xmlhttp.send();
}
function search1() {
$(function () {
var name = $("#user").val();
var div = $("#userInfo");
$.post("HandlerUsers.ashx", { "name": name }, function (data, status) {
if (status == "success") {
var user = $.parseJSON(data);
alert(user);
if (user.Status == "ok") {
div.html(user.Age);
} else {
div.html("查询的用户名不存在！");
}
} else {
div.html("ajax错误！");
}
});
});
}
</script>