Ajax动态加载数据库示例

!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>
title>/title>
script type ="text/javascript">
function btnClick() {
var xmlhttp = xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
if (!xmlhttp) {
alert("创建xmlhttp对象异常!");
return false;
}
var text1 = document.getElementById("Text1");
xmlhttp.open("post","GetPrice2.ashx?ts"+text1, false);
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4) {
if (xmlhttp.status == 200) {
document.getElementById("Text2").value = xmlhttp.responseText;
}
else {
alert("Ajax返回错误！");
}
}
}
xmlhttp.send();
}
/script>
/head>
body>

p>
产品名称：input id="Text1" type="text" />/p>
p>
价格：input id="Text2" type="text" />/p>
p>
input id="Button1" type="button" value="查询" onclick = "btnClick()"/>/p>
/body>
/html>

%@ WebHandler Language="C#" Class="GetPrice" %>

using System;
using System.Linq;
using System.Web;
using DataSetProductsTableAdapters;

public class GetPrice : IHttpHandler {

public void ProcessRequest (HttpContext context)
{
context.Response.ContentType = "text/plain";
//context.Response.Write("Hello World");
string name = context.Request["text1"];
var data = new PriceTableAdapter().GetDataByName(name);//需要建一个强类型的dataset
if (data.Count = 0)
{
context.Response.Write("none|0");
}
else
{
context.Response.Write("ok|" + data.Single().Price);
}
}

public bool IsReusable {
get {
return false;
}
}

}