Ajax动态加载数据库

发布时间：2020-12-16 00:33:54 所属栏目：百科来源：网络整理

导读：!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 xmlht

<!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;
        }
    }

}

（编辑：李大同）

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