AJAX即“Asynchronous Javascript And XML”（异步JavaScript和XML），是指一种创建交互式网页应用的网页开发技术。
AJAX = 异步 JavaScript和XML（标准通用标记语言的子集）。
AJAX 是一种用于创建快速动态网页的技术。
通过在后台与服务器进行少量数据交换，AJAX 可以使网页实现异步更新。这意味着可以在不重新加载整个网页的情况下，对网页的某部分进行更新。
跨语言传递数据：
xml：
结构不清晰
代码量比较大
查找起来比较费事
非面向对象结构
json：
结构清晰
代码量相对较小
面向对象的处理解析方式，查找数据很简单
键值对
{"key1":"value","key2":"value"}
多个对象的json
[{"key1":"value","key2":"value"},{"key1":"value","key2":"value"},{"key1":"value","key2":"value"}]
模糊查询
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script src="js/jquery-1.7.2.min.js"></script>
<style>
* {
margin: 0px;
padding: 0px;
}
.tab {
text-align: center;
margin: auto;
80%;
margin-top: 10px;
}
.hea {
height: 40px;
background-color: #4800ff;
color: white;
}
#tb1 {
margin-left: 200px;
height: 40px;
font-size: 18px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="tb1" runat="server"></asp:TextBox>
<table class="tab">
<tr class="hea">
<td>编号</td>
<td>商品名</td>
<td>数量</td>
<td>进货日期</td>
<td>保质期/天</td>
<td>进货联系人</td>
<td>联系电话</td>
</tr>
<tr>
<td id="ids"></td>
<td id="sna"></td>
<td id="shu"></td>
<td id="date"></td>
<td id="bao"></td>
<td id="ren"></td>
<td id="tel"></td>
</tr>
</table>
</div>
</form>
</body>
</html>
<script>
var oTxt1 = document.getElementById("tb1");
oTxt1.onkeyup = function () {
var c = oTxt1.value;
$.ajax({
url: "ajax/Handler.ashx", //要将此次请求提交到哪个服务端去
data: { "zhangke": c }, //给服务端带的数据，可以没有，也可以多个
type: "post", //传递的方式
dataType: "json", //数据传递的格式
success: function (aaa) {
document.getElementById("ids").innerHTML = aaa.ids;
document.getElementById("sna").innerHTML = aaa.sna;
document.getElementById("shu").innerHTML = aaa.shu;
document.getElementById("date").innerHTML = aaa.date;
document.getElementById("bao").innerHTML = aaa.bao;
document.getElementById("ren").innerHTML = aaa.ren;
document.getElementById("tel").innerHTML = aaa.tel;
}
});
};
</script>
public Goods Selectmohu(string an)
{
Goods g = null;
cmd.CommandText = "select * from Warehouse where Sname like @a";
cmd.Parameters.Clear();
cmd.Parameters.AddWithValue("@a","%"+an+"%");
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
if (dr.HasRows)
{
while (dr.Read())
{
g = new Goods();
g.Ids = Convert.ToInt32(dr["Ids"]);
g.Sname = dr["Sname"].ToString();
g.Number = dr["Number"].ToString();
g.Date = Convert.ToDateTime(dr["Date"]);
g.Shelf = Convert.ToInt32(dr["Shelf"]);
g.Contacts = dr["Contacts"].ToString();
g.Tel = dr["Tel"].ToString();
}
}
conn.Close();
return g;
}
<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Web;
using System.Collections.Generic;
public class Handler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
string s = context.Request["zhangke"];
Goods g = new GoodsData().Selectmohu(s);
string end = "{"ids":"" + g.Ids.ToString() + "","sna":"" + g.Sname + "","shu":"" + g.Number + "","date":"" + g.Date.ToShortDateString() + "","bao":"" + g.Shelf + "","ren":"" + g.Contacts + "","tel":"" + g.Tel + ""}";
context.Response.Write(end);
context.Response.End();
}
public bool IsReusable
{
get
{
return false;
}
}
}