前台頁面AjaxTest.htm,內容如下
| 代碼如下 |
複製代碼 |
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" http://www.111cn.net> <html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>本頁用不同的方式與後台進行互動</title>
<script type="text/javascript" src="JS/jquery-1.4.2.min.js"></script>
<script type="text/javascript" > //使用jquery庫進行ajax互動
$(document).ready(function(){ //進行一個ajax請求,command告訴後台調用哪個方法
$.get("Handler.ashx",{command:"method1",value:"chentao"},function(data){
alert(data);
}); //進行一個ajax請求,command告訴後台調用method2方法
$.get("Handler.ashx",{command:"method2",value:"tangyu"},function(data){
alert(data);
})
</script>
</head>
<body> </body>
</html> |
後台建立一個Handler.ashx頁面 內容如下
| 代碼如下 |
複製代碼 |
<%@ WebHandler Language="C#" class="Handler" %> using System;
using System.Web; public class Handler : IHttpHandler {
public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/plain";
if (context.Request["command"]!=null)
{ //得到前台傳過來的command,確定調用哪個方法
string command = context.Request["command"].ToString();
string data = context.Request["value"].ToString();
switch (command)
{
case "method1":
method1(context);
break;
case "method2":
method2(context);
break;
default:
break;
}
}
}
public bool IsReusable {
get {
return false;
}
}
public void method1(HttpContext context)
{
context.Response.Write("hello,"+context.Request["value"].ToString());
}
public void method2(HttpContext context)
{
context.Response.Write("hello,"+context.Request["value"].ToString());
}
} |
如果有多個方法,switch case裡的判斷將會很多.考慮用更簡單的方法.使用反射
| 代碼如下 |
複製代碼 |
<%@ WebHandler Language="C#" class="Handler" %> using System;
using System.Web; public class Handler : IHttpHandler {
public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "text/plain";
if (context.Request["command"] != null)
{ //
string command = context.Request["command"].ToString();
System.Reflection.MethodInfo method = this.GetType().GetMethod(command);
if (method != null)
{
method.Invoke(this, new object[] { context});
}
}
}
public bool IsReusable {
get {
return false;
}
}
public void method1(HttpContext context)
{
context.Response.Write("hello"+context.Request["value"].ToString());
}
public void method2(HttpContext context)
{ context.Response.Write("hello,"+context.Request["value"].ToString());
} } |
使用反射大大簡化了程式.
=====================================================
使用aspx頁面與ajax互動
建立一個aspx頁面 WebMethod.aspx
將WebMethod.aspx頁裡的多餘部分刪除,只保留
| 代碼如下 |
複製代碼 |
| <%@ Page Language="C#" AutoEventWireup="true" CodeFile="WebMethod.aspx.cs" Inherits="WebMethod" %> |
這一條語句
WebMethod.aspx.cs內容如下
| 代碼如下 |
複製代碼 |
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts; using System.Web.Services;
using System.Reflection; public partial class WebMethod : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string methodName = HttpContext.Current.Request.PathInfo.Substring(1);
// Response.Write(methodName);
MethodInfo method = this.GetType().GetMethod(methodName);
if (method != null)
{
Response.Write(method.Invoke(this,new object[]{}));
}
// Response.Write(GetResult());
}
[WebMethod(EnableSession=true)]
public string GetResult()
{
//return "hello";
if (HttpContext.Current.Request["name"] != null)
{
string value = HttpContext.Current.Request["name"].ToString();
//HttpContext.Current.Request.PathInfo;
return "{'name':'"+value+"'}";
}
else
{
return "{name:'error'}";
}
}
} test.html頁面與WebMethod.aspx頁面進行ajax互動 test.html頁面內容 <!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>使用aspx頁面進行互動</title>
<script type="text/javascript" src="JS/jquery-1.4.2.min.js"></script>
<script type="text/javascript" >
$(document).ready(function(){ $.ajax({
type: "POST",
url: "WebMethod.aspx/GetResult",
data: "name=chentao",
dataType: "text",
success: function(d){
alert(d);
} });
});
</script>
</head>
<body> </body>
</html> |
