Index.aspx前臺頁面
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="index.aspx.cs" Inherits="TestAjaxProgressbar.index" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<script src="Script/jquery-1.8.2.js"></script>
<link href="Script/jquery-ui.min.css" rel="stylesheet" />
<script src="Script/jquery-ui.min.js"></script>
<title>測試Ajax進度條</title>
<script type="text/javascript">
function GetProgress() {
$.ajax({
url: "/Processing.ashx",
type: "POST",
data: { "RequestType": "AjaxRequest", "Method": "GetProgress" },
success: function (data) {
if (data != -1) {
//工作沒有結束，繼續查詢進度
setTimeout(GetProgress, 500);
$("#progress").html( data);
$("#progressbar").progressbar({ value: parseInt(data) });
} else {
//工作完成
$("#progress").html("done");
$("#progressbar").progressbar({ value: 100 });
$("#btn1").attr("disabled", false);
}
}
});
}
function DoWork() {
//禁用按鈕
$("#btn1").attr("disabled", true);
$.ajax({
url: "/Processing.ashx",
type: "POST",
data: { "RequestType": "AjaxRequest", "Method": "DoWork" }
});
//開始查詢進度
setTimeout(GetProgress, 500);
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input type="button" id="btn1" value="開始" onclick="DoWork();" />
<label id="progress"></label>
<div id="progressbar" class="easyui-progressbar" style="width:500px;height:35px"></div>
</div>
</form>
</body>
</html>
Processing.ashx後臺
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Web;
namespace TestAjaxProgressbar
{
/// <summary>
/// Processing 的摘要說明
/// </summary>
public class Processing : IHttpHandler
{
// context
private HttpContext context;
public bool IsReusable
{
get
{
return false;
}
}
public void ProcessRequest(HttpContext context)
{
this.context = context;
if (context.Request["RequestType"] == "AjaxRequest")
{
if (context.Request["Method"] == "GetProgress")
{
context.Response.Clear();
context.Response.Write(this.GetProgress());
context.Response.End();
}
else
{
this.DoWork();
}
}
}
/// <summary>
/// 開始工作
/// </summary>
private void DoWork()
{
for (int i = 0; i < 100; i++)
{
// 記錄進度
// 實際應用中需要進一步控制（利用用戶信息、cookies等），防止併發造成混亂
this.context.Application["progress"] = i + 1;
Random r = new Random();
Thread.Sleep(r.Next(10, 100));
}
this.context.Application["progress"] = null;
}
/// <summary>
/// 查詢進度
/// </summary>
/// <returns>進度</returns>
private int GetProgress()
{
if (this.context.Application["progress"] != null)
{
return (int)this.context.Application["progress"];
}
else
{
return -1;
}
}
}
}