一個(gè)無(wú)刷新效果定時(shí)自動(dòng)更新頁(yè)面的例子_.Net教程

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推薦：看看一個(gè).net版對(duì)話框控件
一直不太喜歡默認(rèn)的對(duì)話框樣式，網(wǎng)上看到個(gè)比較好看的對(duì)話框，自己修改了下做成了.net版，只在IE下測(cè)試過(guò)，其他的還沒(méi)有來(lái)得及測(cè)試，具體還三個(gè)問(wèn)題沒(méi)有解決： 1、我沒(méi)辦法像微軟ajax－script

首先在ASP.Net創(chuàng)建兩個(gè)WebForm頁(yè)，分別命名為Default1，Default2。下面給出代碼清單：

//Default1.aspx

<%@ Page Language="C#" Debug="true" AutoEventWireup="true" CodeFile="Default1.aspx.cs" Inherits="Default1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

var XmlHttp;

function doStart() {

createXmlHttpRequest();

var url = "Default2.aspx?task=reset";

XmlHttp.open("POST", url, true);

XmlHttp.onreadystatechange = startCallback;

XmlHttp.send(null);

}

function startCallback() {

if (XmlHttp.readyState == 4) {

if (XmlHttp.status == 200) {

setTimeout("pollServer()", 1000);

refreshTime();

}
else {

alert("HTTP error: " XmlHttp.status);
}

}

}

function pollServer() {

createXmlHttpRequest();

var url = "Default2.aspx?task=foo";

XmlHttp.open("POST", url, true);

XmlHttp.onreadystatechange = pollCallback;

XmlHttp.send(null);

}

function refreshTime(){

var time_span = document.getElementById("time");

var time_val = time_span.innerHTML;

var int_val = parseInt(time_val);

var new_int_val = int_val - 1;

if (new_int_val > -1) {

setTimeout("refreshTime()", 1000);

time_span.innerHTML = new_int_val;

} else {

time_span.innerHTML = 1;

}

function pollCallback() {

if (XmlHttp.readyState == 4) {

if (XmlHttp.status == 200) {

var message = XmlHttp.responseXml.getElementsByTagName("message")[0].firstChild.data;

if (message != "done") {

var new_row = createRow(message);

var table = document.getElementById("dynamicUpdateArea");

var table_body = table.getElementsByTagName("tbody").item(0);

var first_row = table_body.getElementsByTagName("tr").item(1);

table_body.insertBefore(new_row, first_row);

setTimeout("pollServer()", 1000);

refreshTime();

}

}
else {

alert("HTTP error: " XmlHttp.status);
}

}

function createRow(message) {

var row = document.createElement("tr");

var cell = document.createElement("td");

var cell_data = document.createTextNode(message);

cell.appendChild(cell_data);

row.appendChild(cell);

return row;

}

</script>
</head>
<body>
<form id="form1" runat="server" >

<h1>Ajax Dynamic Update Example</h1>

This page will automatically update itself:

<p/>

Page will refresh in <span id="time">1</span> seconds.

<p/>

<tbody>

</tbody>

</table>
</form>
</body>
</html>

//Default2.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default2: System.Web.UI.Page
{
private static int counter = 1;

protected void Page_Load(object sender, EventArgs e)
{

String res = "";

String task = this.Request.Params["task"];

String message = "";

if (!string.IsNullOrEmpty(task))
{
if (task.Equals("reset"))
{
counter = 1;
}
else
{

switch (counter)
{

case 1: message = "Steve walks on stage"; break;

case 2: message = "iPods rock"; break;

case 3: message = "Steve says Macs rule"; break;

case 4: message = "Change is coming"; break;

case 5: message = "Yes, OS X runs on Intel - has for years"; break;

case 6: message = "Macs will soon have Intel chips"; break;

case 7: message = "done"; break;

}

counter ;

}
res = "<message>" message "</message>";

Response.ContentType = "text/Xml";

Response.AppendHeader("Cache-Control", "no-cache");

Response.Write("<response>");

Response.Write(res);

Response.Write("</response>");

Response.End();
}

}

分享：ASP.NET 2.0，無(wú)刷新頁(yè)面新境界
“無(wú)刷新頁(yè)面”，只是一種不確切的效果描述（其實(shí)還有其他各種方法來(lái)實(shí)現(xiàn)這個(gè)效果），更確切的說(shuō)法是：在頁(yè)面上用JavaScript調(diào)用服務(wù)器端的一個(gè)方法，然后處理返回的數(shù)據(jù)。實(shí)現(xiàn)它最標(biāo)