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<p class="style7"><SPAN class=style1>使用XmlHttp结合ASP实现网页的异步调用</SPAN></p>
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发布时间：2005-3-21 被阅览数：<SCRIPT src="../../counter.asp?id=373"></SCRIPT> 次 作者：断剑
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<td width="100%"><p class="style6">通过xmlHttp和ASP的结合，我们可以轻松完成网页的异步调用。 <BR>代码如下： <BR>1.新建Display.asp(这是前台显示页面) <BR>注意xmlhttp.readyState的4个属性 <BR>1:LOADING;2:LOADED;3:INTERACTIVE;4:COMPLETED <BR><BR><%@ Language=VBScript %> <BR><HTML> <BR><HEAD> <BR><META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0"> <BR></HEAD> <BR><script language="javascript"> <BR>xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); <BR>function fnDo(ID) <BR>{ <BR>var xmlDom = new ActiveXObject("Msxml2.DOMDocument"); <BR>var strURL = "GetInfo.asp?ID=" + ID; <BR><BR>xmlhttp.Open("POST",strURL , true); <BR>xmlhttp.onreadystatechange = fnRun; <BR><BR>xmlhttp.Send(xmlDom); <BR><BR>divTest.innerHTML = "Loading..." <BR>} <BR>//-------------------------------------------------------- <BR>function fnRun() <BR>{ <BR>var state = xmlhttp.readyState; <BR><BR>var xmlDom = new ActiveXObject("Msxml2.DOMDocument"); <BR><BR>if (state == 4) <BR>{ <BR>xmlDom.loadXML(xmlhttp.responseXML.xml); <BR>//alert(xmlDom.documentElement.selectSingleNode("//objXML").text) <BR>var getInfo = xmlDom.documentElement.selectSingleNode("//objXML").text; <BR>divTest.innerHTML = getInfo <BR>} <BR>} <BR></script> <BR><BODY> <BR><input type=button value="异步调用" onclick="fnDo(document.all.txtInput.value)"> <BR><input type=text id=txtInput> <BR><DIV id=divTest></DIV> <BR><BR><P> </P> <BR><BR></BODY> <BR></HTML> <BR>2.在建立GetInfo.asp(这是后台处理页面) <BR><% <BR>Dim sID,objResult <BR><BR>sID = Trim(Request("ID")) <BR>'sID = 28 <BR><BR>Set objResult = Server.CreateObject("MSXML2.DOMDocument") <BR>objResult.loadXML ("<objXML></objXML>") <BR>'************************************************************** <BR><BR>'************************************************************** <BR><BR>objResult.selectSingleNode("objXML").text = "Get:" & sID <BR><BR>Response.ContentType = "text/xml" <BR>objResult.save (Response) <BR>Response.End <BR><BR>Set objSch = Nothing <BR>Set objResult = Nothing <BR>%> <BR><BR>3.运行Display.asp页面，在文本框里输入内容，点击按钮，可以看到Loading的提示，随后在不刷新页面的情况下得到了文本框里的内容。当然你也可以在GetInfo.asp那个页面里根据发送的参数做一些复杂的出来，随后把结果返回出来。 </p>
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