以为我会报告我的发现,现在我已经全部工作了。以下客户端代码(略有删节和匿名)包含解决此线程中概述的问题所需的所有变通方法,并且适用于 IE (8.0.6001)、FF(3.5.9) 和 Chrome (5.0. 375.55 测试版)。还没有在旧版本的浏览器下测试。非常感谢所有回复的人。
我还应该补充一点,我需要确保服务器响应需要包括:
Response.ContentType = "text/xml" ;
让它与 IE 一起工作。FF 不介意 ContentType 是否为 text/HTML 但 IE 咳嗽。
创建 XMLHTTP 请求的代码:
function GetXMLHTTPRequest ()
{
var activexmodes=["Msxml2.XMLHTTP", "Microsoft.XMLHTTP"] ; //activeX versions to check for in IE
if (window.ActiveXObject) //Test for support for ActiveXObject in IE first (as XMLHttpRequest in IE7 is broken)
{
for (var i=0; i < activexmodes.length ; i++)
{
try
{
return new ActiveXObject(activexmodes[i]) ;
}
catch (e)
{ //suppress error
}
}
}
else if (window.XMLHttpRequest) // if Mozilla, Safari etc
{
return new XMLHttpRequest () ;
}
else
{
return (false) ;
}
}
返回记录节点的文本值的代码:
function GetRecordElement (ARecordNode, AFieldName)
{
try
{
if (ARecordNode.getElementsByTagName (AFieldName) [0].textContent != undefined)
{
return (ARecordNode.getElementsByTagName (AFieldName) [0].textContent) ; // Chrome, FF
}
if (ARecordNode.getElementsByTagName (AFieldName) [0].text != undefined)
{
return (ARecordNode.getElementsByTagName (AFieldName) [0].text) ; // IE
}
return ("unknown") ;
}
catch (Exception)
{
ReportError ("(GetRecordElement): " + Exception.description) ;
}
}
执行 AJAX 请求的代码:
function GetRecord (s)
{
try
{
ReportStatus ("") ;
var xmlhttp = GetXMLHTTPRequest () ;
if (xmlhttp)
{
xmlhttp.open ("GET", "blahblah.com/AJAXget.asp?...etc", true) ;
if (xmlhttp.overrideMimeType)
{
xmlhttp.overrideMimeType("text/xml") ;
}
xmlhttp.setRequestHeader ("Content-Type", "text/xml; charset=\"utf-8\"") ;
xmlhttp.onreadystatechange = function ()
{
if (xmlhttp.readyState == 4)
{
if (xmlhttp.responseXML != null)
{
var xmlDoc = xmlhttp.responseXML;
var ResultNodes = xmlDoc.getElementsByTagName ("Result") ;
if (ResultNodes != null)
{
var PayloadNode = xmlDoc.getElementsByTagName ("Payload") ;
if (PayloadNode != null)
{
var ResultText = ResultNodes [0].firstChild.nodeValue ;
if (ResultText == "OK")
{
ReportStatus (ResultText) ;
var RecordNode = PayloadNode [0].firstChild ;
if (RecordNode != null)
{
UpdateRecordDisplay (RecordNode) ; // eventually calls GetRecordElement
}
else
{
ReportError ("RecordNode is null") ;
}
}
else
{
ReportError ("Unknown response:" + ResultText) ;
}
}
else
{
ReportError ("PayloadNode is null") ;
}
}
else
{
ReportError ("ResultNodes is null") ;
}
}
else
{
ReportError ("responseXML is null") ;
}
}
else
{
ReportStatus ("Status=" + xmlhttp.readyState) ;
}
}
ReportStatus ("Requesting data ...") ;
xmlhttp.send (null) ;
}
else
{
ReportError ("Unable to create request") ;
}
}
catch (err)
{
ReportError ("(GetRecord): " + err.description) ;
}
}