Re: XMLHTTPRequest Oddity

Subject: Re: XMLHTTPRequest Oddity

From: Marc Tremblay <email@hidden>

Date: Sat, 14 May 2005 18:31:56 -0600

Delivered-to: email@hidden

Hi Michael,

I had the same problem and managed to remedy it by setting the If-Modified-Since header to force XMLHttpRequest to send the request to the remote server rather than fetching it from the cache (at least that's what I believe is happening).

Basically you want to add something like the following before the call to send.

xmlReq.setRequestHeader('If-Modified-Since', 'Wed, 15 Nov 1995 00:00:00 GMT');

See http://pansapien.com/?p=32 for full details.

Seems like this may be a bug with the XMLHttpRequest implementation in Safari 2.0, but I haven't checked into other implementations to know that this isn't just the way things work.

On 14-May-05, at 3:22 PM, Micheal Jones wrote:

Hi,

I can not seem to figure out why my XMLHTTPRequest when the function is called again.

The function in question is as follows:
function retrieve() {
xmlReq = new XMLHttpRequest();
var URL = ""http://www.url.com">http://www.url.com";

alert("XMLRequest");
xmlReq.open("GET", URL, true);
alert(xmlReq.readyState);
xmlReq. {
if (xmlReq.readyState == 4)
{
alert(xmlReq.readyState);
alert(xmlReq.status);
if(xmlReq.status != 200)
failLoad(xmlReq.status);
else {
var Source = xmlReq.responseText;
parse(Source);
}
}
}
xmlReq.send(null);
return 0;
}

When the widget first loads, this function is called and passes just fine.

However if I press a refresh button on my widget (I have not got around to implementing a timer yet as I want the widget to work first) the request will begin, but the xmlReq.status is returning undefined.

Would anybody know why that would be?

Thanks in Advance

Micheal
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References:

>XMLHTTPRequest Oddity (From: Micheal Jones <email@hidden>)