Ajax - Cache Busting with Javascript
Browsers are notorious at hanging on tenaciously to cached pages. Even
when you use all manner of fancy headers like "Pragma:
no-cache" or "Cache-Control: must-revalidate"
you'll often find that you receive a cached page rather than a 'live' one.
Here's something else you can try, which has worked well for me:
To the URL which requests the page, add a random (and meaningless) variable
and value pair. The value should be different each time, and although it
will have no effect on the called page, it helps to fool the browser into
thinking it has to return a page from a URL it's never visited before, rather
than realising it has it in cache.
A good way to do this in Javascript is to add a random number:
<![CDATA[
var myurl='http://www.mydomain.com/data.php';
myRand=parseInt(Math.random()*99999999); // cache buster
window.open(myurl + "?rand=" + myRand,"mywindow","status=1,toolbar=1");
]]>
Now, each time we open the page whose address is stored in myurl, we append a meaningless variable rand with a random value, eg:
<![CDATA[
www.mydomain.com/data.php?rand=54321</FONT></P>
]]>
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