prevent xmlHttpReq 's browser caching

Question

It seems that all the browsers other than Opera cache XHR requests in my Javascript program. The URL in the XHR request refers to a CGI program on the server which generates a d

Answer 1

For every AJAX request you make, generate a unique value and add it to the ajax URL as a query parameter:

/example/url/post.php?rand=09809807896768

I use to generate the current unix timestamp in JS and use that - this ensures I do not get duplicated stamps.

That way every request is unique and will not get cached. This is a simple but fairly common AJAX trick - usually fixing IE and testing issues.

If you were to use jQuery, it does this for you by setting the property cache to false on the AJAX settings.