Thursday, 8 February 2007
Use PHP to Stop IE from Caching AJAX Requests |
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Justin Silverton in a new post over his blog tells you about an issue which he faced while working on a AJAX Project. The issue was that through a GET request when every time he tried to call a certain function, it was returning the same data.
He tried the following code in PHP, which disables the browser caching:
header( “Expires: Mon, 26 Jul 1997 05:00:00 GMT” );
header( “Last-Modified: ” . gmdate( “D, d M Y H:i:s” ) . ” GMT” );
header( “Cache-Control: no-cache, must-revalidate” );
header( “Pragma: no-cache” );
But he says the result did not change and he finally came to the following solutions.
- use a POST request. When using with
xmlhttprequest, it is slightly more complicated - add a unique identifier to the end of my GET URL
He chooses the second option. A unique Identifier can be created using the current data+time he says. He shows a way in the following to generate this in JavaScript:
var date = new Date();
var timestamp = date.getTime();
createXMLHttpRequest();
xmlHttp.onreadystatechange = handleMessages;
xmlHttp.open(”GET”,”script.php?time=”+timestamp,true);
xmlHttp.send(null);
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Read the Post
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