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Posted by Erwin Moller on 11/23/06 11:07
Simon wrote:
> I have the following code in Javascript which is creating and sending
> an XMLHttpRequest .
>
> <code>
> var xmlHttp;
>
> /*@cc_on @*/
> /*@if (@_jscript_version >= 5)
> try {
> xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
> } catch (e) {
> try {
> xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
> } catch (e2) {
> xmlHttp = false;
> }
> }
> @end @*/
> alert(xmlHttp);
> if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
> xmlHttp = new XMLHttpRequest();
> }
>
> // Build the URL to connect to
> var url = "getURL.php";
>
> // Open a connection to the server
> xmlHttp.open("GET", url, true);
>
> // Setup a function for the server to run when it's done
> xmlHttp.onreadystatechange = updatePage;
>
> // Send the request
> xmlHttp.send(null);
>
> </code>
>
> The problem I am having is server side where I am trying to detect an
> Ajax request.
> I have the folowing function isAjax() which is returning false:
>
> <code>
> <?php
>
> if(isAjax()){
> echo "This is an Ajax request";
> }
> else{
> echo "Not Ajax";
> }
>
>
> function isAjax() {
> return isset($_SERVER['HTTP_X_REQUESTED_WITH']) &&
> $_SERVER ['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest';
> }
>
> ?>
> </code>
>
> Can someone tell me why isAjax() is failing here?
No I cannot, but why make life harder than needed?
Why rely on headers that may be filtered away or are not send by every
implementation of the Object?
If you want to tell if the request originated from AJAX, just add that to
the URL, that is 100% foolproof (I think).
Like:
var url = "getURL.php?originatedFromAjax=Y";
And simply check for it:
if (isset($_GET["originatedFromAjax"])){
// from AJAX
} else {
// Not from AJAX
}
Regards,
Erwin Moller
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