Problem detecting an Ajax request

[Simon]

I have the following code in Javascript which is creating and sending
an XMLHttpRequest .

<code>
var xmlHttp;

/*@cc_on @*/
/*@if (@_jscript_vers ion >= 5)
try {
xmlHttp = new ActiveXObject(" Msxml2.XMLHTTP" );
} catch (e) {
try {
xmlHttp = new ActiveXObject(" Microsoft.XMLHT TP");
} 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("G ET", url, true);

// Setup a function for the server to run when it's done
xmlHttp.onready statechange = updatePage;

// Send the request
xmlHttp.send(nu ll);

</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_REQUEST ED_WITH']) &&
$_SERVER ['HTTP_X_REQUEST ED_WITH'] == 'XMLHttpRequest ';
}

?>
</code>

Can someone tell me why isAjax() is failing here?

[Erwin Moller]

Re: Problem detecting an Ajax request

Simon wrote:

I have the following code in Javascript which is creating and sending
an XMLHttpRequest .
>
<code>
var xmlHttp;
>
/*@cc_on @*/
/*@if (@_jscript_vers ion >= 5)
try {
xmlHttp = new ActiveXObject(" Msxml2.XMLHTTP" );
} catch (e) {
try {
xmlHttp = new ActiveXObject(" Microsoft.XMLHT TP");
} 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("G ET", url, true);
>
// Setup a function for the server to run when it's done
xmlHttp.onready statechange = updatePage;
>
// Send the request
xmlHttp.send(nu ll);
>
</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_REQUEST ED_WITH']) &&
$_SERVER ['HTTP_X_REQUEST ED_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?ori ginatedFromAjax =Y";

And simply check for it:
if (isset($_GET["originatedFrom Ajax"])){
// from AJAX
} else {
// Not from AJAX
}


Regards,
Erwin Moller

[Simon]

Re: Problem detecting an Ajax request

I found the answer, the Ajax request object has to have a custom HTTP
header. See the following link for more details:

http://www.sitepoint.com/print/painless-javascript-prototype

On Nov 24, 12:07 am, Erwin Moller
<since_humans_r ead_this_I_am_s pammed_too_m... @spamyourself.c omwrote:

Simon wrote:

I have the following code in Javascript which is creating and sending
an XMLHttpRequest .

>

<code>
var xmlHttp;

>

/*@cc_on @*/
/*@if (@_jscript_vers ion >= 5)
try {
xmlHttp = new ActiveXObject(" Msxml2.XMLHTTP" );
} catch (e) {
try {
xmlHttp = new ActiveXObject(" Microsoft.XMLHT TP");
} 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("G ET", url, true);

>

// Setup a function for the server to run when it's done
xmlHttp.onready statechange = updatePage;

>

// Send the request
xmlHttp.send(nu ll);

>

</code>

>

The problem I am having is server side where I am trying todetectan
Ajaxrequest.
I have the folowing function isAjax() which is returning false:

>

<code>
<?php

>

if(isAjax()){
echo "This is anAjaxrequest";
}
else{
echo "NotAjax";
}

>

function isAjax() {
return isset($_SERVER['HTTP_X_REQUEST ED_WITH']) &&
$_SERVER ['HTTP_X_REQUEST ED_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 fromAJAX, just add that to
the URL, that is 100% foolproof (I think).
>
Like:
>
var url = "getURL.php?ori ginatedFromAjax =Y";
>
And simply check for it:
if (isset($_GET["originatedFrom Ajax"])){
// fromAJAX
>
} else {
// Not fromAJAX
}Regards,
Erwin Moller

[Erwin Moller]

Re: Problem detecting an Ajax request

Simon wrote:

I found the answer, the Ajax request object has to have a custom HTTP
header. See the following link for more details:
>

http://www.sitepoint.com/print/painless-javascript-prototype

>

OK, good.
But why make things so hard?
And will it work for all implementations of XMLHTTPRequest?
WHy not simply add a name-value pair to the url?

Regards,
Erwin Moller

>
On Nov 24, 12:07 am, Erwin Moller
<since_humans_r ead_this_I_am_s pammed_too_m... @spamyourself.c omwrote:

>Simon wrote:

I have the following code in Javascript which is creating and sending
an XMLHttpRequest .

>>

<code>
var xmlHttp;

>>

/*@cc_on @*/
/*@if (@_jscript_vers ion >= 5)
try {
xmlHttp = new ActiveXObject(" Msxml2.XMLHTTP" );
} catch (e) {
try {
xmlHttp = new ActiveXObject(" Microsoft.XMLHT TP");
} 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("G ET", url, true);

>>

// Setup a function for the server to run when it's done
xmlHttp.onready statechange = updatePage;

>>

// Send the request
xmlHttp.send(nu ll);

>>

</code>

>>

The problem I am having is server side where I am trying todetectan
>Ajaxrequest.
I have the folowing function isAjax() which is returning false:

>>

<code>
<?php

>>

if(isAjax()){
echo "This is anAjaxrequest";
}
else{
echo "NotAjax";
}

>>

function isAjax() {
return isset($_SERVER['HTTP_X_REQUEST ED_WITH']) &&
$_SERVER ['HTTP_X_REQUEST ED_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
>implementati on of the Object?
>>
>If you want to tell if the request originated fromAJAX, just add that to
>the URL, that is 100% foolproof (I think).
>>
>Like:
>>
>var url = "getURL.php?ori ginatedFromAjax =Y";
>>
>And simply check for it:
>if (isset($_GET["originatedFrom Ajax"])){
> // fromAJAX
>>
>} else {
> // Not fromAJAX
>}Regards,
>Erwin Moller