Setting PHP SESSION var from within JS

Question

Is there a way to set a session variable from withing my JS function?

I have the following JS code:

$.ajax({
    url: "ajax.php",
    type: "POST",
    data: { 
        tid: '.$testID.',
        do:"'.$do.'"
    },
    success: function( html ) {
        $("#partBox").html( html ); 
        // add PHP here?            
    }
});

I would like to set the following var in the session, on SUCCESS:

$_SESSION['hgt'] = 'Math.ceil($("#partBox").height() / 2)';

I have no idea if this is even possible... Alternatively I could probably use cookies...

John Conde · Accepted Answer · 2012-05-12 15:35:22Z

5

You can't set any PHP variables in JavaScript. Once the Page has finished loading PHP has done its job and is out of the picture. If you want to set a session variable using JavaScript you can do it one of two ways:

Use Ajax to send the value to a PHP script to set the session variable
Store it in a cookie and on the next page load have PHP use the value of that cookie to create the session varibale

answered May 12, 2012 at 15:35

John Conde

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4 Comments

santa Over a year ago

I need to capture this value into a session to use in cases where I have not received SUCCESS response. And how do I send it over again with AJAX? Do I put another ajax call withing SUCCESS section?

John Conde Over a year ago

That would be exactly where it goes

santa Over a year ago

Hmm, that sounds a bit more convoluted than I can handle. Can I set a cookie from withing SUCCESS area?

Ohgodwhy Over a year ago

To be honest; it's a best practice to use both cookies and session variables. Some users don't allow cookies.

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