php variable to know when jquery has loaded?

I know you can get a $_SERVER['HTTP_X_REQUESTED_WITH'] php variable if jquery has loaded. That's great but if you use an iframe then that variable is no longe开发者_如何转开发r available. Is there a way to detect if jquery has loaded and give php a varaible in an iframe? I don't want to load a header or footer if jquery has loaded 100% but otherwise put them on. I have to use an iframe so there is no way around that. (I'm using a Colorbox iframe).

Thank you.

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This approach seems error-prone. Do you have a good reason for waiting until jQuery has loaded before loading the header and footer? Are these actions that could be performed client-side via jQuery's AJAX functions?

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I know you can get a $_SERVER['HTTP_X_REQUESTED_WITH'] php variable if jquery has loaded.

That's not what that variable indicates.

That variable indicates that a particular request was made with jQuery's AJAX functions.

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You probably want to hide the content with CSS using "display:none;" when Colorbox is enabled, You'd be still loading the footer and header but they won't show up

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PHP => Browser => Javascript

You can't communicate from javascript to php such that php would genereate different data based on javascript.

You can do a documentReady() to hide a div when jquery is loaded.