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Wondering if there's a way to detect a page load was done inside a frame, iframe, etc. (likely via JavaScript) and if so, what are the limits of such a detection system?

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up vote 6 down vote accepted
if (top.location.href != window.location.href) {
     alert("In A Frame");

The limit is if JavaScript is turned off it won't work.

You can also use the X-Frame-Options HTTP header. This header tells a web browser whether or not to allow a web page to be framed in another web page. This includes <frame> and <iframe> tags.

There are two possible values for this header:

DENY - This setting prevents any pages served from being placed in a frame even if it is on the same website it originates from. should be used if you never intend for your pages to be used inside of a frame.

SAMEORIGIN - This setting allows pages to be served in a frame of a page on the same website. If an external site attempts to load the page in a frame the request will be denied.

This header works in Internet Explorer 8.0, Firefox 3.6.9, Opera 10.50, Safari 4.0, and Chrome 4.1.

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+1 @John Conde: Nice clean code, thanks! – blunders Mar 23 '11 at 14:01
@blunder, No problem. Try using the header I just added, too, as it is a better way to do it and will compliment the JavaScript code nicely. (Assuming you are trying to block the content from being loaded in a frame that is). – John Conde Mar 23 '11 at 14:03
Thanks, John -- I had wondered if there was a header based detection system, selecting you as the answer. Cheers! – blunders Mar 23 '11 at 14:59
Note that the X-Frame-Options header may prevent some legitimate services such as Google Translate from working. See the following for further info: webmasters.stackexchange.com/questions/31287/… – snap Jul 14 '12 at 8:10

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