Detect iFrame embedding in Javascript

I have an application that has a certain page -- let's call it Page A. Page A is sometimes a top-level page, but also sometimes is embedded as an iframe within page B. All pages come from the same server and there are no cross-domain issues.

I have a greasemonkey script that runs on page A. How can the greasemonkey script detect whether page A is within the iframe context or not?

Answers:

Answer

Looking at frame length breaks down generally if page A itself has frames (I know this might not be the case for this specific instance). The more reliable and meaningful test would be:

if (window!=window.top) { /* I'm in a frame! */ }
Answer

The predicate

(window.parent.frames.length > 0)

will tell you just what you want.

Answer

As stated above the accepted solution doesn't work in IE8. Additionally, checking window.parent.frames.length can cause a cross-domain exception.

Instead I was able to achieve this with var isInIFrame = top.location != self.location - it works in IE8 and it doesn't cause a cross-domain violation as long as you don't attempt to read the contents of top.location.

Answer

Use window.frameElement and check if it is not null and if its nodeName is "IFRAME".

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