How to detect iframe load failure in an ionic application - angularjs

In my ionic application I need to show external website which I show in an iFrame.
While the website is fetched and loaded I show loading spinner. I want to hide it once the iframe/website is loaded and it it fails then I need to show a button saying "Launch in an external browser". So the question is how to check if iframe website load is failed in an IONIC app.

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