CODEWITHSUNDEEP
javascriptdom
Julius S.
Julius S.

Reputation: 704

How to get an "untouched" window object?

I have a bookmarklet that makes use of the window.open method.

Sometimes websites modify this method so I cannot predict the behaviour of running the bookmarklet.

Is there any way to get an "untouched" window object?

I tried injecting a new iframe and getting the window object from this but then chrome is blocking the popup (see https://bugs.chromium.org/p/chromium/issues/detail?id=932884).

window.open("http://example.com");

Upvotes: 0

Views: 83

Answers (1)

Soviut
Soviut

Reputation: 91525

You can check if the window.open method is native code or not by using .toString() and checking if [native code] is present.

window.open.toString()
// returns: "function open() { [native code] }"

window.open.toString().includes('[native code]')
// returns: true

window.open = function() { console.log('ding!'); }
window.open.toString().includes('[native code]')
// returns: false

Additionally, you can reasonably ensure .toString() hasn't been overridden by calling it from the prototype.

Function.prototype.toString.call(window.open).includes('[native code]')

Upvotes: 1

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