Error Access is denied error on accessing iframe document object

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For posting AJAX forms in a form with many parameters, I am using a solution of creating an iframe, posting the form to it by POST, and then accessing the iframe's content. specifically, I am accessing the content like this:

$("some_iframe_id").get(0).contentWindow.document

I tested it and it worked.

On some of the pages, I started getting an "Access is denied" error. As far as I know, this shouldn't happen if the iframe is served from the same domain.

I'm pretty sure it was working before. Anybody have a clue?

Jun 19, 2020 in Java-Script by kartik
• 37,500 points
978 views

1 answer to this question.

0 votes

Hii @kartik,

The problem was that even though the correct response was being sent (verified with Fiddler), it was being sent with an HTTP 500 error code (instead of 200).

So it turns out, that if a response is sent with an error code, IE replaces the content of the iframe with an error message loaded from the disk (res://ieframe.dll/http_500.htm), and that causes the cross-domain access denied error.

Hope this is helpful!!

answered Jun 19, 2020 by Niroj
• 82,740 points

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