javascript authorization for iframes

I am currently working on a localhost webpage (parent) that includes an iframe displaying content from another url (child; part of a different webapp also on localhost).

My goal is to use JavaScript on the parent-page to inspect the contents of the iframe, specifically looking for a list of items. If this list is empty, I want to hide the entire iframe.

The issue arises when attempting to access the element iframe.contentDocument.body. In Firefox, I receive the error message: Permission denied to access property 'body'

In Internet Explorer, the error simply states: Error: 'body' is null or not an object.

If anyone has any suggestions on how to work around this problem, it would be greatly appreciated.

Thank you,

Answer №1

There are a couple of solutions that have been suggested for handling the error where body returns null in code. One option is to place your script at the end of the body element so that it doesn't run before the body has fully loaded. However, using inline scripts is generally frowned upon by developers.

Another approach mentioned on this page involves utilizing an onload function for the body, ensuring that the body element exists before executing the function.

Both methods seem to be equally effective in resolving the issue.

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