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Window.parent is always undefined in an iframe

I recently ran into this weird problem, I was trying to reference the parent window in an iframe, but somehow window.parent or parent is always undefined.

I had a problem using window.top, but this question still haunts me.

Why is window.parent undefined?

It's a .NET web app if it helps.

Refresh . I would like to add that both parent and child iframes point to the same domain (localhost). As far as the code goes, I tried the following code:

if (parent != null)
{
  // do something
}

where something never happens, I also tried

alert(parent)

and

alert(window.parent)

they always come out as null.

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2 answers


Heck, this finally turned out to be a coding error - someone accidentally overridden the parent in another function:

parent = blah


while he had to use

var parent = blah
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Security - where IS window.parent ....



also checks the case of the property ... js is case sensitive ...

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