check if an opener exists

[Kor]

To check if a parent page exist is easy

if(parent.frames.length==0)

but it seems like if opener, the similar woun't work...

if(window.opener.length==0) gives errors

Any ideea how to check if an opener exists?

[swmr]

Remarks

The opener property is available only for frame and iframe pages.

Internet Development SDK

[swmr]

Actually, this seems to work: opener.closed

[joh6nn]

opener is a reference to the actual "window" object that opened the popup. opener.length, then, would be window.length, which isn't anything, so your if statement would always fail ( unless you've got some variable you named "length") as Swmr noted, the way to find out if the opener exists, is with the boolean closed property.

[Kor]

The opener property is available only for frame and iframe pages.

I don't think so... Maybe

The opener property is available only for pop-ups and other pages opened with a window.open() JS method.

For frame and iframe the reference is parent

[swmr]

Right, I realized that after remembering about the closed property; the quote I referred to must have been a mistake...

[Kor]

further more, opener... in fact window.opener is an object, not a property...

Now it looks like I have something:

if(opener && typeof opener.document != 'undefined')
{
// exists
}

I think this might be the answer

[swmr]

Originally posted by Kor
further more, opener... in fact window.opener is an object, not a property...

opener is a property of window.

closed is a property of opener.

... and, you're welcome.

[glenngv]

Originally posted by Kor
further more, opener... in fact window.opener is an object, not a property...

Now it looks like I have something:

if(opener && typeof opener.document != 'undefined')
{
// exists
}

I think this might be the answer

No.
Must be:

if(opener && !opener.closed)
{
// exists
}