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parent.document.getElementById from iFrame to parent not working

Posted on 2013-05-14
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Last Modified: 2013-05-14
An "onClick" call to a Javascript function to set the href of a button on a toolbar does not find the button when the call is made from an iFrame. The toolbar is in the main window.

alink = parent.document.getElementById('members_link');
or
alink = window.parent.document.getElementById('members_link');

This works when the link clicked is in the main window; it only fails when the link is in the iFrame.

I'm using Chrome, but also tested IE8.

Here's the menubar button:

<a id=members_link
      onClick=\"myLink='M'\"
      onmouseover=\"roll_over('members_button', 'images/menubar_Members_hi.jpg');\"
      onmouseout= \"roll_over('members_button', 'images/menubar_Members.jpg');\"
      href=\"directory.php\" target=main
      ><img class=menu_image src='images/menubar_Members.jpg' NAME=members_button></a>

The page only has this one iFrame.
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Question by:wilri01
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9 Comments
 
LVL 42

Expert Comment

by:Meir Rivkin
ID: 39163931
try this from inside the iframe:
var alink = parent.$(parent.document).getElementById('members_link');

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LVL 42

Expert Comment

by:Meir Rivkin
ID: 39164027
that might also work:
var alink = parent.$("members_link");

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Author Comment

by:wilri01
ID: 39164032
sedgwick,
What do I need to do to use JQuery?
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LVL 42

Expert Comment

by:Meir Rivkin
ID: 39164061
add this:
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

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Author Comment

by:wilri01
ID: 39164683
Sorry, but neither form works.
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LVL 22

Accepted Solution

by:
Kim Walker earned 2000 total points
ID: 39165960
The parent document and iframe document must be in the same domain for the child iframe document to access the parent DOM. It is considered a security issue when the documents are in separate domains.
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Author Comment

by:wilri01
ID: 39166437
Yes, I was aware of that, but it is the same domain.

BUT... you got me thinking.  I looked at how the link is being constructed for the button, and found it includes "www." and the URL I used to get ot the page left that off.

So I add "www." to the URL, and the Javascript code now works!

So the problem is, how can I tell if the user entered the "www.", or left it off?  Maybe use a relative HREF that doesn't include the domain name?

Maybe some kind of "rewrite" in Apache to add the "www." if it isn't entered?

God, I'm so happy to see this working at all!  THANK YOU SO MUCH!!!
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LVL 22

Expert Comment

by:Kim Walker
ID: 39166502
Can you use a relative url in the button link?
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Author Closing Comment

by:wilri01
ID: 39166892
The trick is to NOT include the "www." in the link.  Then the user can use, or not use, the "www." and it works.

I've been working on this off and on for almost a year.  It feels so good to see this work!
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