Can I block _parent attribute?

**Alan22** · May 9, 2011 08:19

Hi,

I was wondering if is it possible to prevent a form in iframe submitting to it's _parent page and force it to submit to iframe instead?

Please see my example below:

http://server-a/page1.html:

Code HTML4Strict:

<html><body>
Content of page 1
 
<iframe src="http://server-b/form.html" width="450" height="500">
  <p>Your browser does not support iframes.</p>
</iframe>
 
</body></html>

http://server-b/form.html:

Code HTML4Strict:

<html><body>
<form action="http://server-a/landing.cgi" target="_parent">
<input type="hidden" name="field1" value="val1" />
<input type="submit" value="Submit" />
</form>
</body></html>

At the moment when form is submitted, output of http://server-a/landing.cgi overwrites http://server-a/page1.html. What I a am looking for is some clever JavaScript to block target="_parent" attribute somehow and force http://server-a/landing.cgi to stay in iframe.

Thanks

**paul_wilkins** · May 9, 2011 20:11

Could you give a name to the iframe, and give that name to the target attribute? No scripting required, or needed even.

**Alan22** · May 9, 2011 22:24

Hi Paul, many thanks for your reply.

Unfortunately I have no control over http://server-b/form.html

I can only manage http://server-a/...

So my idea was to use 'onbeforeunload' or similar to solve this problem. Not sure how this could be exactly done though.

**paul_wilkins** · May 9, 2011 23:55

Originally Posted by Alan22

So my idea was to use 'onbeforeunload' or similar to solve this problem. Not sure how this could be exactly done though.

onbeforeunload only allow you to show a message to the user, where they can choose to stay on the page or allow the new page to load.
For an example, see: onbeforeunload Demo

I don't think that web browsers allow you to have the control that you seem to need, over an iframe from another domain.

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