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POPost to iframe target: cannot get response from iframe
primarykey
Id
17684269
data
AcceptedAnswerId
0
AnswerCount
1
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-07-16T18:27:21.383
FavoriteCount
0
LastActivityDate
2013-11-21T12:01:53.283
LastEditDate
2017-05-23T10:30:06.870
LastEditorUserId
-1
OwnerUserId
984003
ParentId
0
PostTypeId
1
Score
2
ViewCount
4647
LastEditorDisplayName
text
Body
<p>I have a bookmarklet. When it is clicked (on any page):</p> <ol> <li>it inserts a script element with src from mypage.com. This src is downloaded.</li> <li>The src then: <ul> <li>inserts an iframe (DOM)</li> <li>inserts a form (DOM). The form targets the iframe.</li> <li>Adds data to the form and submits it to mypage.com </li> </ul></li> <li>mypage.com sends back a response: <code><div id = "msg">Message back</div></code></li> <li>This response div is inserted into the iframe. (verified in Chrome elements tab)</li> <li>Now I want to alert the returned msg "Message back". It's not working.</li> </ol> <p>When creating the iframe, I have set its <code>onload</code> event:</p> <pre><code>var i = document.createElement('iframe'); i.setAttribute('id', 'frame-id'); i.setAttribute('onload', 'iframeFormSubmitted();'); </code></pre> <p>I then have the function:</p> <pre><code>function iframeFormSubmitted(){ // in try-catch, alerting error var iframe = document.getElementById("frame-id"); var iframeDocument = iframe.contentDocument || iframe.contentWindow.document; var msg = iframeDocument.getElementById("msg").innerHTML; alert(msg); </code></pre> <p>}</p> <p>This ends up being called twice (first time, I think, because I also write the form to the iframe). The errors are:</p> <pre><code>cannot read property innerHTMl of null cannot call method getElementById of undefined </code></pre> <p>Edit: contentDocument is undefined. I'm thinking it's a cross domain thing: <a href="https://stackoverflow.com/questions/9451194/how-can-an-iframe-that-has-content-have-an-undefined-contentdocument-object">How can an iFrame that has content, have an undefined contentDocument object?</a></p>
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<javascript><forms><iframe>
Title
Post to iframe target: cannot get response from iframe
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. This table or related slice is empty.
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1. USuser984003
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PostsAcceptedAnswerId
1. This table or related slice is empty.
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1. PO
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  POPost to iframe target: cannot get response from iframe
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1. This table or related slice is empty.

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