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How to allow a cross domain page to access (and modify) my form fields?

Posted on 2008-10-21
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Last Modified: 2012-06-27
I got two pages:

* A.jsp has an html form named "iForm" with address fields and a popup link to B.jsp

* B.jsp allows the user to select an addressID value and use that value to populate iForm.addressID by doing:

   window.opener.document.forms['iForm'].addressID.value = selectedValueFormPopup;

So far everything's fine and dandy.

However, when A.jsp resides on a different server, I get a security error message:

"permission denied to get property Window.document"

How can I allow B.jsp access to fields on A.jsp?

(I know I can pass JSON messages to A.jsp via its url query string, but that is not the preferred method).

Help much appreciated.
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Question by:coniglio14
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6 Comments
 
LVL 75

Expert Comment

by:Michel Plungjan
ID: 22775779
1. use url (you said no)
2. use a javascript residing on server A in page from server B
3. call the server A's pages from server B and present as server B's page


So if you in page A load a javascript from server B, this script can fill in the form:
http://ajaxpatterns.org/On-Demand_Javascript

function ensureUploadScriptIsLoaded() {
   if (self.uploadScript) { // Already exists
     return;
   }
   var head = document.getElementsByTagName("head")[0];
   script = document.createElement('script');
   script.id = 'uploadScript';
   script.type = 'text/javascript';
   script.src = "http://www.serverB.com/formfill.jsp?parameter="+parms;
   head.appendChild(script);
 }

Open in new window

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Author Comment

by:coniglio14
ID: 22776702
Tried your solution number 2:

A.jsp sits on server A and has form "iForm" whose fields are to be populated (A.jsp has not changed).

Now B.jsp (the adress lookup popup residing on server B) calls the "populateClientForm()" function from a javascript file residing on server A:


// in B.jsp
<script src="http://serverA.com/scripts/populate.js"></script>
...
<input type="button" onclick="populateClientForm(adressID)" value="Populate form"/>
...

However I still get the same security error message ("permission denied to get property Window.document").

Am I missing a step here?

Thanks!
C14

(In the mean time I'll attempt your solution number 3)
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LVL 75

Expert Comment

by:Michel Plungjan
ID: 22776994
Yes, you missed something or I was not clear

A.jsp on serverA has a form.
B.jsp on serverB has some data
You need A.jsp to contact serverB which has the data - to load a JS file - which can be a jsp setting the header
content-type:text/javascript

This file can then do

document.forms[0].addressId.value='<%=addressId %>'


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Author Comment

by:coniglio14
ID: 22845734
I decided to use the the URL to pass parameters, or more specifically the hash portion of the URL, e.g. "http://serverA/myContext/A.jsp#paramString".

This is what B.jsp (sitting on server B) is doing:

   window.opener.location.hash=myParameters;

Then A.jsp reads and processes those parameters.

This works fine, but only in FireFox, not in IE.

How can I fix this security problem in IE?

Thanks much!

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LVL 75

Accepted Solution

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Michel Plungjan earned 2000 total points
ID: 22848646
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Author Closing Comment

by:coniglio14
ID: 31508526
Thanks a lot!
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