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Archived Message:

ebooks and cross-domains


 
mythos
Here are sore details about ebooks and the cross-domain access denied problem. This is not specific to Activ Ebook, but it has to do with cross-domain access prevention: Let's say you have a form in your ebook that you want to interact with an external web page in an iframe of your ebook. Clicking a button in the external web page will change the value of a form field in your ebook. One would think that if the domain or external site is yours, you can create a web page to recognize and interact with your ebook. But you can't with scripting, because the ebook is considered a cross-domain location, and you will probably get 'access denied' errors if you try to transfer data with a script from your external web page to your ebook:

-------------------------------------------------------------------------------------------------------

iFRAME 1
--------------------------------------------

____Get variable A____                      --  a form field

--------------------------------------------

iFRAME 2
--------------------------------------------

_Set variable A__

_spare parts_
___________
__database__

[]                               [][][]                    -- a button

--------------------------------------------------------------------------------------------------------

iFrame 1 is an internal ebook page. iFrame 2 is an external (cross-domain) web page. Because iFrame 2 contains a database it is way too large to compile into the ebook itself. It must remain external. The user selects an item from the database and then clicks on a button which sends his selection as 'variable A' to a form field in iFrame 1. The rest of the ebook uses 'variable A' for various processes.

The only cross-domain work-around I can immediately think of is:  

script in iFrame 1 =
'mouseover' event handle: when the cursor moves into the iFrame 2 cross-domain, the clipboard value is ""

script in iFrame 2 =
copy 'variable A' value to the clipboard when the button is clicked on.

script in iFrame 1 =
'mouseout' event handle: when the cursor moves out of the iFrame 2 cross-domain, if the clipboard value is not "" it is pasted into the form field of iFrame 1.

------------------------------------------------

Anyway, it works. Newbies can get cross-domain data into ebooks with just one click (provided the ebook author is the webmaster or owner of the external site and can modify it). But I wonder, could my external webpage send activ variables to  window.external.ActivSet  easier and without having 'access denied'?


Posted on: 1:59 pm on April 25, 2006
mythos I meant "some" details not sore...

Posted on: 2:24 pm on April 25, 2006
Storyman sore/meant

A freudian slip perhaps? LOL


Posted on: 4:18 pm on April 25, 2006

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