Im assuming the iFrame is on the same domain?
Does developer console say anything when trying this?
I tried several times yesterday to log on and let everyone know that I found a workaround. Stupid servers couldn't log me on.
Sadly, I will have to come back later to let everyone know how I did it. We were just informed yesterday that we have until COB tomorrow to vacate the room that we are in so another department can have it. So we are packing and moving.
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Sorry for taking so long to get back. As the department lead developer, department FACCSM, and department EC (Equipment Custodian), I had a lot of equipment and other things that demanded my attention during this move.
My workaround has only been tested in FireFox, but I'm about to test it in IE and Chrome.
What I was doing incorrectly was trying to use .onload and .onchange to detect when the file was done downloading.
My fix was to use:
This appears to be working.
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UPDATE: Sorry, I didn't answer your question. Yes, same domain. No error messages in dev con.