blueimp/jQuery-File-Upload — Issue #815: Script error when attempting to drag and drop in IE 9
Author: jamescrowley
Created: 2011-11-25 11:40:44+00:00
State: open

If I attempt to drag and drop a file over your upload demo page in IE 9, I get the following error:

Unexpected call to method or property access, on line 699.

You only see this when you are debugging (I guess drop/drag code swallows exceptions otherwise). The line is here:

dataTransfer.dropEffect = dataTransfer.effectAllowed = 'copy';

if I change it to

dataTransfer.dropEffect = 'copy';

then it works - so I guess effectAllowed is not permitted in IE?