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"Assertion Failed" unwrapping event #636
Description
Activity
The issue is with document.body which cannot be wrapped due to this Safari bug: https://bugs.webkit.org/show_bug.cgi?id=122018
If you change it to document.querySelector('body').dispatchEvent it works: http://jsbin.com/gipunuhu/1/
Also, you might want to use
new MouseEventin the future to skip that ugly initMouseEvent crap: http://jsbin.com/gipunuhu/3/editSorry - the document.body element is actually a red herring in this case. The element I was dispatching the event on was hanging off of my custom elements
$property - but I can't seem to reproduce now. I'll re-open if I can
Abstract
I seem unable to simply instantiate an Event and dispatch it. Firefox throws an "Assertion Failed" error. This works fine in Chrome however (where I assume the ShadowDOM Polyfill is an effective no-op as Chrome already implements Shadow DOM).
Detail
I have polymer loaded, but I'm trying to manually instantiate a MouseEvent, and dispatch it to a regular DOM element - not involving Polymer. Because dispatchEvent and all of the event constructors have been overwritten, it goes through Polymer code.
I have a reduced test case available here.
document.createEvent('MouseEvent') creates me a GenericEvent from the ShadowDOM (see ShadowDOM events.js:L508-533. The problem seems to be dispatching the event, where an assertion fails in unwrap. The stack looks something like:
throw new Error('Assertion failed');(ShadowDOM wrapper.js:L33)assert()) (ShadowDOM wrapper.js:L31-34)isWrapper(event)(ShadowDOM wrapper.js:L326)isWrapper()) (ShadowDOM wrapper.js:L279-287)unwrap()) (ShadowDOM wrapper.js:L323-328)unwrap(event)(ShadowDOM:L763)dispatchEvent(event)) (ShadowDOM:L752-788).The conclusion of this is that the GenericEvent function does not return instances of the wrappers.* constructors - although I am sure the issue is more nuanced.