Avoiding double-submit issues in change_form with a bit of JS

[adamJLev]

This makes the save form not submit twice, and disables the save buttons for a visual cue.

[darklow]

What if user hits ESC key while submit page is loading and stops request.
How can he resubmit the page with data he just entered?

1. I think this feature must be configurable.
2. Also it would be nice to control this feature per form/model. Therefore it would be better to add some special class for submit button like .btn-debounce and first do checking if form was submitted with button with such class. This would allow to add this feature just for few forms, where double submit is really bad thing.

[adamJLev]

I hear you. But even if the user hits ESC or "Stop" in the browser, the request went out and chances are that the object will be created/saved to the db. Stopping the request won't necessarily cancel the transaction.
So when they submit again, either it will save another item (dupe object), or get a duplicate key error, or maybe even do the "really bad thing" again.

I'd say that submitting a db form twice can never be a good thing, but maybe I'm missing something. Do you have an example?

I can definitely add a config param for this, but I believe it should be on by default :)

[adamJLev]

Just updated my fork slightly, the disabled html attribute was causing some logic to not work properly. that's fixed now.