ElementEvents.subscribe set useCapture to true by default, which is not standard

[sebastien-roch]

I'm submitting a bug report

• Library Version:
  master

• Language:
  all

Current behavior:
When using EventElements.subscribe, the listener will be set with useCapture = true, which is not the standard behavior of the native addEventListener() function and thus confuses the developer.

• What is the expected behavior?
  EventElements.subscribe (and subscribeOnce) should use set useCapture to false by default.

• What is the motivation / use case for changing the behavior?
  Mimic native API of the browser: addEventListener would set useCapture to false if not passed in arguments.

[bigopon]

@sebastien-roch I've been hit by this as well. It's unfortunate, but we can only fix this in a major release of templating.

cc @EisenbergEffect

[EisenbergEffect]

Sadly, we can't change it at this point because it could potentially break existing apps. What if we had some setting that could be set to get the desired behavior though, in a non-breaking way?

[bigopon]

@EisenbergEffect We cna do that via a static field on ElementEvents class, say defaultListenerOptions

[EisenbergEffect]

That works for me. @sebastien-roch Would you be interested in adding this property and updating the implementation to use it? I think it would make a fine contribution and we'd be very happy to work with you to get your PR in. Thoughts?

[sebastien-roch]

I can do that. Towards which branch should I target my pull request having this defaultListenerOptions? I guess I have to create a second PR for a future breaking release where we just set capture to false by default.

[bigopon]

@sebastien-roch Thanks for that. It should be develop branch