Passing additional options to addEventListener

[monstasat]

For now there is no way to pass additional options to addEventListener method of eventTarget class. Js_of_ocaml only provides old-fashioned signature for addEventListener, where only useCapture flag can be passed. Here are the docs for options that can be passed to addEventListener. IMO, at least passive option should be also added to jsoo bindings (Dom, Dom_html, and Lwt_js_events modules).

Are there any reasons why this is still not a part of jsoo? Would you accept a PR if I implement this feature?

[monstasat]

I've noticed that a corresponding PR (#807) already exists.
However, it lacks updates for Lwt_js_events modules.
As @FacelessPanda mentions in his PR, options can be passed to addEventListener as a single object or as optional arguments. I think passing optional arguments is a better option, as we can check browser support for additional options like passive and once and ignore them if not supported.
As for the Lwt_js_events module, the once option seems redundant because event listener is added once again after every event occurrence, so we may need to add only passive and use_capture optional arguments to existing functions.

[hhugo]

#807 has been merged. PR welcome to add the corresponding feature in Lwt_js_events.

[monstasat]

PR #866 implements the passive feature for Lwt_js_events.