Request: support for passive events about tko HOT 7 CLOSED

Good idea, thanks for suggesting.

I like the short hand (passiveEvent binding handler) and

<div data-bind="event: {wheel: handleWheel, passive: true}"></div>

Of course we get a name collision of passive... Will think about that. :)

from tko.

Look again :) no conflict, since the value for wheel is an object: wheel: {handler: handleWheel, passive: true}

from tko.

I feel like there's too much room for spelling errors, too much typing, and too many brackets in the more generic version. I'd like to also include some sort of capture:true option, and maybe stopPropagation and preventDefault.

Some suitable syntaxes might be (for passive + capture):

<div data-bind='event: {wheel+passive+capture: handleWheel}'></div>
<div data-bind='event.wheel+passive+capture: handleWheel}'></div>
<div data-bind='event.wheel: handleWheel+passive+capture}'></div>

<!-- or, adding all options -->
<div data-bind='event.wheel: handleWheel+passive+capture+preventDefault+stopPropagation}'></div>

How do they look / feel?

A new syntax, absent rewriting for KO3, will not be backwards compatible.

from tko.

This doesn't look like valid JS. For me the charme of knockout's data-bind is the appearance of natural JS objects inside the attribute value, and I would want to keep that. Taking your answer into account, I would suggest eventPassive: ... as a bindingHandler, since it doesn't provoke spelling errors (at least not more than the ordinary event handler would do), and it is meaningful.

from tko.

Yeah, that's a good point.

The issue with passiveEvent is that it doesn't work for a larger set of options e.g. passive + capture: eventPassiveCapture?

It might be that the correct way is, as you suggested, the wheel: {handler: wheelHandler, passive: true, capture: false}.

Mulling it. :)

from tko.

It might be that the correct way is, as you suggested, the wheel: {handler: wheelHandler, passive: true, capture: false}.

Probably :-/
Your only objection would be the error-prone-ness (e.g. typos)?

from tko.

This will be in beta-1

from tko.