v-on and 'return false' about discussion

[yyx990803]

v-on passes your handler return value on to the raw event handler, so the result will be consistent with the browser behavior.

[gaydenko]

I guess, this contract is accepted by jQuery and others libs/frameworks (just as type saver).
Sorry, I don't see a reason of passing return value further. I was sure an event handler is just a case of side effect. Am I wrong?

[yyx990803]

Your handler will be wrapped inside another function (which is the actual listener attached to the DOM), and this wrapper function returns whatever is returned from your handler function.

In general, I try to keep Vue handlers' behavior consistent with native behavior, because not everyone expects Vue to work like jQuery.

[gaydenko]

I guess the contract is shared by almost all widely used frameworks (probably jQuery was just a source of the agreement). OK, closing. I"m agree, the intention to have more clearness is almost always the best :)

[gaydenko]

Just for information. It is funny, suggested behavior isn't a common practice only, it is an official recommendation also. From here [1]:

"If return value is a Web IDL boolean false value, then cancel the event."

So it is browsers who are still lazy to implement both standard de facto and official recommendations. OTOH as far as browsers (still) treat event handler as pure side effect, any selected behavior will be consistent with this browsers' treatment.

[1] http://www.w3.org/html/wg/drafts/html/master/webappapis.html#the-event-handler-processing-algorithm