[whatwg] Mechanism to find available events
ian at hixie.ch
Fri Apr 29 16:16:57 PDT 2011
On Wed, 29 Dec 2010, Jorge wrote:
> On 29/12/2010, at 08:27, Ian Hickson wrote:
> > On Mon, 20 Sep 2010, Biju wrote:
> >> We need
> >> HTMLNode.getSupportedEvents() ==> returns a text array of event names
> >> HTMLNode.isSupportedEvent(eventName) ==> returns true/false
> >> Many times in particular version of browser we dont know whether an
> >> HTMLNode/window support particular event.
> >> Or what are the alternate events available, so that we can refer some
> >> document or do some test to find how it can be used.
> >> So I wish we had above methods available.
> > What do you mean by "supports an event"? You can dispatch any event you
> > want to any event target.
> It's not you, it's whether *the*browser* dispatches it. Say,
> oncontextmenu : "The code specified by this attribute is called when the
> associated element is right-clicked or when the mouse button is held
> down long enough to generate a contextual menu."
> How could your program detect, unequivocally, that the browser it's
> running in would dispatch an oncontextmenu when "the element is
> right-clicked or when the mouse button is held down long enough to
> generate a contextual menu" ?
> We need a mechanism to detect accurately the features of the browser our
> code's running in, without relying to UA sniffing madness.
No such mechanism can exist without actually using the feature, because
there's no way to guarantee that a browser will accurately report what it
supports. Every time we've had such a feature (e.g. DOM hasFeature())
vendors have ended up returning inaccurate values.
On Wed, 29 Dec 2010, Garrett Smith wrote:
> However, how can a program determine if a particular event is generated
> by the browser and fired at a particular object? The `("onhashchange" in
> window)` test should theoretically work, but as mentioned, that isn't
> interoperable at this point.
Neither is a mechanism to find out if an event is going to be fired. :-)
Let's get what we have already got implemented correctly before adding new
features that do more or less the same thing.
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
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