- From: Ian Hickson <ian@hixie.ch>
- Date: Fri, 29 Apr 2011 23:16:57 +0000 (UTC)
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. `._.-(,_..'--(,_..'`-.;.'
Received on Friday, 29 April 2011 16:16:57 UTC