Widget: ._on() equivalent of .one()

[nix]

It would be nice to have this so that, when hooking up a one-shot event, if the widget is destroyed before the event fires, the handler is removed.

Currently we'd have to call ._off() from the handler attached with ._on() to accomplish this.

[Scott González]

Can you provide some examples of when you need this?

[nix]

In mobile's fixedToolbar, we implement toolbars that are persistent across pages by hooking a one-shot handler to the next page's "pageshow" event and attach the header/footer there.

​https://github.com/jquery/jquery-mobile/blob/master/js/widgets/fixedToolbar.js#L159 (or look for '.one( "pageshow"' ).

Now, mind you, "pagebeforehide" is called shortly before "pageshow" for the next page, so chances are the .one() handler will indeed run, but there's still a possibility that the page will be destroyed before the next one shows.

[Scott González]

Is that the only place you would use it in jQuery Mobile? If so, I'm going to close as wontfix. While this case would be easy to handle, the case of using a named function reference via a string would not.

[nix]

I guess that's fine ...