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#11934 closed feature (wontfix)

Opened June 19, 2012 08:32PM UTC

Closed October 29, 2012 05:04PM UTC

Last modified November 27, 2012 05:40PM UTC

Enhancement: allow ":once" on event names to indicate one() variant event binding

Reported by: getify Owned by:
Priority: low Milestone: None
Component: event Version: 1.7.2
Keywords: 1.9-discuss Cc:
Blocked by: Blocking:

I am a big fan of the "one()" functionality. But I have a suggestion for a small piece of sugar to extend it:

Allow me to put ":once" on the end of any event name in any of the event binding APIs (bind, on, etc) which tells jQuery to use the "one()" variant for the binding of that particular event. For example:

// vs. $("a").one("click",handle)

$("#foobar").on("mousedown:once mouseup","a",handle)
// vs. $("#foobar").one("mousedown","a",handle).on("mouseup","a",handle)
Attachments (0)
Change History (11)

Changed June 23, 2012 01:39PM UTC by dmethvin comment:1

component: unfiledevent
keywords: → 1.9-discuss
milestone: None1.9
priority: undecidedlow
status: newopen
type: enhancementfeature

There might be a case to be made for a CSS-selectors-like handling of the event string, but I'm not a fan of making an exception for ":once" alone. Also, many external users are now using the ":" character in their custom event strings so we would need to be very careful about creating compatibility issues. I'll mark it for 1.9 discussion.

Changed June 23, 2012 01:45PM UTC by getify comment:2

FWIW, Mootools has a whole system of "Event Pseudos", including ":once"...

Perhaps that's a pattern jQuery could consider for this.

Changed September 24, 2012 05:08PM UTC by dmethvin comment:3

-1, This doesn't fit in at all with our string event syntax, and the colon char is used by frameworks.

Changed September 24, 2012 05:13PM UTC by mikesherov comment:4

-1, Seems almost too late for jQuery to do this now.

Changed September 27, 2012 12:22PM UTC by gibson042 comment:5

-1, I'd rather not mix extra logic into event type.

Changed October 14, 2012 10:29PM UTC by mikesherov comment:6


Changed October 14, 2012 11:24PM UTC by rwaldron comment:7

-1, No new custom selectors. No new event system complexities

Changed October 22, 2012 05:18PM UTC by gibson042 comment:8


Changed October 22, 2012 05:26PM UTC by gnarf comment:9

-1, Dave brings up points I agree with

Changed October 29, 2012 05:04PM UTC by mikesherov comment:10

resolution: → wontfix
status: openclosed

Changed November 27, 2012 05:40PM UTC by dmethvin comment:11

milestone: 1.9None