Question

I have

$('#myElem').mouseup(function(e){

  isMouseDown = false;

});

What I want to do is trigger a single event (e.g. an alert, or ++1 to a counter) only on the first of what might be a number of mousedown events.

Answer 1

If you have multiple bindings and are filtering, you can use event.stopPropagation within the event and stop it from going up the event list. Though it’s still not clear what you mean about “first of what might be a number of mousedown events”. (Bound to multiple selectors relating to same element, bound to children within a parent, …)

You can also use .one() and bind to an event only after a previous event has occurred. Likewise, you can add/remove binding based on specific events.