Mobile Safari - “touchend” event not firing when last touch is removed?

Question

The \"gesture\" I\'m trying to capture is a tap when but only when an element (other or same) already has a touch on it. So, touch (1) presses the button down while touch (2

Answer 1

TouchEvent of the type touchend always have e.touches.length of 0

The missing last touchend event could be dependent on the targets of the touches. If both fingers lift at the same time AND both have the same target then only one touchend will fire, but it will have both touches in the e.changedTouches object. If the targets are different then you will see two touchend events, each with the associated touch in the changedTouches object.

Furthermore, and most puzzling, is that when you lift one of two fingers you will get the same behavior as if you had lifted both. Then when the remaining finger moves it will fire another touchstart, with that finger's original identifier in the touches. The result is that there is no way to tell at the time of the touchend which touch has ended until after an arbitrary amount of time (when the remaining finger moves).

To verify this you need to document the touchLists in each event. The only workaround I found is a cludge where I cache the touchstart events, setInterval for half a second, then hope that the remaining finger has fired a touchstart I can use to reconcile the state. Good Grief!