Web/API/Touch/identifier

This is an experimental technologyCheck the Browser compatibility table carefully before using this in production.

The Touch.identifier returns a value uniquely identifying this point of contact with the touch surface. This value remains consistent for every event involving this finger's (or stylus's) movement on the surface until it is lifted off the surface.

Syntax

touchItem.identifier;

Return value

A long that represents the unique ID of the Touch object.

Example

someElement.addEventListener('touchmove', function(e) { 
// Iterate through the list of touch points that changed 
// since the last event and print each touch point's identifier. 
  for (var i=0; i < e.changedTouches.length; i++) { 
    console.log("changedTouches[" + i + "].identifier = " + e.changedTouches[i].identifier); 
  } 
}, false);

Specifications

Specification	Status	Comment
Touch Events – Level 2	Draft	No change.
Touch Events	Recommendation	Initial definition.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`identifier`	Chrome Full support 22	Edge Full support ≤18	Firefox Full support 52 Notes' Full support 52 Notes' Notes' Touch events support has been fixed and reenabled in Windows desktop platforms. No support 18 — 24 Notes' Notes' Web compatibility issues seen in bug 888304.	IE No support No	Opera Full support Yes	Safari No support No	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support 6	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes

Legend

Full support: Full support
No support: No support
See implementation notes.': See implementation notes.

Touch.identifier by Mozilla Contributors is licensed under CC-BY-SA 2.5.