This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for the proper prefixes to use in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the spec changes.
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 DOMString
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 | Editor's Draft | No change. |
Touch Events | Recommendation | Initial definition. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 22.0 | 18.0 (18.0) | Not supported | Not supported | Not supported |
Feature | Android | Android Webview | Chrome for Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | 6.0 (6.0) | (Yes) | 11 | (Yes) | (Yes) |