Touch.identifier

This is an experimental technology
Check 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

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support22 Yes

521

18 — 242

No No No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes6 Yes Yes ?

1. Touch events support has been fixed and reenabled in Windows desktop platforms.

2. Web compatibility issues seen in bug 888304.

Document Tags and Contributors

Last updated by: fscholz,