This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The Touch.identifierreturns 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.
touchItem.identifier;
A long that represents the unique ID of the Touch object.
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); | Specification | Status | Comment |
|---|---|---|
| Touch Events – Level 2 | Editor's Draft | No change. |
| Touch Events | Recommendation | Initial definition. |
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Basic support | 22.0 | (Yes) |
18.0 (18.0)[1] 52.0 (52.0)[2] | No support | No support | No support |
| Feature | Android | Android Webview | Chrome for Android | Edge | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | 6.0 (6.0) | (Yes) | 11 | (Yes) | (Yes) |
[1] Touch events were implemented in Gecko 18.0, but removed again in 24.0 (Firefox 24.0 / Thunderbird 24.0 / SeaMonkey 2.21) on the desktop version of Firefox due to web compatibility issues (bug 888304).
[2] As of Gecko 52.0, touch events support has been fixed and reenabled in Windows desktop platforms.
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Touch/identifier