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.
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.
A long
that represents the unique ID of the Touch
object.
js
someElement.addEventListener( "touchmove", (e) => { // Iterate through the list of touch points that changed // since the last event and print each touch point's identifier. for (let i = 0; i < e.changedTouches.length; i++) { console.log( `changedTouches[${i}].identifier = ${e.changedTouches[i].identifier}`, ); } }, false, );
Specification |
---|
Touch Events # dom-touch-identifier |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
identifier |
22 | ≤18 |
52This interface is only exposed if a touch input device is detected.18–24Removed in bug 888304 due to web compatibility issues. |
No | 15 | No | 4.4 | 25 | 6 | 14 | 10 | 1.5 |
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https://developer.mozilla.org/en-US/docs/Web/API/Touch/identifier