Touch: identifier property
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
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The identifier read-only property of the Touch interface 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.
Value
A long that represents the unique ID of the Touch object.
Examples
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}`,
);
}
});
Specifications
| Specification |
|---|
| Touch Events # dom-touch-identifier |