TouchEvent: changedTouches property
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The changedTouches read-only property is a TouchList whose touch points (Touch objects) varies depending on the event type, as follows:
- For the
touchstartevent, it is a list of the touch points that became active with the current event. - For the
touchmoveevent, it is a list of the touch points that have changed since the last event. - For the
touchendandtouchcancelevents, it is a list of the touch points that have been removed from the surface (that is, the set of touch points corresponding to fingers no longer touching the surface).
Value
A TouchList whose Touch objects include all the touch points that contributed to this touch event.
Examples
This example illustrates the TouchEvent object's TouchEvent.changedTouches property. The TouchEvent.changedTouches property is a TouchList object that contains one Touch object for each touch point which contributed to the event.
In following code snippet, the touchmove event handler iterates through the changedTouches list and prints the identifier of each touch point that changed since the last event.
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-touchevent-changedtouches |
Browser compatibility
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Legend
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- Full support
- Full support
- No support
- No support
- Has more compatibility info.