TouchEvent: touches property
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
touches is a read-only TouchList listing
all the Touch objects for touch points that are currently in contact
with the touch surface, regardless of whether or not they've changed or what their
target element was at touchstart time.
You can think of it as how many separate fingers are able to be identified as touching the screen.
Note:
Touches inside the array are not necessarily ordered by order of occurrences (the
i-th element in the array being the i-th touch that happened). You cannot assume a specific order. To determine the order of occurrences of the touches, use the touch object IDs.
Value
A TouchList listing all the Touch objects for touch points that are still in contact with the touch surface, regardless of whether or not they've changed or what their target element was at touchstart
time.
Examples
This example illustrates the TouchEvent object's
TouchEvent.touches property. The TouchEvent.touches
property is a TouchList object and containing a list of
Touch objects for every point of contact currently touching the surface.
In following code snippet, the touchstart event handler checks the length
of the TouchEvent.touches list to determine the number of touch points
that were activated and then invokes different handlers depending on the number of touch
points.
someElement.addEventListener("touchstart", (e) => {
// Invoke the appropriate handler depending on the
// number of touch points.
switch (e.touches.length) {
case 1:
handle_one_touch(e);
break;
case 2:
handle_two_touches(e);
break;
case 3:
handle_three_touches(e);
break;
default:
console.log("Not supported");
break;
}
});
Specifications
| Specification |
|---|
| Touch Events # dom-touchevent-touches |
Browser compatibility
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