The length
read-only property indicates the number of items (touch points) in a given TouchList
.
The length
read-only property indicates the number of items (touch points) in a given TouchList
.
The number of touch points in touchList
.
This code example illustrates the use of the TouchList
interface's item
method and the length
property.
js
const target = document.getElementById("target"); target.addEventListener( "touchstart", (ev) => { // If this touchstart event started on element target, // set touch to the first item in the targetTouches list; // otherwise set touch to the first item in the touches list const touch = ev.targetTouches.length >= 1 ? ev.targetTouches.item(0) : ev.touches.item(0); }, false, );
Specification |
---|
Touch Events # dom-touchlist-length |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
length |
18 | ≤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 | 18 | 6 | 14 | 2 | 1.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/TouchList/length