This read-only property indicates the number of items (touch points) in a TouchList.
var numTouches = touchList.length;
numTouchestouchList.This code example illustrates the use of the TouchList interface's item method and the length property.
target = document.getElementById("target");
target.addEventListener('touchstart', function(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
var touch;
if (ev.targetTouches.length >= 1)
touch = ev.targetTouches.item(0);
else
touch = ev.touches.item(0);
}, false);
| Specification | Status | Comment |
|---|---|---|
| Touch Events – Level 2 | Editor's Draft | Non-stable version. |
| Touch Events | Recommendation | Initial definition. |
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Basic support | 22.0 | (Yes) |
18.0 (18.0)[1] 52.0 (52.0)[2] | No support | No support | No support |
| Feature | Android | Android Webview | Chrome for Android | Edge | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | 6.0 (6.0) | (Yes) | 11 | (Yes) | (Yes) |
[1] Touch events were implemented in Gecko 18.0, but removed again in 24.0 (Firefox 24.0 / Thunderbird 24.0 / SeaMonkey 2.21) on the desktop version of Firefox due to web compatibility issues (bug 888304).
[2] As of Gecko 52.0, touch events support has been fixed and reenabled in Windows desktop platforms.
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https://developer.mozilla.org/en-US/docs/Web/API/TouchList/length