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Summary

A TouchList whose touch points (Touch objects) varies depending on the event type, as follows:

  • For the touchstart event, it is a list of the touch points that became active with the current event.
  • For the touchmove event, it is a list of the touch points that have changed since the last event.
  • For the touchend event, 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).

This property is Read only .

Syntax

var changes = touchEvent.changedTouches;

Return value

changes
A TouchList whose Touch objects include all the touch points that contributed to this touch event.

Example

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 iterrates through the changedTouches list and prints the identifier of each touch point that changed since the last event.

someElement.addEventListener('touchmove', function(e) {
   // Iterate through the list of touch points that changed
   // since the last event and print each touch point's identifier.
   for (var i=0; i < e.changedTouches.length; i++) {
     console.log("changedTouches[" + i + "].identifier = " + e.changedTouches[i].identifier);
   }   
}, false);

Specifications

Specification Status Comment
Touch Events – Level 2 Editor's Draft Non-stable version.
Touch Events Recommendation Initial definition.

Browser compatibility

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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 最終更新者: erikadoyle,