TouchEvent.changedTouches - Web APIs 编辑
The changedTouches
read-only property is 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).
Syntax
var changes = touchEvent.changedTouches;
Return value
changes
- A
TouchList
whoseTouch
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 iterates 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 | Draft | Non-stable version. |
Touch Events | Recommendation | Initial definition. |
Browser compatibility
BCD tables only load in the browser
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