TouchList
The TouchList
interface represents a list of contact points on a touch surface. For example, if the user has three fingers on the touch surface (such as a screen or trackpad), the corresponding TouchList
object would have one Touch
object for each finger, for a total of three entries.
This interface was an attempt to create an unmodifiable list and only continues to be supported to not break code that's already using it. Modern APIs represent list structures using types based on JavaScript arrays, thus making many array methods available, and at the same time imposing additional semantics on their usage (such as making their items read-only).
These historical reasons do not mean that you as a developer should avoid TouchList
. You don't create TouchList
objects yourself, but you get them from APIs such as TouchEvent.targetTouches
, and these APIs are not deprecated. However, be careful of the semantic differences from a real array.
Instance properties
TouchList.length
Read only-
The number of
Touch
objects in theTouchList
.
Instance methods
TouchList.item()
-
Returns the
Touch
object at the specified index in the list.
Example
Specifications
Specification |
---|
Touch Events # touchlist-interface |
Browser compatibility
BCD tables only load in the browser