A TouchEvent interface represents an event sent when the state of contacts with a touch-sensitive surface changes. This surface can be a touch screen or trackpad, for example. The event can describe one or more points of contact with the screen and includes support for detecting movement, addition and removal of contact points, and so forth.
Touches are represented by the Touch object; each touch is described by a position, size and shape, amount of pressure, and target element. Lists of touches are represented by TouchList objects.
Properties
This interface inherits properties from its parent, UIEvent and Event.
TouchEvent.altKey Read only
A Boolean value indicating whether or not the alt key was down when the touch event was fired.
TouchEvent.changedTouches Read only
A TouchList of all the Touch objects representing individual points of contact whose states changed between the previous touch event and this one.
TouchEvent.ctrlKey Read only
A Boolean value indicating whether or not the control key was down when the touch event was fired.
TouchEvent.metaKey Read only
A Boolean value indicating whether or not the meta key was down when the touch event was fired.
TouchEvent.shiftKey Read only
A Boolean value indicating whether or not the shift key was down when the touch event was fired.
TouchEvent.targetTouchesRead only
A TouchList of all the Touch objects that are both currently in contact with the touch surface and were also started on the same element that is the target of the event.
TouchEvent.touches Read only
A TouchList of all the Touch objects representing all current points of contact with the surface, regardless of target or changed status.
Methods
This interface inherits methods from its parents UIEvent and Event.
TouchEvent.initTouchEvent()
Initializes a TouchEvent created via Document.createEvent("TouchEvent"). This method has no more effect once the event has been dispatched.
Touch event types
There are several types of event that can be fired to indicate that touch-related changes have occurred. You can determine which of these has happened by looking at the event's TouchEvent.type property.
Note: It's important to note that in many cases, both touch and mouse events get sent (in order to let non-touch-specific code still interact with the user). If you use touch events, you should call event.preventDefault() to keep the mouse event from being sent as well.