Touch
The Touch
interface represents a single contact point on a touch-sensitive device. The contact point is commonly a finger or stylus and the device may be a touchscreen or trackpad.
The Touch.radiusX
, Touch.radiusY
, and Touch.rotationAngle
describe the area of contact between the user and the screen, the touch area. This can be helpful when dealing with imprecise pointing devices such as fingers. These values are set to describe an ellipse that as closely as possible matches the entire area of contact (such as the user's fingertip).
Note: Many of the properties' values are hardware-dependent; for example, if the device doesn't have a way to detect the amount of pressure placed on the surface, the force
value will always be 0. This may also be the case for radiusX
and radiusY
; if the hardware reports only a single point, these values will be 1.
Constructor
Touch()
-
Creates a Touch object.
Instance properties
This interface has no parent, and doesn't inherit or implement other properties.
Basic properties
Touch.identifier
Read only-
Returns a unique identifier for this
Touch
object. A given touch point (say, by a finger) will have the same identifier for the duration of its movement around the surface. This lets you ensure that you're tracking the same touch all the time. Touch.screenX
Read only-
Returns the X coordinate of the touch point relative to the left edge of the screen.
Touch.screenY
Read only-
Returns the Y coordinate of the touch point relative to the top edge of the screen.
Touch.clientX
Read only-
Returns the X coordinate of the touch point relative to the left edge of the browser viewport, not including any scroll offset.
Touch.clientY
Read only-
Returns the Y coordinate of the touch point relative to the top edge of the browser viewport, not including any scroll offset.
Touch.pageX
Read only-
Returns the X coordinate of the touch point relative to the left edge of the document. Unlike
clientX
, this value includes the horizontal scroll offset, if any. Touch.pageY
Read only-
Returns the Y coordinate of the touch point relative to the top of the document. Unlike
clientY
, this value includes the vertical scroll offset, if any. Touch.target
Read only-
Returns the
Element
on which the touch point started when it was first placed on the surface, even if the touch point has since moved outside the interactive area of that element or even been removed from the document.
Touch area
Touch.radiusX
Read only-
Returns the X radius of the ellipse that most closely circumscribes the area of contact with the screen. The value is in pixels of the same scale as
screenX
. Touch.radiusY
Read only-
Returns the Y radius of the ellipse that most closely circumscribes the area of contact with the screen. The value is in pixels of the same scale as
screenY
. Touch.rotationAngle
Read only-
Returns the angle (in degrees) that the ellipse described by radiusX and radiusY must be rotated, clockwise, to most accurately cover the area of contact between the user and the surface.
Touch.force
Read only-
Returns the amount of pressure being applied to the surface by the user, as a
float
between0.0
(no pressure) and1.0
(maximum pressure).
Instance methods
This interface has no methods and no parent, and doesn't inherit or implement any methods.
Specifications
Specification |
---|
Touch Events # touch-interface |
Browser compatibility
BCD tables only load in the browser