Touch: screenX property
Summary
Returns the X coordinate of the touch point relative to the screen, not including any scroll offset.
Value
A number.
Examples
This example illustrates how to access the Touch
object's Touch.screenX
and Touch.screenY
properties. The Touch.screenX
property is the horizontal (x) coordinate of a touch point relative to the screen in CSS pixels. The Touch.screenY
property is the vertical coordinate of a touch point relative to the screen in CSS pixels.
In following simple code snippet, we assume the user initiates multiple touch contacts on an element with an id of source
and then releases contacts with the surface. When the touchstart
event handler is invoked, each touch point's Touch.screenX
and Touch.screenY
coordinates are accessed.
js
// Register a touchstart listeners for the 'source' element
const src = document.getElementById("source");
src.addEventListener(
"touchstart",
(e) => {
// Iterate through the touch points and log each screenX/Y coordinate.
// The unit of each coordinate is CSS pixels.
for (let i = 0; i < e.touches.length; i++) {
console.log(`touchpoint[${i}].screenX = ${e.touches[i].screenX}`);
console.log(`touchpoint[${i}].screenY = ${e.touches[i].screenY}`);
}
},
false
);
Specifications
Specification |
---|
Touch Events # dom-touch-screenx |
Browser compatibility
BCD tables only load in the browser