Web/API/Touch/clientY

The Touch.clientY read-only property returns the Y coordinate of the touch point relative to the browser's viewport, not including any scroll offset.

Syntax

touchItem.clientY;

Return value

A long value representing the Y coordinate of the touch point relative to the viewport, not including any scroll offset.

Example

This example illustrates using the Touch object's Touch.clientX and Touch.clientY properties. The Touch.clientX property is the horizontal coordinate of a touch point relative to the browser's viewport excluding any scroll offset. The Touch.clientY property is the vertical coordinate of the touch point relative to the browser's viewport excluding any scroll offset .

In this example, we assume the user initiates a touch on an element with an id of source, moves within the element or out of the element and then releases contact with the surface. When the touchend event handler is invoked, the changes in the Touch.clientX and Touch.clientY coordinates, from the starting touch point to the ending touch point, are calculated.

// Register touchstart and touchend listeners for element 'source'
var src = document.getElementById("source");
var clientX, clientY;

src.addEventListener('touchstart', function(e) {
  // Cache the client X/Y coordinates
  clientX = e.touches[0].clientX;
  clientY = e.touches[0].clientY;
}, false);

src.addEventListener('touchend', function(e) {
  var deltaX, deltaY;

  // Compute the change in X and Y coordinates. 
  // The first touch point in the changedTouches
  // list is the touch point that was just removed from the surface.
  deltaX = e.changedTouches[0].clientX - clientX;
  deltaY = e.changedTouches[0].clientY - clientY;

  // Process the data ... 
}, false);

Specifications

Specification	Status	Comment
Touch Events – Level 2	Draft	No changes since last version.
Touch Events	Recommendation	Initial definition.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`clientY`	Chrome Full support 22	Edge Full support ≤18	Firefox Full support 52 Notes' Full support 52 Notes' Notes' Touch events support has been fixed and reenabled in Windows desktop platforms. No support 18 — 24 Notes' Notes' Web compatibility issues seen in bug 888304.	IE No support No	Opera Full support Yes	Safari No support No	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support 6	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support Yes

Legend

Full support: Full support
No support: No support
See implementation notes.': See implementation notes.

Touch.clientY by Mozilla Contributors is licensed under CC-BY-SA 2.5.