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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 Editor's Draft No changes since last version.
Touch Events Recommendation Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 22.0 18.0 (18.0) Not supported Not supported Not supported
Feature Android Android Webview Chrome for Android Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) 6.0 (6.0) (Yes) 11 (Yes) (Yes)

Document Tags and Contributors

 Contributors to this page: AFBarstow, teoli, fscholz, jsx, kscarfone, Khodaidad_Basharmand, Sheppy
 Last updated by: AFBarstow,