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

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support22 Yes

521

18 — 242

No No No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes6 Yes Yes ?

1. Touch events support has been fixed and reenabled in Windows desktop platforms.

2. Web compatibility issues seen in bug 888304.

Document Tags and Contributors

Last updated by: fscholz,