UIEvent.layerY

Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The UIEvent.layerY read-only property returns the vertical coordinate of the event relative to the current layer.

This property takes scrolling of the page into account, and returns a value relative to the whole of the document, unless the event occurs inside a positioned element, where the returned value is relative to the top left of the positioned element.

Syntax

var ypos = event.layerY;

ypos is an integer value in pixels for the y-coordinate of the mouse pointer, when the mouse event fired.

Example

<html>
<head>
<title>pageX\pageY & layerX\layerY example</title>

<script type="text/javascript">

function showCoords(evt){
  var form = document.forms.form_coords;
  var parent_id = evt.target.parentNode.id;
  form.parentId.value = parent_id;
  form.pageXCoords.value = evt.pageX;
  form.pageYCoords.value = evt.pageY;
  form.layerXCoords.value = evt.layerX;
  form.layerYCoords.value = evt.layerY;
}
</script>

<style type="text/css">

 #d1 {
  border: solid blue 1px;
  padding: 20px;
 }

 #d2 {
  position: absolute;
  top: 180px;
  left: 80%;
  right:auto;
  width: 40%;
  border: solid blue 1px;
  padding: 20px;
 }

 #d3 {
  position: absolute;
  top: 240px;
  left: 20%;
  width: 50%;
  border: solid blue 1px;
  padding: 10px;
 }

</style>
</head>

<body onmousedown="showCoords(event)">

<p>To display the mouse coordinates please click anywhere on the page.</p>

<div id="d1">
<span>This is an un-positioned div so clicking it will return
layerX/layerY values almost the same as pageX/PageY values.</span>
</div>

<div id="d2">

<span>This is a positioned div so clicking it will return layerX/layerY
values that are relative to the top-left corner of this positioned
element. Note the pageX\pageY properties still return the
absolute position in the document, including page scrolling.</span>

<span>Make the page scroll more! This is a positioned div so clicking it
will return layerX/layerY values that are relative to the top-left
corner of this positioned element. Note the pageX\pageY properties still
return the absolute position in the document, including page
scrolling.</span>

</div>

<div id="d3">
<form name="form_coords" id="form1">
 Parent Element id: <input type="text" name="parentId" size="7" /><br />
 pageX:<input type="text" name="pageXCoords" size="7" />
 pageY:<input type="text" name="pageYCoords" size="7" /><br />
 layerX:<input type="text" name="layerXCoords" size="7" />
 layerY:<input type="text" name="layerYCoords" size="7" />
</form>
</div>

</body>
</html>

Specifications

This property is not part of any specification.

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`layerY`	1-45	12	1	9	15-32	≤4	≤37-45	18-45	4	14-32	≤3	1.0-5.0

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https://developer.mozilla.org/en-US/docs/Web/API/UIEvent/layerY