files/en-us/web/api/mouseevent/layery/index.md
{{APIRef("Pointer Events")}}{{Non-standard_Header}}
The MouseEvent.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.
An integer value in pixels for the y-coordinate of the mouse pointer, when the mouse event fired.
<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" />
pageX: <input type="text" name="pageXCoords" size="7" /> pageY:
<input type="text" name="pageYCoords" size="7" />
layerX: <input type="text" name="layerXCoords" size="7" /> layerY:
<input type="text" name="layerYCoords" size="7" />
</form>
</div>
#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;
}
function showCoords(evt) {
const form = document.forms.form_coords;
const parentId = evt.target.parentNode.id;
form.parentId.value = parentId;
form.pageXCoords.value = evt.pageX;
form.pageYCoords.value = evt.pageY;
form.layerXCoords.value = evt.layerX;
form.layerYCoords.value = evt.layerY;
}
window.addEventListener("mousedown", showCoords);
This property is not part of any specification.
{{Compat}}