MouseEvent.clientY
The clientY
read-only property of the
MouseEvent
interface provides the vertical coordinate within the
application's viewport at which the event occurred (as opposed to the
coordinate within the page).
For example, clicking on the top edge of the viewport will always result in a mouse
event with a clientY
value of 0
, regardless of whether the
page is scrolled vertically.
Syntax
var y = instanceOfMouseEvent.clientY
Return value
A double
floating point value, as redefined by the CSSOM View Module.
Originally, this property was defined as a long
integer. See the "Browser
compatibility" section for details.
Example
This example displays your mouse's coordinates whenever you trigger the
mousemove
event.
HTML
<p>Move your mouse to see its position.</p>
<p id="screen-log"></p>
JavaScript
let screenLog = document.querySelector('#screen-log');
document.addEventListener('mousemove', logKey);
function logKey(e) {
screenLog.innerText = `
Screen X/Y: ${e.screenX}, ${e.screenY}
Client X/Y: ${e.clientX}, ${e.clientY}`;
}
Result
Specifications
Specification | Status | Comment |
---|---|---|
CSS Object Model (CSSOM) View Module The definition of 'clientY' in that specification. |
Working Draft | Redefines MouseEvent from long to
double . |
Document Object Model (DOM) Level 3 Events Specification The definition of 'MouseEvent.clientY' in that specification. |
Obsolete | No change from Document Object Model (DOM) Level 2 Events Specification. |
Document Object Model (DOM) Level 2 Events Specification The definition of 'MouseEvent.clientY' in that specification. |
Obsolete | Initial definition. |
Browser compatibility
BCD tables only load in the browser