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 ModuleThe definition of 'clientY' in that specification. | Working Draft | Redefines MouseEvent from long to double .
|
Document Object Model (DOM) Level 3 Events SpecificationThe 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 SpecificationThe definition of 'MouseEvent.clientY' in that specification. | Obsolete | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
clientY
|
Chrome
Full support Yes |
Edge
Full support 12 |
Firefox
Full support Yes |
IE
Full support 9 |
Opera
Full support Yes |
Safari
Full support Yes |
WebView Android
Full support Yes |
Chrome Android
Full support Yes |
Firefox Android
Full support Yes |
Opera Android
Full support Yes |
Safari iOS
Full support Yes |
Samsung Internet Android
Full support Yes |
Value type changed from long to double
|
Chrome
Full support 56 |
Edge
Full support ≤79 |
Firefox
? |
IE
? |
Opera
? |
Safari
? |
WebView Android
Full support 56 |
Chrome Android
Full support 56 |
Firefox Android
? |
Opera Android
? |
Safari iOS
? |
Samsung Internet Android
Full support 6.0 |
Legend
- Full support
- Full support
- Compatibility unknown
- Compatibility unknown
See also
MouseEvent.clientY by Mozilla Contributors is licensed under CC-BY-SA 2.5.