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The MouseEvent.screenX read-only property provides the horizontal coordinate of the mouse pointer in global (screen) coordinates.
Syntax
var pixelNumber = instanceOfMouseEvent.screenX
Return value
pixelNumberis the offset from the left side of the screen in pixels.
Example
<html>
<head>
<title>screenX\screenY example</title>
<script type="text/javascript">
function showCoords(evt){
alert(
"screenX value: " + evt.screenX + "\n"
+ "screenY value: " + evt.screenY + "\n"
);
}
</script>
</head>
<body onmousedown="showCoords(event)">
<p>To display the mouse coordinates click anywhere on the page.</p>
</body>
</html>
When you trap events on the window, document, or other roomy elements, you can get the coordinates of that event (e.g., a click) and route it properly, as the following example demonstrates:
function checkClickMap(e) {
if (e.screenX < 50) doRedButton();
if (50 <= e.screenX && e.screenX < 100) doYellowButton();
if (e.screenX >= 100) doRedButton();
}
Specifications
| Specification | Status | Comment |
|---|---|---|
| Document Object Model (DOM) Level 3 Events Specification The definition of 'MouseEvent.screenX' in that specification. |
Working Draft | No change from Document Object Model (DOM) Level 2 Events Specification. |
| Document Object Model (DOM) Level 2 Events Specification The definition of 'MouseEvent.sceenX' in that specification. |
Recommendation | Initial definition |
Browser compatibility
| Feature | Firefox (Gecko) | Chrome | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | 6 | (Yes) | (Yes) |
| Feature | Firefox Mobile (Gecko) | Android | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |