Element: mouseover event
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The mouseover
event is fired at an Element
when a pointing device (such as a mouse or trackpad) is used to move the cursor onto the element or one of its child elements.
Syntax
Use the event name in methods like addEventListener()
, or set an event handler property.
addEventListener("mouseover", (event) => {});
onmouseover = (event) => {};
Event type
A MouseEvent
. Inherits from UIEvent
and Event
.
Event properties
This interface also inherits properties of its parents, UIEvent
and Event
.
MouseEvent.altKey
Read only-
Returns
true
if the alt key was down when the mouse event was fired. -
The button number that was pressed (if applicable) when the mouse event was fired.
-
The buttons being pressed (if any) when the mouse event was fired.
MouseEvent.clientX
Read only-
The X coordinate of the mouse pointer in viewport coordinates.
MouseEvent.clientY
Read only-
The Y coordinate of the mouse pointer in viewport coordinates.
MouseEvent.ctrlKey
Read only-
Returns
true
if the control key was down when the mouse event was fired. MouseEvent.layerX
Non-standard Read only-
Returns the horizontal coordinate of the event relative to the current layer.
MouseEvent.layerY
Non-standard Read only-
Returns the vertical coordinate of the event relative to the current layer.
MouseEvent.metaKey
Read only-
Returns
true
if the meta key was down when the mouse event was fired. MouseEvent.movementX
Read only-
The X coordinate of the mouse pointer relative to the position of the last
mousemove
event. MouseEvent.movementY
Read only-
The Y coordinate of the mouse pointer relative to the position of the last
mousemove
event. MouseEvent.offsetX
Read only-
The X coordinate of the mouse pointer relative to the position of the padding edge of the target node.
MouseEvent.offsetY
Read only-
The Y coordinate of the mouse pointer relative to the position of the padding edge of the target node.
MouseEvent.pageX
Read only-
The X coordinate of the mouse pointer relative to the whole document.
MouseEvent.pageY
Read only-
The Y coordinate of the mouse pointer relative to the whole document.
-
The secondary target for the event, if there is one.
MouseEvent.screenX
Read only-
The X coordinate of the mouse pointer in screen coordinates.
MouseEvent.screenY
Read only-
The Y coordinate of the mouse pointer in screen coordinates.
MouseEvent.shiftKey
Read only-
Returns
true
if the shift key was down when the mouse event was fired. MouseEvent.mozInputSource
Non-standard Read only-
The type of device that generated the event (one of the
MOZ_SOURCE_*
constants). This lets you, for example, determine whether a mouse event was generated by an actual mouse or by a touch event (which might affect the degree of accuracy with which you interpret the coordinates associated with the event). MouseEvent.webkitForce
Non-standard Read only-
The amount of pressure applied when clicking.
MouseEvent.x
Read only-
Alias for
MouseEvent.clientX
. MouseEvent.y
Read only-
Alias for
MouseEvent.clientY
.
Examples
The following example illustrates the difference between mouseover
and mouseenter
events.
HTML
<ul id="test">
<li>item 1</li>
<li>item 2</li>
<li>item 3</li>
</ul>
JavaScript
const test = document.getElementById("test");
// This handler will be executed only once when the cursor
// moves over the unordered list
test.addEventListener(
"mouseenter",
(event) => {
// highlight the mouseenter target
event.target.style.color = "purple";
// reset the color after a short delay
setTimeout(() => {
event.target.style.color = "";
}, 500);
},
false,
);
// This handler will be executed every time the cursor
// is moved over a different list item
test.addEventListener(
"mouseover",
(event) => {
// highlight the mouseover target
event.target.style.color = "orange";
// reset the color after a short delay
setTimeout(() => {
event.target.style.color = "";
}, 500);
},
false,
);
Result
Specifications
Specification |
---|
UI Events # event-type-mouseover |
HTML Standard # handler-onmouseover |
Browser compatibility
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