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.

Themouseover event is fired at anElement 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.

If the target element has child elements,mouseout andmouseover events fire as the mouse moves over the boundaries of these elements too, not just the target element itself. Usually,mouseenter andmouseleave events' behavior is more sensible, because they are not affected by moving into child elements.

Syntax

Use the event name in methods likeaddEventListener(), or set an event handler property.

addEventListener("mouseover", (event) => { })onmouseover = (event) => { }

Event type

AMouseEvent. Inherits fromUIEvent andEvent.

Event properties

This interface also inherits properties of its parents,UIEvent andEvent.

MouseEvent.altKeyRead only: Returnstrue if thealt key was down when the mouse event was fired.
MouseEvent.buttonRead only: The button number that was pressed (if applicable) when the mouse event was fired.
MouseEvent.buttonsRead only: The buttons being pressed (if any) when the mouse event was fired.
MouseEvent.clientXRead only: The X coordinate of the mouse pointer inviewport coordinates.
MouseEvent.clientYRead only: The Y coordinate of the mouse pointer inviewport coordinates.
MouseEvent.ctrlKeyRead only: Returnstrue if thecontrol key was down when the mouse event was fired.
MouseEvent.layerXNon-standardRead only: Returns the horizontal coordinate of the event relative to the current layer.
MouseEvent.layerYNon-standardRead only: Returns the vertical coordinate of the event relative to the current layer.
MouseEvent.metaKeyRead only: Returnstrue if themeta key was down when the mouse event was fired.
MouseEvent.movementXRead only: The X coordinate of the mouse pointer relative to the position of the lastmousemove event.
MouseEvent.movementYRead only: The Y coordinate of the mouse pointer relative to the position of the lastmousemove event.
MouseEvent.offsetXRead only: The X coordinate of the mouse pointer relative to the position of the padding edge of the target node.
MouseEvent.offsetYRead only: The Y coordinate of the mouse pointer relative to the position of the padding edge of the target node.
MouseEvent.pageXRead only: The X coordinate of the mouse pointer relative to the whole document.
MouseEvent.pageYRead only: The Y coordinate of the mouse pointer relative to the whole document.
MouseEvent.relatedTargetRead only: The secondary target for the event, if there is one.
MouseEvent.screenXRead only: The X coordinate of the mouse pointer inscreen coordinates.
MouseEvent.screenYRead only: The Y coordinate of the mouse pointer inscreen coordinates.
MouseEvent.shiftKeyRead only: Returnstrue if theshift key was down when the mouse event was fired.
MouseEvent.mozInputSourceNon-standardRead only: The type of device that generated the event (one of theMOZ_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.webkitForceNon-standardRead only: The amount of pressure applied when clicking.
MouseEvent.xRead only: Alias forMouseEvent.clientX.
MouseEvent.yRead only: Alias forMouseEvent.clientY.

Examples

The following example illustrates the difference betweenmouseover andmouseenter events.

HTML

html

<ul>  <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 listtest.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);});// This handler will be executed every time the cursor// is moved over a different list itemtest.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);});