HTML DOM MouseEvent

Last Updated : 11 Jul, 2025

The MouseEvent Object handles events that occur when the mouse interacts with the HTML document. There are lots of events that interacts with the HTML document.

Mouse Events: Mouse events are the action taken by the user on the web page, like clicking, hovering over, etc.

Mouse Events	Description
onmouseup	Occurs when a user releases a mouse button over an element.
onmousedown	Occurs when the button is pressed over an element.
onclick	Occurs when the user clicks on an element.
oncontextmenu	Occurs on right-clicking on an element
ondblclick	Occurs on a double-click on an element.
onmouseenter	Occurs when the pointer is moved onto an element.
onmouseleave	Occurs when the pointer is moved out of an element.
onmousemove	Occurs while the pointer moves over an element.
onmouseout	Occurs when a user moves the mouse pointer out of an element, or out of one of its children.
onmouseover	Occurs when the pointer moves over an element or its children.

MouseEvent Properties: These properties are used to inform the defined task if that happens.

Mouse Event Properties	Description
altKey	Define whether the alt key is pressed or not.
button	Define the left or right-click events.
clientX	Return the horizontal coordinate of the mouse pointer.
clientY	Return the vertical coordinate of the mouse pointer.
layerX	Return horizontal coordinate relative to the current layer.
layerY	Return vertical coordinates relative to the current layer.
metaKey	Indicates whether or not the “meta” key was pressed.
movementX	Give the difference between the X coordinate of the mouse between two events.
movementY	Give the difference between the Y coordinate of the mouse between two events.
mozInputSourc	Give information about the type of device that generates the event.
offsetX	Returning the x-coordinate of the mouse pointer.
offsetY	Returning the y-coordinate of the mouse pointer.
pageX	Returning the horizontal coordinate of the mouse pointer.
pageY	Returning the vertical coordinate of the mouse pointer.
relatedTarget	Returning the element that is related to the element that triggered the mouse event.
screenX	Returning the horizontal coordinate of the mouse pointer.
screenY	Returning the vertical coordinate of the mouse pointer.
shiftKey	Define whether the shift key is pressed or not.
webkitForce	Find pressure applied on the touchpad or touchscreen.
ctrlKey	Define whether the ctrl key is pressed or not.

Example: Below program illustrates onmousedown and onmouseup properties.

html

<h1 style="color:green">GeeksforGeeks</h1>
<p id="myP" onmousedown="mouseDown()" onmouseup="mouseUp()">
    The mouseDown() function works when the mouse button
    is pressed down over this paragraph and sets the color
    of the text to 'Yellow'. The mouseUp() function works 
    when the mouse button is released and sets the color
    of the text to 'Red'.
</p>

<script>
    function mouseDown() {
    
        // Using onmousedown property
        document.getElementById("myP").style.color = "yellow";
    }
    
    function mouseUp() {
    
        // Using onmouseup property
        document.getElementById("myP").style.color = "red";
    }
</script>