Baseline Widely available
The mouseup event is fired at an Element when a button on a pointing device (such as a mouse or trackpad) is released while the pointer is located inside it.
mouseup events are the counterpoint to mousedown events.
This behavior is different from pointerup events. When using a physical mouse, mouseup events fire whenever any button on a mouse is released. pointerup events fire only upon the last button release; previous button releases, while other buttons are held down, don't fire pointerup events.
Use the event name in methods like addEventListener(), or set an event handler property.
addEventListener("mouseup", (event) => { })
onmouseup = (event) => { }
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.
MouseEvent.button Read only
The button number that was pressed (if applicable) when the mouse event was fired.
MouseEvent.buttons Read only
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.
See mousemove event for example code.
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