MouseEvent

The MouseEvent.altKey read-only property is a boolean value that indicates whether the alt key was pressed or not when a given mouse event occurs.

The MouseEvent.button read-only property indicates which button was pressed or released on the mouse to trigger the event.

The MouseEvent.buttons read-only property indicates which buttons are pressed on the mouse (or other input device) when a mouse event is triggered.

The clientX read-only property of the MouseEvent interface provides the horizontal coordinate within the application's viewport at which the event occurred (as opposed to the coordinate within the page).

The clientY read-only property of the MouseEvent interface provides the vertical coordinate within the application's viewport at which the event occurred (as opposed to the coordinate within the page).

The MouseEvent.ctrlKey read-only property is a boolean value that indicates whether the ctrl key was pressed or not when a given mouse event occurs.

The UIEvent.detail read-only property, when non-zero, provides the current (or next, depending on the event) click count.

The MouseEvent.layerX read-only property returns the horizontal coordinate of the event relative to the current layer.

The MouseEvent.layerY read-only property returns the vertical coordinate of the event relative to the current layer.

The MouseEvent.metaKey read-only property is a boolean value that indicates whether the meta key was pressed or not when a given mouse event occurs.

The movementX read-only property of the MouseEvent interface provides the difference in the X coordinate of the mouse pointer between the given event and the previous mousemove event. In other words, the value of the property is computed like this: currentEvent.movementX = currentEvent.screenX - previousEvent.screenX.

The movementY read-only property of the MouseEvent interface provides the difference in the Y coordinate of the mouse pointer between the given event and the previous mousemove event. In other words, the value of the property is computed like this: currentEvent.movementY = currentEvent.screenY - previousEvent.screenY.

The offsetX read-only property of the MouseEvent interface provides the offset in the X coordinate of the mouse pointer between that event and the padding edge of the target node.

The offsetY read-only property of the MouseEvent interface provides the offset in the Y coordinate of the mouse pointer between that event and the padding edge of the target node.

The pageX read-only property of the MouseEvent interface returns the X (horizontal) coordinate (in pixels) at which the mouse was clicked, relative to the left edge of the entire document. This includes any portion of the document not currently visible.

The pageY read-only property of the MouseEvent interface returns the Y (vertical) coordinate (in pixels) at which the mouse was clicked, relative to the top edge of the entire document. This includes any portion of the document not currently visible.

The MouseEvent.relatedTarget read-only property is the secondary target for the mouse event, if there is one.

The screenX read-only property of the MouseEvent interface provides the horizontal coordinate (offset) of the mouse pointer in screen coordinates.

The screenY read-only property of the MouseEvent interface provides the vertical coordinate (offset) of the mouse pointer in screen coordinates.

The MouseEvent.shiftKey read-only property is a boolean value that indicates whether the shift key was pressed or not when a given mouse event occurs.

The UIEvent.view read-only property returns the WindowProxy object from which the event was generated. In browsers, this is the Window object the event happened in.

The MouseEvent.x property is an alias for the MouseEvent.clientX property.

The MouseEvent.y property is an alias for the MouseEvent.clientY property.

The MouseEvent.getModifierState() method returns the current state of the specified modifier key: true if the modifier is active (i.e., the modifier key is pressed or locked), otherwise, false.