Interface FocusEvent

The FocusEvent interface represents focus-related events, including Element/focus_event, Element/blur_event, Element/focusin_event, and Element/focusout_event.

MDN Reference

interface FocusEvent {
    AT_TARGET: 2;
    bubbles: boolean;
    BUBBLING_PHASE: 3;
    cancelable: boolean;
    cancelBubble: boolean;
    CAPTURING_PHASE: 1;
    composed: boolean;
    currentTarget: EventTarget | null;
    defaultPrevented: boolean;
    detail: number;
    eventPhase: number;
    isTrusted: boolean;
    NONE: 0;
    relatedTarget: EventTarget | null;
    returnValue: boolean;
    srcElement: EventTarget | null;
    target: EventTarget | null;
    timeStamp: number;
    type: string;
    view: Window | null;
    which: number;
    composedPath(): EventTarget[];
    initEvent(type: string, bubbles?: boolean, cancelable?: boolean): void;
    initUIEvent(
        typeArg: string,
        bubblesArg?: boolean,
        cancelableArg?: boolean,
        viewArg?: Window | null,
        detailArg?: number,
    ): void;
    preventDefault(): void;
    stopImmediatePropagation(): void;
    stopPropagation(): void;
}
Hierarchy
Index

Properties

AT_TARGET bubbles BUBBLING_PHASE cancelable cancelBubble CAPTURING_PHASE composed currentTarget defaultPrevented detail eventPhase isTrusted NONE relatedTarget returnValue srcElement target timeStamp type view which

Methods

composedPath initEvent initUIEvent preventDefault stopImmediatePropagation stopPropagation

Properties

AT_TARGET: 2
bubbles: boolean

The bubbles read-only property of the Event interface indicates whether the event bubbles up through the DOM tree or not.

MDN Reference

BUBBLING_PHASE: 3
cancelable: boolean

The cancelable read-only property of the Event interface indicates whether the event can be canceled, and therefore prevented as if the event never happened.

MDN Reference

cancelBubble: boolean

The cancelBubble property of the Event interface is deprecated.

MDN Reference

CAPTURING_PHASE: 1
composed: boolean

The read-only composed property of the or not the event will propagate across the shadow DOM boundary into the standard DOM.

MDN Reference

currentTarget: EventTarget | null

The currentTarget read-only property of the Event interface identifies the element to which the event handler has been attached.

MDN Reference

defaultPrevented: boolean

The defaultPrevented read-only property of the Event interface returns a boolean value indicating whether or not the call to Event.preventDefault() canceled the event.

MDN Reference

detail: number

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

MDN Reference

eventPhase: number

The eventPhase read-only property of the being evaluated.

MDN Reference

isTrusted: boolean

The isTrusted read-only property of the when the event was generated by the user agent (including via user actions and programmatic methods such as HTMLElement.focus()), and false when the event was dispatched via The only exception is the click event, which initializes the isTrusted property to false in user agents.

MDN Reference

NONE: 0
relatedTarget: EventTarget | null

The relatedTarget read-only property of the FocusEvent interface is the secondary target, depending on the type of event:

Event name target relatedTarget
Element/blur_event The EventTarget losing focus The EventTarget receiving focus (if any).
Element/focus_event The EventTarget receiving focus The EventTarget losing focus (if any)
Element/focusin_event The EventTarget receiving focus The EventTarget losing focus (if any)
Element/focusout_event The EventTarget losing focus The EventTarget receiving focus (if any)
Note that many elements can't have focus, which is a common reason for relatedTarget to be null.

MDN Reference

returnValue: boolean

The Event property returnValue indicates whether the default action for this event has been prevented or not.

MDN Reference

srcElement: EventTarget | null

The deprecated Event.srcElement is an alias for the Event.target property.

MDN Reference

target: EventTarget | null

The read-only target property of the dispatched.

MDN Reference

timeStamp: number

The timeStamp read-only property of the Event interface returns the time (in milliseconds) at which the event was created.

MDN Reference

type: string

The type read-only property of the Event interface returns a string containing the event's type.

MDN Reference

view: Window | null

The UIEvent.view read-only property returns the is the Window object the event happened in.

MDN Reference

which: number

The UIEvent.which read-only property of the UIEvent interface returns a number that indicates which button was pressed on the mouse, or the numeric keyCode or the character code (charCode) of the key pressed on the keyboard.

MDN Reference

Methods

  • The composedPath() method of the Event interface returns the event's path which is an array of the objects on which listeners will be invoked.

    MDN Reference

    Returns EventTarget[]

  • The Event.initEvent() method is used to initialize the value of an event created using Document.createEvent().

    Parameters

    • type: string
    • Optionalbubbles: boolean
    • Optionalcancelable: boolean

    Returns void

    MDN Reference

  • The UIEvent.initUIEvent() method initializes a UI event once it's been created.

    Parameters

    • typeArg: string
    • OptionalbubblesArg: boolean
    • OptionalcancelableArg: boolean
    • OptionalviewArg: Window | null
    • OptionaldetailArg: number

    Returns void

    MDN Reference

  • The preventDefault() method of the Event interface tells the user agent that if the event does not get explicitly handled, its default action should not be taken as it normally would be.

    MDN Reference

    Returns void

  • The stopImmediatePropagation() method of the If several listeners are attached to the same element for the same event type, they are called in the order in which they were added.

    MDN Reference

    Returns void

  • The stopPropagation() method of the Event interface prevents further propagation of the current event in the capturing and bubbling phases.

    MDN Reference

    Returns void

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