This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The FocusEvent() constructor returns a newly created FocusEvent object with an optional EventTarget. When a change a focus has a source and a destination, the relatedTarget value must be set to the other target.
var focusEvent = new FocusEvent(typeArg, focusEventInit);
The FocusEvent() constructor also inherits arguments from UIEvent() and from Event().
typeArgDOMString representing the name of the event.focusEventInitOptional
FocusEventInit dictionary, having the following fields: "relatedTarget", optional and defaulting to null, is an EventTarget representing the secondary target of a FocusEvent.The FocusEventInit dictionary also accepts fields from the UIEventInit and EventInit dictionaries.
| Specification | Status | Comment |
|---|---|---|
| Document Object Model (DOM) Level 3 Events Specification The definition of 'FocusEvent()' in that specification. | Obsolete | Initial definition |
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | (Yes) | 24.0 (24.0) | No support | (Yes) | (Yes) |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | (Yes) | 24.0 (24.0) | No support | (Yes) | (Yes) |
FocusEvent interface it belongs to.
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https://developer.mozilla.org/en-US/docs/Web/API/FocusEvent/FocusEvent