onFocusEvents([callback], [remove])

Class: RadioButton. Method inherited from UIComponent.

Description:

Gets, registers or unregisters a focus event handler function.

Parameters:

Name	Type	Default	Description
`[callback]`	function		The event handler function that receives a FocusEvent object. Pass `null` to unregister all handler functions.
`[remove]`	boolean	false	Set to `true` to unregister the event handler.

Returns:

An array of handler functions if no arguments are passed, otherwise this component for method chaining.

Type: this | Array.<function()>

Examples:

// Example event object:
const e = {
  target: object,     // The component that triggered the event.
  type: string,       // `focus`, `blur`.
  cause: string       // `UNKNOWN`, `ACTIVATION`, `TRAVERSAL_FORWARD`, `TRAVERSAL_BACKWARD`.
  temporary: boolean, // Identifies the focus change event as temporary or permanent
};

Also See:

FocusEvent