onFocus( )

Adds an event handler that runs when the element receives focus.

An element receives focus through user actions, such as clicking and tabbing, or programmatically, using the focus( ) function.

Note: onFocus() has no effect when applied to RadioButtonGroup elements.

Method Declaration
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Method Parameters
handlerfunctionRequired

handler(event: Event): void The name of the function or the function expression to run when the element receives focus.

Returns
Return Type:Element
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