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.
You can also define an event handler using the Properties and Events panel.
Note: onFocus() has no effect when applied to RadioButtonGroup elements.
Method Declaration
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Method Parameters
handlerfunctionRequired
handler(): 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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