onViewportEnter( )
Adds an event handler that runs when an element is displayed in the viewable part of the current window.
An element enters the viewport when the page is scrolled to show any
part of the element. An element also enters the viewport if it was
hidden or collapsed
and is then shown or expanded in the viewable part of the current window. onViewportEnter()
is not fired for hidden or collapsed
elements even if they are scrolled into view.
You can also define an event handler using the Properties and Events panel.
Method Declaration
Copy
Method Parameters
handlerfunctionRequired
handler(): void The name of the function or the function expression to run when the element enters the viewport.
Returns
Return Type:Element
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