onViewportEnter( )

Adds an event handler that runs when an element is displayed in the viewable part of the current window.

Description

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.

Syntax

function onViewportEnter(handler: EventHandler): Element
handler: function EventHandler(event: Event): void

onViewportEnter Parameters

NAME

TYPE

DESCRIPTION

handler

EventHandler

The name of the function or the function expression to run when the element enters the viewport.

Returns

The element on which the event is now registered.

Return Type:

Element

EventHandler Parameters

NAME

TYPE

DESCRIPTION

event

Event

The event that occurred.

Returns

This function does not return anything.

Return Type:

void

Mixed in from:$w.Element

Get the ID of the element that has entered the viewport

Copy Code

1$w("#myElement").onViewportEnter( (event) => {
2  let targetId = event.target.id; // "myElement"
3});