onViewportLeave( )

Adds an event handler that runs when an element is no longer displayed in the viewable part of the current window.

Description

An element leaves the viewport when the page is scrolled so that the element is completely out of view. An element also leaves the viewport if it was shown or expanded and is then hidden or collapsed from the viewable part of the current window. onViewportLeave() is not fired for hidden or collapsed elements even if they are scrolled out of view.

You can also define an event handler using the Properties and Events panel.

Syntax

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

onViewportLeave Parameters

NAME

TYPE

DESCRIPTION

handler

EventHandler

The name of the function or the function expression to run when the element leaves 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.FormElement

Get the ID of the element that has left the viewport

Copy Code

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