Overview
View Enter triggers fire when a user scrolls an object into a selected view, while View Exit triggers fire when a user scrolls an object out of a selected view. Both triggers can be customized based on how much of the object is in or out of the view.
View Enter & Exit triggers should be added to the object that will come into view, not the scroll container.
Action Properties
View
Select the view that the object will be scrolled into or out of. Usually, this is a parent of the object the trigger is placed on.
Threshold
Set the threshold for how much of the object is in view before the trigger fires.
For View Enter triggers, a threshold of 0 will cause the trigger to fire as soon as the object's edge enters the view, while a threshold of 1 will cause the trigger to fire when the entire object is within the view.
For View Exit triggers, a threshold of 0 will cause the trigger to fire as soon as the object's edge exits the view, while a threshold of 1 will cause the trigger to fire when the entire object is outside the view.
Trigger
Choose if the trigger should trigger once, each time the user enter or exits the view, or continuously:
Once: Fires only the first time the user enters and exits the view.
Each Enter: Fires each time the user enters or exits the view.
Continuous: Fires continuously when the user is within the view (View Enter only).