Baseline Widely available
The isIntersecting read-only property of the IntersectionObserverEntry interface is a Boolean value which is true if the target element intersects with the intersection observer's root.
If this is true, then, the IntersectionObserverEntry describes a transition into a state of intersection; if it's false, then you know the transition is from intersecting to not-intersecting.
A Boolean value which indicates whether the target element has transitioned into a state of intersection (true) or out of a state of intersection (false).
In this simple example, an intersection callback is used to update a counter of how many targeted elements are currently intersecting with the intersection root.
function intersectionCallback(entries) {
entries.forEach((entry) => {
if (entry.isIntersecting) {
intersectingCount += 1;
} else {
intersectingCount -= 1;
}
});
}
To see a more concrete example, take a look at Handling intersection changes.
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