files/en-us/web/api/intersectionobserverentry/isintersecting/index.md
{{APIRef("Intersection Observer API")}}
The isIntersecting read-only property of the {{domxref("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 {{domxref("IntersectionObserverEntry.target", "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 {{domxref("IntersectionObserver.root", "intersection root", "", 1)}}.
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.
{{Specifications}}
{{Compat}}