IntersectionObserverEntry: isIntersecting property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2019.
Please take two minutes to fill out our short survey.
The IntersectionObserverEntry interface's
read-only isIntersecting property 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.
Value
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).
Examples
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.
Specifications
| Specification |
|---|
| Intersection Observer # dom-intersectionobserverentry-isintersecting |