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.
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 |
Browser compatibility
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