This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
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.
Syntax
var isIntersecting =
IntersectionObserverEntry.isIntersecting;
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
).
Example
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(function(entry) { if (entry.isIntersecting) { intersectingCount += 1; } else { intersectingCount -= 1; } }); }
To see a more concrete example, take a look at Handling intersection changes in Timing element visibility with the Intersection Observer API.
Specifications
Specification | Status | Comment |
---|---|---|
Intersection Observer The definition of 'IntersectionObserverEntry.isIntersecting' in that specification. |
Working Draft | Initial definition |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 51 | No | 53 — 551 55 | No | ? | ? |
Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic support | 51 | 51 | No | ? | No | ? | ? |
1. From version 53 until version 55 (exclusive): this feature is behind the dom.IntersectionObserver.enabled
preference (needs to be set to true
). To change preferences in Firefox, visit about:config.