This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The IntersectionObserver
method observe()
adds an element to the set of target elements being watched by the IntersectionObserver
. One observer has one set of thresholds and one root, but can watch multiple target elements for visibility changes in keeping with those. To stop observing the element, call IntersectionObserver.unobserve()
.
When the visibility of the specified element crosses over one of the observer's visibility thresholds (as listed in IntersectionObserver.thresholds
), the observer's callback is executed with an array of IntersectionObserverEntry
objects representing the intersection changes which occurred. Note that this design allows multiple elements' intersection changes to be processed by a single call to the callback.
Syntax
IntersectionObserver.observe(targetElement);
Parameters
targetElement
- An
element
whose visibility within the root is to be monitored. This element must be a descendant of the root element (or contained wtihin the current document, if the root is the document's viewport).
Return value
undefined
.
Examples
<<<...>>>
Specifications
Specification | Status | Comment |
---|---|---|
Intersection Observer The definition of 'IntersectionObserver.observe()' 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.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
observe | Chrome Full support 51 | Edge Full support 15 | Firefox
Full support
55
| IE No support No | Opera Full support Yes | Safari Full support 12.1 | WebView Android Full support 51 | Chrome Android Full support 51 | Firefox Android ? | Opera Android ? | Safari iOS Full support 12.2 | Samsung Internet Android Full support 5.0 |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.
- User must explicitly enable this feature.
- User must explicitly enable this feature.