CODEWITHSUNDEEP
javascriptintersection-observer
wiktus239
wiktus239

Reputation: 1420

How to dynamically change Intersection Observer's configuration

I have a section on my page to which when user scrolls, an event fires. The solution uses IntersectionObserver which is perfect for my need. However, I would like to adapt the size of rootMargin of this observer, when the uses is already there.

Now the simplest approach when having an observer like this:

const options = { rootMargin: '20px' };
let observer = new IntersectionObserver(callback, options);

would be to assign the properties of it:

observer.rootMargin = '0px';

But is doesn't seem to work.

Is is possible and how to change the behaviour of once created Intersection Observer?

Upvotes: 6

Views: 4627

Answers (1)

brunnerh
brunnerh

Reputation: 185180

You cannot, the properties are readonly.

interface IntersectionObserver {
  readonly attribute Element? root;
  readonly attribute DOMString rootMargin;
  readonly attribute FrozenArray<double> thresholds;
  ...

You should just replace your old observer with a new one. Maybe copy over the old options and just set what you need.

Upvotes: 10

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