Intersection Observer when element leaves the viewport
Is there a way to detect if an element leaves the viewport using Intersection Observers? For example, I have an element on the screen that I want to fire a callback when the top of the element hits the top of the viewport. From MDN:
The Intersection Observer API lets code register a callback function that is executed whenever an element they wish to monitor enters or exits another element (or the viewport), or when the amount by which the two intersect changes by a requested amount. -- (https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API)
So if I do something like below, I would have thought that the callback would have fired when the top of the element hit the top of the viewport as well?
var options = {
root: document.querySelector('#element'),
rootMargin: '0px',
threshold: 0
}
var observer = new IntersectionObserver(callback, options);
But it only seems to be firing when the top of the element scrolls in and hits the bottom of the viewport, but not both. Ideas?
javascript intersection-observer
asked Nov 14 '18 at 18:12
Barry HorbalBarry Horbal
111
add a comment |
Is there a way to detect if an element leaves the viewport using Intersection Observers? For example, I have an element on the screen that I want to fire a callback when the top of the element hits the top of the viewport. From MDN:
The Intersection Observer API lets code register a callback function that is executed whenever an element they wish to monitor enters or exits another element (or the viewport), or when the amount by which the two intersect changes by a requested amount. -- (https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API)
So if I do something like below, I would have thought that the callback would have fired when the top of the element hit the top of the viewport as well?
var options = {
root: document.querySelector('#element'),
rootMargin: '0px',
threshold: 0
}
var observer = new IntersectionObserver(callback, options);
But it only seems to be firing when the top of the element scrolls in and hits the bottom of the viewport, but not both. Ideas?
javascript intersection-observer
asked Nov 14 '18 at 18:12
Barry HorbalBarry Horbal
111
add a comment |
Is there a way to detect if an element leaves the viewport using Intersection Observers? For example, I have an element on the screen that I want to fire a callback when the top of the element hits the top of the viewport. From MDN:
The Intersection Observer API lets code register a callback function that is executed whenever an element they wish to monitor enters or exits another element (or the viewport), or when the amount by which the two intersect changes by a requested amount. -- (https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API)
So if I do something like below, I would have thought that the callback would have fired when the top of the element hit the top of the viewport as well?
var options = {
root: document.querySelector('#element'),
rootMargin: '0px',
threshold: 0
}
var observer = new IntersectionObserver(callback, options);
But it only seems to be firing when the top of the element scrolls in and hits the bottom of the viewport, but not both. Ideas?
javascript intersection-observer
asked Nov 14 '18 at 18:12
Barry HorbalBarry Horbal
111
Is there a way to detect if an element leaves the viewport using Intersection Observers? For example, I have an element on the screen that I want to fire a callback when the top of the element hits the top of the viewport. From MDN:
The Intersection Observer API lets code register a callback function that is executed whenever an element they wish to monitor enters or exits another element (or the viewport), or when the amount by which the two intersect changes by a requested amount. -- (https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API)
So if I do something like below, I would have thought that the callback would have fired when the top of the element hit the top of the viewport as well?
var options = {
root: document.querySelector('#element'),
rootMargin: '0px',
threshold: 0
}
var observer = new IntersectionObserver(callback, options);
But it only seems to be firing when the top of the element scrolls in and hits the bottom of the viewport, but not both. Ideas?
javascript intersection-observer
javascript intersection-observer
asked Nov 14 '18 at 18:12
Barry HorbalBarry Horbal
111
asked Nov 14 '18 at 18:12
Barry HorbalBarry Horbal
111
asked Nov 14 '18 at 18:12
Barry HorbalBarry Horbal
111
asked Nov 14 '18 at 18:12
Barry HorbalBarry Horbal
111
asked Nov 14 '18 at 18:12
Barry HorbalBarry Horbal
111
111
add a comment |
add a comment |
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