Looking to expand upon the solution given in this response. The existing code effectively fades in an element while scrolling down and fades out an image when scrolling up; however, it lacks the functionality to fade out when scrolling down. I am aiming to incorporate all these elements: fading in while scrolling down, fading out as the element exits the viewport, fading in while scrolling up, and finally, fading out as the element leaves the viewport.
For achieving the desired outcome, you can utilize the Intersection Observer API instead of relying on jQuery and scroll event listener. The Intersection Observer API allows you to observe when elements intersect with a specific target.
If necessary, you have the flexibility to adjust the threshold option of the IntersectionObserver as per your requirements. This option determines the percentage of visibility at which the observer's callback should be executed. In this example, I have set it to 70%.
const observerOptions = {
root: null,
rootMargin: "0px",
threshold: 0.7
};
function observerCallback(entries, observer) {
entries.forEach(entry => {
if (entry.isIntersecting) {
// Apply fade in effect to visible observed elements
entry.target.classList.replace('fadeOut', 'fadeIn');
} else {
// Apply fade out effect to non-visible observed elements
entry.target.classList.replace('fadeIn', 'fadeOut');
}
});
}
const observer = new IntersectionObserver(observerCallback, observerOptions);
const fadeElms = document.querySelectorAll('.fade');
fadeElms.forEach(el => observer.observe(el));.fade {
margin: 50px;
padding: 50px;
background-color: lightgreen;
transition: opacity 0.7s ease-in;
}
.fadeOut { opacity: 0; }
.fadeIn { opacity: 1; }<div class="container">
<div class="fade fadeOut">Element 1</div>
<div class="fade fadeOut">Element 2</div>
<div class="fade fadeOut">Element 3</div>
<div class="fade fadeOut">Element 4</div>
<div class="fade fadeOut">Element 5</div>
<div class="fade fadeOut">Element 6</div>
<div class="fade fadeOut">Element 7</div>
<div class="fade fadeOut">Element 8</div>
<div class="fade fadeOut">Element 9</div>
<div class="fade fadeOut">Element 10</div>
</div>Here is the code snippet I am working with: <button class="btn">New York</button> <button class="btn">Amsterdam</button> <button class="btn">New Jersey</button> <button class="btn&qu ...
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