I have a site and I want each section to take up the screen and as you scroll down the page the sections fade out as the next section comes into view. I'm struggling on how this math needs to work.
For one section it's easy which is basically the height of the element and it's distance from the top to get the opacity percentage. However, I just can't quite figure out the math for other sections. I need section 2 to start fading in as section 1 is fading out.
For the proper effect, for example, my math divides the height of the row by 2 so that it's 50% faded out as the next section should be fading in 50%. But, as of now, the math just doesn't work for the other sections.
This site is using vanilla JS as it's supposed to be a simple one pager.
Example below:
(function () {
window.addEventListener('scroll', () => {
const rows = document.querySelectorAll('.row');
rows.forEach(function (row, index) {
const distanceToTop = window.pageYOffset;
const elementHeight = row.offsetHeight * (index + 1) / 2;
row.style.opacity = ((elementHeight - distanceToTop) / elementHeight * 100) / 100;
});
});
})(); * {
box-sizing: border-box;
}
body {
margin: 0;
padding: 0 0 0 0;
font-family: sans-serif;
font-family: 'Manrope', helvetiva, sans-serif;
transition: background-color 1s;
color:#fff;
background: linear-gradient(0deg, #100521 0%, #50357c 50%, #878290 100%);
}
header {
position: fixed;
top: 0;
width: 100%;
background: #fff;
z-index: 999;
}
header h1 {
font-family: 'Lack';
font-size: 4em;
text-align: center;
padding: 10px;
color: #100521;
}
.row-container .row:first-child {
opacity: 1;
}
.row {
opacity: 0;
height: 100vh;
display: flex;
flex-direction:column;
}
.row-inner {
display: grid;
grid-template-columns: 1fr 1fr;
position: sticky;
top: 0;
/* border: 1px solid yellow; */
padding: 0;
height: 100vh;
}
.column {
display: flex;
flex-direction: column;
justify-content: center;
align-content: center;
flex: 50%;
padding: 10px;
}
.left-column {
background-color: transparent;
}
.right-column {
background-color: transparent;
}
h1 {
font-family: 'Unbounded', helvetica, sans-serif;
}
h1 {
margin: 0;
font-size: 36px;
}
h2 {
margin: 0;
font-size: 24px;
}
p {
margin: 10px 0;
font-size: 18px;
line-height: 1.5;
}
img {
width: 100%;
height: auto;
}<!DOCTYPE html>
<html>
<head>
<link rel="preconnect" href="https://fonts.googleapis.com"><link rel="preconnect" href="https://fonts.gstatic.com" crossorigin><link href="https://fonts.googleapis.com/css2?family=Manrope&family=Unbounded&family=Lack&display=swap" rel="stylesheet">
</head>
<body>
<header>
<h1>My App</h1>
</header>
<!-- First row -->
<div class="row-container">
<div class="row section-1">
<div class="row-inner">
<div class="column left-column">
<div class="column-inner">
<h1>Headline 1</h1>
<h2>Subhead 1</h2>
<p>Lorem Ipsum dolar Gamet</p>
</div>
</div>
<div class="column right-column">
<div class="column-inner">
<img src="https://avatars.dicebear.com/api/adventurer/team-member-1.jpg" alt="Image 1">
</div>
</div>
</div>
</div>
<!-- Second row -->
<div class="row section-2">
<div class="row-inner">
<div class="column left-column">
<div class="column-inner">
<h1>Headline 2</h1>
<h2>Subhead 2</h2>
<p>Lorem Ipsum dolar Gamet</p>
</div>
</div>
<div class="column right-column">
<div class="column-inner">
<img src="https://avatars.dicebear.com/api/adventurer/team-member-2.jpg" alt="Image 2">
</div>
</div>
</div>
</div>
<!-- Third row -->
<div class="row section-3">
<div class="row-inner">
<div class="column left-column">
<div class="column-inner">
<h1>Headline 3</h1>
<h2>Subhead 3</h2>
<p>Lorem Ipsum dolar Gamet</p>
</div>
</div>
<div class="column right-column">
<div class="column-inner">
<img src="https://avatars.dicebear.com/api/adventurer/team-member-3.jpg" alt="Image 3">
</div>
</div>
</div>
</div>
<!-- Fourth row -->
<div class="row section-4">
<div class="row-inner">
<div class="column left-column">
<div class="column-inner">
<h1>Headline 4</h1>
<h2>Subhead 4</h2>
<p>Lorem Ipsum dolar Gamet</p>
</div>
</div>
<div class="column right-column">
<div class="column-inner">
<img src="https://avatars.dicebear.com/api/adventurer/team-member-4.jpg" alt="Image 4">
</div>
</div>
</div>
</div>
</div>
</body>
</html>from Fade out one section and fade in the next section as you scroll on webpage
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