The 'root element' parallax technique

Developer
Maheshc
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4,235 Kb
Views
24,288
  1. The 'root element' parallax technique Previews
  2. The 'root element' parallax technique HTML Codes
  3. The 'root element' parallax technique CSS Codes
  4. The 'root element' parallax technique JS Codes

How do I make an the 'root element' parallax technique?

By combining the power of rem and a small JavaScript function to manipulate the font-size of the html element, we can achieve simple but effective parallaxing.. What is a the 'root element' parallax technique? How do you make a the 'root element' parallax technique? This script and codes were developed by Maheshc on 28 November 2022, Monday.

The 'root element' parallax technique Previews
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The 'root element' parallax technique - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>The 'root element' parallax technique</title> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css"> <link rel='stylesheet prefetch' href='https://fonts.googleapis.com/css?family=Oswald:400,300,700'> <link rel="stylesheet" href="css/style.css">
</head>
<body> <h1 class="parallax">The &lsquo;root element&rsquo; parallax technique</h1>
<img src="https://distilleryimage4.s3.amazonaws.com/631dac84d67611e1a7d81231381b5136_7.jpg" class="parallax skyline ">
<img src="https://distilleryimage4.s3.amazonaws.com/16fe826ee3b511e1a47b22000a1cf766_7.jpg" class="parallax blimp">
<img src="https://distilleryimage11.s3.amazonaws.com/07354ffe2f3011e2a23c22000a1f9d66_7.jpg" class="parallax gherkin">
<img src="https://distilleryimage4.s3.amazonaws.com/059c1a748e6311e1b10e123138105d6b_7.jpg" class="parallax dino">
<img src="https://distilleryimage10.s3.amazonaws.com/7ec10646ab5d11e1af7612313813f8e8_7.jpg" class="parallax bull">
<div class="parallax box"> <p>By combining the power of <code>`rem`</code> and a small JavaScript function to manipulate the <code>`font-size`</code> of the <code>`html`</code> element, we can achieve simple but effective parallaxing.</p> <p>Setting all our positions and parallax movements in CSS, this technique minimises DOM manipulations to just one &ndash; on the <code>`html`</code> element &ndash; boosting overall performance.</p> <p>The speed and direction of each element is set using margins (for this demo I've used <code>`margin-top`</code>). Play around with the numbers yourself to get a better understanding.</p> <p>This is just a proof of concept and hasn't been fully tested, though it should work everywhere that supports <code>`rem`</code> (<a href="http://caniuse.com/#feat=rem">see here</a>). Using <code>`rem`</code> in this way does have its pitfalls &ndash; most notably the loss of its traditional usage &ndash; but it's a nice trick.</p>
</div>
<a href="https://codepen.io/amustill/full/aoFIm" target="_blank" class="parallax btn">View full screen</a> <script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script> <script src="js/index.js"></script>
</body>
</html>

The 'root element' parallax technique - Script Codes CSS Codes

/** * Parallax styles * * All aesthetic styles are at the bottom for the benefit of better understanding the demo. */
html { /* Give our document a fake height for demo purposes. */	height: 1500px; /* We must set out root `font-size` to 0 to prevent our parallax margins being calculated */ font-size: 0;	}
body { /* Reset the `font-size` to 16px/1em/100% */ font-size: 16px;
}
/* Fix our parallax elements in position */
.parallax {	position: fixed;	}
/** * Position our elements * * Firstly we set our element position using `top`, `right`, `bottom`, `left`, then set your parallax movement using `margin` and `rem`. * * In this demo our 'base factor' is 50 (see JavaScript). Our 'factor' calculation never exceeds this number (when the viewport is fully scrolled), which means our `rem` calculations are based on this number. * * Example: * * If I set my `top` to `200px` and want this element to shift up by `400px`, our `rem` value is 400/10, or `-40em` (using negative margins to shift upwards). */
h1 {	top: 75px;	margin-top: -3rem;	z-index: 5;
}
.box {	top: -1400px; /* Positive margin, so it appears from above */	margin-top: 29rem; /* Center and pad */ left: 50%; margin-left: -27%;	padding: 2%;	width: 50%;
}
.btn { top: 5em; right: -800px; margin-right: 18.5rem;
}
.skyline {	top: 240px;	margin-top: -28rem;	left: 8%;
}
.blimp {	top: 320px;	margin-top: -55rem;	left: 24%;
}
.gherkin {	top: 200px;	margin-top: -20rem;	left: 40%;	z-index: 10;
}
.bull {	top: 360px;	margin-top: -47rem;	left: 56%;
}
.dino {	top: 260px;	margin-top: -33rem;	left: 72%;
}
/** * Demo aesthetics */
html {	background: #233c38 url('https://goo.gl/5wJBu') 50% 50%;	background-attachment: fixed;	background-size: 100% auto; font-family: sans-serif; font-weight: 300; line-height: 1.5;	color: #fff;
}
a { color: #fff; text-decoration: none; border-bottom: 1px dotted;
}
a:hover { color: magenta;
}
h1 { width: 100%; font: 3em/1 'Oswald', sans-serif;	text-align: center;	text-transform: uppercase;	text-shadow: 3px 3px 20px rgba(0, 0, 0, 0.5);
}
p { margin: 0 0 1.5em;
}
p:last-child { margin-bottom: 0;
}
img {	width: 20%;	box-shadow: 0 0 20px rgba(0, 0, 0, 0.4);
}
code { background-color: #222; color: magenta;
}
.box {	background-color: rgba(255, 255, 255, 0.1);
}
.btn { display: inline-block; padding: 0.5em 1em; background-color: rgba(0, 0, 0, 0.5); border-bottom: 0;
}

The 'root element' parallax technique - Script Codes JS Codes

// Variables
var viewport = $(window), root = $('html'), maxScroll;
// Bind events to window
viewport.on({ scroll: function() { // Grab scroll position var scrolled = viewport.scrollTop(); /** * Calculate our factor, setting it as the root `font-size`. * * Our factor is calculated by multiplying the ratio of the page scrolled by our base factor. The higher the base factor, the larger the parallax effect. */ root.css({ fontSize: (scrolled / maxScroll) * 50 }); }, resize: function() { // Calculate the maximum scroll position maxScroll = root.height() - viewport.height(); }
}).trigger('resize');
The 'root element' parallax technique - Script Codes
The 'root element' parallax technique - Script Codes
Home Page Home
Developer Maheshc
Username maheshc
Uploaded November 28, 2022
Rating 3
Size 4,235 Kb
Views 24,288
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