How Do I Acitvate The Animation When The Scroll Reaches The Content In Html
CSS Scroll animations are a great style to bring tedious and static sites to life and give the reader a more interesting, unique, and modern experience.
In this post, you volition learn how to trigger CSS animations on scroll. (If you are looking for examples, check out our curated list of CSS text animations)
And... who knows? Maybe you finish up doing amazing websites like these scrolling animation websites.
Roll animations are whatever kind of animation taking place while the company scrolls up or downwardly a website. Usually the scrolling animation is triggered when the element comes into view and information technology can be applied to practically any chemical element such as text, images, and videos.
Our eyes are naturally attracted to movement and then this feature will entice and keep the visitor engaged. Adding eye-catching animations to your website volition brand it stand out from the rest.
Whatsoever CSS Curl animation normally involves the use of a plugin or library simply nosotros are going to evidence you lot how to achieve this without those. So, let's go to information technology.
Vanilla JavaScript, despite its fancy name, is not a library, information technology is simply obviously sometime JavaScript. So don't get confused by the "fancy" name.
1. Setup the Page
Commencement things first, create a web page. Just a simple layout with multiple sections.
<department class = "container" >
<h2 > Caption </h2 >
<div class = "text-container" >
<div class = "text-box" >
<h3 > Section Text </h3 >
<p > Random text </p >
</div >
<div grade = "text-box" >
<h3 > Section Text </h3 >
<p > Random text </p >
</div >
<div class = "text-box" >
<h3 > Department Text </h3 >
<p > Random text </p >
</div >
</div >
</section > ii. Styling the Page with CSS
Add mode attributes to your page and use CSS to define the coil blitheness way, At present you need the grade, reveal for the sections you are animating and a new class name, agile, for when it's activated.
.reveal {
position : relative;
transform : translateY (150px) ;
opacity : 0;
transition : 2s all ease;
}
.reveal.active {
transform : translateY (0) ;
opacity : 1;
} With this, the reveal elements will be subconscious until the active class is added. The transform and transition attributes define the ringlet animation style, with this, the sections will fade in from the bottom and motility, along the y-axis, towards the top. You lot can check this CSS Transition guide if you have whatsoever doubts.
iii. Create JavaScript Functions to Target the Elements
Nosotros volition need these functions to assign the new class proper name when they enter the viewport and we need it to trigger CSS animations on coil.
Start by targeting all the reveal elements using certificate.querySelectorAll().
role reveal ( ) {
var reveals = document. querySelectorAll ( ".reveal" ) The scrolling blitheness needs to be triggered when information technology comes into view and then we need to make up one's mind the element's position on the page, that is, the distance of the chemical element from the pinnacle of the viewport.
getBoundingClientRect().elevation gives usa this distance from the top of the viewport and window.innerHeight will give united states of america the height of the viewport.
With this, we tin can set the weather condition using for;
for ( var i = 0 ; i < reveals.length; i++ ) {
var windowHeight = window.innerHeight;
var elementTop = reveals[i] . getBoundingClientRect ( ) .top;
var elementVisible = 150 ;
}
The variable, windowHeight is the height of the viewport, elementTop is the distance of the reveal element from the top of the viewpoint or, the length that has been scrolled, and elementVisible is the height at which the element should exist revealed to the user.
You can decide when an chemical element has scrolled a certain number of pixels into the page. Now define a function that displays the elements by adding and removing the active class. For this. employ if and else statements. These will fix the atmospheric condition for triggering the animation
if (elementTop < windowHeight - elementVisible) {
reveals[i] .classList. add ( "active" ) ;
} else {
reveals[i] .classList. remove ( "active" ) ;
} The consummate office will await like this;
function reveal ( ) {
var reveals = certificate. querySelectorAll ( ".reveal" ) ;
for ( var i = 0 ; i < reveals.length; i++ ) {
var windowHeight = window.innerHeight;
var elementTop = reveals[i] . getBoundingClientRect ( ) .top;
var elementVisible = 150 ;
if (elementTop < windowHeight - elementVisible) {
reveals[i] .classList. add ( "active" ) ;
} else {
reveals[i] .classList. remove ( "agile" ) ;
}
}
}
Now we just pass it into an issue listener to run it every time the visitor scrolls the page in any direction.
window. addEventListener ( "gyre" , reveal) ; // To check the scroll position on page load
reveal ( ) ;
That'due south it! You have accomplished CSS scroll animation.
See the Pen on CodePen.
Simply, what if yous want more? Correct now, every section has the aforementioned uniform animation. Let'southward requite each department a dissimilar scroll animation style.
iv. Animate with CSS
First, we will assign classes in the HTML so we can reference them later on in our CSS to create the animations we want.
Here's how we would practice it in our beginning section:
<section form = "container" >
<h2 > Caption </h2 >
<div class = "text-container reveal fade-bottom" >
<div form = "text-box" >
<h3 > Section Text </h3 >
<p > Random text </p >
</div >
<div form = "text-box" >
<h3 > Section Text </h3 >
<p > Random text </p >
</div >
<div form = "text-box" >
<h3 > Section Text </h3 >
<p > Random text </p >
</div >
</div >
</section > And the same applies to whatsoever other sections we have in our HTML.
And so, in our CSS we can assign them different animations similar so:
.reveal {
position : relative;
opacity : 0;
}
.reveal.active {
opacity : 1;
}
.active.fade-bottom {
animation : fade-lesser 1s ease-in;
}
.agile.fade-left {
animation : fade-left 1s ease-in;
}
.active.fade-right {
animation : fade-correct 1s ease-in;
}
Define the animations using Keyframes. The transform style aspect can bring a dynamic feel to your page and it can be added here. Another aspect you can add is transition, which is the time it takes for the element to load completely, but the 1s in the animation aspect achieve the aforementioned upshot.
@keyframes fade-lesser {
0% {
transform : translateY (50px) ;
opacity : 0;
}
100% {
transform : translateY (0) ;
opacity : 1;
}
}
@keyframes fade-left {
0% {
transform : translateX (-100px) ;
opacity : 0;
}
100% {
transform : translateX (0) ;
opacity : 1;
}
}
@keyframes fade-right {
0% {
transform : translateX (100px) ;
opacity : 0;
}
100% {
transform : translateX (0) ;
opacity : i;
}
} You can change the transform values and animation attributes to accomplish more diverseness.
5. Final Consequence
See the Pen on CodePen.
You could animate individual blocks of text, let each paragraph load one afterward the other. Just assign the class name to whatever you want, style and animate with CSS, sprinkle a fiddling vanilla Js and picket the magic.
To add together some other applied case of using animations on scroll, we will breathing a navigation bar based on the scroll position of the page.
Nosotros tin can employ our previous example and add a navigation bar to it. Let'southward meet how to do it.
Feel free to check out how to create a glutinous or fixed navbar if you want to get into more details.
i. Setup the NavBar to animate
First, the HTML:
<nav >
<a href = "#dwelling" class = "agile" > Home </a >
<a href = "#about" > Most </a >
<a href = "#services" > Services </a >
<a href = "#contact" > Contact </a >
</nav > 2. Style the NavBar With CSS
a {
text-decoration : none;
}
ul {
list-manner : none;
}
header {
position : fixed;
summit : 0;
left : 0;
width : 100%;
z-alphabetize : 1000;
background : #42455a;
padding : 20px;
text-align : centre;
edge-bottom : 1px solid #00c2cb;
}
header nav a {
padding : 10px 20px;
font-size : 2rem;
colour : #e0ffff;
border-radius : 5px;
letter-spacing : 0.5px;
} Then y'all add together the link styling for when the blitheness becomes agile, y'all can combine this with the hover style, information technology's your pick;
header nav a:hover,
header nav a.active {
background : #00c2cb;
color : #42455a;
transition : 0.5s ease-out;
letter-spacing : 2px;
} 3. Using JavaScript to Breathing Our Navigation Bar
Commencement target all the sections and links;
let section = document. querySelectorAll ( 'department' ) ;
et menu = document. querySelectorAll ( 'header nav a' ) ; Merely like the first case, you want the navbar to be animated when the department is scrolled into view, for that, create an onscroll event and use forEach to call the function. For this, nosotros need to declare the parameters and set up the condition.
window. onscroll = ( ) => {
section. forEach ( i => {
permit top = window.scrollY;
let starting time = i.offsetTop - 150 ;
let height = i.offsetHeight;
let id = i. getAttribute ( 'id' ) ; pinnacle is the variable for scrollY, which is the length or number of pixels the viewport has been scrolled. offsetTop is the length of the chemical element from the acme of the viewport. offsetHeight is the length of the sections and getAttribute() returns the value of an elements attributes, in this case, the id of the sections.
Side by side, the conditions for execution so the links get agile equally you roll downward the page. The section should be within the viewport and so, the offset should be less than the length you whorl and also, the length from the top of the viewport and the length of the section or element should be more than than the length you accept scrolled;
if (top >= offset && summit < offset + elevation) {
carte du jour. forEach ( link => {
link.classList. remove ( 'active' ) ;
document. querySelector ( 'header nav a[href*=' + id + ']' ) .classList. add ( 'active' ) ;
And then now, when you scroll into a new section, the condition is met and the active attributes will exist moved to the adjacent link.
Put it all together and information technology looks like this;
let section = document. querySelectorAll ( 'section' ) ;
permit menu = certificate. querySelectorAll ( 'header nav a' ) ;
window. onscroll = ( ) => {
section. forEach ( i => {
allow top = window.scrollY;
let kickoff = i.offsetTop - 150 ;
let height = i.offsetHeight;
allow id = i. getAttribute ( 'id' ) ;
if (peak >= commencement && summit < offset + height) {
menu. forEach ( link => {
link.classList. remove ( 'active' ) ;
document. querySelector ( 'header nav a[href*=' + id + ']' )
.classList. add ( 'active' ) ;
} ) ;
}
} ) ;
} ; 4. Result: CSS Scroll Animation + NavBar!
See the Pen on CodePen.
Yous tin add the smooth curl-behavior attribute to give your website a truly dynamic feel. Brand tweaks to the blitheness and transform style attributes and come across what happens. Add a transition-delay to make it even more than dramatic (check how to configure this attribute in this CSS Transition guide)
Conclusion
The curlicue animation result is a popular blitheness in todays websites and provide them with a modern and more dynamic expect.
There are many other ways to create animations on scroll such as using components like fullPage.js that will combine animations and scroll in a beautiful way. Fullpage works by snapping full-screen sections into view when the visitor scrolls creating quite a unique and interesting user experience.
And there are many other cool animations y'all tin use on gyre. Simply choose the 1 that fits your needs and creates the all-time scrolling experience for your visitors and page.
Related articles
- 7 whorl text animations [CSS & JS]
- Prevent Scroll On Scrollable Elements [JS & CSS]
- Create jQuery polish scrolling [3 ways]
- x absurd CSS animations to add to your site
- CSS scroll snap - Scroll Horizontally
Source: https://alvarotrigo.com/blog/css-animations-scroll/
Posted by: croninknines.blogspot.com
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