I am searching for a method to add animation effects (using @keyframes, transform...) to certain elements as the user scrolls down the page. For instance:
div will have a height of 100px.div changes to a height of 50px and becomes blue.Is it possible to achieve this using only CSS? If not, what are the most effective ways to accomplish this with HTML or JavaScript?
To create a smooth animation effect on an element based on scroll position, the most efficient method is to utilize a scroll function by adding a specific class:
myID = document.getElementById("myID");
var myScrollFunc = function() {
var y = window.scrollY;
if (y > 500) {
// myID.style.backgroundColor = "blue"; // you can add individual styles
myID.className = "blue" // or add classes
} else {
// myID.style.backgroundColor = "red";
myID.className = "red"
}
};
window.addEventListener("scroll", myScrollFunc);body {
height: 1100px;
}
#myID {
position: fixed;
height: 100px;
line-height: 20px;
transition: all 1s;
}
.blue {
background: blue;
animation: myAnimation 1s both;
}
.red {
background: red;
}
@keyframes myAnimation {
0% {
border-radius: 0px;
line-height: 10px;
}
100% {
border-radius: 100%;
line-height: 100px;
}
}<div id="myID" class="red">Hello world</div>Additional Resources:
It seems that using pure CSS alone is not able to detect scrolling behavior. However, you can achieve this functionality by utilizing jQuery:
$(document).scroll(function() {
var scrollPosition = parseInt($(document).scrollTop())
if(scrollPosition == 0) {
$('.yourDivClass').css({
height: '100px',
color: '#fff'
})
}
if (scrollPosition > 0 && scrollPosition <= 100) {
$('.yourDivClass').css({
height: '50px',
color: 'blue'
})
}
console.log(scrollPosition)
})
To create a smooth transition effect, it is recommended to define transitions in your CSS file:
.yourDivClass {
transition: height 0.5s ease;
}
Scrolling is like a dance of sorts. When you move your mouse or use the scroll bar, the performance begins and actions are set in motion. You won't find any magic wand in Pure CSS to tame these wild events. It's just not possible.
There are those who might debate that even :hover falls into the event category. Indeed, it's an anomaly nestled within CSS, behaving differently from its counterparts.
Using solely CSS: not possible.
However, you could create a class with keyframed animation and trigger it to be applied to an element when it is scrolled into view. This way, the element will begin animating once the class is added.
Utilize Waypoints.js to define the actions triggered when a certain element on a webpage is reached.
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