Develop Reference

how to revese a css-animation after trigger it?

Good evening, I'm a beginner front-end developer who is trying to implement sketches of Pinterest for training.
I've found this gif for the signup/login page but I have a major issue for implementing animation, I don't have any idea for reversing the animation when the user clicks on the signup button can anybody tell me how can I reverse an animation?
function animation() {
var element = document.getElementById("containerForm")
element.classList.add("slide")
}
.containerForm {
width:50px;height:50px;background-color:red;
}
.slide {
animation: slide 2s ease-in-out;
position: relative;
animation-fill-mode: forwards;
}
#keyframes slide {
0% {
transform: translateX(0);
}
100% {
transform: translateX(100%);
overflow: hidden;
visibility: visible;
}
}
<div class="containerForm" id="containerForm">
<form></form>
</div>
<button onclick="animation()">click</button>
but as I've said I don't have an idea for the second step
Link of gif

you can add another css class and make use of the animation-direction property.
ie
.slide-back{
animation: slide 2s ease-in-out;
position: relative;
animation-direction: reverse;
}

function animation() {
var element = document.getElementById("containerForm")
element.classList.add("slide")
}
function reverse() {
var element = document.getElementById("containerForm")
element.classList.remove("slide")
}
.containerForm {
width:50px;
height:50px;
background-color:red;
transform: translateX(0);
transition: transform 2s;
}
.slide {
transform: translateX(100%);
}
<div class="containerForm" id="containerForm">
<form></form>
</div>
<button onclick="animation()">click</button>
<button onclick="reverse()">click</button>

transition works too:
example:
*{margin:0;}
#tst {
display: grid;
grid-template-columns: repeat(2, 1fr);
min-height: 100vh;
background: #555;
}
label {
margin: auto;
appearance: button;
cursor: pointer;
min-width: 6em;
text-align: center;
}
#a,
#b {/*hides radios */
position: absolute;
right: 100vw;
}
[for="a"],
#c {
grid-row: 1;
grid-column: 1;
}
#c {
display: grid;
grid-template-columns: 1fr;
grid-template-rows: auto 1fr;
background: white;
border: solid;
transition: 0.5s;
font-size:2vw;
}
#a:checked~#c {
transform: translatex(0)
}
#b:checked~#c {
transform: translatex(100%)
}
h1 {
margin: auto;
}
#c p[class] {
margin: auto;
grid-column: 1;
grid-row: 2;
transition: 0.25s;
background: inherit;
color: #164fb7;
font-size: 3vw;
}
#c p.b {
opacity: 0;
color: tomato;
}
#b:checked~#c p.b {
opacity: 1
}
/* there were no js nor animation nor absolute positionning ;) */
<div id="tst">
<input id="a" type=radio name=toggle>
<input id="b" type=radio name=toggle>
<label for="a">Left</label>
<label for="b">Right</label>
<div id="c">
<h1>here or there ?</h1>
<p class="a">Standing on the left</p>
<p class="b">Standing on the right</p>
</div>
</div>

Instead of adding a class I suggest using the animation-play-state property and adding event listeners:
one click listener to the button
one animationiteration to the div
simply change the play state from paused to running
Let me show you what I mean:
const element = document.getElementById("containerForm");
const btn = document.querySelector("button");
function animation() {
element.style.animationPlayState = "running";
}
function stopAnimation() {
element.style.animationPlayState = "paused";
}
btn.addEventListener("click", animation);
element.addEventListener("animationiteration", stopAnimation);
.containerForm {
width: 50px;
height: 50px;
background-color: red;
animation: slide 2s ease-in-out infinite alternate paused;
}
#keyframes slide {
0% {
transform: translateX(0);
}
100% {
transform: translateX(100%);
}
<div class="containerForm" id="containerForm">
<form></form>
</div>
<button>click</button>

Vue js add animate for element when route page

I just want to animate specific element when route page load complete. its not route page transition. i have tried many ways. its a progress bar animate percentage of dynamicly from data value. i have tried mount destroyed method for change class but its not working.
my requirement is i want to pass value from data and according to the value, the progress bar shour be animate when page load.
enter image description here
<div class="media-body">
<div class="progress">
<div class="progress-bar progress-bar-warning" v-bind:class="{rating: isAnimate}">
</div>
</div>
</div>
.mybar {
height: 5px;
overflow: hidden;
background-color: #C1C2C1;
box-shadow: none;
}
.myactivebar {
background-color: #B01058;
float: left;
box-shadow: none;
transition: width 1s ease;
height: 100%;
width: 40%;
}
.rating {
width:100%;
}
data() {
return {
isAnimate: false,
technologies:[
{
title:'Vue Js',
info:'progressive framework for building user interfaces.',
logo:'https://vuejs.org/images/logo.png',
rate:90
},
]
}
}

This is actually what I want.
enter image description here
and I got the solution below
#-moz-keyframes animate-bar {
0% { width: 0%; }
}
#-webkit-keyframes animate-bar {
0% { width: 0%; }
}
#-ms-keyframes animate-bar {
0% { width: 0%; }
}
#-o-keyframes animate-bar {
0% { width: 0%; }
}
#-keyframes animate-bar {
0% { width: 0%; }
}
.chart {
background-color: #DADADA;
height: 2px;
position: relative;
}
.chart .bar {
background-color: #3D98C6;
height: 100%;
-moz-animation: animate-bar 1.25s 1 linear;
-webkit-animation: animate-bar 1.25s 1 linear;
-ms-animation: animate-bar 1.25s 1 linear;
-o-animation: animate-bar 1.25s 1 linear;
animation: animate-bar 1.25s 1 linear;
}
<div class="chart">
<div class="bar" style="width:60%;"></div>
</div>

How to adjust section margin after transition

I have a div that transitions on the Y-axis by 100px. I am wanting my blue div #home-section3 to not have any top margin from .home-section2 after the transition, but ideally I do not want to have to set the margin-top to -100px for every div below the transition div. Is there a different way in which I can get the white-space gap to not appear after the transition finishes?
Here is a fiddle.
function section2Delays() {
$('.home-section2').addClass('fadeDisplay');
};
setTimeout(section2Delays, 300);
.home-section2 {
display: inline-block;
width: 50%;
height: 300px;
vertical-align: top;
margin-top: 100px;
opacity: 0;
transition: 1s;
-webkit-transition: 1s;
background: green;
}
.home-section2.fadeDisplay {
transform: translateY(-100px);
-webkit-transform: translateY(-100px);
transition: 1s;
-webkit-transition: 1s;
opacity: 1;
}
#home-section3 {
width: 100%;
max-width: 100%;
height: auto;
background: #094765;
padding: 50px 0;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class="home-section2"></div>
<section id="home-section3"></section>

add margin-bottom:-100px in class .fadeDisplay
function section2Delays() {
$('.home-section2').addClass('fadeDisplay');
};
setTimeout(section2Delays, 300);
.home-section2 {
display: inline-block;
width: 50%;
height: 300px;
vertical-align: top;
margin-top: 100px;
opacity: 0;
transition: 1s;
-webkit-transition: 1s;
background: green;
}
.home-section2.fadeDisplay {
transform: translateY(-100px);
-webkit-transform: translateY(-100px);
transition: 1s;
-webkit-transition: 1s;
opacity: 1;
margin:0 0 -100px 0 ;
}
#home-section3 {
width: 100%;
max-width: 100%;
height: auto;
background: #094765;
padding: 50px 0;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class="home-section2"></div>
<section id="home-section3"></section>

You can probably use margin-top instead of transform.
.fadeDisplay {
margin-top: 0;
}
jsFiddle
In fact, the whole animation can be done with CSS only.
.home-section2 {
margin-top: 100px;
opacity: 0;
animation: ani 2s forwards;
}
#keyframes ani {
to {
margin-top: 0;
opacity: 1;
}
}
jsFiddle

Create a folding animation of a simple square

I am trying to make this animation. This animation is quite complicated, but all I would like to do is fold a square in half showing the folding animation.
I have visited this website and I tried to use the skew function in order to create the animation.
This is the code I have used so far:
.elementLeft {
display: inline-block;
background-color: #aaaaaa;
height: 100px;
width: 100px;
font-size: 1px;
animation: shakeback 2s infinite;
animation-direction: alternate;
color: white;
}
.elementRight {
display: inline-block;
background-color: #aaaaaa;
height: 100px;
width: 100px;
/* transform: skew(20deg); */
font-size: 1px;
color: white;
animation: shake 2s infinite;
animation-direction: alternate;
}
#keyframes shake {
0% {
transform: skewY(0deg);
}
100% {
transform: skewY(45deg);
}
}
#keyframes shakeback {
0% {
transform: skewY(0deg);
}
100% {
transform: skewY(-45deg);
}
}
body,
html {
height: 100%;
}
body {
display: flex;
align-items: center;
justify-content: center;
}
<div class="elementLeft"></div>
<div class="elementRight">
</div>
However, this is not exactly what I want since the skew function also makes the square too long as I increase the degree. I have been thinking of another way to create this animation, but I am not sure what to do. I also would prefer that only one side folds in rather than both sides folding. This is like in the Google Calendar Icon animation posted above where the top half of the icon stays still whereas the bottom half folds upwards.
edit: I have also noticed that I can rotate a square upwards to form this effect. However, I am still having an issue as the animation does not look as smooth as I would like.
Any help is once again appreciated!
.element {
display: inline-block;
background-color: #000000;
height: 100px;
width: 100px;
}
.elementfold {
/* transform: rotateX(0deg); */
animation: foldup 5s;
display: inline-block;
background-color: #aaaaaa;
height: 100px;
width: 100px;
}
#keyframes foldup {
0% {
transform: rotateX(0);
}
100% {
transform: rotateX(180deg) translate(0px, 100px);
}
}
<li>
<div class="element"></div>
</li>
<li>
<div class="elementfold"></div>
</li>

This may be useful. I haven't tried it myself, but I'd look into it.
http://anime-js.com/

Code:
#container {
width: 100px;
height: 100px;
perspective: 300px;
}
.square {
width: 100px;
height: 100px;
background-color: grey;
}
#animation {
animation: anim 2s linear 0s infinite alternate;
transform-origin: 50% 100%;
}
#keyframes anim {
from {transform: rotateX(0deg);}
to {transform: rotateX(-180deg);}
}
<div id="container">
<div class="square" id="animation"></div>
<div class="square"></div>
</div>
Using CSS3's rotateX property and animations, it's pretty easy to create folding squares.

Credit goes to Bálint for the animations!
The above method will need to be slightly tweaked the object is rounded. In the case that the folding animation needs to be applied to a circle or an oval, it can be done by breaking the shape into two shapes; more specifically, the circle would be broken into two semicircles.
The following code shows one solution for this using HTML and LESS (for this reason it will not load on stackoverflow):
#size: 200px;
.origin (#x;
#y) {
-webkit-transform-origin: #x #y;
-moz-transform-origin: #x #y;
-o-transform-origin: #x #y;
transform-origin: #x #y;
}
.red {
background-color: #f24235;
}
.green {
background-color: lightgreen;
}
.top-half {
width: #size;
height: (#size / 2);
border-radius: (#size / 2) (#size / 2) 0 0;
}
.bottom-half {
width: #size;
height: (#size / 2);
border-radius: 0 0 (#size / 2) (#size / 2);
.origin(0, 0);
}
#animation {
animation: anim 2s linear 0s infinite alternate;
// transform-origin: 50% 100%;
}
#container {
width: 100px;
height: 100px;
perspective: 300px;
}
#keyframes anim {
from {
transform: rotateX(0deg);
}
to {
transform: rotateX(180deg);
}
}
<div class "container">
<div class="top-half red"></div>
<div class="bottom-half green" id="animation"></div>
</div>
Please follow this link to see the animation. If there are any other efficent ways to do this with a variable size, but through either normal css or js please let me know!

get #keyframe current value in css3 with javascript

See the demo here:
http://jsfiddle.net/hamidrezabstn/fgcPa/5/
When I click on the middle raindrop , I would like it to rotate to the current position of the spinning circle! I tried below the JS code but it doesn't work! The next thing I want to do is the raindrop rotate with spining circle!
$(function() {
$('#center').click(function() {
var pos = $('#circle').css('transform')
$(this).css('transform', 'pos')
});
});

$(function() {
$('#center').click(function() {
var obj, matrix;
obj = document.getElementById('circle');
matrix = getComputedStyle(obj).getPropertyValue('transform');
console.log(matrix);
//$(this).css('transform', matrix)
});
});
read more here http://dev.opera.com/articles/view/understanding-3d-transforms/

EDITED: I said that it is not posible to get the current status of the transform in an animation, but I was wrong. Sorry about that !
To do what you want, any way, you don't need really to get it; just use it.
I have changed slightly your HTML to put the raindrop inside the rotating div.
Then, with this CSS:
.raindrop {
background:center blue;
width:50px;
height:50px;
border-radius: 100%;
border-top-left-radius: 0;
position: absolute;
margin: auto;
left: 75px;
top: 75px;
animation: ccircle 5s infinite linear;
-webkit-animation: ccircle 5s infinite linear;
}
.raindrop:hover {
animation: none;
-webkit-animation: none;
}
.axis {
width: 200px;
height: 200px;
transform: scaleX(2);
background-color: none;
border: 1px solid black;
left: 50px;
position: absolute;
top: 50px;
border-radius: 50%;
}
.rotate {
width: 100%;
height: 100%;
top: 0px;
animation: circle 5s infinite linear;
-webkit-animation: circle 5s infinite linear;
transform-origin: 50% 50%;
-webkit-transform-origin: 50% 50%;
position: absolute;
}
.counterrotate {
width: 50px;
height: 50px;
animation: ccircle 5s infinite linear;
-webkit-animation: ccircle 5s infinite linear;
}
.planet {
width: 50px;
height: 50px;
position: absolute;
border-radius : 50px;
left: 0px;
top: 0px;
background-color: red;
display: block;
}
#keyframes circle {
from { transform: rotateZ(0deg) }
to { transform: rotateZ(360deg) }
}
#-webkit-keyframes circle {
0% { -webkit-transform: rotateZ(0deg) }
100% { -webkit-transform: rotateZ(360deg) }
}
#keyframes ccircle {
from { transform: rotateZ(360deg) }
to { transform: rotateZ(0deg) }
}
#-webkit-keyframes ccircle {
from { -webkit-transform: rotateZ(360deg) }
to { -webkit-transform: rotateZ(0deg) }
}
You got this fiddle
In it, the raindrop is always rotating with the axis div. But it is also counter-rotating, so it appears to be static.
When you hover it, the count-rotation is disabled, and it points to red circle. And will continue to do so as long as you hover it.
To do that thru a click, just asociate the :hover properties to a class, and set this class in the click.