I have a less file that hide and display an element like the following:
.cmp-accordion__panel {
&--hidden {
display: none;
}
&--expanded {
display: block;
-webkit-animation: slide-down 0.5s ease-out;
-moz-animation: slide-down 0.5s ease-out;
}
}
#-webkit-keyframes slide-down {
0% {
opacity: 0;
-webkit-transform: translateY(-5%);
}
100% {
opacity: 1;
-webkit-transform: translateY(0);
}
}
#-moz-keyframes slide-down {
0% {
opacity: 0;
-moz-transform: translateY(-5%);
}
100% {
opacity: 1;
-moz-transform: translateY(0);
}
}
In my JavaScript, I toggle the class name of the element between "cmp-accordion__panel--hidden" and "cmp-accordion__panel--expanded" if the event is triggered. I use keyframe and opacity to animate the transition from "display:none" to "display:block".
However, when I go from "display:block" to "display:none" to hide the element, the effect happens INSTANTLY. What should I add to animate the hiding?
As already said, is not possible animate or transition from display:block; to display: none; but this could be simulated in another way and is not necessary to use CSS animations, simply CSS transitions (in addition, is not necessary anymore to use vendor-prefixes to declare transitions or animations).
Please, look at this working example:
HTML (I inserted a fake content to create an element with a relative big height)
<div class="cmp-accordion__panel--expanded">
b<br>b<br>b<br>b<br>b<br>b<br>b<br>b<br>b<br>b<br>b<br>b<br>b<br>b<br>b<br>b<br>b<br>b<br>b<br>b
</div>
LESS
[class*="cmp-accordion__panel"] {
border:solid 1px red;
overflow:hidden;
transition:opacity 0.3s ease-out, max-height 0.8s ease-out;
}
.cmp-accordion__panel {
&--hidden {
max-height:0;
opacity:0;
}
&--expanded {
opacity:1;
max-height:1000px;
}
}
Please note that, thanks to attribute partial value selector I added also some rules that apply to both *--hidden and *--expanded classes (I personally prefer a general class and an addition of a second one in some cases, instead of switching between two, but I did not want to change too much your approach).
The key rule is switching between two values of max-height property, from a 0 value to another "enough big" one. If you effectively know final height of the element you can simply use also height property, but in case of dynamic content, max-height did the trick.
Please note also the presence of overflow:hidden; applied to both classes, to simulate height changes.
Finally, animation effect relies only on a CSS transition applied to opacity and max-height properties, with different timings to enhance effect.
You cannot animate or transition from display: block; to display: none;, so you will need to remove this if you wish to animate it.
To ensure it fades and is removed you should animate the visibilty and opacity attributes.
Alternatively if you are using jQuery you can use the .fadeOut() function.
MDN - CSS Visibility
jQuery - fadeOut()
I have a list of elements, which when hovered over show a set of controls to remove them. The controls transition in with opacity values.
.duplicate-controls {
position: relative;
float: left;
opacity: 0;
transition: opacity linear 0.7s; }
.duplicate-group:hover .duplicate-controls {
opacity: 1;
transition: opacity linear 0.7s; }
When I'm animating the content, it'll skip or interrupt the animation in a jarring fashion. If I remove the opacity transitions, i can't reproduce the issue.
Please see the following gif for a visual representation of what i'm talking about.
This is it interrupting.
http://gfycat.com/IncomparableBlaringAsianporcupine
This is how it should animate.
http://gfycat.com/CheapMajesticBluebottlejellyfish
Remove the transition property from
.duplicate-group:hover .duplicate-controls{}
I use a secondary fille called custom.css to overwrite the bootstrap code and I would like to know how to create a code that is activating only when the visitor of my site is not in the very top of the page.
Until now I created a transparent navbar using the default code provided by bootstrap. The only thing I have to do is to set it to execute: background-color: #color when the visitor is scrolling down.
Example: https://www.lyft.com/
When I am in the top of the page, the navbar is transparent, but when I scroll down it becomes opaque.
Ok you need the following code to achieve this effect: (I am going to use jQuery as it is the bootstrap supported language).
jQuery:
/**
* Listen to scroll to change header opacity class
*/
function checkScroll(){
var startY = $('.navbar').height() * 2; //The point where the navbar changes in px
if($(window).scrollTop() > startY){
$('.navbar').addClass("scrolled");
}else{
$('.navbar').removeClass("scrolled");
}
}
if($('.navbar').length > 0){
$(window).on("scroll load resize", function(){
checkScroll();
});
}
You can also use ScrollSpy to do this.
and your CSS (example):
/* Add the below transitions to allow a smooth color change similar to lyft */
.navbar {
-webkit-transition: all 0.6s ease-out;
-moz-transition: all 0.6s ease-out;
-o-transition: all 0.6s ease-out;
-ms-transition: all 0.6s ease-out;
transition: all 0.6s ease-out;
}
.navbar.scrolled {
background: rgb(68, 68, 68); /* IE */
background: rgba(0, 0, 0, 0.78); /* NON-IE */
}
$(document).ready(function() {
$(window).scroll(function() {
if($(this).scrollTop() > height) {
$('.navbar').addClass('scrolled');
} else {
$('.navbar').removeClass('scrolled');
}
});
});
To avoid the performance hit of using the scroll, load and resize events, you can now use the Intersection Observer API.
It will allow you to detect if the content on your page has been scrolled, and set the nav bar transparency accordingly (by adding or removing a class).
Have a look at this answer for more details.
I have the following situation: I have an element .animated-container which is invisible by default. When it gets an additional .is-visible class the element fades in with a slight move from the top. That is fine so far. Now my problem is, that the exit animation should be without the slight move back to the top which currently leads to a jump of my element.
The enter transition looks like this:
.is-visible {
transition: opacity .2s, margin-top .4s;
opacity: 1;
visibility: visible;
margin-top: 0;
}
and the exit transition like this:
.animated-container {
/* ... */
transition: opacity .2s, visibility .2s;
margin-top: -60px;
opacity: 0;
visibility: hidden;
}
Having my code like this makes my element jump since margin-top is not animated when removing the .is-visible class.
See my current code here
Thank you so much for every upcoming answer!
Just add a margin-top transition with a delay that lasts the duration of the other animations..
This way it will wait for the other transitions to finish and then try the margin-top (which you do not care about since it will already be invisible.)
.animated-container{
/*...*/
transition: opacity .2s, visibility .2s, margin-top 0s .2s;
}
Demo at http://codepen.io/gpetrioli/pen/xbbavJ
Is it possible to use CSS3 transition animation on page load without using Javascript?
This is kind of what I want, but on page load:
image-slider.html
What I found so far
CSS3 transition-delay, a way to delay effects on elements. Only works on hover.
CSS3 Keyframe, works on load but are extremly slow. Not useful because of that.
CSS3 transition is fast enough but don't animate on page load.
You can run a CSS animation on page load without using any JavaScript; you just have to use CSS3 Keyframes.
Let's Look at an Example...
Here's a demonstration of a navigation menu sliding into place using CSS3 only:
#keyframes slideInFromLeft {
0% {
transform: translateX(-100%);
}
100% {
transform: translateX(0);
}
}
header {
/* This section calls the slideInFromLeft animation we defined above */
animation: 1s ease-out 0s 1 slideInFromLeft;
background: #333;
padding: 30px;
}
/* Added for aesthetics */ body {margin: 0;font-family: "Segoe UI", Arial, Helvetica, Sans Serif;} a {text-decoration: none; display: inline-block; margin-right: 10px; color:#fff;}
<header>
Home
About
Products
Contact
</header>
Break it down...
The important parts here are the keyframe animation which we call slideInFromLeft...
#keyframes slideInFromLeft {
0% {
transform: translateX(-100%);
}
100% {
transform: translateX(0);
}
}
...which basically says "at the start, the header will be off the left hand edge of the screen by its full width and at the end will be in place".
The second part is calling that slideInFromLeft animation:
animation: 1s ease-out 0s 1 slideInFromLeft;
Above is the shorthand version but here is the verbose version for clarity:
animation-duration: 1s; /* the duration of the animation */
animation-timing-function: ease-out; /* how the animation will behave */
animation-delay: 0s; /* how long to delay the animation from starting */
animation-iteration-count: 1; /* how many times the animation will play */
animation-name: slideInFromLeft; /* the name of the animation we defined above */
You can do all sorts of interesting things, like sliding in content, or drawing attention to areas.
Here's what W3C has to say.
Very little Javascript is necessary:
window.onload = function() {
document.body.className += " loaded";
}
Now the CSS:
.fadein {
opacity: 0;
-moz-transition: opacity 1.5s;
-webkit-transition: opacity 1.5s;
-o-transition: opacity 1.5s;
transition: opacity 1.5s;
}
body.loaded .fadein {
opacity: 1;
}
I know the question said "without Javascript", but I think it's worth pointing out that there is an easy solution involving one line of Javascript.
It could even be inline Javascript, something like that:
<body onload="document.body.className += ' loaded';" class="fadein">
That's all the JavaScript that's needed.
I think I have found a sort of work around for the OP question - instead of a transition beginning 'on.load' of the page - I found that using an animation for an opacity fade in had the same effect, (I was looking for the same thing as OP).
So I wanted to have the body text fade in from white(same as site background) to black text colour on page load - and I've only been coding since Monday so I was looking for an 'on.load' style thing code, but don't know JS yet - so here is my code that worked well for me.
#main p {
animation: fadein 2s;
}
#keyframes fadein {
from { opacity: 0}
to { opacity: 1}
}
And for whatever reason, this doesn't work for .class only #id's(at least not on mine)
Hope this helps - as I know this site helps me a lot!
CSS only with a delay of 3s
a few points to take here:
multiple animations in one call
we create a wait animation that just delays the actual one (the second one in our case).
Code:
header {
animation: 3s ease-out 0s 1 wait, 0.21s ease-out 3s 1 slideInFromBottom;
}
#keyframes wait {
from { transform: translateY(20px); }
to { transform: translateY(20px); }
}
#keyframes slideInFromBottom {
from { transform: translateY(20px); opacity: 0; }
to { transform: translateY(0); opacity: 1; }
}
Well, this is a tricky one.
The answer is "not really".
CSS isn't a functional layer. It doesn't have any awareness of what happens or when. It's used simply to add a presentational layer to different "flags" (classes, ids, states).
By default, CSS/DOM does not provide any kind of "on load" state for CSS to use. If you wanted/were able to use JavaScript, you'd allocate a class to body or something to activate some CSS.
That being said, you can create a hack for that. I'll give an example here, but it may or may not be applicable to your situation.
We're operating on the assumption that "close" is "good enough":
<html>
<head>
<!-- Reference your CSS here... -->
</head>
<body>
<!-- A whole bunch of HTML here... -->
<div class="onLoad">OMG, I've loaded !</div>
</body>
</html>
Here's an excerpt of our CSS stylesheet:
.onLoad
{
-webkit-animation:bounceIn 2s;
}
We're also on the assumption that modern browsers render progressively, so our last element will render last, and so this CSS will be activated last.
add this to your css for fade in animation
body{animation: 2s ease-out 0s 1 FadeIn;}
#keyframes FadeIn {
0% {
opacity:0;
}
100% {
opacity:1;
}
}
increase the ease-out time if you want it to load slower
Even simplier solution (still with [one line inline] javascript):
Use this as the body tag:
Note that body. or this. did not work for me. Only the long ; querySelector allow the use of classList.remove (Linux Chromium)
<body class="onload" onload="document.querySelector('body').classList.remove('onload')">
and add this line on top of your other css rules.
body.onload *{ transform: none !important; }
Take note that this can apply to opacity (as requested by OP [other posters] ) simply by using opacity as a transition trigger instead. (might even work on any other css ruling in the same fashion and you can use multiple class for explicity delay between triggering)
The logic is the same. Enforce no transform (with :none !importanton all child element of body.onloadand once the document is loaded remove the class to trigger all transition on all elements as specified in your css.
FIRST ANSWER BELOW (SEE EDIT ABOVE FOR SHORTER ANSWER)
Here is a reverse solution:
Make your html layout and set the css accordingly to your final result (with all the transformation you want).
Set the transition property to your liking
add a class (eg: waitload) to the elements you want to transform AFTER load. The CSS keyword !important is the key word here.
Once the document is loaded, use JS to remove the class from the elements to to start transformation (and remove the transition: none override).
Works with multiple transition on multiple elements. Did not try cross-browser compatibility.
div {
width: fit-content;
}
#rotated {
transform: rotate(-50deg)/* any other transformation */
;
transition: 6s;
}
#translated {
transform: translate(90px)/* any other transformation */
;
transition: 6s;
}
.waitload {
transform: none !important;
}
<div id='rotated' class='waitload'>
rotate after load
</div>
<div id='translated' class='waitload'>
trasnlate after load
</div>
<script type="text/javascript">
document.addEventListener('DOMContentLoaded', init);
function init() {
[...document.querySelectorAll('.waitload')]
.map(e => e.classList.remove('waitload'));
}
</script>
Similar to #Rolf's solution, but skip reference to external functions or playing with class. If opacity is to remain fixed to 1 once loaded, simply use inline script to directly change opacity via style. For example
<body class="fadein" onload="this.style.opacity=1">
where CSS sytle "fadein" is defined per #Rolf,defining transition and setting opacity to initial state (i.e. 0)
the only catch is that this does not work with SPAN or DIV elements, since they do not have working onload event
start it with hover of body than It will start when the mouse first moves on the screen, which is mostly within a second after arrival, the problem here is that it will reverse when out of the screen.
html:hover #animateelementid, body:hover #animateelementid {rotate ....}
thats the best thing I can think of: http://jsfiddle.net/faVLX/
fullscreen: http://jsfiddle.net/faVLX/embedded/result/
Edit see comments below:
This will not work on any touchscreen device because there is no hover, so the user won't see the content unless they tap it. – Rich Bradshaw
Ok I have managed to achieve an animation when the page loads using only css transitions (sort of!):
I have created 2 css style sheets:
the first is how I want the html styled before the animation...
and the second is how I want the page to look after the animation has been carried out.
I don't fully understand how I have accomplished this but it only works when the two css files (both in the head of my document) are separated by some javascript as follows.
I have tested this with Firefox, safari and opera. Sometimes the animation works, sometimes it skips straight to the second css file and sometimes the page appears to be loading but nothing is displayed (perhaps it is just me?)
<link media="screen,projection" type="text/css" href="first-css-file.css" rel="stylesheet" />
<script language="javascript" type="text/javascript" src="../js/jQuery JavaScript Library v1.3.2.js"></script>
<script type='text/javascript'>
$(document).ready(function(){
// iOS Hover Event Class Fix
if((navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i)) ||
(navigator.userAgent.match(/iPad/i))) {
$(".container .menu-text").click(function(){ // Update class to point at the head of the list
});
}
});
</script>
<link media="screen,projection" type="text/css" href="second-css-file.css" rel="stylesheet" />
Here is a link to my work-in-progress website: http://www.hankins-design.co.uk/beta2/test/index.html
Maybe I'm wrong but I thought browsers that do not support css transitions should not have any issues as they should skip straight to the second css file without delay or duration.
I am interested to know views on how search engine friendly this method is. With my black hat on I suppose I could fill a page with keywords and apply a 9999s delay on its opacity.
I would be interested to know how search engines deal with the transition-delay attribute and whether, using the method above, they would even see the links and information on the page.
More importantly I would really like to know why this is not consistent each time the page loads and how I can rectify this!
I hope this can generate some views and opinions if nothing else!
If anyone else had problems doing two transitions at once, here's what I did. I needed text to come from top to bottom on page load.
HTML
<body class="existing-class-name" onload="document.body.classList.add('loaded')">
HTML
<div class="image-wrapper">
<img src="db-image.jpg" alt="db-image-name">
<span class="text-over-image">DB text</span>
</div>
CSS
.text-over-image {
position: absolute;
background-color: rgba(110, 186, 115, 0.8);
color: #eee;
left: 0;
width: 100%;
padding: 10px;
opacity: 0;
bottom: 100%;
-webkit-transition: opacity 2s, bottom 2s;
-moz-transition: opacity 2s, bottom 2s;
-o-transition: opacity 2s, bottom 2s;
transition: opacity 2s, bottom 2s;
}
body.loaded .text-over-image {
bottom: 0;
opacity: 1;
}
Don't know why I kept trying to use 2 transition declarations in 1 selector and (not really) thinking it would use both.
You could use custom css classes (className) instead of the css tag too.
No need for an external package.
import React, { useState, useEffect } from 'react';
import { css } from '#emotion/css'
const Hello = (props) => {
const [loaded, setLoaded] = useState(false);
useEffect(() => {
// For load
setTimeout(function () {
setLoaded(true);
}, 50); // Browser needs some time to change to unload state/style
// For unload
return () => {
setLoaded(false);
};
}, [props.someTrigger]); // Set your trigger
return (
<div
css={[
css`
opacity: 0;
transition: opacity 0s;
`,
loaded &&
css`
transition: opacity 2s;
opacity: 1;
`,
]}
>
hello
</div>
);
};
Not really, as CSS is applied as soon as possible, but the elements might not be drawn yet. You could guess a delay of 1 or 2 seconds, but this won't look right for most people, depending on the speed of their internet.
In addition, if you want to fade something in for instance, it would require CSS that hides the content to be delivered. If the user doesn't have CSS3 transitions then they would never see it.
I'd recommend using jQuery (for ease of use + you may wish to add animation for other UAs) and some JS like this:
$(document).ready(function() {
$('#id_to_fade_in')
.css({"opacity":0}) // Set to 0 as soon as possible – may result in flicker, but it's not hidden for users with no JS (Googlebot for instance!)
.delay(200) // Wait for a bit so the user notices it fade in
.css({"opacity":1}); // Fade it back in. Swap css for animate in legacy browsers if required.
});
Along with the transitions added in the CSS. This has the advantage of easily allowing the use of animate instead of the second CSS in legacy browsers if required.