I have built a website that has lots of animations, using CSS3. The elements that are animated all have the position attribute set to absolute, and the container's position set to relative. Each element initially has a top and left value (set via the style attribute), but when the page loads, all the elements are initially animated to the position defined from top:0px;left:0px. Is there a way for the page to start off with the elements at there desired positions without them initially being animated?
Your CSS animations are ready before your javascript. I usually add a class to the body so I know it's ready for animations...
window.onload = function(){
document.body.className += " animated";
}
and then in your CSS
.box {
/* usual styles here*/
}
.animated .box {
-prefix-animation: animationName duration ease;
}
Related
I'm creating a dashboard page which is full of CSS animations. From Bootstrap stuff (animated progress bars) to custom animations.
When you click some of the elements, a near full-screen modal is triggered, which overlaps all the animations, so I want to temporarily pause them all (because of possible performance issues) by adding/removing a class to one of the top elements, and using CSS to pause all animations when that class is set.
This solution would use only a single line of js, just to toggle the class on opening the modal.
My template looks somewhat like this:
<body>
<div class="modal">
<!-- Modal code -->
</div>
<div class="app">
<!-- Template -->
</div>
</div>
Is it possible to add a class to .app which pauses every CSS animation in every child element?
Note 1:
I know you can use the exact opposite of what I request: namely, have a default .animation-play class to one of the top elements, and prefix every child element with an animation with this class, and then remove this class to pause every animation. Just like:
app.animation-play .somediv .somediv .element {
// animation code
}
app.animation-play .somediv .element {
// animation code
}
app.animation-play .somediv .somediv .somediv .somediv .element {
// animation code
}
But then I have to edit a lot of CSS code, and it doesn't look very nice either.
Note 2:
I'm also open for a JS solution, but I would heavily prefer a pure CSS way of achieving this.
You can use a universal selector to target everything when a class of 'paused' is added to your app wrapper, however many CSS linters still warn against using these due to performance impacts.
To be honest the impact is probably minimal these days and many CSS resets for example use them.
You could use something like:
.app.paused * {
animation: none;
}
EDIT:
Looking through the comments above it seems as though the above selector doesn't have enough precedence to overwrite the animations so '!important' has been added.
.app.paused * {
animation: none !important;
transition: none !important;
}
However this is generally not a great idea, I always try to avoid using '!important' at all costs due to the difficulty in maintaining the stylesheet with these selectors in place. If you can overwrite the animations with a greater precedence then it would be better to do so rather than using '!important'.
EDIT 2:
As you mentioned you were open to JS solutions, here is some JS that should clear all the animations within a given selector. I'm not sure what the performance impact of doing it this way is but I added it here just in case someone else prefers to do it only using JS:
let stopAnimationsWrap = document.querySelector('.app');
let stoppedAnims = [];
// Stop animations
document.querySelector('.stop').addEventListener('click', () => {
let appAllEls = stopAnimationsWrap.querySelectorAll('*');
let allElsAr = Array.prototype.slice.call(appAllEls);
allElsAr.forEach((thisEl) => {
let elClass = thisEl.classList[0];
let cs = getComputedStyle(thisEl, null);
let thisAnimation = cs.getPropertyValue('animation-name');
if (thisAnimation !== 'none') {
stoppedAnims.push([elClass, {
'animationName': thisAnimation
}]);
thisEl.style.animationName = 'none';
}
});
});
// Start animations
document.querySelector('.start').addEventListener('click', () => {
stoppedAnims.forEach((thisEl) => {
let domEl = '.' + thisEl[0];
stopAnimationsWrap.querySelector(domEl).style.animationName = thisEl[1].animationName;
});
});
Fiddle:
https://jsfiddle.net/vu6javb2/14/
.app {
-webkit-animation-play-state: paused; /* Safari 4.0 - 8.0 */
animation-play-state: paused;
}
on hover:
.app:hover {
-webkit-animation-play-state: paused; /* Safari 4.0 - 8.0 */
animation-play-state: paused;
}
on my website there are some hexagon SVG´s with different colors and a normal .content class with some style.
What i want, is if the user :hover over the SVG the background-color of .content should get a "specific" color.
#hexagon4_work:hover .content{
background-color: #6EC5D3;
}
#hexagon4_work:hover ~ .content{
background-color: #6EC5D3;
}
#hexagon4_work:hover > .content{
background-color: #6EC5D3;
}
#hexagon4_work:hover + .content{
background-color: #6EC5D3;
}
I have already searched about it, but i do not found any solution for this.
What i found was these operators. But these affect only for a child in a parent. / or not?
I´d like to only use CSS, so if it is not possible only in CSS, please tell me that too. (I am a noobie in JS so dont wonder.) :)
Thanks for all following answers.
- MK
There is no CSS-only solution for your Problem. Check the comment from David.
But you could do something with JavaScript.
Add this to your code.
var hex4 = document.getElementById('hexagon4_work');
hex4.addEventListener('mouseover', function(){
document.getElementsByClassName('content')[0]
.style.backgroundColor = '#6EC5D3';
});
hex4.addEventListener('mouseout', function(){
document.getElementsByClassName('content')[0]
.style.backgroundColor = 'transparent';
});
I tried it on your page and it works. For the other hexagons you should copy this code and modify the selecor in first line and the color in line 4.
My recomendation:
Add the CSS transition: background-color 500ms; to the content div. It would be a nice animation.
While there's no way to do this directly (there are no parent selectors in CSS as of 2017), you can do it by creating a child SPAN, setting z-index and its position to push it behind everything else in the parent, and change its background color (parent background = transparent). Check this out
How do I achieve something like this:
*:hover{
background-color:lightblue;
}
I am trying to change background color of any element on the page when hovering on the element. Not sure why it doesnt work.
It works fine http://jsfiddle.net/mendesjuan/9pta8vbz/
The problem is that it's highlighting the entire body since the mouse is over the body, so you don't see highlighting on children any differently.
The following example should clarify it http://jsfiddle.net/mendesjuan/9pta8vbz/1/ It will highlight items inside the body
CSS
body *:hover{
background-color:lightblue;
}
HTML
<p>1 <span>inside</span></p><p>2</p><p>3</p>
It will highlight the paragraphs, but the span will behave the same way since the paragraph will also be highlighted
What you are doing cannot be done with CSS alone, you can use JS to add a CSS class to the element that the mouse is over http://jsfiddle.net/mendesjuan/9pta8vbz/2/
CSS
.highlight {
background-color:lightblue;
}
JavaScript
// This is a simplified version that doesn't take care of edge cases
// known bugs: should use addEventListener, should not wipe out existing `className`,
// e.target is not 100% cross browser, but those are other topics
document.onmouseover = function(e) {
e.target.className = 'highlight';
}
document.onmouseout = function(e) {
e.target.className = '';
}
My CSS has to change using a transition ,and till now i used div:hover for that.
The transition needs to be activated when you click another div, not when you hover over the div that has to move/change .
How can I do that ?
Thanks
Evert
You cannot handle click events on dom elements with css, you will need to use javascript for this.
You can add a click event to the first div which is fired when you click it. Within the event you select the other div, and make the transition.
Working Demo
You can do this by adding a class with the css transition:
Html:
<div id="clickme">1</div>
<div id="changeMe">2</div>
Javascript:
var el = document.getElementById('clickme');
el.onclick = function() {
document.getElementById('changeMe').className = "transition";
};
CSS:
.transition{
/* transition css */
}
I was wondering how I could set up css pseudo classes, specifically hover so when I hover over an element, like a div with an id, the properties of a different div with an id get changed?
so normally it would be this:
#3dstack:hover {
listed properties
}
I'm not sure what the change would be to have it hover on div with the id 3dstack and have it change another div.
I do not think that is possible unless the element you want to change the properties of is a descendent or a sibling of the hovered element, in which case you can do:
#myElement:hover #myElementDescendent {
background-color: blue;
}
/*or*/
#myElement:hover + #myElementSibling {
background-color: blue;
}
Of course you can always use jquery to do this:
$("#anelement").hover(
function() {
$("otherelement").css("background-color", "blue");
});
See the differences here
This is not possible with CSS alone. You'll have to use a JavaScript event handler. For example, with jQuery's hover:
$('#3dstack').hover(function() {
$('#otherID').toggleClass('properties');
});
DEMO
Visually you can do this using LESS, but under the hood it's actually using JavaScript.