I'm trying to create a count-up animation using CSS3 that starts at a certain number "X" and counts up at a set interval by +1 using an animation sort of like this.
I know its possible to use the animation-duration line as the animation length, and just set the animation-iteration-count to infinite, but is it possible to make it load as "X+1" on each restart of the animation?
Thanks!
A thorough solution with many CSS-only options for counters is this!
It could maybe be done with a pseudo-element where you animate the content attribute, but support of CSS animations on pseudo-elements is still somewhat sketchy.
A JS-free solution would be to put the couting numbers actually in the HTML and then animate between those with
-webkit-animation-timing-function: steps(X);
Example here: JSFiddle
Depending on your feelings towards extra markup I would probably go with a JS solution (there's plenty out there).
Related
guys
I have a problem: i need css style —— animation: spin 1s infinite linear; to works in ie8 and ie9.
The style is for ajax loading animation, you know, it's spinning all the way until ajax request finished.
I searched, but i haven't get the solution.
Do you have any idea?
Thanks in advance.
These browsers do not support this CSS3 features. The safest way around this problem is to find a polyfill or use jQuery. But to support rotations in IE8, you would have to use the Matrix Filter, which is not fun.
My recommendation is to use an animated gif for this loading animation. It is simple and effective. Else you could take a look at http://www.useragentman.com/IETransformsTranslator/
He explains ways of using the Matrix Filter
I found CSS will-changeW3.org docs, MDN docs property (which already works in Chrome and is partiali supported by Firefox and Opera) but I'm not really sure how it works.
Does anybody know something more about this mysterious thing?
I have just read that it allows browser to prepare for calculation over the element in the future.
I don't want to misunderstand it. So I have a few questions.
Should I add this property to the element class or its hover state?
.my-class{
will-change: 'opacity, transform'
}
.my-class:hover{
opacity: 0.5
}
.my-class:active{
transform: rotate(5deg);
}
OR
.my-class{
...
}
.my-class:hover{
will-change: 'opacity'
opacity: 0.5
}
.my-class:active{
will-change: 'transform'
transform: rotate(5deg);
}
How can it increase a browser performance? Theoretically, when CSS is loaded, the browser already "knows" what will happen with each element, doesn't it?
If you can add any good example illustrating how to use it efficiently, I will be grateful :)
I won't copy paste the entire article here but here's a tl;dr version:
Specifying what exactly you want to change allows the browser to make better decisions about the optimizations that it needs to make for these particular changes. This is obviously a better way to achieve a speed boost without resorting to hacks and forcing the browser into layer creations that may or may not be necessary or useful.
How to use it:
will-change: transform, opacity;
How not to use it:
will-change: all;
.potato:hover {
will-change: opacity;
opacity:1;
}
Specifying will-change on hover has no effect:
Setting will-change on an element immediately before it changes has
little to no effect. (It might actually be worse than not setting it
at all. You could incur the cost of a new layer when what you’re
animating wouldn’t have previously qualified for a new layer!)
I spent some time on searching how will-change property works and how we use it. I hope, it will be useful summary. Thanks everybody for answers.
1. Layers Hack / Null Transform Hack
In 'ancient times' (like 2 years ago) somebody discovered that you can draw your CSS animation faster.
How does it work?
If you add transform: translateZ(0) to a css selector, it will force a browser to move the element with this selector to the new compositor layer. What is more, it will increase performance (in most situations, use powers of GPU instead CPU) read more here.
2. Bye Bye hacks, welcome "will-change:"
Probably, it's too early to say bye bye to Layer Hack, but this time will come shortly.
The new property will change appeared in specs of CSS and will be a great successor of layer hack.
3. Browser support
For now, it's available in Chrome and Opera and partially supported by Firefox as well.
4. How to use it properly
Don’t use will-change anywhere in your CSS until after you will
complete implementing your animations. Only then should you go back to
your CSS and apply will-change. More
This is probably the most valuable advice that you can get.
There is no point to use it straight before an action begins by e.g. adding it to the :hover state of a selector. Because browser will not have required time to prepare optimization before change occurrence. Browser will need approx. 200ms to apply optimization, so for example it is better to add will-change to a element when a parent element is on hover state. More
Example:
.parent:hover .change{
will-change: opacity;
}
.change:hover{
opacity: .5;
}
You need to use it really sparingly. If you want to optimize everything, the results will be opposite than expected ones. will-change forces browser to keep optimization turned on and reserve resources like memory for changes in the future which may never happen. It is recommended to turn off will-change afterwards, when it is not necessary anymore e.g. when the animation is finished.
You can do it easily using JavaScript document.getElementById('my_element_id').style.willChange = off;
Now with the help of CSS you can do various of animations, and sometimes this animation becomes a bottleneck for a CPU. So instead of doing this job on a CPU, it would be nice to use GPU for this task. And not so long ago people started to use a trick to do this for a 2D transformation by doing something like:
.accelerate {
-webkit-transform: translate3d(0, 0, 0);
}
This made a browser think that it is doing a 3D transformation, and because all 3D transformations are using GPU, this will offload CPU. This looks hacky (because in fact it is) and will-change property is going to change this by informing the browser to look out for changes in the future, and optimize and allocate memory accordingly.
Based on W3C draft,
The will-change CSS property … allows an author to inform the UA ahead
of time of what kinds of changes they are likely to make to an
element. This allows the UA to optimize how they handle the element
ahead of time, performing potentially-expensive work preparing for an
animation before the animation actually begins.
Good idea to use will-change is to let the browser know in advance what changes on an element can be expected. This allows the browser to make the proper optimizations in advance, which leads to quicker rendering.
This information was taken from this excellent explanation about will-change property. The article has additional example when it is nice to use it and when it is useless or even detrimental
As far as I know...
It is an alternative for translate-z:0.
I dont know about hover, but afaik its best to use it on properties that are being changed gradually by JS, changing opacity, position during scrolling etc.
This property shouldnt be overused, especially on phones, tablets, using this on too many
elements can cause performance issues.
It is encouraged to remove/turn-off this property by JS when it is no longer relevant.
So example usage would be applying that at some point of scroll, with scrollTop:400, then gradually animate opacity and at lets say scrollTop:500, disable will-change again.
Source: shoptalkshow podcast - they mention this article - https://dev.opera.com/articles/css-will-change-property/ - which is probably better source of info than my post :D
Thanks to will-change CSS property we can declare to the browser our intention to change an element’s:
contents,
scroll-position,
various tag properties like transform or opacity,
declare multiple values at once: will-change: transform, opacity, top;
or removing the special optimization, using the value auto.
This allows the browser to schedule the use of GPU/Hardware Acceleration instead of the standard CPU usage.
But we have to use it wisely. We need:
to give this to an element that will change,
assign it early early enough before the change occurs,
remove it from the element that has changed and will not be anymore.
Note from MDN web docs:
will-change is intended to be used as a last resort, in order to try to deal with existing performance problems. It should not be used to anticipate performance problems.
They also mention that if we decide to use the will-change property, we should not set it rigidly in the CSS style sheet, because it probably will cause the browser to keep the optimization in memory for much longer than it is needed... It is better to use this property directly from JavaScript (there is also an example with that).
A good additional resource to explore this topic deeper: Everything You Need to Know About the CSS will-change Property.
I'm using react-window package and there is a "will-change: transform;" property on the outer div. The package dynamically render parts of a large set of data in the visible view according to the scroll position, for example only render 10 items of a 100000 length list. Without the will-change property, the list will be blank when scroll. It shows better on slower cpu.
You can see the example here: react-window-fixed-size-list-vertical. Open the developer tool , uncheck this property in styles, slow down the cpu in Performance tab and scroll the list rapidly.list blank between renders
There is also a discussion.https://github.com/bvaughn/react-window/issues/47
The best solution for me:
transform : translate(calc(-50% + 0.5px), calc(-50% + 0.5px));
But, this solution has trouble with calc in ios safari in a fixed position can cause high battery consumption
This is a very general question, so I have not provided a code.
I was trying out various CSS animations yesterday, however, I was unable to control any of them using the :hover pseudo element in CSS. I basically wan't to slow the animation when a user brings his/her mouse onto the division.
Pure CSS solution will be appreciated. :) thanks in advance.
There is no "comon way" to do this. You will need to find some workarounds.
The most common workaround to slow a CSS animation down on hover is to apply the same animation on the element and it's parent and pause one on hover with the animation-play-state: paused;. (or the other way around with animation-play-state: running;)
EXAMPLE (comes from this answer : Change the Animation speed on hover)
As you can imagin this can't work for all animations and you will need to be creative in each situation to find a solution for this.
I have the following code:
http://jsfiddle.net/RFMxG/1/
When the transition runs, you can see a padding of about 20-30 pixels on the left hand side. Despite the fact I have set the transform-origin to be 0,0,0, it is still not correctly rotating about the y-axis. The left edge of the blue box should be flush against the left hand edge at all times during the animation.
Can anyone tell me what I've done incorrectly?
Okay, there are whole bunch of issues here:
1) CSS transforms aren't animatable using transitions. If you look at the W3C list of transitionable properties, you'll notice that transform isn't there.
2) -webkit-perspective only affects the children of the element it is applied to, not the element itself. Read the Safari blog on this:
The interesting thing about -webkit-perspective is that it does not
affect the element directly. Instead, it affects the appearance of the
3D transforms on the transformed descendants of that element; you can
think of it as adding a transform that gets multiplied into the
descendant transforms. This allows those descendants to all share the
same perspective as they move around.
3) It's awesome that you posted a fiddle, but since this is a CSS problem, for future reference it would have been a lot easier if you cleaned out all the javascript, and used one set of browser prefixes only. Help us help you!
4) What you probably want to use is an animation. Here's a highly modified version of your fiddle that works on hover:
http://jsfiddle.net/RFMxG/4/
5) If javascript is your skill set, and you're at all concerned about browser compatibility (which of course you are!), I highly recommend doing these kinds of animations with jstween.
Right, so the solution was actually due to the fact the transform origin needs to be set prior to the animation starting (it cannot be set at the same time the -webkit-transform property is set).
I've updated the fiddle to demonstrate this now works correctly.
http://jsfiddle.net/RFMxG/5/
As part of a project that needs to support mobile devices, I have been working on mimicking the iPhone toggle control using CSS3. I have the look and feel of the element pretty much there, and am using CSS3 transitions to animate its state change.
When I have the element itself on a page with nothing else, the transition is relatively smooth on iOS. However, when I combine it with other CSS elements on a page, the result in iOS is laggy as anything. It's slightly better than a raw jQuery animation, but not much.
I've set up two test pages to demonstrate what I mean (the difference is hardly noticeable in a regular browser):
Toggle Control on its own > http://ben-major.co.uk/labs/iPhone%20UI/ios_toggle.html
Combined with other elements > http://ben-major.co.uk/labs/iPhone%20UI/
I am looking for any advice on speeding up the transition in mobile devices. What could be the factors that are slowing down its performance on the full page test?
Any advice and comments welcome.
You have to be careful with this, as it can alter the z-index of the element it's applied to, but adding:
-webkit-transform-style: preserve-3d;
To the element you're applying the transition to, can speed animation up considerably, as it forces the hardware to use hardware acceleration for the animation.
If you do encounter layout bugs, you can just switch your 2d transitions to 3d values, so:
-webkit-transform: translate(100px, 100px)
becomes:
-webkit-transform: translate3d(100px, 100px, 0px)
You can see a demo of how this helps speed things up, at http://stickmanventures.com/labs/demo/spinning-gears-Chrome-preserve-3d/#
If after applying this to the element, you see it or elements around it blink upon use, then use:
-webkit-backface-visibility: hidden;
To the element, and that should correct the problem.
These tips have helped me to produce fast, efficient CSS transitions, hope they help. :)
Chrome has recently improved the 2D transition performance, and now this trick is no longer needed. The best thing is that if removed the translate3d you'll no longer have those z-index problems! Use the test to prove. http://stickmanventures.com/labs/demo/spinning-gears-Chrome-preserve-3d/
also you can try will-change: transform; , read more about it here:
https://developer.mozilla.org/en-US/docs/Web/CSS/will-change#Browser_compatibility
I think it quite old already but for anyone who still needs tricks to improve the transition performance on mobile device, you can apply :
-webkit-transform: translateZ(0);
to the element you are animating.
This trick is according to this blog : http://chrissilich.com/blog/fix-css-animation-slow-or-choppy-in-mobile-browsers/.
I have tried and it works quite well.