new 10 minutes intro about restyle.js in vimeo
This project has been somehow inspired by absurd.js but it is not exactly the same.
You can check restyle specifications or go directly to a face 2 face against absurd but the long story short is that no JavaScript library out there fits in about 1KB and feels as natural as restyle
does in typing CSS.
Good news is, you can choose more now but let's see what's in the menu here ;-)
restyle
is a function able to transform the following:
// we are in a browser
// defining some style at runtime
var myStyle = (function(){
// some function helper
function getSomeNumber(boundary) {
return Math.floor(Math.random() * (boundary + 1));
}
// something we could reuse all over
function hex(red, green, blue) {
return '#'.concat(
('0' + red.toString(16)).slice(-2),
('0' + green.toString(16)).slice(-2),
('0' + blue.toString(16)).slice(-2)
);
}
// the fresh new appended style object wrap
return restyle({
body: {
backgroundColor: hex(100, 60, 25),
padding: {
top: 50,
left: '30%'
}
},
'.component > li': {
width: window.innerWidth,
height: getSomeNumber(200)
},
'.component > .icon-spinner': {
animation: {
name: 'spin',
duration: '4s'
}
},
'@keyframes spin': {
from: {
transform: 'rotate(0deg)'
},
to: {
transform: 'rotate(360deg)'
}
}
});
}());
into this runtime appended and generated cross browser CSS style:
body {
background-color: #643c19;
padding-top: 50px;
padding-left: 30%;
}
.component > li {
width: 1251px;
height: 182px;
}
.component > .icon-spinner {
-webkit-animation-name: spin;
-moz-animation-name: spin;
-ms-animation-name: spin;
-o-animation-name: spin;
animation-name: spin;
-webkit-animation-duration: 4s;
-moz-animation-duration: 4s;
-ms-animation-duration: 4s;
-o-animation-duration: 4s;
animation-duration: 4s;
}
@-webkit-keyframes spin {
from {
-webkit-transform: rotate(0deg);
transform: rotate(0deg);
}
to {
-webkit-transform: rotate(360deg);
transform: rotate(360deg);
}
}
@-moz-keyframes spin {
from {
-moz-transform: rotate(0deg);
transform: rotate(0deg);
}
to {
-moz-transform: rotate(360deg);
transform: rotate(360deg);
}
}
@-ms-keyframes spin {
from {
-ms-transform: rotate(0deg);
transform: rotate(0deg);
}
to {
-ms-transform: rotate(360deg);
transform: rotate(360deg);
}
}
@-o-keyframes spin {
from {
-o-transform: rotate(0deg);
transform: rotate(0deg);
}
to {
-o-transform: rotate(360deg);
transform: rotate(360deg);
}
}
@keyframes spin {
from {
-webkit-transform: rotate(0deg);
-moz-transform: rotate(0deg);
-ms-transform: rotate(0deg);
-o-transform: rotate(0deg);
transform: rotate(0deg);
}
to {
-webkit-transform: rotate(360deg);
-moz-transform: rotate(360deg);
-ms-transform: rotate(360deg);
-o-transform: rotate(360deg);
transform: rotate(360deg);
}
}
with the ability to drop all those styles at once:
myStyle.remove();
It is now possible to simplify transitions through the transition
public static method method.
var transition = restyle.transition(
genericElement,
from: {
opacity: '0',
height: 34
},
to: {
opacity: '1' // will keep height 34
},
function onTransitionEnd(e) {
console.log('transition completed');
e.detail.clean(); // remove related styles
}
);
It is also possible to create multiple transitions from a starting point.
var transition = restyle.transition(
genericElement,
from: {
opacity: '0',
height: 0
},
to: [{
height: 200 // will keep opacity '0'
}, {
opacity: '1' // will keep height 200
}],
function onTransitionEnd(e) {
console.log('transition completed');
e.detail.clean(); // remove related styles
}
);
In latter case the final callback happens when last transition is completed.
At any time it is possible to ignore the callback via transition.drop()
or to clean all styles and transitions via transition.clean()
.
Please note that unless explicitly done, related styles will not be dropped.
If you need to keep the transition end CSS please add a class and after that clean everything else.
It is now possible to simplify animations through the animate
method.
// a generic animation style
var glowAnimation = restyle({
'@keyframes glow-animation': {
'0%': { boxShadow: '0px 0px 0px 0px rgba(255,255,255,1)' },
'100%': { boxShadow: '0px 0px 32px 16px rgba(255,255,255,1)' }
},
'.glow': {
animation: {
name: 'glow-animation',
duration: '1s',
direction: 'normal'
}
}
});
// glowing function
function glow(el, callback) {
el.classList.add('glow');
return glowAnimation.animate(el, 'glow-animation', callback);
}
// whenever is needed
document.querySelector('#link')
.addEventListener('click', function (e) {
// glow
glow(e.currentTarget, function (event) {
console.log(event);
});
});
The fallback is based on setTimeout
and the returned object has a .drop()
method able to cancel the animation end event.
The duration is retrieved automatically when the fallback is used.
Please note the fallback is compatible with s
or ms
as seconds or milliseconds and nothing else.
It is possible to retrieve an animation duration through the .getAnimationDuration(domElement, animationName)
method which returns -1
in case of failure.
The signature has been improved to accept a first argument representing a generic container/component prefix.
var compStyle = restyle('my-component-name', {
'div.large': {
width: '100%'
},
span: {
display: 'none'
}
});
Above code will produce a CSS similar to the following one:
my-component-name div.large {
width: 100%;
}
my-component-name span {
display: none;
}
This can be very handy when you have to style Custom Elements or generic reusable web components.
restyle(
[component, ] // an optional string used to auto prefix all styles under a node/component
Object // a JSONish object as spec'd
[, prefixes] // optional prefixes
// as node.js module this is by default an empty array
// generating prefixes-less CSS for other pre/post processors
// in browsers this is by default all vendors prefixes
// without bothering much that -webkit-background does not even exist
// browsers will simply ignore CSS that is meaningless
[, document] // browsers only, eventually a different document from another realm
):Object;
The first Object
parameter in restyle
signature is spec'd as such:
selector any CSS selector
{
body: {
// ...
},
'ul.dat > li:first-child': {
// ...
}
}
property a property name or a group name
{
div: {
// properties
width: 256, // will result in "256px"
transform: 'rotate(360deg)',
background: 'transparent url(image.png) 0 0'
}
}
camelCase will be translated into camel-case
(backgroundImage => background-image)
value the property value or a group of properties
if int, will be set as 'px' value
group key/value properties names/values object
or
an Array of possible values for the property
{
div: {
// group
background: {
color: 'transparent',
image: 'url(image.png)',
position: '0 0'
}
}
}
or
{
'.flexbox': {
// mutiple values
display: [
'-webkit-box',
'-moz-box',
'-ms-flexbox',
'-webkit-flex',
'flex'
]
}
}
special keyframes, media queries,
anything that starts with @
{
div: {
// as before
},
// special selectors
'@keyframes spin': {
// cpecialContent
}
}
specialContent everything supported by restyle as CSS
{
// special selectors
'@keyframes spin': {
// properties => values or groups
'0%': {transform: 'rotate(0deg)'},
'100%': {transform: 'rotate(360deg)'}
},
'@media all and (color)': {
'body': {
background: randomRainbow()
}
}
}
Here a list of bullets to support restyle
idea, grouped by usage.
restyle
is compatible with new browsers but also old as IE6 . If in doubt, check the live test
restyle
too as the Travis passing build on top says ;-)It is possible to test them directly in this page but here few examples.
// this example code
restyle({
'html, body': {
margin: 0,
padding: 0,
width: '100%',
height: '100%',
overflow: 'hidden',
textAlign: 'center',
fontFamily: 'sans-serif'
},
section: {
margin: 'auto',
marginTop: 20
}
}, []);
It will generate a style with the following content.
html, body {
margin: 0px;
padding: 0px;
width: 100%;
height: 100%;
overflow: hidden;
text-align: center;
font-family: sans-serif;
}
section {
margin: auto;
margin-top: 20px;
}
Things become more interesting with more complex CSS and prefixed support:
restyle({
'div > button:first-child': {
transform: 'rotate(30deg)'
}
}, ['moz', 'webkit']);
will result in
div > button:first-child {
-webkit-transform: rotate(30deg);
-moz-transform: rotate(30deg);
transform: rotate(30deg);
}
while this little piece of code:
restyle({
'body > div': {
animation: {
name: 'spin',
duration: '4s'
}
},
'@keyframes spin': {
from: {
transform: 'rotate(0deg)'
},
to: {
transform: 'rotate(360deg)'
}
}
});
will produce the following
body > div{
-webkit-animation-name:spin;
-moz-animation-name:spin;
-ms-animation-name:spin;
-o-animation-name:spin;
animation-name:spin;
-webkit-animation-duration:4s;
-moz-animation-duration:4s;
-ms-animation-duration:4s;
-o-animation-duration:4s;
animation-duration:4s;
}
@-webkit-keyframes spin{
from{
-webkit-transform:rotate(0deg);
transform:rotate(0deg);
}
to{
-webkit-transform:rotate(360deg);
transform:rotate(360deg);
}
}
@-moz-keyframes spin{
from{
-moz-transform:rotate(0deg);
transform:rotate(0deg);
}
to{
-moz-transform:rotate(360deg);
transform:rotate(360deg);
}
}
@-ms-keyframes spin{
from{
-ms-transform:rotate(0deg);
transform:rotate(0deg);
}
to{
-ms-transform:rotate(360deg);
transform:rotate(360deg);
}
}
@-o-keyframes spin{
from{
-o-transform:rotate(0deg);
transform:rotate(0deg);
}
to{
-o-transform:rotate(360deg);
transform:rotate(360deg);
}
}
@keyframes spin{
from{
-webkit-transform:rotate(0deg);
-moz-transform:rotate(0deg);
-ms-transform:rotate(0deg);
-o-transform:rotate(0deg);
transform:rotate(0deg);
}
to{
-webkit-transform:rotate(360deg);
-moz-transform:rotate(360deg);
-ms-transform:rotate(360deg);
-o-transform:rotate(360deg);
transform:rotate(360deg);
}
}
There are few tricks hidden in the simple restyle
logic where Array
values are able to combine multiple declarations at once.
The most classic example here would be flex-box
mess, simplified through a variable
var flexBox = [
'-webkit-box',
'-moz-box',
'-ms-flexbox',
'-webkit-flex',
'flex'
];
reusable whenever it's needed:
restyle({
'div.container': {
display: flexBox
}
});
resulting into the following CSS
div.container {
display: -webkit-box;
display: -moz-box;
display: -ms-flexbox;
display: -webkit-flex;
display: flex;
}
Another example would be mixins or reusable functions in order to define some grouped style and reuse this whenever is needed.
function flexbox() {
return {
display: [
'-webkit-box',
'-moz-box',
'-ms-flexbox',
'-webkit-flex',
'flex'
]
};
}
function flex(values) {
return {
boxFlex: values,
flex: values
};
}
function order(value) {
return {
boxOrdinalGroup: value,
flexOrder: value,
order: value
};
}
restyle({
'.wrapper': flexbox(),
'.item': [
flex('1 200px'),
order(2)
]
});
Above is a restyle
example of ths Sass one showed in CSS tricks.
Just to be clear what restyle
is not a CSS validator, beautifier, or uglifier, plus it is not responsible or capable of making everything magically works.
As example, flex-box
is not fixed, neither early or non standard implementation of any feature.
However, you can simply combine a common class fix for flex-box and use restyle
to add more or simply specify other properties, there are no implicit limits in what you can write through restyle
.
You are free to fix things indeed by your own, deciding very specific CSS accordingly with the browser if done at runtime or simply trusting other pre-processors if done on the server side with the benefit that the object will be reused in both worlds, as example:
var flexValue = '1 200px',
orderValue = 2,
flexBox = [
'-webkit-box',
'-moz-box',
'-ms-flexbox',
'-webkit-flex',
'flex'
];
var flex = restyle({
'.wrapper': {
display: flexBox
},
'.item': {
boxFlex: flexValue,
flex: flexValue,
boxOrdinalGroup: orderValue,
flexOrder: orderValue,
order: orderValue
}
});
restyle
at runtime? you can do whatever you want. You can combine normal CSS with restyle in order to add special FX only or new features where prefixes are a mess. You can use restyle only to fix things that need to be fixed for browsers that support JS. You can use only restyle
if your app depends on JavaScript so there's no way it's going to be used or useful at all without JS enabled. You chose, don't blame the tool, it's here to help when needed ;-)restyle
works better for WebApp development at runtime and wins in size and performance but it cannot compete against absurd
on the server side since it does nothing that absurd
does, only the object syntax is similar. Bear in mind I've said similar but not identical, absurd.js
is by design not able to solve a property name from a tagName while restyle
simply represents CSS without magic involved.restyle
for serving both server and client at runtime? Yes, again, you can use restyle
as you wish. On the server, you can use same logic you would apply on the client and maybe chose to serve that pre-processed file inside a noscript as external link, using restyle
for all other JS centric cases or for graceful enhancement without compromising the layout. CSS modules can be shared, reused, the same, both pre-processed as CSS behind other pre-processors, or just with all prefixes generated at runtime for more complex scenarios. Go wild, still respect your site/app users ;-)restyle
is, neither what JSSS proposal was. Please take a minute to understand again what is this about, and feel free to use JSSS if you think that's even an option.If you have any hint about some syntax that could improve restyle
ease please let me know, thanks.