<h1 align="center">Loaders.css</h1>

<p align="center">
  <img src="https://img.shields.io/npm/v/loaders.css.svg?style=flat-square">
  <img src="https://img.shields.io/bower/v/loaders.css.svg?style=flat-square">
</p>

Delightful and performance-focused pure css loading animations.

### What is this?

[See the demo](http://connoratherton.com/loaders)

A collection of loading animations written entirely in css.
Each animation is limited to a small subset of css properties in order
to avoid expensive painting and layout calculations.

I've posted links below to some fantastic articles that go into this
in a lot more detail.

### Install

```
bower install loaders.css
```

```
npm i --save loaders.css
```

### Usage

##### Standard
- Include `loaders.min.css`
- Create an element and add the animation class (e.g. `<div class="loader-inner ball-pulse"></div>`)
- Insert the appropriate number of `<div>`s into that element

##### jQuery (optional)
- Include `loaders.min.css`, jQuery, and `loaders.css.js`
- Create an element and add the animation class (e.g. `<div class="loader-inner ball-pulse"></div>`)
- `loaders.js` is a simple helper to inject the correct number of div elements for each animation
- To initialise loaders that are added after page load select the div and call `loaders` on them (e.g. `$('.loader-inner').loaders()`)
- Enjoy

### Customising

##### Changing the background color

Add styles to the correct child `div` elements

``` css
.ball-grid-pulse > div {
  background-color: orange;
}
```

##### Changing the loader size

Use a [2D Scale](https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function/scale) `transform`

```css
.loader-small .loader-inner {
  transform: scale(0.5, 0.5);
}
```

### Browser support

Check the [can I use](http://caniuse.com/#search=css-animation) [tables](http://caniuse.com/#search=css-transform).
All recent versions of the major browsers are supported and it has support back to IE9.

Note: The loaders aren't run through autoprefixer, see this [issue](https://github.com/ConnorAtherton/loaders.css/issues/18).

IE 11  | Firefox 36 | Chrome 41 | Safari 8
------ | ---------- | --------- | --------
✔ | ✔ | ✔ | ✔

### Contributing

Pull requests are welcome! Create another file in `src/animations`
and load it in `src/loader.scss`.

In a separate tab run `gulp --require coffee-script/register`. Open `demo/demo.html`
in a browser to see your animation running.

### Further research

- http://www.paulirish.com/2012/why-moving-elements-with-translate-is-better-than-posabs-topleft/
- http://aerotwist.com/blog/pixels-are-expensive/
- http://www.html5rocks.com/en/tutorials/speed/high-performance-animations/
- http://frontendbabel.info/articles/webpage-rendering-101/

### Inspired by loaders.css

A few other folks have taken loaders and ported them elsewhere.

- **React** - [Jon Jaques](https://github.com/jonjaques) built a React demo you can check out [here](https://github.com/jonjaques/react-loaders)
- **Vue** - [Kirill Khoroshilov](https://github.com/Hokid) loaders wrapped into components [vue-loaders](https://github.com/Hokid/vue-loaders)
- **Angular** - [the-corman](https://github.com/the-cormoran/angular-loaders) created some directives for angular, as did [Masadow](https://github.com/Masadow) in [this pr](https://github.com/ConnorAtherton/loaders.css/pull/50)
- **Ember** - [Stanislav Romanov](https://github.com/kaermorchen) created an Ember addon [ember-cli-loaders](https://github.com/kaermorchen/ember-cli-loaders) for using Loaders.css in Ember applications
- **iOS** - [ninjaprox](https://github.com/ninjaprox/NVActivityIndicatorView) and [ontovnik](https://github.com/gontovnik/DGActivityIndicatorView)
- **Android** - [Jack Wang](https://github.com/81813780/AVLoadingIndicatorView) created a library and [technofreaky](https://github.com/technofreaky/Loaders.CSS-Android-App) created an app

### Licence

The MIT License (MIT)

Copyright (c) 2016 Connor Atherton

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.