CSS Preprocessors: LESS is more or look SASS-y trying
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This document discusses CSS preprocessors, specifically Less and Sass, highlighting their capabilities in extending CSS through features like variables, mixins, and nesting. It outlines the benefits of using preprocessors, such as reduced complexity and increased maintainability, while providing installation instructions and code examples for both Less and Sass. Additionally, it touches on modular structures and responsive design patterns, emphasizing the advantages these tools offer to web developers.
CSS Preprocessors: LESS is more or look SASS-y trying
- 1. CSS preprocessor LESS is more or look SASS-y trying
- 2. Intro • Web Developer • Mobile Developer • .net magazine • @jrcryer
- 3. Definition CSS preprocessors extend CSS, allowing designers and developers create dynamic, module and re-usable CSS
- 4. So...
- 5. Benefits • Reduces complexity • Increase maintainability • Frameworks • Optimized CSS output • Simplifies RWD implementation
- 6. Key Features • Variables • Mixins • Nesting • Operations • Modular
- 7. LESS • Inspired by original SASS • Firstly written in Ruby, converted to JavaScript • Client side (via less.js) • Server side with NodeJs <link rel="stylesheet/less" type="text/css" href="styles.less" /> <script src="less.js" type="text/javascript"></script> npm install -g less lessc styles.less
- 8. SASS / SCSS • Implemented in Ruby • Two Syntaxes • SASS - Indent based, similar to HAML • SCSS - CSS block • Installation gem install sass sass --watch style.scss:style.css
- 9. Variables /* style.scss */ $color: #4D926F; #header { color: $color; } h2 { color: $color; } /* style.less */ @color: #4D926F; #header { color: @color; } h2 { color: @color; }
- 10. MIXINS /** style.scss **/ @mixin rounded-corners ($radius: 5px) { -webkit-border-radius: $radius; -moz-border-radius: $radius; -ms-border-radius: $radius; -o-border-radius: $radius; border-radius: $radius; } #header { @include rounded-corners; } #footer { @include rounded-corners(10px); } /** style.less **/ .rounded-corners (@radius: 5px) { -webkit-border-radius: @radius; -moz-border-radius: @radius; -ms-border-radius: @radius; -o-border-radius: @radius; border-radius: @radius; } #header { .rounded-corners; } #footer { .rounded-corners(10px); }
- 11. Nesting /** style.scss **/ #header { h1 { font-size: 26px; font-weight: bold; } p { font-size: 12px; a { text-decoration: none; &:hover { border-width: 1px } } } } /** style.less **/ #header { h1 { font-size: 26px; font-weight: bold; } p { font-size: 12px; a { text-decoration: none; &:hover { border-width: 1px } } } }
- 12. Operations /** style.scss **/ $the-border: 1px; $base-color: #111; $red: #842210; #header { color: ($base-color * 3); border-left: $the-border; border-right: ($the-border * 2); } #footer { color: ($base-color + #003300); border-color: desaturate($red, 10%); } /** style.less **/ @the-border: 1px; @base-color: #111; @red: #842210; #header { color: (@base-color * 3); border-left: @the-border; border-right: (@the-border * 2); } #footer { color: (@base-color + #003300); border-color: desaturate(@red, 10%); }
- 13. Modules /** _variables.scss **/ @base-color: #111; /** style.scss **/ @import “variables” #header { color: @base-color; } /** variables.less **/ @base-color: #111; /** style.less **/ @import-once ‘variables.less’ #header { color: @base-color; }
- 14. Responsive Pattern modules/ header/ _base.scss _responsive-320px-min.scss _responsive-768px-min.scss _responsive-1024px-min.scss _variables.scss _mixins.scss _responsive.scss app.scss /** app.less **/ @import “variables”; @import-once “mixins”; @import-once “modules/header/base”; @import-once “responsive”; /** _responsive.less **/ @media (min-width:320px) { @import-once “modules/header/responsive- 320px-min”; } modules/ header/ _base.less _responsive-320px-min.less _responsive-768px-min.less _responsive-1024px-min.less _variables.less _mixins.less _responsive.less app.less /** app.less **/ @import-once “_variables.less”; @import-once “_mixins.less”; @import-once “modules/header/_base.less”; @import-once “_responsive.less”; /** _responsive.less **/ @media (min-width:320px) { @import-once “modules/header/_responsive-320px- min.less”; }
- 15. CSS Frameworks
- 16. Other tools
- 17. Features Not Covered... • GUARDED MIXINS • NAMESPACES & SCOPE • CONTROL DIRECTIVES • DEBUGGING • SOURCE MAPS
- 18. Demo Time!
- 19. Fin!