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CSS on Steroids Dr David Stearns Autumn 2013 and.

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Presentation on theme: "CSS on Steroids Dr David Stearns Autumn 2013 and."— Presentation transcript:

1 CSS on Steroids Dr David Stearns Autumn 2013 and

2 What are SASS and LESS? Extensions to the CSS language to support large-scale, complex projects Tools that compile those extensions into CSS the browser can actually read

3 styles.less LESS compiler LESS compiler styles.css input output LESS file that uses various language extensions Standard CSS file that browsers can understand

4 What’s the Difference? Language extensions are nearly identical, with a few specialized features here and there SASS is built on Ruby; LESS is built on JavaScript Both require a compile operation, but LESS has support for compiling in the browser

5 Language Extensions Variables for values used in multiple #FFB873; h1 { } footer { } LESS ( SASS uses $ instead ) h1 { color: #FF7F40; } footer { background-color: #FFB873; } Compiled CSS

6 Language Extensions Mix-Ins for sets of related 1s) { -webkit-transition: -moz-transition: -o-transition: -ms-transition: transition: } nav a {.trans; }.thumbs img {.trans(0.5s); } LESS ( SASS uses slightly different syntax ) nav a { -webkit-transition: all 1s; -moz-transition: all 1s; -o-transition: all 1s; -ms-transition: all 1s; transition: all 1s; }.thumbs img { -webkit-transition: all 0.5s; -moz-transition: all 0.5s; -o-transition: all 0.5s; -ms-transition: all 0.5s; transition: all 0.5s; } Compiled CSS

7 Language Extensions Nested Rules nav { background-color: #CCC; li { display: inline-block; } a { display: inline-block; padding: 1em; } SASS and LESS (same syntax) nav { background-color: #CCC; } nav li { display: inline-block; } nav a { display: inline-block; padding: 1em; } Compiled CSS

8 Language Extensions Rule Inheritance.headings { font-family: Arial, sans-serif; font-weight: bold; color: #0E0E0E; margin-bottom: 0.5em; } h1:extend(.headings) { font-size: 200%; } h2:extend(.headings) { font-size: 150%; } LESS ( SASS uses slightly different syntax ) h1, h2 { font-family: Arial, sans-serif; font-weight: bold; color: #0E0E0E; margin-bottom: 0.5em; } h1 { font-size: 200%; } h2 { font-size: 150%; } Compiled CSS

9 Language Extensions Functions and #FFE873; h1 { color: 10%); } footer { background-color: 50%); } footer:hover { } LESS ( SASS has Similar Functions via Compass )

10 LESS Usage During development, use less.js to compile LESS files to CSS on the client: For production, use command-line compiler to make final CSS file and link to that: lessc less/styles.less > css/styles.css Install LESS using Package Manager that comes with Node.js:LESSNode.js npm install -g less

11 SASS Usage Use command-line compiler to make CSS file: sass sass/styles.scss css/styles.css Use “Watch Mode” to automatically re-compile whenever.scss file changes sass --watch sass/styles.scss:css/styles.css Install SASS using Ruby:SASSRuby sudo gem install sass


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