lgss-elements-sass
LGSS elements Sass files
Last updated 3 years ago by danblundell .
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GOV.UK elements

GOV.UK elements is three things:

  1. An online design guide, explaining how to make your service look consistent with the rest of GOV.UK.
  2. An example of how to use the code in the GOV.UK template and the GOV.UK frontend toolkit.
  3. An npm package of the Sass files.

GOV.UK elements guide

http://govuk-elements.herokuapp.com/.

Using govuk-elements-sass

GOV.UK elements has the GOV.UK frontend toolkit as a dependency.

It assumes your project is using the GOV.UK template.

The govuk_frontend_toolkit provides Sass variables, functions and mixins, they must be imported before any of the GOV.UK elements Sass files.

The govuk_frontend_toolkit's Sass files are imported at the top of _govuk-elements.scss.

Install

To install the govuk-elements-sass package, use:

`npm install govuk-elements-sass`

This installs the package as well as the packages it depends on to the local /node_modules/ folder.

Usage

To import all of the govuk-elements-sass files, import the _govuk-elements.scss partial.

@import govuk-elements;

Set a path for your image assets

If you are not using Rails or Compass, then you will need to define a $path variable in your main application stylesheet.

 $path: "/public/images/";

There is an example of this in: assets/sass/govuk-elements-styles.scss.

Alternate usage

You can pick and choose partials from the govuk-elements-sass package.

Choose these from the list of imported partials in _govuk_elements.scss.

The GOV.UK frontend toolkit scss dependencies listed below must be imported first.

// GOV.UK frontend toolkit
// Sass variables, mixins and functions
// https://github.com/alphagov/govuk_frontend_toolkit/tree/master/stylesheets

// Settings (variables)
@import "colours";                                // Colour variables
@import "font_stack";                             // Font family variables
@import "measurements";                           // Widths and gutter variables

// Mixins
@import "conditionals";                           // Media query mixin
@import "device-pixels";                          // Retina image mixin
@import "grid_layout";                            // Basic grid layout mixin
@import "typography";                             // Core bold and heading mixins
@import "shims";                                  // Inline block mixin, clearfix placeholder

// Mixins to generate components (chunks of UI)
@import "design-patterns/alpha-beta";
@import "design-patterns/buttons";

// Functions
// @import "url-helpers";                         // Function to output image-url, or prefixed path (Rails and Compass only)

If you're not using the GOV.UK template, you’ll also need to uncomment the base partial in _govuk_elements.scss, or create your own.

// @import "elements/base";                       // HTML elements, set by the GOV.UK template

Compile

Using a task runner to compile the Sass files

Add the node_modules/govuk_frontend_toolkit and node_modules/govuk-elements-sass directories to the includePaths property of your Sass plugin - if you're using a task runner like Gulp or Grunt, to reference the location of these files.

Import _govuk-elements.scss into your main.scss file.

Example folder structure

- index.html
-- node_modules
    -- govuk-elements-sass
    -- govuk_frontend_toolkit
-- assets
    -- scss
        - main.scss
    -- css
        - main.css

Using Gulp

Example Gulpfile.js

'use strict';

const gulp = require('gulp')
const sass = require('gulp-sass')

// Compile scss files to css
gulp.task('styles', () => {
  return gulp.src('./sass/**/*.scss')
    .pipe(sass({
      includePaths: [
        'node_modules/govuk_frontend_toolkit/stylesheets', // 1
        'node_modules/govuk-elements-sass/public/sass'     // 2
      ]
    }).on('error', sass.logError))
    .pipe(gulp.dest('./css'))
})

In the example above includePaths uses two paths to resolve the scss @import statements.

  1. The location of the directory containing the govuk_frontend_toolkit sass files.
  2. The location of the directory containing the govuk-elements-sass files.

Using Grunt

Example Gruntfile.js

grunt.loadNpmTasks('grunt-contrib-sass')

grunt.initConfig({
  sass: {
    dist: {
      options: {
        includePaths: [
          'node_modules/govuk_frontend_toolkit/stylesheets', // 1
          'node_modules/govuk-elements-sass/public/sass'     // 2
        ],
      },
      files: {
        'main.css': 'main.scss'
      }
    }
  }
})

In the example above includePaths uses two paths to resolve the scss @import statements.

  1. The location of the directory containing the govuk_frontend_toolkit sass files.
  2. The location of the directory containing the govuk-elements-sass files.

Running this site locally

If you would like to clone the repository and run it locally, you will need Node.js (at least version v0.10.0).

Clone this repository

git clone git@github.com:alphagov/govuk_elements.git

Install all dependencies

npm install

Run the app

npm start

Go to localhost:3000 in your browser.

Running tests

To check the whole codebase, run:

npm test

Linting

GOV.UK lint

GOV.UK elements uses govuk-lint, which uses scss-lint as its scss linter.

Standard JavaScript

GOV.UK elements uses standardjs, an opinionated JavaScript linter. All JavaScript files follow its conventions.

Both linters run on CI to ensure that new pull requests are in line with them.

Running Wraith to compare changes

GOV.UK elements uses Wraith so that regressions can be easily spotted.

This needs to be run from the Wraith directory /tests/wraith and some dependencies need to be installed on the local machine first.

  1. Install Wraith and its dependencies.

    gem install wraith brew install phantomjs brew install imagemagick

  2. Take a baseline of the current version.

On master run:

wraith history config.yaml
  1. Switch to your feature branch and make changes.

On your feature branch run:

wraith latest config.yaml

Pattern libraries using GOV.UK elements

Here are examples of service-specific pattern libraries using GOV.UK elements.

Contributing

You can find contribution guidelines in CONTRIBUTING.md

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