JigSass Utils Position

A collection of dynamically generated utility classes for setting CSS position values

Class names follow the Emmet abbreviation syntax, with colons (':') replaced by two dashes (--) to follow BEM naming conventions (It modifiies the user agent's default position for the element). E.g., the position: absolute utility class name is .u-pos--a.

Available classes

• .u-pos--a (position: absolute)
• .u-pos--f (position: fixed)
• .u-pos--r (position: relative)
• .u-pos--s (position: static)

Additionally, JigSass Position provides the following helpers:

• .u-pos--center Used for vertically and horizontally centering absolute and fixed positioned elements inside their first non-statically positioned ancestor (or window). Will also work for relative positioned elements inside containers with explicit heights.
• .u-pos--stretch Used for stretching absolute and fixed positioned elements to the dimensions of their first non-statically positioned ancestor (or window).

Installation

Using npm:

npm i -S jigsass-utils-position

Usage

Import JigSass Utils Position into your main scss file near its very end, together with all other utilities (utilities should always be the last to be imported).

@import 'path/to/jigsass-utils-position/scss/index';

Like all other JigSass Utils, JigSass Position does not automatically generate any CSS when imported. You would need to explicitly indicate that each individual class should actually be generated in each component or object it is used in (clarification: This will include style declarations inside .foo and .bar):

// _c.foo.scss
.foo {
  @include jigsass-util(u-pos, $modifier: a); // <-- position: absolute

  ...
}

// _c.bar.scss
.bar {
  @include jigsass-util(u-pos, $modifier: r);  // <-- position: relative
  @include jigsass-util(
    u-pos,
    $modifier: f,
    $from: large
  ); // <-- position: fixed, from large bp and on.

  ...
}

Doing so helps us a great deal with portability, as no matter where we import component or object partials, the correct utility classes will be generated. Think of it as a poor man's dependency management.

Developer communication is also assisted by including "dependencies" wherever they are required, as anyone going through a partial, can easily understand how it should be marked up with just a glance.

As far as bloat goes, just don't worry about it - the actual styles will only be generated once, at the location in the cascade where the Jigsass Position partial was imported into the main file.

JigSass Position classes are responsive-enabled, using JigSass MQ and the breakpoints defined in the $jigsass-breakpoints variable.

Based on the breakpoint arguments passed to jigsass-util when including a position class, responsive modifiers are generated according to the following logic:

.u-pos--<modifier>[-[-from-<breakpoint-name>][-until-<breakpoint-name>][-misc-<breakpoint-name>]]

So, assuming the medium, large and landscape breakpoints are defined in $jigsass-breakpoints as 600px, 1024px and (orientation: landscape) respectively,

@include jigsass-util(u-pos, $modifier: f);

will generate the .u-pos--f class, which is not limited to any media-query.

@include jigsass-util(u-pos, $modifier: f, $until: medium);

will generate the .u-pos--f--until-medium class, which will be in effect at (max-width: 37.49em) and will override styles in the default class until that point.

@include jigsass-util(u-pos, $modifier: f, $from: large, $misc: landscape);

will generate the .u-pos--f--from-large-when-landscape class, which will go into effect at (min-width: 64em) and (orientation: landscape) and will override styles in the default class under these conditions.

Documentation

The full documentation was generated using mdcss, and is available at https://txhawks.github.io/jigsass-utils-position/

Contributing

It is a best practice for JigSass modules to not automatically generate css on @import, but rather have the user explicitly enable the generation of specific styles from the module.

Contributions in the form of pull-requests, issues, bug reports, etc. are welcome. Please feel free to fork, hack or modify JigSass Position in any way you see fit.

Writing documentation

Good documentation is crucial for usability, scalability and maintainability. When contributing, please do make sure that both its Sass functionality (functions, mixins, variables and placeholder selectors), as well as the CSS it generates (selectors, concepts, usage exmples, etc.) are well documented.

Jigsass Position uses Jonathan Neal's mdcss.

When styles and documentation comments are not automatically generated by your module on @import, please use the sgSrc/sg.scss file to enable their generation.

In addition, any file in sgSrc/assets will be available for use in the style guide.

File structure

┬ ./
│
├─┬ scss/ 
│ └─ index.scss # The module's importable file.
│
├─┬ sgSrc/      # Style guide sources
│ │
│ ├── sg.scc    # It is a best practice for JigSass 
│ │             # modules to not automatically generate 
│ │             # css and documentation on `@import.` 
│ │             # Please use this file to enable css
│ │             # and documentation comments) generation.
│ │
│ └── assets/   # Files in `sgSrc/assets` will be 
│               # available for use in the style guide
│
└─┬ docs/      # Documention
  │
  └── styleguide/ # Generated documentation 
                  # of the module's CSS

License: MIT