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css-custom-properties

v0.1.0

Published

Work with CSS Custom Properties in Javascript

Downloads

34

Readme

CSS Custom Properties

This module provides utilities to work with CSS custom properties in Javascript.

Getting Started

Installation

Install the package with the following command

npm install --save css-custom-properties

Usage

Example:

// Import using ES5 syntax
var CssCustomProperties = require('css-custom-properties');

// Import using ES6 syntax
import CssCustomProperties from 'css-custom-properties';

// Set a CSS variable
CssCustomProperties.set({
  'my-var': '16px',
  'my-other-var': 0.5,
});

// Get a CSS variable's value
console.log(CssCustomProperties.get('my-var'));
// => '16px'

// Get all CSS variables
console.log(CssCustomProperties.getAll());
// => {'my-var': '16px', 'my-other-var': 0.5}

// Check if a CSS variable has been set
console.log(CssCustomProperties.has('my-var'));
// => true

// Remove a CSS variable
console.log(CssCustomProperties.unset('my-var'));
// => '16px'

// Check if a CSS variable has been set
console.log(CssCustomProperties.has('my-var'));
// => false

Documentation

The package exposes the following methods.

CssCustomProperties.set(collection, [element])

This method sets CSS variables on a DOM element.

Arguments

  • collection (Object): The collection of CSS variable-value pairs.
  • [element] (DOM Element): (Optional) The DOM element to apply the css variable to. Defaults to the global :root element.

Returns

  • (Object) returns collection.

Example

var variables = CssCustomProperties.set({
  'my-var': '16px',
  'my-other-var': 0.5,
  '--my-prefixed-var': 'red',
});

console.log(variables);
// => {'my-var': '16px', 'my-other-var': 0.5, 'my-prefixed-var': 'red'}

CssCustomProperties.get(variable, [element])

This method gets a CSS variable's value on a DOM element.

Arguments

  • variable (String): The CSS variable name.
  • [element] (DOM Element): (Optional) The DOM element to get the css variable from. Defaults to the global :root element.

Returns

  • (*): returns matched variable's value, else undefined.

Example

var myVar = CssCustomProperties.get('my-var');

console.log(myVar);
// => '16px'

var myNonExistantVar = CssCustomProperties.get('my-non-existant-var');

console.log(myNonExistantVar);
// => undefined

CssCustomProperties.getAll([element])

This method gets all CSS variables on a DOM element.

Arguments

  • [element] (DOM Element): (Optional) The DOM element to get the css variables from. Defaults to the global :root element.

Returns

  • (Object): returns collection of CSS variable-value pairs.

Example

CssCustomProperties.set({
  'my-var': '16px',
  'my-other-var': 0.5,
});
CssCustomProperties.set({
  'another-one': 0,
});

var allVars = CssCustomProperties.getAll();
console.log(allVars);
// => {'my-var': '16px', 'my-other-var': 0.5, 'another-one': 0}

CssCustomProperties.getAllPrefixed([element])

This method gets all CSS variables on a DOM element. Like getAll() but with prefixed variable names.

Arguments

  • [element] (DOM Element): (Optional) The DOM element to get the css variables from. Defaults to the global :root element.

Returns

  • (Object): returns collection of prefixed CSS variable-value pairs.

Example

CssCustomProperties.set({
  'my-var': '16px',
  'my-other-var': 0.5,
});
CssCustomProperties.set({
  'another-one': 0,
});

var allVars = CssCustomProperties.getAll();
console.log(allVars);
// => {'--my-var': '16px', '--my-other-var': 0.5, '--another-one': 0}

CssCustomProperties.has(variable, [element])

This method checks if a CSS variable exists on a DOM element.

Arguments

  • variable (String): The CSS variable name.
  • [element] (DOM Element): (Optional) The DOM element to get the css variable from. Defaults to the global :root element.

Returns

  • (boolean): returns true if CSS variable exists on element, else false.

Example

var myVarExists = CssCustomProperties.has('my-var');
console.log(myVarExists);
// => true

var myNonExistantVarExists = CssCustomProperties.get('my-non-existant-var');
console.log(myNonExistantVarExists);
// => false

CssCustomProperties.unset(variable, [element])

This method removes a CSS variable from a DOM element.

Arguments

  • variable (String): The CSS variable name.
  • [element] (DOM Element): (Optional) The DOM element to remove the css variable from. Defaults to the global :root element.

Returns

  • (*): returns the value of the removed variable.

Example

var variables = CssCustomProperties.set({
  'my-var': '16px',
  'my-other-var': 0.5,
});

var removedVar = CssCustomProperties.unset('my-other-var');
// => 0.5

var allVars = CssCustomProperties.getAll();
console.log(allVars);
// => {'my-var': '16px'}

CssCustomProperties.unsetAll(variable, [element])

This method removes all CSS variable from a DOM element.

Arguments

  • [element] (DOM Element): (Optional) The DOM element to remove the css variable from. Defaults to the global :root element.

Returns

  • (*): returns the collection of removed variables.

Example

var variables = CssCustomProperties.set({
  'my-var': '16px',
  'my-other-var': 0.5,
});

var removedVars = CssCustomProperties.unsetAll();
// => {'my-var': '16px', 'my-other-var': 0.5}

var allVars = CssCustomProperties.getAll();
console.log(allVars);
// => {}

CssCustomProperties.prefix(item)

Adds the "--" prefix if it doesn't already exists.

Arguments

  • [item] (String|Object|Array): The variable name or collection of variable names to prefix.

Returns

  • (*): The prefixed result.

Example

CssCustomProperties.prefix('var');
// => '--var'

CssCustomProperties.prefix(['var', '--other-var']);
//=> ['--var', '--other-var']

CssCustomProperties.prefix({
  '--var': 10,
  'other-var': 'green',
});
//=> {'--var': 10, '--other-var': 'green'}

CssCustomProperties.unprefix(item)

Trim the "--" prefix, if it exists.

Arguments

  • [item] (String|Object|Array): The variable name or collection of variable names to trim.

Returns

  • (*): The trimmed result.

Example

CssCustomProperties.unprefix('--var');
// => 'var'

CssCustomProperties.unprefix(['var', '--other-var']);
//=> ['var', 'other-var']

CssCustomProperties.unprefix({
  '--var': 10,
  'other-var': 'green',
});
//=> {'var': 10, 'other-var': 'green'}