/ Miscellaneous

A fine API to manage media queries in JS with ease

A fine API to manage media queries in JS with ease

fine-mq

A fine API to manage media queries in JS with ease. It has first-class integration with VueJS.

Installation

  • Using NPM/Yarn
npm i fine-mq
# or
yarn add fine-mq
  • Using unpkg.com
<script src="https://unpkg.com/fine-mq/dist/fine-mq.min.js"></script>

This main file exposes a install function (Vue plugin), a Mq class and toMqString function.

These are all the builds available via unpkg:

Usage

This package is a set of three libs.

  • A vue plugin that exposes useful properties on vue instances, a component and a directive. This lib includes the two others. (FineMq)
  • A media query interface that lets you add/remove aliases to media queries, register/unregister handlers that listen to matching state of a media query or alias. (Mq)
  • A lib that exposes a single function that helps you transorm a media query written as a JavaScript object to its string value. (toMqString)

Vue plugin

Define your breakpoints and/or aliases to media queries and start using them with Vue.

import Vue from 'vue'
import FineMq from 'fine-mq'
import App from './App'

// Define your aliases
// NOTE: any size can be expressed as a number, anything that can be casted to a finite number, Infinity, or a size in 'px' or 'em' unit.

Vue.use(FineMq, {
  aliases: {
    sm: 680, // <=> [0, 680]
    md: [681, 1024],
    lg: [1025], // <=> [1025, Infinity]
    landscape: '(orientation: landscape)',
    an_alias_name: {
      screen: true,
      minWidth: '23em',
      maxWidth: '768px'
    }
  }
})
// or just Vue.use(FineMq). By default aliases are { sm: 680, md: [681, 1024], lg: [1025] }

// => This will register the following aliases:
// {
//   sm: '(max-width: 680px)',
//   'sm+': '(min-width: 681px)',
//   md: '(min-width: 681px) and (max-width: 1024px)',
//   'md+': '(min-width: 1025px)',
//   'md!': '(min-width: 681px)',
//   lg: '(min-width: 1025px)',
//   landscape: '(orientation: landscape)',
//   an_alias_name: 'screen and (min-width: 380px) and (max-width: 768px)'
// }

// Three reactive properties will then be available on Vue instances:
// - `$mqAliases` is an object that contains the matching state for each alias in the form { [alias]: true/false }.
// - `$lastActiveMQAlias` will contains the last alias that matched and triggered the listener.
// - `$mq` is a Mq instance. See below.

NOTE 1: Absurd modifiers will not be created (ex: when the lower bound is 0, there is no need for the «!» modifier, or if the upper bound is Infinity, there is no need for both «!» and «+» modifiers).

NOTE 2: If you specify the unit for your size, the + 1 operation will not be performed.

Then in your templates, you can use the globally defined MqShow component or v-mq-show-if directive.

  • The MqShow component facilitate conditional rendering with media queries. It renders its content only when one fo the given media queries matches. Cons: If the slot content has multiple root nodes, they will be wrapped by a DIV tag but you can customize the wrapper tag to render with the tag prop.

The if prop if required and can be a String/Array/Object. Modifiers are also supported (for both the component and the directive) by appending it at the end of the alias («+» for greater breakpoints, «!» for current AND greater breakpoints).

<MqShow if="sm">
  <!-- slot ...-->
</MqShow>

<!-- or -->
<MqShow if="only screen and (min-width: 200px)"> <!-- any valid media query works -->
  <!-- slot ... -->
</MqShow>

<!-- or -->
<MqShow if="md+"> <!-- The `+` modifier here means «above md» -->
  <!-- slot ... -->
</MqShow>

<!-- or -->
<MqShow if="md!"> <!-- The `!` modifier here means «md AND above md» -->
  <!-- slot ... -->
</MqShow>

<!-- or -->
<MqShow :if="['sm', 'md+']"> <!-- array of aliases (with or without modifier) or valid media queries -->
  <!-- slot ... -->
</MqShow>

<!-- or -->
<MqShow :if="{orientation: 'landscape'}"> <!-- object notation is also supported -->
  <!-- slot ... -->
</MqShow>

<!-- or -->
<MqShow if="an_alias_name">
  <!-- slot ... -->
</MqShow>
  • The v-mq-show-if directive sets the display property of the bound element's style to 'none' only when none of the given media queries matches. Cons: The rendered element will still appear in the DOM tree even if not displayed. Usage is the same as for the component.
<div v-mq-show-if="'sm'">...</div>

<!-- or -->
<div v-mq-show-if="'only screen and (min-width: 200px)'">...</div>

<!-- or -->
<div v-mq-show-if="'md+'">...</div>

<!-- or -->
<div v-mq-show-if="'md!'">...</div>

<!-- or -->
<div v-mq-show-if="['sm', 'md+']">...</div>

<!-- or -->
<div v-mq-show-if="{orientation: 'landscape'}">...</div>

<!-- or -->
<div v-mq-show-if="'an_alias_name'">...</div>

Mq API

The Mq class exposes a fine API that lets you handle media query changes on your page on the JavaScript side.

Usage example

import Mq from 'fine-mq/dist/mq'

const mq = new Mq({
  small: 'only screen and (max-width: 480px)',
  medium: 'only screen and (min-width: 480px) and (max-width: 720px)'
})

const defaultColor = '#FFF'

const changeColor = color => ({matcher, alias}) => {
  document.body.style.backgroundColor = matcher.mathces ? color : defaultColor
}

mq.on('small', changeColor('blue'))
mq.on('medium', changeColor('green'))
mq.on('only screen and (min-width: 720px)', changeColor('red'))

API description

const mq = new Mq(aliases)

Initialise a new Mq. Aliases can be registered afterwards.

mq.alias(alias[, query]) / mq.unalias(alias)

Register an alias for a query, or register multiple aliases at once via an object.

mq.alias('small', '(max-width: 100px)')
mq.alias({
  small: '(max-width: 100px)',
  medium: '(max-width: 200px)'
})

Then you can unregister previously registered aliases with mq.unalias(alias).

mq.on(query, callback, context)

Register a callback which will be executed with the given context everytime the match state (true/false) for a query or alias. If context is not specified, it will default to the mq instance.

// `alias` is the given alias or query and `matcher` is the matchMedia object for that query.
mq.on('(max-width: 400px)', ({matcher, alias}) => {})
mq.on('smartphones', ({matcher, alias}) => {}, {})
mq.off(query, callback, context)

Remove all callbacks for all queries:

mq.off()

Remove all callbacks for a query or alias:

mq.off('(max-width: 400px)')

Remove a specific callback for a query or alias:

mq.off('(max-width: 400px)', () => {})

Remove a specific callback with a specific context for a query or alias:

mq.off('(max-width: 400px)', () => {}, {})

Tip: All methods (alias, unalias, on and off) return this so that you can chain them.

NOTE: The Mq class is written independantly from toMqString meaning that the object-style notation for queries is not supported here.

toMqString

This function can generate a valid media query string from a javascript object.

Usage example

import toMqString from 'fine-mq/dist/to-mq-string'

toMqString({minWidth: 100, maxWidth: 200});
// -> '(min-width: 100px) and (max-width: 200px)'
Media type
toMqString({screen: true});  // -> 'screen'
Media type with negation
toMqString({handheld: false});  // -> 'not handheld'
Media features can be specified in camel case
toMqString({minWidth: 100, maxWidth: 200});
// -> '(min-width: 100px) and (max-width: 200px)'
px is added to numeric dimension values
toMqString({minWidth: 100, maxWidth: '20em'});
// -> '(min-width: 100px) and (max-width: 20em)'
Multiple media queries can be passed as an array
toMqString([{screen: true, minWidth: 100}, {handheld: true, orientation: 'landscape'}]);
// -> 'screen and (min-width: 100px), handheld and (orientation: landscape)'

NOTE: When passing an array to the Vue component/directive and you want it to be considered as one media query like in the last example, remember to wrap it in another array like this: [[{screen: true, minWidth: 100}, {handheld: true, orientation: 'landscape'}]] (that will register a single listener for 'screen and (min-width: 100px), handheld and (orientation: landscape)' instead of multiple listeners, one for 'screen and (min-width: 100px)' and another for 'handheld and (orientation: landscape)' )

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