Viewports

A tiny (900 byte gzipped) media query utility for programmatic control in different screen viewports within the browser.

Install

The module is shipped for ESM consumption in the Browser.

pnpm add @panoply/viewports

Basic Usage

The module uses a named export.

import * as viewport from '@panoply/viewports';

viewport.screens([
  {
    id: 'sm',
    query: '(max-width: 576px)',
    onenter: () => {
      console.log('Screen size is below 576px');
    },
    onexit: () => {
      console.log('Screen size is above 576px');
    }
  },
  {
    id: 'md',
    query: '(min-width: 768px) and (max-width: 992px)',
    onenter: () => {
      console.log('Screen size above 768px but below 992px');
    },
    onresize: x => {
      console.log('Screen size is: ' + x);
    },
    onexit: () => {
      console.log('Left the viewport');
    }
  }
]);

You can optionally choose to provide an {} instead of array list. The id value is required and if no query is provided it will default to all.

Methods

The module provides several helpful methods for querying and retrieving context of the browsers screen.

import * as viewport from '@panoply/viewports';

viewport.add(id, {})       // Extends the screen with new methods
viewport.get(id)           // Returns the viewport and screen matching the id
viewport.active()          // List of active screens or single screen
viewport.active(id)        // Boolean indicating whether the screen is active
viewport.list()            // List of viewport screens states
viewport.list(ids[])       // List of viewport screen states matching the ids
viewport.remove(id)        // Remove a viewport matching the id from store
viewport.destroy()         // Tear down and remove all instances

Store

The module maintains a store within a constant named viewports which you can access as a named import. The store is maintained within a Mapand each key value uses the screen ids, that values hold the screen instances.

import { viewports } from '@panoply/viewports';

viewports.forEach(viewport => {


  // SCREEN INSTANCE GETTER

  viewport.screen            // The screen instance
  viewport.screen.id         // The screen id value
  viewport.screen.query      // The media query value
  viewport.screen.active     // A boolean value indicating whether the viewport is active
  viewport.screen.oninit     // A Set list of methods to invoke oninit
  viewport.screen.onenter    // A Set list of methods to invoke onenter
  viewport.screen.onexit     // A Set list of methods to invoke onexit
  viewport.screen.onresize   // A Set list of methods to invoke when resizing

  // METHOD TRIGGERS

  viewport.oninit()          // Calls all methods in screen.oninit Set (null if already invoked)
  viewport.onenter()         // Calls all methods in screen.onenter Set
  viewport.onexit()          // Calls all methods in screen.onexit Set
  viewport.onresize()        // Calls all methods in screen.onresize Set

})