vue-lazy-youtube-video

1.x documentation can be found here.

• vue-lazy-youtube-video
  • Features
  • Installation
    • Via NPM
    • Via Yarn
    • Directly in browser
  • Initialization
    • Styles
    • As a global component
    • As a local component
    • As a plugin
  • Usage
  • Demo
  • API
    • Properties
    • Events
    • Methods
    • Slots
    • FAQ
  • Tests
    • Unit
  • TypeScript support
  • Development
  • Build
  • Powered by
  • Inspiration
  • License

Features

• reduces initial load size by ~1.1MB per video
• built with a11y in mind – fully accessible via keyboard and to screen readers
• .webp thumbnail format for modern browsers that support it, with .jpg fallback for browsers that don't
• fully customizable through props and slots

Installation

Via NPM

$ npm install vue-lazy-youtube-video --save

Via Yarn

$ yarn add vue-lazy-youtube-video

Directly in browser

<script src="https://cdn.jsdelivr.net/npm/vue"></script>
<!-- Styles with CSS Custom Properties -->
<link rel="stylesheet" href="https://unpkg.com/vue-lazy-youtube-video/dist/style.css"></link>
<!-- Minified styles with CSS Custom Properties -->
<!-- <link rel="stylesheet" href="https://unpkg.com/vue-lazy-youtube-video/dist/style.min.css"></link> -->
<!-- Styles without CSS Custom Properties -->
<!-- <link rel="stylesheet" href="https://unpkg.com/vue-lazy-youtube-video/dist/style.simplified.css"></link> -->
<!-- Minified styles without CSS Custom Properties -->
<!-- <link rel="stylesheet" href="https://unpkg.com/vue-lazy-youtube-video/dist/style.simplified.min.css"></link> -->
<script src="https://unpkg.com/vue-lazy-youtube-video"></script>
<script>
  // as a plugin
  Vue.use(VueLazyYoutubeVideo.Plugin)
  // as a component
  Vue.use('LazyYoutubeVideo', VueLazyYoutubeVideo.default)
</script>

Initialization

Styles

import 'vue-lazy-youtube-video/dist/style.css'

As a global component

⚠️ It must be called before new Vue().

import Vue from 'vue'
import LazyYoutubeVideo from 'vue-lazy-youtube-video'

Vue.component('LazyYoutubeVideo', LazyYoutubeVideo)

As a local component

import LazyYoutubeVideo from 'vue-lazy-youtube-video'

export default {
  name: 'YourAwesomeComponent',
  components: {
    LazyYoutubeVideo,
  },
}

As a plugin

⚠️ It must be called before new Vue().

import Vue from 'vue'
import { Plugin } from 'vue-lazy-youtube-video'

Vue.use(Plugin)

Usage

<template>
  <LazyYoutubeVideo src="https://www.youtube.com/embed/4JS70KB9GS0" />
</template>

Demo

API

Properties

The list of available props (with their types, default values and descriptions) is listed below:

Property	Required	Type	Default	Description
src	true	string		<iframe />'s src attribute in https://www.youtube.com/embed/[VIDEO_ID] format. URL can contain any query part, but notice that autoplay=1 is always appended
alt	false	string	Video thumbnail	Value of the alt attribute of the thumbnail <img /> element
buttonLabel	false	string	Play video	Value of the aria-label attribute of the play <button></button> element. Improves a11y
aspectRatio	false	string	16:9	Aspect ratio of the video. This prop helps to save proportions of the video on different container sizes. Should match the number:number pattern
previewImageSize	false	string		Size of the thumbnail, generated by YouTube. Available variants: default, mqdefault, hqdefault, sddefault, maxresdefault. More info
thumbnail	false	{ jpg: string, webp?: string }		Custom thumbnail object, which should contain two keys: webp and jpg. Value of the key is the path to the custom thumbnail image
iframeAttributes	false	object	{ allowfullscreen: true, frameborder: 0, allow: 'accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture' }	Custom attributes that will be assigned to the <iframe /> element
webp	false	boolean	true	Whether or not try to load .webp thumbnail in favor of .jpg. Note that old videos may not have generated .webp thumbnail
autoplay	false	boolean	false	Whether or not to play video as soon as component mounts into the DOM
thumbnailListeners	false	Record<string, Function | Function[]>		Listeners that will be attached to the preview thumbnail
enablejsapi	false	boolean	false	Include 'enablejapi=1' parameter to the generated src attribute of the <iframe /> element. This will allow you to listen to the init:player event as well as access the YT.Player instance via the getPlayerInstance method. Make sure you have injected the proper YouTube <script /> tag or passed the injectPlayerScript prop
playerOptions	false	Partial<YT.PlayerOptions>	{}	Options the will be passed to the YT.Player constructor
injectPlayerScript	false	boolean	false	Will auto inject the proper YouTube <script /> when enablejapi is passed and there is no window.YT.Player
parameters	false	YT.Parameters	{}	YouTube Parameters that will be injected into the generated <iframe /> src attribute

Events

Name	Payload	Description
'load:iframe'	{ iframe?: HTMLIFrameElement }	Happens when native' <iframe /> element load event fires
'init:player'	{ instance: YT.Player }	Happens when the YT.Player instance is instantiated

Methods

Name	Type	Description
getPlayerInstance	() => Nullable<YT.Plater>	Returns an instance of the YT.Player when the enablejapi prop is passed and the YT.Player is initialized (check 'init:player' event), in other cases returns null

Slots

Component provides some slots.

The list of available slots is listed below:

Slot	Description
button	Slot gives an ability to provide custom play button
icon	Slot gives an ability to provide custom icon of the play button

⚠️ Note, that when button slot is passed and this slot contains <button></button>, ones should not to forget to add aria-label (if this button contains only icon) and type="button" attributes. Also, if that button do not contain .y-video-button class, all default styles will be lost, so style concerns it's up to developer.

FAQ

Question: How to play/pause/stop a video?

Answer: Pass the enablejapi prop and then listen to 'init:player' event to get an instance of the YT.Player. All the available instance methods you can find here. Hint: You can also get a player instance via the getPlayerInstance method.

Code

<LazyYoutubeVideo
  ref="youtube"
  src="..."
  enablejsapi
  @init:player="onPlayerInit"
/>

import { InitPlayerEventPayload } from 'vue-lazy-youtube-video'
{
  // ...
  methods: {
    onPlayerInit(payload: InitPlayerEventPayload) {
      console.log(payload.instance)
      console.log(this.$refs.youtube.getPlayerInstance())
    },
  },
  // ...
}

Tests

You can run unit tests by running the next command:

npm run test

Unit

Jest is used for unit-tests.

Jest and VueTestUtils is used for unit tests.

You can run unit tests by running the next command:

npm run test:unit

TypeScript support

Component is completely built and tested using TypeScript.

Here is the list of the types you can use:

// import type {} TypeScript 3.8 +
import {
  Props,
  LoadIframeEventPayload,
  InitPlayerEventPayload,
  Thumbnail,
} from 'vue-lazy-youtube-video'

Development

1. Clone this repository
2. Install dependencies using yarn install or npm install
3. Start development server using npm run dev script

Build

To build the production ready bundle simply run npm run build:

After the successful build the following files will be generated in the dist folder:

├── vue-lazy-youtube-video.common.js
├── vue-lazy-youtube-video.esm.js
├── vue-lazy-youtube-video.js
├── vue-lazy-youtube-video.min.js
├── style.css
├── style.min.css
├── style.simplified.css
├── style.simplified.min.css

Powered by

• Vue
• Rollup (and plugins)
• Babel
• Jest
• Vue Test Utils
• TypeScript
• PostCSS

Inspiration

Inspired by Vadim Makeev. Vadim created a comprehensive tutorial in which he shows how to lazyload YouTube videos properly.

License

MIT