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vue-lazy-youtube-video

Vue.js logo plus YouTube logo

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>
<script src="https://unpkg.com/vue-lazy-youtube-video@1.x"></script>
<script>
  // as a plugin
  Vue.use(VueLazyYoutubeVideo.Plugin)
  // as a component
  Vue.component('LazyYoutubeVideo', VueLazyYoutubeVideo.default)
</script>

Initialization

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,
  },
}

SSR

There is special bundle for SSR users:

import Vue from 'vue'
import LazyYoutubeVideo, {
  Plugin,
} from 'vue-lazy-youtube-video/dist/vue-lazy-youtube-video.ssr.common'
// have to import ejected style directly, see this issue https://github.com/vuejs/rollup-plugin-vue/issues/266
import 'vue-lazy-youtube-video/dist/style.css'

// as a global component
Vue.component('LazyYoutubeVideo', LazyYoutubeVideo)

// or as a plugin
Vue.use(Plugin)

// or as a local component
export default {
  // ...
  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 url="https://www.youtube.com/watch?v=[VIDEO_ID]" />
</template>

Demo

Edit vue-lazy-youtube-video

API

Properties

🚨 Value of the url property must be a DIRECT link to the video (e.g. https://www.youtube.com/watch?v=4JS70KB9GS0), but not the EMBED link (e.g. https://www.youtube.com/embed/4JS70KB9GS0). Component itself will generate appropriate src attribute for the <iframe /> element

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

Property Required Type Default Description
url true string Video URL in https://www.youtube.com/watch?v=[VIDEO_ID] format. Supported URLs are listed here
query false string ?autoplay=1 Query string which will be appended to the generated embed URL
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 maxresdefault Size of the thumbnail, generated by YouTube. Available variants: default, mqdefault, sddefault, hqdefault, maxresdefault. More info
thumbnail false { webp: string, jpg: string} Custom thumbnail object, which should contain two keys: webp and jpg. Value of the key is the path to the custom thumbnail image
noCookie false boolean false Whether or not to enable privacy-enhanced mode. If true – component will insert -nocookie part into the generated embed link
iframeAttributes false object Custom attributes that will be assigned to the <iframe /> element
autoplay false boolean false Whether or not to play video as soon as component mounts into the DOM

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.

Events

Name Type Usage
videoLoaded () => void The event that is triggered when the <iframe> is inserted into the DOM.

Tests

Jest is used for unit-tests.

Unit

Jest and VueTestUtils is used for unit tests.

You can run unit tests by running the next command:

npm run test:unit

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:

β”œβ”€β”€ vue-lazy-youtube-video.common.js
β”œβ”€β”€ vue-lazy-youtube-video.esm.js
β”œβ”€β”€ vue-lazy-youtube-video.js
β”œβ”€β”€ vue-lazy-youtube-video.min.js
β”œβ”€β”€ vue-lazy-youtube-video.ssr.common.js

Powered by

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

Inspiration

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

License

MIT

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Vue.js component for lazyloading YouTube videos.

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