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Showing content from https://github.com/hilongjw/vue-lazyload below:

hilongjw/vue-lazyload: A Vue.js plugin for lazyload your Image or Component in your application.

Vue module for lazyloading images in your applications. Some of goals of this project worth noting include:

Be lightweight, powerful and easy to use
Work on any image type
Add loading class while image is loading
Supports both of Vue 1.0 and Vue 2.0

Please use vue-lazyload@3.x, see here

Demo

Vue.js 1.x or 2.x

CDN: https://unpkg.com/vue-lazyload/vue-lazyload.js

<script src="https://unpkg.com/vue-lazyload/vue-lazyload.js"></script>
<script>
  Vue.use(VueLazyload)
  ...
</script>

main.js:

import Vue from 'vue'
import App from './App.vue'
import VueLazyload from 'vue-lazyload'

Vue.use(VueLazyload)

// or with options
const loadimage = require('./assets/loading.gif')
const errorimage = require('./assets/error.gif')

Vue.use(VueLazyload, {
  preLoad: 1.3,
  error: errorimage,
  loading: loadimage,
  attempt: 1
})

new Vue({
  el: 'body',
  components: {
    App
  }
})

template:

<ul>
  <li v-for="img in list">
    <img v-lazy="img.src" >
  </li>
</ul>

use v-lazy-container work with raw HTML

<div v-lazy-container="{ selector: 'img' }">
  <img data-src="//domain.com/img1.jpg">
  <img data-src="//domain.com/img2.jpg">
  <img data-src="//domain.com/img3.jpg">  
</div>

custom error and loading placeholder image

<div v-lazy-container="{ selector: 'img', error: 'xxx.jpg', loading: 'xxx.jpg' }">
  <img data-src="//domain.com/img1.jpg">
  <img data-src="//domain.com/img2.jpg">
  <img data-src="//domain.com/img3.jpg">  
</div>

<div v-lazy-container="{ selector: 'img' }">
  <img data-src="//domain.com/img1.jpg" data-error="xxx.jpg">
  <img data-src="//domain.com/img2.jpg" data-loading="xxx.jpg">
  <img data-src="//domain.com/img3.jpg">  
</div>

key description default options preLoad proportion of pre-loading height 1.3 Number error src of the image upon load fail 'data-src' String loading src of the image while loading 'data-src' String attempt attempts count 3 Number listenEvents events that you want vue listen for ['scroll', 'wheel', 'mousewheel', 'resize', 'animationend', 'transitionend', 'touchmove'] Desired Listen Events adapter dynamically modify the attribute of element { } Element Adapter filter the image's listener filter { } Image listener filter lazyComponent lazyload component false Lazy Component dispatchEvent trigger the dom event false Boolean throttleWait throttle wait 200 Number observer use IntersectionObserver false Boolean observerOptions IntersectionObserver options { rootMargin: '0px', threshold: 0.1 } IntersectionObserver silent do not print debug info true Boolean

You can configure which events you want vue-lazyload by passing in an array of listener names.

Vue.use(VueLazyload, {
  preLoad: 1.3,
  error: 'dist/error.png',
  loading: 'dist/loading.gif',
  attempt: 1,
  // the default is ['scroll', 'wheel', 'mousewheel', 'resize', 'animationend', 'transitionend']
  listenEvents: [ 'scroll' ]
})

This is useful if you are having trouble with this plugin resetting itself to loading when you have certain animations and transitions taking place

dynamically modify the src of image

Vue.use(vueLazy, {
    filter: {
      progressive (listener, options) {
          const isCDN = /qiniudn.com/
          if (isCDN.test(listener.src)) {
              listener.el.setAttribute('lazy-progressive', 'true')
              listener.loading = listener.src + '?imageView2/1/w/10/h/10'
          }
      },
      webp (listener, options) {
          if (!options.supportWebp) return
          const isCDN = /qiniudn.com/
          if (isCDN.test(listener.src)) {
              listener.src += '?imageView2/2/format/webp'
          }
      }
    }
})

Vue.use(vueLazy, {
    adapter: {
        loaded ({ bindType, el, naturalHeight, naturalWidth, $parent, src, loading, error, Init }) {
            // do something here
            // example for call LoadedHandler
            LoadedHandler(el)
        },
        loading (listender, Init) {
            console.log('loading')
        },
        error (listender, Init) {
            console.log('error')
        }
    }
})

use Intersection Observer to to improve performance of a large number of nodes.

Vue.use(vueLazy, {
  // set observer to true
  observer: true,

  // optional
  observerOptions: {
    rootMargin: '0px',
    threshold: 0.1
  }
})

Vue.use(VueLazyload, {
  lazyComponent: true
});

<lazy-component @show="handler">
  <img class="mini-cover" :src="img.src" width="100%" height="400">
</lazy-component>

<script>
  {
    ...
    methods: {
      handler (component) {
        console.log('this component is showing')
      }
    }

  }
</script>

Use in list

<lazy-component v-for="(item, index) in list" :key="item.src" >
  <img class="mini-cover" :src="item.src" width="100%" height="400">
</lazy-component>

vue-lazyload will set this img element's src with imgUrl string

<script>
export default {
  data () {
    return {
      imgObj: {
        src: 'http://xx.com/logo.png',
        error: 'http://xx.com/error.png',
        loading: 'http://xx.com/loading-spin.svg'
      },
      imgUrl: 'http://xx.com/logo.png' // String
    }
  }
}
</script>

<template>
  <div ref="container">
     <img v-lazy="imgUrl"/>
     <div v-lazy:background-image="imgUrl"></div>

     <!-- with customer error and loading -->
     <img v-lazy="imgObj"/>
     <div v-lazy:background-image="imgObj"></div>

     <!-- Customer scrollable element -->
     <img v-lazy.container ="imgUrl"/>
     <div v-lazy:background-image.container="img"></div>

    <!-- srcset -->
    <img v-lazy="'img.400px.jpg'" data-srcset="img.400px.jpg 400w, img.800px.jpg 800w, img.1200px.jpg 1200w">
    <img v-lazy="imgUrl" :data-srcset="imgUrl' + '?size=400 400w, ' + imgUrl + ' ?size=800 800w, ' + imgUrl +'/1200.jpg 1200w'" />
  </div>
</template>

There are three states while img loading

loading loaded error

<img src="imgUrl" lazy="loading">
<img src="imgUrl" lazy="loaded">
<img src="imgUrl" lazy="error">

<style>
  img[lazy=loading] {
    /*your style here*/
  }
  img[lazy=error] {
    /*your style here*/
  }
  img[lazy=loaded] {
    /*your style here*/
  }
  /*
  or background-image
  */
  .yourclass[lazy=loading] {
    /*your style here*/
  }
  .yourclass[lazy=error] {
    /*your style here*/
  }
  .yourclass[lazy=loaded] {
    /*your style here*/
  }
</style>

vm.$Lazyload.$on(event, callback) vm.$Lazyload.$off(event, callback) vm.$Lazyload.$once(event, callback)

$on Listen for a custom events loading, loaded, error
$once Listen for a custom event, but only once. The listener will be removed once it triggers for the first time.
$off Remove event listener(s).

{string} event
{Function} callback

vm.$Lazyload.$on('loaded', function ({ bindType, el, naturalHeight, naturalWidth, $parent, src, loading, error }, formCache) {
  console.log(el, src)
})

{string} event
{Function} callback

vm.$Lazyload.$once('loaded', function ({ el, src }) {
  console.log(el, src)
})

If only the event is provided, remove all listeners for that event

{string} event
{Function} callback

function handler ({ el, src }, formCache) {
  console.log(el, src)
}
vm.$Lazyload.$on('loaded', handler)
vm.$Lazyload.$off('loaded', handler)
vm.$Lazyload.$off('loaded')

vm.$Lazyload.lazyLoadHandler

Manually trigger lazy loading position calculation

this.$Lazyload.lazyLoadHandler()

this.$Lazyload.$on('loaded', function (listener) {
  console.table(this.$Lazyload.performance())
})

Dynamic switching pictures

 <img v-lazy="lazyImg" :key="lazyImg.src">

The MIT License

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