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https://github.com/jambonn/vue-lazyload
Vue module for lazy-loading images in your vue 3 applications.
https://github.com/jambonn/vue-lazyload
Last synced: about 2 months ago
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Vue module for lazy-loading images in your vue 3 applications.
- Host: GitHub
- URL: https://github.com/jambonn/vue-lazyload
- Owner: jambonn
- License: mit
- Created: 2021-04-13T11:17:57.000Z (over 3 years ago)
- Default Branch: master
- Last Pushed: 2024-03-27T02:25:24.000Z (6 months ago)
- Last Synced: 2024-04-27T05:32:23.075Z (5 months ago)
- Language: JavaScript
- Size: 81.1 KB
- Stars: 32
- Watchers: 3
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE.md
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README
# Vue-Lazyload
Vue module for lazyloading images in your Vue 3 applications. This module is base on vue-lazyload. Vue 1.x or 2.x please use [vue-lazyload](https://github.com/hilongjw/vue-lazyload). 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 Vue 3
# Table of Contents
* [___Requirements___](#requirements)
* [___Installation___](#installation)
* [___Usage___](#usage)
* [___Constructor Options___](#constructor-options)
* [___Implementation___](#implementation)
* [___Basic___](#basic)
* [___Css state___](#css-state)
* [___Methods___](#methods)
* [__Event hook__](#event-hook)
* [__LazyLoadHandler__](#lazyloadhandler)
* [__Performance__](#performance)
* [___Authors && Contributors___](#authors-&&-Contributors)
* [___License___](#license)
# Requirements
- [Vue.js](https://github.com/vuejs/vue-next) `3.x`
# Installation
## npm
```bash
$ npm i @jambonn/vue-lazyload
```
## yarn
```bash
$ yarn add @jambonn/vue-lazyload
```
## CDN
CDN: [https://unpkg.com/@jambonn/vue-lazyload/dist/vue-lazyload.umd.js](https://unpkg.com/@jambonn/vue-lazyload/dist/vue-lazyload.umd.js)
```html
var AttributeBindingApp = {
data() {
return {
message: 'Vue Lazyload'
}
}
}
var app = Vue.createApp(AttributeBindingApp)
app.use(window['vue-lazyload'].default)
app.mount('#bind-attribute')
...
```
# Usage
main.js:
```javascript
import { createApp } from 'vue'
import VueLazyload from '@jambonn/vue-lazyload'
import App from './App.vue'
const app = createApp(App)
app.use(VueLazyload)
// or with options
const loadimage = require('./assets/loading.gif')
const errorimage = require('./assets/error.gif')
app.use(VueLazyload, {
preLoad: 1.3,
error: errorimage,
loading: loadimage,
attempt: 1
})
app.mount('#app')
```
template:
```html
```
use `v-lazy-container` work with raw HTML
```html
```
custom `error` and `loading` placeholder image
```html
```
```html
```
## Constructor Options
|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](#desired-listen-events) |
|`adapter`| dynamically modify the attribute of element |`{ }`| [Element Adapter](#element-adapter) |
|`filter`| the image's listener filter |`{ }`| [Image listener filter](#image-listener-filter) |
|`lazyComponent`| lazyload component | `false` | [Lazy Component](#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](#intersectionobserver)|
| `silent`|do not print debug info|`true`|`Boolean`|
### Desired Listen Events
You can configure which events you want vue-lazyload by passing in an array
of listener names.
```javascript
const app = createApp(AttributeBindingApp)
app.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
### Image listener filter
dynamically modify the src of image
```javascript
const app = createApp(AttributeBindingApp)
app.use(VueLazyload, {
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'
}
}
}
})
```
### Element Adapter
```javascript
const app = createApp(AttributeBindingApp)
app.use(VueLazyload, {
adapter: {
loaded ({ bindType, el, naturalHeight, naturalWidth, $parent, src, loading, error, Init }) {
// do something here
// example for call LoadedHandler
LoadedHandler(el)
},
loading (listender, Init) {
console.log('loading')
},
error (listender, Init) {
console.log('error')
}
}
})
```
### IntersectionObserver
use [Intersection Observer](https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API) to to improve performance of a large number of nodes.
```javascript
const app = createApp(AttributeBindingApp)
app.use(vueLazy, {
// set observer to true
observer: true,
// optional
observerOptions: {
rootMargin: '0px',
threshold: 0.1
}
})
```
### Lazy Component
```javascript
const app = createApp(AttributeBindingApp)
app.use(VueLazyload, {
lazyComponent: true
});
```
```html
export default {
setup () {
const handler = () => {
console.log('this component is showing')
}
return { handler }
}
}
```
Use in list
```html
```
## Implementation
### Basic
vue-lazyload will set this img element's `src` with `imgUrl` string
```html
import { ref, reactive } from 'vue'
export default {
setup () {
const imgObj = reactive({
src: 'http://xx.com/logo.png',
error: 'http://xx.com/error.png',
loading: 'http://xx.com/loading-spin.svg'
})
const imgUrl = ref('http://xx.com/logo.png') // String
return { imgObj, imgUrl }
}
}
```
### CSS state
There are three states while img loading
`loading` `loaded` `error`
```html
```
```html
img[lazy=loading] {
/*your style here*/
}
img[lazy=error] {
/*your style here*/
}
img[lazy=loaded] {
/*your style here*/
}
/*
or background-image
*/
.yourclass[lazy=loading] {
/*your style here*/
}
.yourclass[lazy=error] {
/*your style here*/
}
.yourclass[lazy=loaded] {
/*your style here*/
}
```
## Methods
### Event Hook
```javascript
import { getCurrentInstance, inject } from 'vue'
export default {
setup() {
const internalInstance = getCurrentInstance().appContext.config.globalProperties
const LazyLoad = internalInstance.$Lazyload
// or
const Lazyload = inject('Lazyload')
Lazyload.$on(event, callback)
Lazyload.$off(event, callback)
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).
#### `Lazyload.$on`
#### Arguments:
* `{string} event`
* `{Function} callback`
#### Example
```javascript
Lazyload.$on('loaded', function ({ bindType, el, naturalHeight, naturalWidth, $parent, src, loading, error }, formCache) {
console.log(el, src)
})
```
#### `Lazyload.$once`
#### Arguments:
* `{string} event`
* `{Function} callback`
#### Example
```javascript
Lazyload.$once('loaded', function ({ el, src }) {
console.log(el, src)
})
```
#### `Lazyload.$off`
If only the event is provided, remove all listeners for that event
#### Arguments:
* `{string} event`
* `{Function} callback`
#### Example
```javascript
import { getCurrentInstance, inject } from 'vue'
export default {
setup() {
const internalInstance = getCurrentInstance().appContext.config.globalProperties
const LazyLoad = internalInstance.$Lazyload
// or
const Lazyload = inject('Lazyload')
const handler = ({ el, src }, formCache) => {
console.log(el, src)
}
Lazyload.$on('loaded', handler)
Lazyload.$off('loaded', handler)
Lazyload.$off('loaded')
}
}
```
### LazyLoadHandler
`Lazyload.lazyLoadHandler`
Manually trigger lazy loading position calculation
#### Example
```javascript
import { getCurrentInstance, inject } from 'vue'
export default {
setup() {
const internalInstance = getCurrentInstance().appContext.config.globalProperties
const LazyLoad = internalInstance.$Lazyload
// or
const Lazyload = inject('Lazyload')
Lazyload.lazyLoadHandler()
}
}
```
### Performance
```javascript
import { getCurrentInstance, inject } from 'vue'
export default {
setup() {
const internalInstance = getCurrentInstance().appContext.config.globalProperties
const LazyLoad = internalInstance.$Lazyload
// or
const Lazyload = inject('Lazyload')
Lazyload.$on('loaded', function (listener) {
console.table(Lazyload.performance())
})
}
}
```
### Dynamic switching pictures
```vue
```
# Authors && Contributors
- [hilongjw](https://github.com/hilongjw)
- [imcvampire](https://github.com/imcvampire)
- [darrynten](https://github.com/darrynten)
- [biluochun](https://github.com/biluochun)
- [whwnow](https://github.com/whwnow)
- [Leopoldthecoder](https://github.com/Leopoldthecoder)
- [michalbcz](https://github.com/michalbcz)
- [blue0728](https://github.com/blue0728)
- [JounQin](https://github.com/JounQin)
- [llissery](https://github.com/llissery)
- [mega667](https://github.com/mega667)
- [RobinCK](https://github.com/RobinCK)
- [GallenHu](https://github.com/GallenHu)
- [Jambon](https://github.com/jambonn)
# License
[The MIT License](http://opensource.org/licenses/MIT)