Explanation of Vue3 Encapsulation Message Message Prompt Instance Function

Directory Vue3 Encapsulation Message Prompt Instance Function Style Layout Encapsulation message. vue Function Implementation message. js Registration Custom Instruction Use: Summary

Vue3 Encapsulation Message Prompt Instance Function

Vue 2.0 uses Vue.prototype.$message = function () {} vue 3.0 uses app. config. globalProperties to mount the prototype method app.config.globalProperties.$message = Message Direct import functions are also supported using import Message from './Message. js

Style layout encapsulation message. vue

<template>
  <Transition name="down">
    <div class="my-message" :style="style[type]" v-show='isShow'>
      <!--  The style is bound above  -->
      <!--  Different prompt icons will change  -->
      <i class="iconfont" :class="[style[type].icon]"></i>
      <span class="text">{{text}}</span>
    </div>
  </Transition>
</template>
<script>
import { onMounted, ref } from 'vue'
export default {
  name: 'myMessage',
  props: {
    text: {
      type: String,
      default: ''
    },
    type: {
      type: String,
      // warn  Warning   error  Errors   success  Success 
      default: 'warn'
    }
  },
  setup () {
    //  Definition 1 Objects containing 3 Styles, objects in this case key Is the type string 
    const style = {
      warn: {
        icon: 'icon-warning',
        color: '#E6A23C',
        backgroundColor: 'rgb(253, 246, 236)',
        borderColor: 'rgb(250, 236, 216)'
      },
      error: {
        icon: 'icon-shanchu',
        color: '#F56C6C',
        backgroundColor: 'rgb(254, 240, 240)',
        borderColor: 'rgb(253, 226, 226)'
      },
      success: {
        icon: 'icon-queren2',
        color: '#67C23A',
        backgroundColor: 'rgb(240, 249, 235)',
        borderColor: 'rgb(225, 243, 216)'
      }
    }
    //  Control animation 
    const isShow = ref(false)
    //  Triggered after the component template is rendered successfully 
    onMounted(() => {
      isShow.value = true
    })
    return { style, isShow }
  }
}
</script>
<style scoped lang="less">
.down {
  &-enter {
    &-from {
      transform: translate3d(0, -75px, 0);
      opacity: 0;
    }
    &-active {
      transition: all 0.5s;
    }
    &-to {
      transform: none;
      opacity: 1;
    }
  }
}
.my-message {
  width: 300px;
  height: 50px;
  position: fixed;
  z-index: 9999;
  left: 50%;
  margin-left: -150px;
  top: 25px;
  line-height: 50px;
  padding: 0 25px;
  border: 1px solid #e4e4e4;
  background: #f5f5f5;
  color: #999;
  border-radius: 4px;
  i {
    margin-right: 4px;
    vertical-align: middle;
  }
  .text {
    vertical-align: middle;
  }
}
</style>

Function implementation message. js

// Icons 
//  Text 
import { createVNode,render } from 'vue'
import myMessage from './message.vue'
//  Dynamic creation 1 A DOM Container 
const div=document.createElement('div')
div.setAttribute('class','my-message-container')
document.body.appendChild(div)
export default ({text,type})=>{
  let timer=null
  //createVNode  Used to create 1 Virtual nodes 
  //  Parameter 1  Support component 
  //  Parameter 2  Represents the options passed to the component 
const vnode= createVNode(myMessage,{text, type})
// Render the virtual node to the page's DOM Can be medium 
// render Parameters of the function 
// Parameter 1 Represents the content that needs to be rendered (virtual nodes) 
//  Parameter 2 Represents the target location for rendering   ( DOM Element) 
   render(vnode,div)
 //  Hope 1s Post-disappearance 
  clearTimeout(timer)
   timer=setTimeout(()=>{
     //  Empty div What's inside 
      render(null,div)
   },1000)
}
// $message({ text: ' Login failed ', type: 'error'})

Register custom directives

import Message from './Message.js'
export default {
  install(app){
  //  If you want to mount global properties, properties that can be called through component instances  this.$message
     //  Expand 1 Instance method 
      app.config.globalProperties.$message = Message //  Prototype function 
  }
}

Use:

Method 1

import Message from './message.js'
setup(){
  Message({ text: ' Login failed ', type: 'error' })
}

Method 2

// setup Access the component instance object in the function  
    import { getCurrentInstance } from 'vue'
   setup(){
     const instance= getCurrentInstance()
     instance.proxy.$message({ text: ' Login failed ', type: 'error' })
   } 

Method 3 this. $message

this.$message({ text: ' Login failed ', type: 'error' })

Summarize

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