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vue3動(dòng)態(tài)加載對(duì)話框的方法實(shí)例

更新時(shí)間：2022年03月29日 15:29:56 作者：程序員德子

對(duì)話框是很常用的組件,在很多地方都會(huì)用到,下面這篇文章主要給大家介紹了關(guān)于vue3動(dòng)態(tài)加載對(duì)話框的相關(guān)資料,文中通過(guò)示例代碼介紹的非常詳細(xì),需要的朋友可以參考下

簡(jiǎn)介

介紹使用vue3的異步組件動(dòng)態(tài)管理對(duì)話框組件，簡(jiǎn)化對(duì)話框組件使用方式。本文使用的是vue3、typescript、element_plus完成的示例。

常規(guī)方式使用對(duì)話框

一般情況下，使用對(duì)話框組件，會(huì)使用v-model進(jìn)行雙向綁定，通過(guò)visible變量控制對(duì)話框的顯示和關(guān)閉。常規(guī)方式有一個(gè)弊端，自定義組件中使用<el-dialog>，需要通過(guò)父組件控制自定義組件是否展示。

<template>
  <ElButton type="primary" @click="openGeneral()">常規(guī)方式打開(kāi)Modal</ElButton>
  <el-dialog
             v-model="dialogVisible"
             title="Tips"
             width="30%"
             :before-close="handleClose"
             >
    <span>This is a message</span>
    <template #footer>
      <span class="dialog-footer">
        <el-button @click="dialogVisible = false">Cancel</el-button>
        <el-button type="primary" @click="dialogVisible = false"
                   >Confirm</el-button
          >
      </span>
    </template>
  </el-dialog>
</template>

<script setup lang="ts">
// This starter template is using Vue 3 <script setup> SFCs
// Check out https://v3.vuejs.org/api/sfc-script-setup.html#sfc-script-setup

import {ref } from 'vue';
const dialogVisible = ref(false)

const openGeneral=()=>{
  dialogVisible.value=true
}

</script>

異步動(dòng)態(tài)加載

先看使用異步組件進(jìn)行動(dòng)態(tài)加載對(duì)話框的方式。異步組件使用到的是defineAsyncComponent接口，只有使用到這個(gè)組件，才會(huì)從網(wǎng)絡(luò)上加載。動(dòng)態(tài)操作使用的useDzModal

使用方式

<template>
  <ElButton type="primary" @click="openTestModalAsync()">動(dòng)態(tài)異步打開(kāi)TestModal</ElButton>
</template>

<script setup lang="ts">
import { defineAsyncComponent,ref } from 'vue';  
import { ElMessageBox } from 'element-plus';
import { useDzModal } from './dzmodal'

// 異步加載組件
const TestModalAsync = defineAsyncComponent(()=>import('./components/TestModal.vue'))

const dzmodal = useDzModal()

// # 通過(guò)dzmodal動(dòng)態(tài)操作對(duì)話框
const openTestModalAsync=()=>{
  dzmodal.open(TestModalAsync,{
    name:'張三'
  })
    .then(res=>{
    if(res.type==='ok'){
      ElMessageBox.alert('TestModal點(diǎn)擊了確定');
    }else{
      ElMessageBox.alert('TestModal點(diǎn)擊了取消');
    }
  })
}

</script>

TestModal.vue

<script setup lang="ts">
  import { reactive, ref, defineProps } from 'vue'
const emits = defineEmits(['ok','cancel'])
const props = defineProps({
  name: String
});
const dialogVisible = ref(true)

const resultData= reactive({
  type:'ok',
  data:{}
})

</script>

<template>
      <el-dialog
v-model="dialogVisible"
title="TestModal"
width="30%"
>
  <div>通過(guò)DzModal打開(kāi)TestModal</div>
<div>外部傳入:{{ name }}</div>
<template #footer>
  <span class="dialog-footer">
    <el-button @click="emits('cancel',{});dialogVisible = false">Cancel</el-button>
<el-button type="primary" @click="emits('ok',{});dialogVisible = false"
>Confirm</el-button
>
  </span>
</template>
</el-dialog>
</template>

<style scoped>
  </style>

使用結(jié)果

動(dòng)態(tài)操作對(duì)話框的實(shí)現(xiàn)

動(dòng)態(tài)操作對(duì)話框，主要思路是動(dòng)態(tài)創(chuàng)建虛擬dom節(jié)點(diǎn)，將對(duì)話框組件渲染到組件上，核心關(guān)鍵點(diǎn)是要?jiǎng)討B(tài)創(chuàng)建的節(jié)點(diǎn)的上下文為當(dāng)前app上下文vm.appContext = this._app._context

DzModalService.ts

import { App, inject, Plugin, h, render} from 'vue'
import { ComponentOptions } from 'vue';
export const DzModalSymbol =  Symbol()
export class DzModalResult{
  type: 'ok'|'cancel'|'string' = 'ok'
  body?:any= undefined
}

export class DzModalService{
    
  private _app?:App=undefined
  constructor(app:App){
      this._app=app;
  }
  public open(modal:ComponentOptions, props?: any):Promise<DzModalResult>{

    return new Promise((reslove,reject)=>{
      if(!this._app){
        reject('_app is undefined')
        return;
      }
      
      const container = document.createElement("div");
      document.body.appendChild(container)
      
      // 這里需要合并props，傳入到組件modal
      const vm = h(modal, {
        ...props,
        onOk:(data?:any)=>{
          // 彈出框關(guān)閉時(shí)移除節(jié)點(diǎn)
          document.body.removeChild(container)
          reslove(this.ok(data));
        },
        onCancel:(data?:any)=>{
          reslove(this.cancel(data));
        }
      });
      // 這里很重要，關(guān)聯(lián)app上下文
      vm.appContext = this._app._context
      render(vm,container);
    });
  }

    
  public ok(data?:any):DzModalResult{
    const result = new DzModalResult();
    result.type='ok';
    result.body=data;
    return result;
  }

  public cancel(data?:any):DzModalResult{
    const result = new DzModalResult();
    result.type='cancel';
    result.body=data;
    return result;
  }
}

export function useDzModal(): DzModalService {
    const dzModal = inject<DzModalService>(DzModalSymbol)
    if(!dzModal){
        throw new Error('No DzModal provided!')
    }
    return dzModal;
}

const plugin: Plugin = {
    install(app:App, options?:{[key:string]:any}){
        const dzModal = new DzModalService(app)
        app.config.globalProperties.$dzModal= dzModal
        app.provide(DzModalSymbol, dzModal)
    }
}

export default plugin;

main.ts

import { createApp } from 'vue'
import App from './App.vue'
import ElementPlus from 'element-plus'
import 'element-plus/dist/index.css'
import DzModal from './dzmodal'
createApp(App)
.use(ElementPlus)
.use(DzModal) // 安裝 dzmodal插件
.mount('#app')

總結(jié)

使用異步動(dòng)態(tài)加載對(duì)話框，父組件無(wú)需控制對(duì)話框組件的visible屬性 , 這樣可以簡(jiǎn)化父組件操作，不在關(guān)心對(duì)話框組件在什么時(shí)間關(guān)閉，如果對(duì)話框組件需要訪問(wèn)網(wǎng)絡(luò)，也在子組件中完成。父組件主要做兩件事：