vue3动态加载对话框的方法实例

来源：jb51　　时间：2022/3/29 16:18:11　　对本文有异议

简介

介绍使用vue3的异步组件动态管理对话框组件，简化对话框组件使用方式。本文使用的是vue3、typescript、element_plus完成的示例。

常规方式使用对话框

一般情况下，使用对话框组件，会使用v-model进行双向绑定，通过visible变量控制对话框的显示和关闭。常规方式有一个弊端，自定义组件中使用<el-dialog>，需要通过父组件控制自定义组件是否展示。

<template>
  <ElButton type="primary" @click="openGeneral()">常规方式打开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>

异步动态加载

先看使用异步组件进行动态加载对话框的方式。异步组件使用到的是defineAsyncComponent接口，只有使用到这个组件，才会从网络上加载。动态操作使用的useDzModal

使用方式

<template>
  <ElButton type="primary" @click="openTestModalAsync()">动态异步打开TestModal</ElButton>
</template>

<script setup lang="ts">
import { defineAsyncComponent,ref } from 'vue';  
import { ElMessageBox } from 'element-plus';
import { useDzModal } from './dzmodal'
 
// 异步加载组件
const TestModalAsync = defineAsyncComponent(()=>import('./components/TestModal.vue'))
 
const dzmodal = useDzModal()
 
// # 通过dzmodal动态操作对话框
const openTestModalAsync=()=>{
  dzmodal.open(TestModalAsync,{
    name:'张三'
  })
    .then(res=>{
    if(res.type==='ok'){
      ElMessageBox.alert('TestModal点击了确定');
    }else{
      ElMessageBox.alert('TestModal点击了取消');
    }
  })
}
 
</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>通过DzModal打开TestModal</div>
<div>外部传入:{{ 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>

使用结果

动态操作对话框的实现

动态操作对话框，主要思路是动态创建虚拟dom节点，将对话框组件渲染到组件上，核心关键点是要动态创建的节点的上下文为当前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)
      
      // 这里需要合并props，传入到组件modal
      const vm = h(modal, {
        ...props,
        onOk:(data?:any)=>{
          // 弹出框关闭时移除节点
          document.body.removeChild(container)
          reslove(this.ok(data));
        },
        onCancel:(data?:any)=>{
          reslove(this.cancel(data));
        }
      });
      // 这里很重要，关联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) // 安装 dzmodal插件
.mount('#app')