Vue3 如何实现一个全局搜索框

效果：点击搜索或者按下ctrl+k键 ，页面就会出现搜索框

搜索框页面（SearchBar.vue）

搜索框的ts   (SearchBar.ts)

封装的搜索框hook (useSearch.ts)

在app.vue中出现搜索框 (App.vue)

1.搜索框页面（SearchBar.vue）(搜索框样式自己写)

<template>
<div id="searchBarWrapper"  ref="searchBarWrapper" class="search"
>
     <div class="searchBox">
          <div class="topChange">
            <div class="botBox">
              <el-input
                v-model="inputLeft"
                class="w-50 m-2"
                :placeholder="placeholderText" >
                
                  <!-- @blur="blurChange" -->
                <template #suffix>
                  <el-icon class="el-input__icon" 
                    ><search
                  /></el-icon>
                </template>
              </el-input>
            </div>
          </div>
        </div>
</div>
</template>

<script lang="ts" setup>
import { defineComponent,nextTick } from 'vue'
nextTick(()=>{
    //自动对焦
    cleanSerachKeyword();
    inmpuModal.value?.focus();
})
</script>

<style>
.search{
    width: 300px;
    height: 40px;
    background-color: aqua;
}
</style>

2.搜索框的ts   (SearchBar.ts)

import { h, render } from "vue"
import SearchBar from "./SearchBar.vue"
export default class SearchBarCreator {
  container: HTMLElement
  appElement: HTMLElement | null
  showing: boolean
  _dismiss: () => void
  constructor() {
    this.container = document.createElement("div")
    this.showing = false
    this.appElement = document.body.querySelector("#app")
    this.present.bind(this)
    this.dismiss.bind(this)
    this._dismiss = this.dismiss.bind(this)
  }

  present() {
    // console.log('进入方法了')
    // const SearchBar2 = h(SearchBar);//虚拟dom生成VNode
    // console.log('1')
    // render(SearchBar2, this.container)//VNode生成真是DOM
    // console.log('2')
    // document.body.insertBefore(this.container, document.body.firstChild)


    if (this.showing) {
      this.dismiss()
    } else {
      const SearchBar2 = h(SearchBar)
      render(SearchBar2, this.container)
      const searchBarWrapperDOM =
        this.container.querySelector("#searchBarWrapper")
      searchBarWrapperDOM?.classList.add("animate-searchInputAnimation")
      document.body.insertBefore(this.container, document.body.firstChild)
      this.showing = true
      this.appElement?.addEventListener("click", this._dismiss)
    }
  }

  dismiss() {
    // if(this.container){
    //     render(null,this.container);
    //     document.body.removeChild(this.container);
    // }

    
    if (this.showing && this.container) {
      render(null, this.container)
      document.body.removeChild(this.container)
      this.showing = false
      this.appElement?.removeEventListener("click", this._dismiss)
    } else {
      console.log("不需要关闭")
    }
  }
}

3.封装的搜索框hook (useSearch.ts)

import SearchBarCreator from "../views/exe/searchBar/searchBar"
  const searchBar=new SearchBarCreator();
function openSearchBar(){
  searchBar.present();
}
function closeSearchBar(){
  searchBar.dismiss();
}
export default{
    openSearchBar,
    closeSearchBar
};

 4.App.vue

<script  lang="ts" setup>
import {
  ref,
  defineComponent,
  getCurrentInstance,
  nextTick,
  onMounted,
  onUpdated,
} from "vue";
import { RouterView } from "vue-router";
import { useRouter } from "vue-router";
import GlobalHeader from "./components/GlobalHeader/index.vue";
import GlobalFooter from "./components/GlobalFooter/index.vue";
import backTop from "./components/backTop/index.vue"
import useSearch from "./hook/useSearch"
const {openSearchBar,closeSearchBar}=useSearch
onMounted(()=>{
  window.addEventListener("keydown",(e)=>{
    if(e.ctrlKey && e.key==="k"){
      //同时按下 ctrl 和 k
      openSearchBar()
    }
  })
})
</script>

<template>
  <RouterView />
  <!-- <div>
    <button @click="openSearchBar">搜索</button>
      <button @click="closeSearchBar">关闭</button>
  </div> -->

</template>
<style scoped>
@keyframes searchInput {
  from{
    transform:translateY(50px);
  }
  to{
    transform: translateY((0px));
  }
}
.searchInput{
  animation: searchInput 1s;
}
 html,body,#app{
  min-height: 100vh;
}
</style>
  

 聚焦输入框：