Vue3中如何用el-select实现触底加载更多功能，用TypeScript编写？

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目录+思路+main.ts+home.vue+思路+使用全局指令来实现底部加载功能+通过+el-select+中的+popper-class+给下拉框添加一个+类名+，在src下的utils文件夹中创建selectLoadMoreDirective.ts文件+import+{Directive,+“}+来引入指令

目录

• 思路
• main.ts
• home.vue

思路

使用全局指令来实现触底加载功能

通过el-select中的popper-class给下拉框加入一个类名

在src下的utils文件夹中创建selectLoadMoreDirective.ts文件

import { Directive, DirectiveBinding } from 'vue' const loadMore: Directive = { beforeMount(el: any, binding: DirectiveBinding) { console.log(el) const selectDom = (document.querySelector(".more_select_dropdown") as any).querySelector(".el-select-dropdown .el-select-dropdown__wrap"); console.log(selectDom, 'selectDom++++++++++++++'); function loadMores(this: any) { const isBase = this.scrollHeight - this.scrollTop <= this.clientHeight if (isBase) { binding.value && binding.value() } } el.selectDomInfo = selectDom el.userLoadMore = loadMores nextTick(() => { selectDom?.addEventListener('scroll', loadMores) }) }, beforeUnmount(el: any) { if (el.userLoadMore) { el.selectDomInfo.removeEventListener('scroll', el.userLoadMore) delete el.selectDomInfo delete el.userLoadMore } } } export default loadMore

main.ts

import { createApp } from 'vue' import App from './App.vue' import router from '/@/router' import loadMore from '@/utils/selectLoadMoreDirective' const app = createApp(App) app.use(router) app.directive('loadMore', loadMore)

home.vue

<template> <div class="p-2"> <el-select v-model="selectedValue" v-loadMore="loadMore" class="more-select" popper-class="more_select_dropdown" @change="selectChange"> <el-option v-for="(item, index) in list" :key="`${item.value}${index}`" :label="item.label" :value="item.value" /> </el-select> </div> </template> <script setup name="Home" lang="ts"> import { ComponentInternalInstance, computed, getCurrentInstance, nextTick, onMounted, reactive, ref, toRefs } from 'vue'; const selectedValue = ref([]) const selectData = reactive({ pageIndex: 1, pageSize: 5, finished: false }) const list = ref([ { value: 1, label: '测试1' }, { value: 2, label: '测试2' }, { value: 3, label: '测试3' }, { value: 4, label: '测试4' }, { value: 5, label: '测试5' }, { value: 6, label: '测试6' }, { value: 7, label: '测试7' }, { value: 8, label: '测试8' }, ]) //触底函数 const loadMore = () => { console.log(' 触底了'); // 防抖处理 setTimeout(() => { if (selectData.finished) return //值为true，则代表没有数据了 selectData.pageIndex += 1 // list.value = list.value.concat(list2.value) for (let i = 1; i <= 8; i++) { list.value.push({ value: i, label: `测试${i}` }) } }, 500) } //选中值发生变化时触发 const selectChange = () => { console.log('选中的xxxx') } </script>

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