vue3+el-select实现触底加载更多功能(ts版)

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

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