vue3 element-plus el-table表头冻结，表头吸顶

一.使用方式

在main.ts页面创建 vue指令

	import { createSticky } from '@/utils/sticky'const app = createApp(App)createSticky(app)...app.mount('#app');

在el-table标签上使用 v-sticky

<div class="table-box"><!--此处的 .table-box 是会出现滚动条的DOM元素通过document.querySelector选择器进行监听滚动条，如果不传则监听document.querySelector('body')的滚动条--><el-table  v-sticky="{ top: 50, parent: '.table-box'}"        >....</el-table>
<div>

通过以上使用方式，el-table就可以进行吸顶了。

二.脚本文件

复制并保存以下脚本内容到 utils文件夹。

/*** 思路:通过简体 el-table的 thead和tbody父级别区域，进行设置对于的fixed*/function getElParentBySelector(el: any, queryClassSelector: string) {if (!el) {return el}if ([...el.classList].includes(queryClassSelector)) {return el}return getElParentBySelector(el.parentNode, queryClassSelector)
}function getTableShowWidth(thead: string) {const tableBox = getElParentBySelector(thead, 'el-table')return tableBox.getBoundingClientRect().width
}function createTableSticky(el: any, binding: any, vNode?: any) {// 获取表格(element)let thead = el.querySelector('.el-table__header')thead = getElParentBySelector(thead, 'el-table__header-wrapper')const tbody = el.querySelector('.el-table__body')//获取thead 的显示宽度const headerShowWidth = getTableShowWidth(thead)// 获取滚动元素const scrollParent = document.querySelector(binding.value.parent||'body')if (!scrollParent || binding.value.disabled === true) {return}scrollParent.addEventListener('scroll', function () {const stickyTop= binding.value.top||0;const theadHeight = thead.clientHeight// 获取thead距离顶部的距离const theadTop = thead.getBoundingClientRect().topif (theadTop <= stickyTop) {tbody.style.paddingTop = theadHeight + 'px'thead.style.position = 'fixed'thead.style.zIndex = '2021'thead.style.top = stickyTop + 'px'thead.style.borderTop = '1px solid #EBEBEB'//thead.style.width = tbody.offsetWidth + 'px' ////使用最佳显示宽度显示内容，防止有横向滚动条时，固定列显示超出thead.style.width =(tbody.offsetWidth < headerShowWidth ? tbody.offsetWidth : headerShowWidth) + 'px'//获取父级别的宽度，设置列头行只能是负极宽度}// 判断是否需要回归原来位置const originally = tbody.getBoundingClientRect().top// 判断底部距离是否超过表头const goBeyond = tbody.getBoundingClientRect().bottomif (originally > stickyTop || goBeyond <= thead.offsetHeight) {tbody.style.paddingTop = '0'thead.style.position = 'relative'thead.style.zIndex = '0'thead.style.top = 0 + 'px'thead.style.width = tbody.offsetWidth + 'px'thead.style.borderTop = 'none'}})
}export function createSticky(vue: any) {let clearTimeId = 0// el-table表头吸顶效果vue.directive('sticky', {// 当被绑定的元素插入到 DOM 中时……mounted(el: any, binding: any) {//TIP 延时设置，确保表格进行渲染成功！clearTimeId = setTimeout(() => {createTableSticky(el, binding)clearTimeout(clearTimeId)}, 1000)},update(el: any, binding: any) {//TIP 延时设置，确保表格进行渲染成功！clearTimeId = setTimeout(() => {createTableSticky(el, binding)clearTimeout(clearTimeId)}, 1000)},unmounted(el: any, binding: any) {clearTimeId && clearTimeout(clearTimeId)}})
}