一、效果

二、代码

1.代码可直接复制使用

<template>
  <div class="page-view" @click="handleClickOutside">
    <el-button @click="resetFilters">Reset Filters</el-button>
    <el-table ref="tableRef" row-key="date" :data="filteredData" style="width: 100%">
      <el-table-column prop="date" label="Date" sortable width="180" column-key="date" />
      <el-table-column prop="name" label="Name" sortable width="180">
        <template #header>
          <div style="display: inline-block; align-items: center;">
            <span>Name</span>
            <el-icon ref="buttonRef" @click.stop="toggleNameFilter(buttonRef, 'nameFilter')"
              style="cursor: pointer; margin-left: 10px;"
              :style="{ color: searchDate.nameFilter ? '#007d7b' : '#85888e' }">
              <Filter />
            </el-icon>
          </div>
        </template>
        <template #default="scope">
          <span>{{ scope.row.name }}---</span>
        </template>
      </el-table-column>
      <el-table-column prop="address" label="Address" width="300" />
      <el-table-column prop="tag" label="Tag">
        <template #header>
          <div style="display: inline-block; align-items: center;">
            <span>Tag</span>
            <el-icon ref="buttonRef2" @click.stop="toggleNameFilter(buttonRef2, 'tagFilter')"
              style="cursor: pointer; margin-left: 10px;"
              :style="{ color: searchDate.tagFilter ? '#007d7b' : '#85888e' }">
              <Filter />
            </el-icon>
          </div>
        </template>
        <template #default="scope">
          <el-tag :type="scope.row.tag === 'Home' ? 'primary' : 'success'">{{ scope.row.tag }}</el-tag>
        </template>
      </el-table-column>
    </el-table>
    {{ visible }}
    <pre>{{ searchDate }}</pre>
    <el-popover :visible="visible" :virtual-ref="refName" placement="bottom" :width="'fit-content'">
      <div>
        <el-input v-if="showKey === 'nameFilter'" v-model="searchDate.nameFilter" placeholder="输入框"
          @input="applyNameFilter" clearable style="margin-top: 10px; width: 150px;" />
        <el-select v-if="showKey === 'tagFilter'" v-model="searchDate.tagFilter" placeholder="Select Tag"
          @change="applyTagFilter" clearable style="margin-top: 10px; width: 150px;">
          <el-option label="Home" value="Home" />
          <el-option label="Office" value="Office" />
        </el-select>
        <div class="mt" style="text-align: right;">
          <el-button type="info" link @click="cancelFilter">重置</el-button>
          <el-button type="primary" link @click="searchFilter">筛选</el-button>
        </div>
      </div>
    </el-popover>
  </div>
</template>

<script setup>
import { ref, computed, unref } from 'vue'
// import { ElIconSearch, ElIconSArrowDown } from '@element-plus/icons-vue'
import { Filter } from '@element-plus/icons-vue'

import { ClickOutside as vClickOutside } from 'element-plus'
const buttonRef = ref()
const buttonRef2 = ref()
const popoverRef = ref()
const onClickOutside = () => {
  console.log(123);

  if (unref(popoverRef) && unref(popoverRef).popperRef) {
    unref(popoverRef).popperRef?.delayHide?.()
  }
}

const showKey = ref(undefined) // 当前展示哪个筛选窗
const visible = ref(false) // 手动控制筛选窗显隐
const refName = ref(null) // 动态绑定在哪个表头图标下

const tableRef = ref() // 表格ref
const searchDate = ref({
  nameFilter: undefined,
  tagFilter: undefined,
}) // 查询参数


// 全局重置
const resetFilters = () => {
  searchDate.value.nameFilter = undefined
  searchDate.value.tagFilter = undefined
  applyNameFilter()
  applyTagFilter()

  getData()
}

// 触发筛选
const toggleNameFilter = (ref, key) => {
  if (showKey.value !== key) {
    visible.value = false
    getData()
  }
  refName.value = ref
  showKey.value = key
  visible.value = !visible.value
}

// 点击其他元素
const handleClickOutside = () => {
  // visible.value = false;
};

// 重置
const cancelFilter = () => {
  searchDate.value[showKey.value] = undefined
  visible.value = false;
  getData()
}
// 筛选
const searchFilter = () => {
  visible.value = false;
  getData()
}

// 单独过滤
const applyNameFilter = () => {
  // Filtering logic can be customized if needed
}
const applyTagFilter = () => {
  // Filtering logic can be customized if needed
}

// 原数据
const tableData = [
  {
    date: '2016-05-03',
    name: 'Tom',
    address: 'No. 189, Grove St, Los Angeles',
    tag: 'Home',
  },
  {
    date: '2016-05-02',
    name: 'Tom',
    address: 'No. 189, Grove St, Los Angeles',
    tag: 'Office',
  },
  {
    date: '2016-05-04',
    name: 'Tom',
    address: 'No. 189, Grove St, Los Angeles',
    tag: 'Home',
  },
  {
    date: '2016-05-01',
    name: 'Jack',
    address: 'No. 189, Grove St, Los Angeles',
    tag: 'Office',
  },
]

// 列表显示的数据
// const filteredData = computed(() => {
//   return tableData.filter((item) => {
//     const nameMatch = searchDate.value.nameFilter ? item.name.toLowerCase().includes(searchDate.value.nameFilter.toLowerCase()) : true
//     const tagMatch = searchDate.value.tagFilter ? item.tag === searchDate.value.tagFilter : true
//     return nameMatch && tagMatch
//   })
// })
const filteredData = ref(JSON.parse(JSON.stringify(tableData)))
// 获取数据
const getData = () => {
  filteredData.value = tableData.filter((item) => {
    const nameMatch = searchDate.value.nameFilter ? item.name.toLowerCase().includes(searchDate.value.nameFilter.toLowerCase()) : true
    const tagMatch = searchDate.value.tagFilter ? item.tag === searchDate.value.tagFilter : true
    return nameMatch && tagMatch
  })
}
</script>

<style lang="scss" scoped>
:deep(.el-popover) {
  width: fit-content !important;
}

:deep(.el-popover.el-popper) {
  width: fit-content !important;
}
</style>

三、问题

1.使用el-popover完成筛选框

同时通过:visible="visible"来控制筛选框显隐，但是在el-popover下就不能使用<template #reference>子元素 （如使用子元素，就没法将筛选框其定位到每个表头；除非你给每一个表头的el-icon图表外都写一个el-popover来包裹，那样10个表头需要写10个el-popover）。所以控制台会报警告提示：

ElementPlusError: [ElOnlyChild] no valid child node found at debugWarn (chunk-32EVVALS.js?v=a0ab03ed:9136:37)

暂无好的解决办法，大家有方案可提供下。

——————————————————————————————————————————————————
更新： 我直接把el-table也给进行了封装，动态遍历渲染表格（也就动态渲染了表头，也就可以给表头el-icon图标外包裹一个el-popover来实现各个表头的筛选，且不会报告警报错）