需求：微信小程序实现固定表头固定列表格组件

功能点

• 排序表格
• 表头可固定
• 首列固定(可以优化成可以配置指定列左侧右侧固定)
• 翻页(上拉加载)监听

效果图

实现思路

• 开始想用三个ScrollView去实现滚动联动，固定表头、列的话，表格内容滚动表头、列也应该对应滚动，写了demo后发现监听一个ScrollView的位置信息去设置另外两个ScrollView的位置真机会很卡，体验极差
• 使用position：sticky; 让表头相对表格顶部sticky，每行的第一个元素相对当前行左侧sticky。
  • 遇到的问题：
    • 表格左滑的时候，滑动一个屏幕后固定列跟着滑出屏幕了。解决方法：动态设置表格的宽度，原理：滑出去的原因是整行滑出屏幕了，而sticky是相对整行左侧定位的。
    • 表格高度设置为100%后useReachBottom上拉监听失效 将表格高度设高的话固定表头就失效了。解决方法：表格用ScrollView套一层使用onScrollToLower监听加载

具体代码

index.tsx

/**
 * 可滑动、固定表头、固定列表格组件
 * @example <Table data={data} dataAttribute={dataAttribute} sortTypeChange={sortTypeChange} handleRow={toDetails}/>
 */

import React, { useState, useMemo, useEffect } from 'react'
import classNames from 'classnames'

// components
import { View, Text, ScrollView } from '@tarojs/components'

// utils
import { noop } from '@/utils/util'

// styles
import styles from './index.module.less'

interface DataAttributeItem {
  title: string
  key: string | number
  sortKey?: string | number
}

interface Props {
  data: Array<any>
  dataAttribute: Array<DataAttributeItem>
  sortTypeChange?: (sort_item_id: any, sort_desc: boolean) => void
  handleRow?: (data: any) => void
  handleScrollToLower?: (e: any) => void
}

export default function Table(props: Props) {
  const { data, dataAttribute, sortTypeChange = noop, handleRow = noop, handleScrollToLower = noop } = props
  const [isSortDesc, setIsSortDesc] = useState<boolean>(true)
  const [sortIndex, setSortIndex] = useState<number>(1)
  const tableWidth = useMemo(() => {
    return `${(dataAttribute.length * 148 + 48)}rpx`
  }, [dataAttribute])

  const tableHeight =  useMemo(() => {
    return `${((data.length + 1) * 96)}rpx`
  }, [data])

  const handleSortItem = (attrItem, attrIndex) => {
    if (attrIndex === 0) {
      return
    }
    const beforeIndex = sortIndex
    const sortKey = attrItem.sortKey
    dataAttribute.map((item, index)=>{
      if (item.sortKey === sortKey) {
        if (beforeIndex === index) {
          setIsSortDesc(!isSortDesc)
        } else {
          setSortIndex(index)
          setIsSortDesc(true)
        }
      }
    })
  }

  useEffect(()=>{
    const sort_desc = isSortDesc
    const sort_item_id = dataAttribute[sortIndex].sortKey
    sortTypeChange(sort_item_id,sort_desc)
  },[sortIndex, isSortDesc])


  return (
    <ScrollView className={styles['table']} scrollY scrollX onScrollToLower={handleScrollToLower}>
      <View className={styles['sticky-box']} style={{height: tableHeight}}>
        <View className={styles['grey-box']} style={{width: tableWidth, position: 'sticky'}}/>
        <View className={styles['table__head']} style={{width: tableWidth, position: 'sticky'}}>
          {dataAttribute.map((attrItem, attrIndex) => (
            <View className={styles['table__head__td']} key={attrIndex} onClick={()=>handleSortItem(attrItem, attrIndex)}>
              <Text
                className={classNames({
                  [styles['table__head__td__text']]: true,
                  [styles['table__head__td__text-active']]: sortIndex === attrIndex,
                })}
                key={attrIndex}
              >{attrItem.title}</Text>
              {attrIndex !== 0 && <View
                className={classNames({
                  [styles['table__head__td__sorter-indicate']]: true,
                  [styles['table__head__td__sorter-indicate--asc-active']]: sortIndex === attrIndex && !isSortDesc,
                  [styles['table__head__td__sorter-indicate--desc-active']]: sortIndex === attrIndex && isSortDesc
                })}
              />}
            </View>
          ))}
        </View>
        {data.map((dataItem, dataIndex) => (
          <View className={styles['table__row']} key={dataIndex} style={{width: tableWidth}} onClick={() => handleRow(dataItem)}>
            {dataAttribute.map((attrItem, attrIndex) => {
              return (
                <Text className={styles['table__row__td']} key={attrIndex}>{dataItem[attrItem.key] || '-'}</Text>
              )
            })}
          </View>
        ))}
      </View>
    </ScrollView>
  )
}
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index.module.less

@import '~@/assets/style/mixins/ellipsis.less';
page{
  font-size: 26rpx;
  line-height: 60rpx;
  color: #222;
  height: 100%;
  width: 100%;
}
.grey-box{
  height: 10rpx;
  top: 0;
  background: #f8f8f8;
  z-index: 100;
}
.table{
  position: relative;
  overflow: scroll;
  width: 100%;
  height: 100%;
  overflow: scroll;
  &__head{
    position: relative;
    height: 96rpx;
    white-space: nowrap;
    // position: sticky;
    top: 10rpx;
    z-index: 100;
    height: 88rpx;
    font-size: 24rpx;
    line-height: 88rpx;
    color: #aaabbd;
    background-color: #f8f8f8;
    border-bottom: 2rpx solid #ecf1f8;
    background-color: #fff;
    white-space: nowrap;
    display: flex;
    &__td{
      .ellipsis();
      width: 148rpx;
      // padding-right: 40rpx;
      display: flex;
      justify-content: flex-start;
      align-items: center;
      background-color: #fff;
      position: relative;
      box-sizing: border-box;
      &:nth-child(1) {
        padding-left: 24rpx;
        width: 154rpx;
        margin-right: 40rpx;
        position: sticky;
        z-index: 10;
        left: 0;
      }
      &__text{
        display: inline;
        &-active{
          color: #6d70ff;
        }
      }
      &__sorter-indicate{
        width: 24rpx;
        height: 24rpx;
        display: inline-block;
        background-repeat: no-repeat;
        background-size: 100% 100%;
        background-image: url('https://icon1.png');
        &--asc-active {
          background-image: url('https://icon2.png');
        }
        &--desc-active {
          background-image: url('https://icon3.png');
        }
      }
    }
  }
  &__row{
    position: relative;
    height: 96rpx;
    white-space: nowrap;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    border-bottom: 2rpx solid #ecf1f8;
    &__td{
      // .ellipsis();
      overflow: scroll;
      white-space: nowrap;
      width: 148rpx;
      // padding-right: 40rpx;
      display: inline-block;
      background-color: #fff;
      position: relative;
      box-sizing: border-box;
      font-size: 26rpx;
      line-height: 96rpx;
      &:nth-child(1) {
        margin-right: 40rpx;
        padding-left: 24rpx;
        width: 154rpx;
        position: sticky;
        z-index: 10;
        left: 0;
      }
    }
  }
}

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