el-table两个表尾合计行联动同步滚动条代码

问题描述

最近产品提出一个需求，说是做表格呈现统计数据，不过数据源是来自两个地方的，所以需要做两个表格去呈现数据，同时在表格最后统计数据。

效果图

我们先看一下效果图

思路

获取对应的两个表格设置滚动条的dom，并通过Element.scrollLeft去设置滚动的距离

官方文档：https://developer.mozilla.org/zh-CN/docs/Web/API/Element/scrollLeft

滚动容器（审查元素即可得知）：

完整代码

自己演示的话，直接复制粘贴即可，代码中包含注释

<template>
  <div class="kkk">
    <div class="myWrap">
      <el-table
        ref="one"
        :data="tableBody"
        border
        :header-cell-style="{
          background: '#FAFAFA',
          color: '#333333',
          fontWeight: 'bold',
          fontSize: '14px',
        }"
        show-summary
      >
        <el-table-column type="index" label="序号" width="60">
        </el-table-column>
        <el-table-column
          prop="bookType"
          label="人物隶属"
          width="100"
        ></el-table-column>
        <el-table-column prop="name" label="姓名" width="120"></el-table-column>
        <el-table-column prop="zhifubao" label="支付宝" width="160">
        </el-table-column>
        <el-table-column prop="weixin" label="微信" width="160">
        </el-table-column>
        <el-table-column prop="jingdong" label="京东" width="160">
        </el-table-column>
        <el-table-column prop="yunshanfu" label="云闪付" width="160">
        </el-table-column>
        <el-table-column prop="suning" label="苏宁" width="160">
        </el-table-column>
        <el-table-column prop="lakala" label="拉卡拉" width="160">
        </el-table-column>
      </el-table>
      <el-table
        ref="two"
        :data="tableBody2"
        border
        show-summary
        :show-header="false"
      >
        <el-table-column type="index" label="序号" width="60">
        </el-table-column>
        <el-table-column
          prop="bookType"
          label="业务类型"
          width="100"
        ></el-table-column>
        <el-table-column prop="name" label="姓名" width="120"></el-table-column>
        <el-table-column prop="zhifubao" label="支付宝" width="160">
        </el-table-column>
        <el-table-column prop="weixin" label="微信" width="160">
        </el-table-column>
        <el-table-column prop="jingdong" label="京东" width="160">
        </el-table-column>
        <el-table-column prop="yunshanfu" label="云闪付" width="160">
        </el-table-column>
        <el-table-column prop="suning" label="苏宁" width="160">
        </el-table-column>
        <el-table-column prop="lakala" label="拉卡拉" width="160">
        </el-table-column>
      </el-table>
    </div>
  </div>
</template>
<script>
// cnpm i lodash --save
import _ from "lodash";
export default {
  data() {
    return {
      tableBody: [
        {
          bookType: "西游记",
          name: "孙悟空",
          zhifubao: 1,
          weixin: 2,
          jingdong: 3,
          yunshanfu: 4,
          suning: 5,
          lakala: 6,
        },
        {
          bookType: "西游记",
          name: "猪八戒",
          zhifubao: 6,
          weixin: 5,
          jingdong: 4,
          yunshanfu: 3,
          suning: 2,
          lakala: 1,
        },
      ],
      tableBody2: [
        {
          bookType: "三国演义",
          name: "刘备",
          zhifubao: 2,
          weixin: 2,
          jingdong: 2,
          yunshanfu: 2,
          suning: 2,
          lakala: 2,
        },
        {
          bookType: "三国演义",
          name: "猪八戒",
          zhifubao: 3,
          weixin: 3,
          jingdong: 3,
          yunshanfu: 3,
          suning: 3,
          lakala: 3,
        },
      ],
    };
  },
  mounted() {
    // 1. 初始化的时候，设置横向滚动规则
    this.setScrollRule();
  },
  methods: {
    setScrollRule() {
      let that = this; // 存一份this便于取用
      this.one = this.$refs.one.bodyWrapper; // 获取带有滚动条的dom元素，注意饿了么UI的el-table的横向滚动条是设置在类名为
      this.two = this.$refs.two.bodyWrapper; // class="el-table__body-wrapper is-scrolling-left" 这个dom上。审查元素可知
      console.log("滚动条dom容器", this.one);
      // 2. 绑定滚动事件，顺带加上一个节流函数吧，也算是性能优化
      this.one.addEventListener(
        "scroll",
        _.throttle(
          function () {
            that.fn1(); // 85毫秒触发一次吧
          },
          85,
          {
            leading: true, //指定调用在节流开始前
            trailing: false, //指定调用在节流结束后,
          }
        )
      );
      // 同上...
      this.two.addEventListener(
        "scroll",
        _.throttle(
          function () {
            that.fn2();
          },
          85,
          {
            leading: true,
            trailing: false,
          }
        )
      );
    },
    // 3. 通过Element.scrollLeft属性 可以读取或设置元素滚动条到元素左边的距离
    fn1() {
      console.log("滚动条一 移动多少？", this.one.scrollLeft);
      this.two.scrollLeft = this.one.scrollLeft;
      /**
       * 加了节流函数以后，就会出现当我们滑动过快的时候，远小于定义节流时间所触发的间隔
       * 就会出现距离不准确问题，所以再加一个延时定时器重新更正（更新一下位置）
       * */
      setTimeout(() => {
        this.two.scrollLeft = this.one.scrollLeft; // api文档详情见mdn文档：https://developer.mozilla.org/zh-CN/docs/Web/API/Element/scrollLeft
      }, 120);
    },
    // 同上...
    fn2() {
      console.log("滚动条二 移动多少？", this.two.scrollLeft);
      this.one.scrollLeft = this.two.scrollLeft;
      setTimeout(() => {
        this.one.scrollLeft = this.two.scrollLeft;
      }, 120);
    },
  },
  beforeDestroy() {
    // 移除事件监听
    this.one.removeEventListener("scroll", this.fn1);
    this.one.removeEventListener("scroll", this.fn2);
  },
};
</script>

好记性不如烂笔头，记录一下吧 ^_^