vue Element-ui 表格多选 修改选中行背景色

转自：https://www.cnblogs.com/Amerys/p/14688342.html

整体思路方式：

1、给获取到的数据添加自定义的className

2、在点击行(row-click)和手动点击勾选框的事件(select-all)中获取到当前的row的className,直接修改className即可 点击查看事件说明

3、在行的 className 的回调方法中(row-class-name)直接返回className

注：还有另一种方式通过获取row进行循环，判断当前点击row的id或者index与数据的是否相等，然后存放点击后的row到新的数组中，这种方式因为触及到遍历。当我有500行数据或者很多行数据，可想而知这里要遍历多少次，还有另一个就是连续点行的颜色发生变化会有延迟，相对来说性能就不好了。

步骤如下：

1、给数据添加自定义className, 由于这里演示的是本地数据，是直接添加的className; 真实开发是通过接口去加载数据，获取到的数据 直接遍历 赋值就可以，后面就不用管遍历了

data() {
    return {
      tableData: [
        {
          date: "2016-05-03",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
          className: "normal",
        },
        {
          date: "2016-05-02",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
          className: "normal",
        },
        {
          date: "2016-05-04",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
          className: "normal",
        },
        {
          date: "2016-05-01",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
          className: "normal",
        },
        {
          date: "2016-05-08",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
          className: "normal",
        },
        {
          date: "2016-05-06",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
          className: "normal",
        },
        {
          date: "2016-05-07",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
          className: "normal",
        },
      ],
    };

2、点击行和点击勾选框的事件

methods: { 
   // 手动点击勾选框触发的事件
    handleSelect(selection, row) {
      // selection,row  传递两个参数，row直接是对象
      // 只传一个参数得到的是数组
      if (row.className === "normal") {
        row.className = "tableSelectedRowBgColor";
      } else {
        row.className = "normal";
      }
    },

    // select-all 手动点击全选触发的事件
    handleSelectAll(selection) {
      if (selection.length > 0) {
        selection.forEach((item) => {
          if (item.className === "normal") {
            item.className = "tableSelectedRowBgColor";
          }
        });
      } else {
        // 空数组初始化className
        this.tableData.forEach((item) => {
          if (item.className === "tableSelectedRowBgColor") {
            item.className = "normal";
          }
        });
      }
    },

    //点击行触发，切换复选框状态
    handleRowClick(row) {
      this.$refs.multipleTable.toggleRowSelection(row);
      if (row.className === "normal") {
        row.className = "tableSelectedRowBgColor";
      } else {
        row.className = "normal";
      }
    },

}

3、className的回调方法

methods: {
    // 选中背景色
    tableRowClassName({ row }) {
      return row.className;
    },
}

4、最后不要忘了写颜色类名喔

<style>
.tableSelectedRowBgColor td {
  background-color: #fedcbd !important;
}
</style>

完整代码：

<template>
  <el-table
    ref="multipleTable"
    :data="tableData"
    tooltip-effect="dark"
    style="width: 100%"
    @row-click="handleRowClick"
    @select="handleSelect"
    @select-all="handleSelectAll"
    :row-class-name="tableRowClassName"
  >
    <el-table-column type="selection" width="55"> </el-table-column>
    <el-table-column label="日期" width="120">
      <template slot-scope="scope">{{ scope.row.date }}</template>
    </el-table-column>
    <el-table-column prop="name" label="姓名" width="120"> </el-table-column>
    <el-table-column prop="address" label="地址" show-overflow-tooltip>
    </el-table-column>
  </el-table>
</template>

<script>
export default {
  data() {
    return {
      tableData: [
        {
          date: "2016-05-03",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
          className: "normal",
        },
        {
          date: "2016-05-02",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
          className: "normal",
        },
        {
          date: "2016-05-04",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
          className: "normal",
        },
        {
          date: "2016-05-01",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
          className: "normal",
        },
        {
          date: "2016-05-08",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
          className: "normal",
        },
        {
          date: "2016-05-06",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
          className: "normal",
        },
        {
          date: "2016-05-07",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
          className: "normal",
        },
      ],
    };
  },
  methods: {
    // 手动点击勾选框触发的事件
    handleSelect(selection, row) {
      // selection,row  传递两个参数，row直接是对象
      // 只传一个参数得到的是数组
      if (row.className === "normal") {
        row.className = "tableSelectedRowBgColor";
      } else {
        row.className = "normal";
      }
    },

    // select-all 手动点击全选触发的事件
    handleSelectAll(selection) {
      if (selection.length > 0) {
        selection.forEach((item) => {
          if (item.className === "normal") {
            item.className = "tableSelectedRowBgColor";
          }
        });
      } else {
        // 空数组初始化className
        this.tableData.forEach((item) => {
          if (item.className === "tableSelectedRowBgColor") {
            item.className = "normal";
          }
        });
      }
    },

    // 选中背景色
    tableRowClassName({ row }) {
      return row.className;
    },

    //点击行触发，切换复选框状态
    handleRowClick(row) {
      this.$refs.multipleTable.toggleRowSelection(row);
      if (row.className === "normal") {
        row.className = "tableSelectedRowBgColor";
      } else {
        row.className = "normal";
      }
    },
  },
};
</script>

<style>
.tableSelectedRowBgColor td {
  background-color: #fedcbd !important;
}
</style>