这是我参与新手入门的第2篇文章

前言

在项目中，遇到多选框表格数据，但是element-ui组件库，默认标题内容是多选框样式，很可能项目中需要自定义标题内容，如何实现呢？

官方代码如下：

<template>
    <div>
          <el-table
            ref="multipleTable"
            :data="tableData"
            tooltip-effect="dark"
            style="width: 100%"
            @selection-change="handleSelectionChange">
            <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>
        <div style="margin-top: 20px">
            <el-button @click="toggleSelection([tableData[1], tableData[2]])">切换第二、第三行的选中状态</el-button>
            <el-button @click="toggleSelection()">取消选择</el-button>
        </div>
    </div>
</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'
      }, {
        date: '2016-05-02',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1518 弄'
      }, {
        date: '2016-05-04',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1518 弄'
      }, {
        date: '2016-05-01',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1518 弄'
      }, {
        date: '2016-05-08',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1518 弄'
      }, {
        date: '2016-05-06',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1518 弄'
      }, {
        date: '2016-05-07',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1518 弄'
      }],
      multipleSelection: []
    }
  },

  methods: {
    toggleSelection (rows) {
      if (rows) {
        rows.forEach(row => {
          this.$refs.multipleTable.toggleRowSelection(row)
        })
      } else {
        this.$refs.multipleTable.clearSelection()
      }
    },
    handleSelectionChange (val) {
      this.multipleSelection = val
    }
  }
}
</script>
<style scoped>

</style>

复制代码

更改思路：

elementUI之通过指定 Table 组件的 row-class-name 属性来为 Table 中的某一行添加 class改变该行的颜色等样式。
1.隐藏默认 多选框 样式
2.利用伪元素，将内容定位到图标位置即可
(注意点：因为是更改封装组件样式，所以需要用到深度作用选择器，本文用的/deep/)
复制代码

话不多说，直接上代码：

<template>
    <div class="main">
        <el-table
            ref="multipleTable"
            :data="tableData"
            tooltip-effect="dark"
            style="width: 100%"
            @selection-change="handleSelectionChange"
            >
            <el-table-column
            type="selection"
            label-class-name="DisabledSelection"
            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>
        <div style="margin-top: 20px">
            <el-button @click="toggleSelection([tableData[1], tableData[2]])">切换第二、第三行的选中状态</el-button>
            <el-button @click="toggleSelection()">取消选择</el-button>
        </div>
    </div>
</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'
      }, {
        date: '2016-05-02',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1518 弄'
      }, {
        date: '2016-05-04',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1518 弄'
      }, {
        date: '2016-05-01',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1518 弄'
      }, {
        date: '2016-05-08',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1518 弄'
      }, {
        date: '2016-05-06',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1518 弄'
      }, {
        date: '2016-05-07',
        name: '王小虎',
        address: '上海市普陀区金沙江路 1518 弄'
      }],
      multipleSelection: []
    }
  },

  methods: {
    toggleSelection (rows) {
      if (rows) {
        rows.forEach(row => {
          this.$refs.multipleTable.toggleRowSelection(row)
        })
      } else {
        this.$refs.multipleTable.clearSelection()
      }
    },
    handleSelectionChange (val) {
      this.multipleSelection = val
    }
  }
}
</script>
<style lang="less" scoped>
    div.main {
        //关键样式 修改内容
        .el-table /deep/ .DisabledSelection .cell .el-checkbox__inner {
            display: none;
            position: relative;
        }
        .el-table /deep/ .DisabledSelection .cell:before {
            content: '选择';
            position: absolute;
            right: 20px;
        }
    }
</style>

复制代码

复制下 代码，就可以看到效果了，小伙伴们觉得怎么样呢？