Vue3(elementPlus) el-table替换/隐藏行箭头，点击整行展开

一、el-table表格行展开关闭箭头替换成加减号
1、隐藏箭头

::v-deep .el-table__expand-icon .el-icon svg {
  display: none;
}

2、去掉箭头空白，添加替换箭头的图标列
在显示展开内容的列标签中设置width=“1”

<el-table-column type="expand" width="1" >
  <template #default="props">
     <div class="tableItem" :style="{ width: 'calc(100%)'}" >
       <el-table :data="props.row.family">
         <el-table-column type="index" width="70" label="排名" prop="name" align="center"/>
         <el-table-column prop="projectNum" label="项目编号" align="left"/>
          <el-table-column prop="projectName" label="项目名称"  align="left"/>
       </el-table>
     </div>
  </template>
</el-table-column>
 
<el-table-column width="40" align="center" >
   <template #default="scope" >
      <el-icon :size="15" v-if="scope.row.expanded" color="#000000">
         <Minus/>
      </el-icon>
      <el-icon :size="15" v-else color="#000000">
          <Plus/>
      </el-icon>
   </template>
 </el-table-column>

二、点击整行展开数据

const tableData = ref([
  {projectNum:'YCA20241120001',
    id:'5862458213',
    projectName:'项目名称项目名称项目名称',
    month: '2024-10',
    expanded:false,
    family: [
      {
        projectNum:'YCA20241120001',
        projectName:'项目名称项目名称项目名称',
      },{
        projectNum:'YCA20241120001',
        projectName:'项目名称项目名称项目名称',
      }
    ]
  },
  {
    id:'5862456248',
    projectNum:'YCA20241120001',
    projectName:'项目名称项目名称项目名称',
    month: '2024-11',
    expanded:false,
  }
])

使用到el-table的三个属性，含义请看element文档

    row-key="id"

    :expand-row-keys="expands"

    @row-click="clickRowHandle"

<el-table :data="tableData" 
     v-loading="state.loading"  
     @selection-change="selectionChangHandle"
     @sort-change="sortChangeHandle"
     :border="false" 
     style="width: 100%" 
     row-key="id"
     :expand-row-keys="expands"
      @row-click="clickRowHandle">
</el-table>

逻辑代码：

const expands = ref([])
//点击事件
const clickRowHandle = (row: any) => {
 row.expanded=!row.expanded
 if (expands.value.includes(row.id)) {
   expands.value = expands.value.filter(val => val !== row.id)
 }else {
   expands.value.push(row.id)
 }
}

三、外部表格序号和排名序号对齐
设置表格el-table-column的padding-left和magin-left是无效的

解决方法：

:cell-style=“productiontableStyle”

:headerCellStyle=“productiontableStyle”

<el-table-column type="expand" width="1" >
  <template #default="props">
     <div class="tableItem" :style="{ width: 'calc(100%)'}" >
       <el-table :data="props.row.family" :cell-style="productiontableStyle" 
                :headerCellStyle="productiontableStyle">
         <el-table-column type="index" width="70" label="排名" prop="name" align="center"/>
         <el-table-column prop="projectNum" label="项目编号" align="left"/>
          <el-table-column prop="projectName" label="项目名称"  align="left"/>
       </el-table>
     </div>
  </template>
</el-table-column>

逻辑代码：

const productiontableStyle=(column:any) =>{
    if(column.columnIndex === 0) {
        return {'padding-left':'15px'}
    }
}