el-dropdown-menu指令事件的使用方法

el-dropdown-menu（Dropdown 下拉菜单）中command指令事件的使用

官网的使用方法：点击菜单项后会触发事件，用户可以通过相应的菜单项 key 进行不同的操作。

<template>
  <el-dropdown @command="handleCommand">
    <span class="el-dropdown-link">
      Dropdown List<el-icon class="el-icon--right"><arrow-down /></el-icon>
    </span>
    <template #dropdown>
      <el-dropdown-menu>
        <el-dropdown-item command="a">Action 1</el-dropdown-item>
        <el-dropdown-item command="b">Action 2</el-dropdown-item>
        <el-dropdown-item command="c">Action 3</el-dropdown-item>
        <el-dropdown-item command="d" disabled>Action 4</el-dropdown-item>
        <el-dropdown-item command="e" divided>Action 5</el-dropdown-item>
      </el-dropdown-menu>
    </template>
  </el-dropdown>
</template>

<script lang="ts" setup>
import { ElMessage } from 'element-plus'
import { ArrowDown } from '@element-plus/icons-vue'

const handleCommand = (command: string | number | object) => {
  ElMessage(`click on item ${command}`)
}
</script>
<style scoped>
.example-showcase .el-dropdown-link {
  cursor: pointer;
  color: var(--el-color-primary);
  display: flex;
  align-items: center;
}
</style>

结合el-table使用，将表格的某一样数据传入到command指令中

集合el-table使用，将表格的某一行数据通过点击对应的按钮传入到对应的指令事件中，使@command可以传两个参数，一个是command指令，一个是表格当前行的数据

<template>
  <div>
    <el-table :data="tableData">
      <el-table-column prop="name" label="姓名" />
      <el-table-column prop="age" label="年龄" />
      <el-table-column width="225" label="操作">
        <template #default="scope">
          <el-button size="small" type="primary" plain @click="handleEdit(scope.row.id)">修改</el-button>
          <el-button size="small" type="danger" plain @click="handleDelete(scope.row.id)">删除</el-button>
          <!-- 这里相当于，是使用官方的方法，得到一个函数，返回一个函数，包含command和scope.row的参数 -->
          <el-dropdown style="margin-left: 15px"
            @command="(command: string | number | object) => handleCommand(command, scope.row)">
            <el-button size="small" type="primary" plain>》更多</el-button>
            <template #dropdown>
              <el-dropdown-menu>
                <el-dropdown-item command="handleMenuList">分配权限</el-dropdown-item>
              </el-dropdown-menu>
            </template>
          </el-dropdown>
        </template>
      </el-table-column>
    </el-table>
  </div>
</template>

<script setup lang="ts">
import { ref } from 'vue';

const tableData = ref([
  {
    id: 1,
    name: '张三',
    age: 23
  }, 
  {
    id: 2,
    name: '李四',
    age: 24
  },
  {
    id: 3,
    name: '王五',
    age: 23
  }
])

const handleCommand = (command: string | number | object, row: any) => {
  console.log("command的命令是")
  console.log(command)
  console.log("===============================")
  if (command === 'handleMenuList') {
    console.log(command)
  }
  console.log("==========================")
  console.log("表格传入的一行数据是")
  console.log(row)
}

const handleEdit = (id: any) => {
  console.log(id)
}

const handleDelete = (id: any) => {
  console.log(id)
}

</script>

<style scoped></style>

表格界面如下所示：

由于Dropdown 下拉菜单中下拉选项Action 1中的command可以传(command: string | number | object）多种类型的数据，所以这里试着传object类型的数据

<template>
  <div>
    <el-table :data="tableData">
      <el-table-column prop="name" label="姓名" />
      <el-table-column prop="age" label="年龄" />
      <el-table-column width="225" label="操作">
        <template #default="scope">
          <el-button size="small" type="primary" plain @click="handleEdit(scope.row.id)">修改</el-button>
          <el-button size="small" type="danger" plain @click="handleDelete(scope.row.id)">删除</el-button>
          <!-- 这里相当于，是使用官方的方法，得到一个函数，返回一个函数，包含command和scope.row的参数 -->
          <el-dropdown style="margin-left: 15px"
            @command="(command: string | number | object) => handleCommand(command, scope.row)">
            <el-button size="small" type="primary" plain>》更多</el-button>
            <template #dropdown>
              <el-dropdown-menu>
                <!-- 记得加冒号： -->
                <!-- <el-dropdown-item :command="{nmae: 'aaa', age: 24}" >分配权限</el-dropdown-item> -->
                <el-dropdown-item :command="item" v-for="item in dropdownItemList" :key="item.menuId">{{ item.menuName }}</el-dropdown-item>
              </el-dropdown-menu>
            </template>
          </el-dropdown>
        </template>
      </el-table-column>
    </el-table>
  </div>
</template>

<script setup lang="ts">
import { ref } from 'vue';

const tableData = ref([
  {
    id: 1,
    name: '张三',
    age: 23
  }, 
  {
    id: 2,
    name: '李四',
    age: 24
  },
  {
    id: 3,
    name: '王五',
    age: 23
  }
])

const dropdownItemList = ref([
  {
    menuId: 555,
    menuName: "下拉菜单11111111",
    path: '路径1111111'
  },
  {
    menuId: 6666,
    menuName: "下拉菜单22222222",
    path: '路径1'
  },
  {
    menuId: 7777,
    menuName: "下拉菜单333333",
    path: '路径3333333'
  },{
    menuId: 8888,
    menuName: "下拉菜单4444",
    path: '路径4444444'
  }

])

const handleCommand = (command: string | number | object, row: any) => {
 console.log("command的数据是：")
 console.log(command)
 console.log("表格传入的行数据是：")
 console.log(row)
}

const handleEdit = (id: any) => {
  console.log(id)
}

const handleDelete = (id: any) => {
  console.log(id)
}

</script>

<style scoped></style>