element-plus/docs/examples/dropdown/dropdown-methods.vue

<template>
  <div style="font-size: 14px">
    <p>open(close) the Dropdown list2 will close(open) the Dropdown List1.</p>
  </div>
  <div style="margin: 15px">
    <el-button @click="showClick">show</el-button>
  </div>
  <el-dropdown ref="dropdown1" trigger="contextmenu" style="margin-right: 30px">
    <span class="el-dropdown-link"> Dropdown List1 </span>
    <template #dropdown>
      <el-dropdown-menu>
        <el-dropdown-item>Action 1</el-dropdown-item>
        <el-dropdown-item>Action 2</el-dropdown-item>
        <el-dropdown-item>Action 3</el-dropdown-item>
        <el-dropdown-item disabled>Action 4</el-dropdown-item>
        <el-dropdown-item divided>Action 5</el-dropdown-item>
      </el-dropdown-menu>
    </template>
  </el-dropdown>

  <el-dropdown trigger="contextmenu" @visible-change="handleVisible2">
    <span class="el-dropdown-link"> Dropdown List2 </span>
    <template #dropdown>
      <el-dropdown-menu>
        <el-dropdown-item>Action 1</el-dropdown-item>
        <el-dropdown-item>Action 2</el-dropdown-item>
        <el-dropdown-item>Action 3</el-dropdown-item>
        <el-dropdown-item disabled>Action 4</el-dropdown-item>
        <el-dropdown-item divided>Action 5</el-dropdown-item>
      </el-dropdown-menu>
    </template>
  </el-dropdown>
</template>

<script setup lang="ts">
import { ref } from 'vue'
const dropdown1 = ref()
function handleVisible2(visible: any) {
  if (visible) {
    dropdown1.value.handleClose()
  } else {
    dropdown1.value.handleOpen()
  }
}
function showClick() {
  dropdown1.value.handleOpen()
}
</script>