4dkankan-components/docs/examples/menu/collapse.vue

<template>
    <el-radio-group v-model="isCollapse" style="margin-bottom: 20px">
        <el-radio-button :label="false">expand</el-radio-button>
        <el-radio-button :label="true">collapse</el-radio-button>
    </el-radio-group>
    <el-menu default-active="2" class="el-menu-vertical-demo" :collapse="isCollapse" @open="handleOpen" @close="handleClose">
        <el-sub-menu index="1">
            <template #title>
                <el-icon><location /></el-icon>
                <span>Navigator One</span>
            </template>
            <el-menu-item-group>
                <template #title><span>Group One</span></template>
                <el-menu-item index="1-1">item one</el-menu-item>
                <el-menu-item index="1-2">item two</el-menu-item>
            </el-menu-item-group>
            <el-menu-item-group title="Group Two">
                <el-menu-item index="1-3">item three</el-menu-item>
            </el-menu-item-group>
            <el-sub-menu index="1-4">
                <template #title><span>item four</span></template>
                <el-menu-item index="1-4-1">item one</el-menu-item>
            </el-sub-menu>
        </el-sub-menu>
        <el-menu-item index="2">
            <el-icon><icon-menu /></el-icon>
            <template #title>Navigator Two</template>
        </el-menu-item>
        <el-menu-item index="3" disabled>
            <el-icon><document /></el-icon>
            <template #title>Navigator Three</template>
        </el-menu-item>
        <el-menu-item index="4">
            <el-icon><setting /></el-icon>
            <template #title>Navigator Four</template>
        </el-menu-item>
    </el-menu>
</template>

<script lang="ts" setup>
import { ref } from 'vue'
import { Document, Menu as IconMenu, Location, Setting } from '@element-plus/icons-vue'

const isCollapse = ref(true)
const handleOpen = (key: string, keyPath: string[]) => {
    console.log(key, keyPath)
}
const handleClose = (key: string, keyPath: string[]) => {
    console.log(key, keyPath)
}
</script>

<style>
.el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
}
</style>