element-plus/docs/examples/drawer/nested-drawer.vue

<template>
  <el-button type="primary" style="margin-left: 16px" @click="drawer = true">
    open
  </el-button>

  <el-drawer v-model="drawer" title="I'm outer Drawer" size="50%">
    <div>
      <el-button @click="innerDrawer = true">Click me!</el-button>
      <el-drawer
        v-model="innerDrawer"
        title="I'm inner Drawer"
        :append-to-body="true"
        :before-close="handleClose"
      >
        <p>_(:зゝ∠)_</p>
      </el-drawer>
    </div>
  </el-drawer>
</template>

<script lang="ts">
import { defineComponent, ref } from 'vue'
import { ElMessageBox } from 'element-plus'

export default defineComponent({
  setup() {
    const drawer = ref(false)
    const innerDrawer = ref(false)
    const handleClose = (done) => {
      ElMessageBox.confirm('You still have unsaved data, proceed?')
        .then(() => {
          done()
        })
        .catch(() => {
          // catch error
        })
    }
    return {
      drawer,
      innerDrawer,
      handleClose,
    }
  },
})
</script>