Building a Reusable Modal with Teleport and Scoped Slots

// components/AppModal.vue
<template>
  <teleport to="body">
    <div v-if="modelValue" class="modal-backdrop" @click.self="closeModal">
      <div class="modal-container">
        <header class="modal-header">
          <slot name="header">Default Header</slot>
          <button class="modal-close-button" @click="closeModal">×</button>
        </header>
        <div class="modal-body">
          <slot :message="'Hello from Modal'">Default Body</slot>
        </div>
        <footer class="modal-footer">
          <slot name="footer"></slot>
          <button @click="closeModal">Close</button>
        </footer>
      </div>
    </div>
  </teleport>
</template>

<script setup>
import { defineProps, defineEmits } from 'vue'

const props = defineProps({
  modelValue: Boolean
})

const emit = defineEmits(['update:modelValue'])

const closeModal = () => {
  emit('update:modelValue', false)
}
</script>

<style scoped>
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}
.modal-container {
  background: white;
  border-radius: 8px;
  padding: 20px;
  min-width: 300px;
  max-width: 80%;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  font-size: 1.2em;
  font-weight: bold;
}
.modal-close-button {
  background: none;
  border: none;
  font-size: 1.5em;
  cursor: pointer;
}
.modal-footer {
  margin-top: 20px;
  text-align: right;
}
</style>

// components/MyPage.vue
<template>
  <div>
    <h1>My Page</h1>
    <button @click="showModal = true">Open Modal</button>
    <AppModal v-model="showModal">
      <template #header><h3>Custom Modal Title</h3></template>
      <template #default="slotProps">
        <p>This is the custom body content for the modal.</p>
        <p>Message from modal: {{ slotProps.message }}</p>
      </template>
      <template #footer>
        <button @click="doSomethingAndClose">Save Changes</button>
      </template>
    </AppModal>
  </div>
</template>

<script setup>
import { ref } from 'vue'
import AppModal from './AppModal.vue'

const showModal = ref(false)

const doSomethingAndClose = () => {
  alert('Saving changes...')
  showModal.value = false
}
</script>