Implementing a Reusable Modal Component with Vue 3 Teleport

// src/components/BaseModal.vue
<template>
  <teleport to="body">
    <transition name="modal-fade">
      <div v-if="isOpen" class="modal-overlay" @click.self="closeModal">
        <div class="modal-container">
          <div class="modal-header">
            <slot name="header">Default Header</slot>
            <button class="modal-close-button" @click="closeModal">&times;</button>
          </div>
          <div class="modal-body">
            <slot>Default Body Content</slot>
          </div>
          <div class="modal-footer">
            <slot name="footer">
              <button @click="closeModal">Close</button>
            </slot>
          </div>
        </div>
      </div>
    </transition>
  </teleport>
</template>

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

const props = defineProps({
  isOpen: {
    type: Boolean,
    default: false,
  },
});

const emit = defineEmits(['update:isOpen']);

const closeModal = () => {
  emit('update:isOpen', false);
};

// Optional: Close modal on Escape key press
watch(() => props.isOpen, (newVal) => {
  if (newVal) {
    document.addEventListener('keydown', handleEscapeKey);
  } else {
    document.removeEventListener('keydown', handleEscapeKey);
  }
}, { immediate: true });

const handleEscapeKey = (e) => {
  if (e.key === 'Escape') {
    closeModal();
  }
};
</script>

<style scoped>
/* Basic Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-container {
  background: white;
  border-radius: 8px;
  padding: 20px;
  min-width: 300px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  position: relative;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  border-bottom: 1px solid #eee;
  padding-bottom: 10px;
}

.modal-close-button {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

.modal-footer {
  margin-top: 20px;
  border-top: 1px solid #eee;
  padding-top: 10px;
  text-align: right;
}

/* Transition Styles */
.modal-fade-enter-active, .modal-fade-leave-active {
  transition: opacity 0.3s ease;
}
.modal-fade-enter-from, .modal-fade-leave-to {
  opacity: 0;
}
</style>

// src/App.vue (example usage)
<template>
  <div>
    <h1>Vue 3 Teleport Modal Example</h1>
    <button @click="isModalOpen = true">Open Modal</button>

    <BaseModal v-model:isOpen="isModalOpen">
      <template #header>
        <h2>Custom Modal Title</h2>
      </template>
      <p>This is the content of my beautiful modal. It uses <strong>Teleport</strong>!</p>
      <template #footer>
        <button @click="isModalOpen = false">Close from Footer</button>
        <button @click="alert('Action performed!')">Perform Action</button>
      </template>
    </BaseModal>
  </div>
</template>

<script setup>
import { ref } from 'vue';
import BaseModal from './components/BaseModal.vue';

const isModalOpen = ref(false);
</script>