/vue-best-practices

Teleport Component Best Practices

Impact: MEDIUM - <Teleport> renders part of a component's template in a different place in the DOM while preserving the Vue component hierarchy. Use it for overlays (modals, toasts, tooltips) or any UI that must escape stacking contexts, overflow, or fixed positioning constraints.

Task List

• Teleport overlays to body or a dedicated container outside the app root
• Keep a shared target for similar UI (#modals, #notifications) and control layering with order or z-index
• Use :disabled for responsive layouts that should render inline on small screens
• Remember props, emits, and provide/inject still work through teleport
• Avoid relying on parent stacking contexts or transforms for teleported UI

Teleport Overlays Out of Transformed Containers

When an ancestor has transform, filter, or perspective, fixed-position overlays can behave like they are locally positioned. Teleport escapes that context.

BAD:

<template>
  <div class="animated-container">
    <button @click="open = true">Open</button>

    <!-- Broken: fixed positioning is scoped to the transformed parent -->
    <div v-if="open" class="modal">Modal</div>
  </div>
</template>

<style>
.animated-container {
  transform: translateZ(0);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
}
</style>

GOOD:

<template>
  <div class="animated-container">
    <button @click="open = true">Open</button>

    <Teleport to="body">
      <div v-if="open" class="modal">Modal</div>
    </Teleport>
  </div>
</template>

Responsive Layouts with disabled

Use :disabled to render inline on mobile and teleport on larger screens:

<script setup>
import { useMediaQuery } from '@vueuse/core'

const isMobile = useMediaQuery('(max-width: 768px)')
</script>

<template>
  <Teleport to="body" :disabled="isMobile">
    <nav class="sidebar">Navigation</nav>
  </Teleport>
</template>

Logical Hierarchy Is Preserved

Teleport changes DOM position, not the Vue component tree. Props, emits, slots, and provide/inject still work:

<template>
  <Teleport to="body">
    <ChildPanel :message="message" @close="open = false" />
  </Teleport>
</template>

Multiple Teleports to the Same Target

Teleports to the same target append in declaration order:

<template>
  <Teleport to="#notifications">
    <div>First</div>
  </Teleport>

  <Teleport to="#notifications">
    <div>Second</div>
  </Teleport>
</template>

Use a shared container to keep stacking predictable, and apply z-index only when you need explicit layering.