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Vueframework~20 mins

Teleport for rendering elsewhere in Vue - Practice Problems & Coding Challenges

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Challenge - 5 Problems
🎖️
Teleport Mastery
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❓ component_behavior
intermediate
2:00remaining
What will be rendered by this Vue Teleport component?
Consider this Vue 3 component using Teleport. What will be the visible output in the DOM?
Vue
<template>
  <div id="app">
    <teleport to="#modal">
      <p>Modal content</p>
    </teleport>
    <p>Main content</p>
  </div>
</template>

<!-- Assume the HTML page has a div with id="modal" outside #app -->
AThe text 'Modal content' appears inside the element with id 'modal', and 'Main content' appears inside the #app div.
BBoth 'Modal content' and 'Main content' appear inside the #app div.
COnly 'Main content' appears; 'Modal content' is not rendered anywhere.
DBoth texts appear inside the element with id 'modal'.
Attempts:
2 left
💡 Hint
Teleport moves content to a different place in the DOM, outside the component root.
📝 Syntax
intermediate
2:00remaining
Which Teleport usage will cause a syntax error?
Identify the option that will cause a Vue template syntax error when using Teleport.
A
&lt;teleport to="#modal"&gt;
  &lt;p&gt;Content&lt;/p&gt;
&lt;/teleport&gt;
B
&gt;tropelet/&lt;
&gt;p/&lt;tnetnoC&gt;p&lt;  
&gt;"ladom#"=ot tropelet&lt;
C
teleport to="#modal"&gt;
  &lt;p&gt;Content&lt;/p&gt;
&lt;/teleport&gt;
D
&lt;teleport to="#modal"&gt;
  &lt;p&gt;Content&lt;/p&gt;
Attempts:
2 left
💡 Hint
Check if all tags are properly closed.
❓ state_output
advanced
2:00remaining
What is the output after clicking the button in this Teleport example?
Given this Vue 3 component, what text will appear inside the #modal element after clicking the button once?
Vue
<template>
  <div>
    <teleport to="#modal">
      <p>{{ message }}</p>
    </teleport>
    <button @click="updateMessage">Click me</button>
  </div>
</template>

<script setup>
import { ref } from 'vue'
const message = ref('Hello')
function updateMessage() {
  message.value = 'Clicked!'
}
</script>
AThe #modal element always shows 'Hello' and does not update after clicking.
BThe #modal element shows 'Hello' before click and updates to 'Clicked!' after clicking the button.
CThe #modal element shows 'Clicked!' immediately on page load.
DThe #modal element is empty and never shows any text.
Attempts:
2 left
💡 Hint
Teleported content is reactive like normal Vue content.
🔧 Debug
advanced
2:00remaining
Why does this Teleport content not appear in the target element?
This Vue 3 component uses Teleport, but the content does not show inside the #modal element. What is the most likely cause?
Vue
<template>
  <div>
    <teleport to="#modal">
      <p>Hidden content</p>
    </teleport>
  </div>
</template>

<!-- The HTML page does NOT have an element with id 'modal' -->
ATeleport content is hidden by default and needs a CSS class to show.
BTeleport requires the target to be inside the component's template, which is missing here.
CThe target element with id 'modal' does not exist in the DOM, so Teleport has nowhere to render.
DTeleport only works with class selectors, not id selectors.
Attempts:
2 left
💡 Hint
Check if the target selector matches an existing element in the page.
🧠 Conceptual
expert
2:00remaining
What is a key benefit of using Teleport in Vue 3?
Choose the best explanation of why Teleport is useful in Vue 3 applications.
ATeleport allows rendering a component's content outside its parent DOM hierarchy, useful for modals or tooltips that need to escape CSS overflow or stacking context.
BTeleport automatically duplicates component content in multiple places in the DOM for better SEO.
CTeleport replaces the root element of the Vue app with a new element specified by the 'to' attribute.
DTeleport delays rendering of content until the user scrolls to that part of the page.
Attempts:
2 left
💡 Hint
Think about UI elements like modals that appear above other content.