Deferred transitions in Svelte - Mini Project: Build & Apply

Deferred Transitions in Svelte

📖 Scenario: You are building a simple Svelte app that shows a list of messages. You want to add a smooth fade transition when messages appear, but only after a short delay to avoid overwhelming the user if many messages appear quickly.

🎯 Goal: Create a Svelte component that displays a list of messages with a fade transition that starts after a 500ms delay, demonstrating deferred transitions.

📋 What You'll Learn

Create a messages array with three exact strings.

Add a delay variable set to 500.

Use Svelte's fade transition with the delay variable on each message.

Render the messages inside a <ul> with each message in a <li>.

💡 Why This Matters

🌍 Real World

Deferred transitions help improve user experience by preventing too many animations from happening at once, making interfaces feel calmer and more polished.

💼 Career

Understanding how to control transitions and animations in frameworks like Svelte is valuable for frontend developers building interactive web apps.

1

Create the messages array

Create a variable called messages and set it to an array with these exact strings: 'Hello', 'Welcome', and 'Goodbye'.

Svelte

# Your code here

Hint

Use let messages = ['Hello', 'Welcome', 'Goodbye']; to create the array.

2

Add a delay variable

Add a variable called delay and set it to 500 to represent the delay in milliseconds.

Svelte

let messages = ['Hello', 'Welcome', 'Goodbye'];
# Your code here

Hint

Use let delay = 500; to set the delay.

3

Use fade transition with delay

Import the fade transition from 'svelte/transition'. Then, inside the markup, use a <ul> element. For each message in messages, create a <li> that uses the fade transition with the delay variable.

Svelte

import { fade } from 'svelte/transition';

let messages = ['Hello', 'Welcome', 'Goodbye'];
let delay = 500;

Hint

Use {#each messages as message} to loop and transition:fade={{ delay }} on each <li>.

4

Complete the component

Ensure the entire Svelte component includes the import, variables, and markup with the deferred fade transition on the messages list.

Svelte

import { fade } from 'svelte/transition';

let messages = ['Hello', 'Welcome', 'Goodbye'];
let delay = 500;


  {#each messages as message}
    {message}
  {/each}

Hint

Check that the component has all parts: import, variables, and markup with transitions.