tick function in Svelte - Mini Project: Build & Apply

Using the tick Function in Svelte

📖 Scenario: You are building a simple Svelte component that updates a message after a button click. You want to wait for the DOM to update before logging the new message.

🎯 Goal: Create a Svelte component that changes a message when a button is clicked and uses the tick function to wait for the DOM update before logging the new message.

📋 What You'll Learn

Create a message variable with initial text

Import the tick function from svelte

Write an async function updateMessage that changes message and awaits tick()

Add a button that calls updateMessage on click

💡 Why This Matters

🌍 Real World

Waiting for the DOM to update is useful when you want to perform actions that depend on the updated UI, like focusing an input or measuring element size.

💼 Career

Understanding how to use tick helps you build responsive and interactive Svelte apps that behave smoothly and correctly after state changes.

1

Set up the initial message variable

Create a let variable called message and set it to the string "Hello!".

Svelte

let message = "Hello!"

// Your code here

Hint

Use let message = "Hello!" to create the variable.

2

Import the tick function

Import the tick function from the svelte package using import { tick } from 'svelte';.

Svelte

import { tick } from 'svelte';

let message = "Hello!"
// Your code here

Hint

Use import { tick } from 'svelte'; at the top of your file.

3

Create the async updateMessage function

Write an async function called updateMessage that sets message to "Updated!" and then awaits tick().

Svelte

import { tick } from 'svelte';

let message = "Hello!"

async function updateMessage() {
    // Your code here
}

Hint

Remember to mark the function as async and use await tick() after changing message.

4

Add a button to trigger updateMessage

Add a <button> element with an on:click event that calls updateMessage. Also, display the {message} variable inside a <p> tag.

Svelte

import { tick } from 'svelte';

let message = "Hello!"

async function updateMessage() {
    message = "Updated!";
    await tick();
}

Hint

Use <button on:click={updateMessage}>Update Message</button> and show {message} inside a paragraph.