codex-lv2-may-2025

Lesson 2: Buttons and Events

📚 Previous Lesson

Coming from Lesson 1: Intro to App Lab? Excellent! Now you’ll learn how to make your apps interactive with buttons and event handling.

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🎯 Learning Objectives

• Understand how buttons work in App Lab
• Learn to handle click events
• Create interactive user interfaces
• Connect design elements to code

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🚀 Step 1: Understanding Buttons and Events

Buttons are the foundation of interactive apps. They allow users to trigger actions and make your app respond to input.

Event Flow:

1. User clicks a button
2. App detects the click event
3. Event handler function executes
4. App responds with the desired action

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📱 Step 2: Practice with Buttons and Events

Visit the Code.org lesson to practice:

🎮 Start Buttons and Events Lesson

What to Focus On:

• Adding buttons to your app design
• Writing event handler functions
• Connecting buttons to code
• Testing your interactive elements

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💡 Key Concepts to Remember

• Button Element: UI component that users can click
• onEvent(): Function that handles button clicks
• Event Handler: Code that runs when an event occurs
• Function: Reusable block of code that performs a task

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🔗 Additional Resources

• App Lab Events Documentation
• Event-Driven Programming in App Lab - Complete module with lessons and videos
• Basic JavaScript Snippets - Functions, variables, and control flow examples

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📚 Next Lesson

Ready to build something fun? Continue to Lesson 3: Build a Clicker App to create your first complete interactive application!