Practice Event Listener (Observer) - 17.2.3 | 17. Event-Driven Programming | Advanced Programming
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Event Listener (Observer)

17.2.3 - Event Listener (Observer)

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Learning

Practice Questions

Test your understanding with targeted questions

Question 1 Easy

What is an event listener?

💡 Hint: Think about user interactions in an application.

Question 2 Easy

What is a callback function?

💡 Hint: What happens when you click a button?

4 more questions available

Interactive Quizzes

Quick quizzes to reinforce your learning

Question 1

What is the primary function of an event listener?

To initiate an event
To respond to an event
To stop an event

💡 Hint: Think about what happens after an event occurs.

Question 2

True or False: Event listeners can only be used in web applications.

True
False

💡 Hint: Consider different programming languages and platforms.

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Challenge Problems

Push your limits with advanced challenges

Challenge 1 Hard

Design an event listener in JavaScript that changes the background color of a webpage when a button is clicked. Provide both the HTML and JavaScript.

💡 Hint: Think about how to connect the button and the event action.

Challenge 2 Hard

Write a small Python Tkinter application with a button that uses an event listener to print a message when clicked.

💡 Hint: Remember to set up the main loop for the GUI.

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Reference links

Supplementary resources to enhance your learning experience.