10 Questions
What is the purpose of an event handler in a program?
To execute a response to an event
What type of event is triggered when a user presses a key on their keyboard?
Keyboard Event
What is the primary benefit of using a JavaScript framework?
Faster development
What is the purpose of the addEventListener() method?
To add an event listener to an element
What is the Document Object Model (DOM) in JavaScript?
A tree-like representation of an HTML document
What is the purpose of the createElement() method?
To create a new element
What is the purpose of the innerHTML property in DOM manipulation?
To set or retrieve the HTML content of an element
What is the primary use case for DOM manipulation in responsive design?
Updating styles and layouts based on screen size and device type
What is the purpose of the removeChild() method in DOM manipulation?
To remove an element from a parent element
What is the primary benefit of using a JavaScript framework like React?
Faster development and easier maintenance
Study Notes
Event Handling
- Event: an action or occurrence that triggers a response in a program
- Event Handler: a function that is executed in response to an event
- Types of Events:
- Mouse Events: click, dblclick, mouseover, mouseout, etc.
- Keyboard Events: keydown, keyup, keypress, etc.
- Form Events: submit, change, focus, blur, etc.
- Event Listeners: attached to elements to listen for events
-
addEventListener()method: adds an event listener to an element -
removeEventListener()method: removes an event listener from an element
-
- Event Object: provides information about the event, such as the target element and coordinates of the mouse click
JavaScript Frameworks
- Definition: a collection of pre-built components and tools that simplify JavaScript development
- Popular Frameworks:
- React: for building user interfaces and single-page applications
- Angular: for building complex web applications
- Vue.js: for building progressive and flexible web applications
- Benefits:
- Faster development: pre-built components and tools speed up development
- Easier maintenance: frameworks provide a structured approach to coding
- Large communities: frameworks have large communities that provide support and resources
DOM Manipulation
- DOM (Document Object Model): a tree-like representation of an HTML document
- Methods for DOM Manipulation:
-
document.getElementById(): retrieves an element by its ID -
document.querySelector(): retrieves an element using a CSS selector -
createElement(): creates a new element -
appendChild(): adds a new element to a parent element -
removeChild(): removes an element from a parent element
-
- Properties for DOM Elements:
-
innerHTML: sets or retrieves the HTML content of an element -
textContent: sets or retrieves the text content of an element -
style: sets or retrieves the CSS styles of an element
-
- Common Use Cases:
- Dynamic content generation: creating and adding elements dynamically
- Responsive design: updating styles and layouts based on screen size and device type
Test your knowledge of JavaScript basics, including event handling, frameworks, and DOM manipulation. Learn about event listeners, popular frameworks, and methods for manipulating the Document Object Model.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
