JS DOM Navigation
What is JS DOM Navigation?
The DOM (Document Object Model) is a programming interface for HTML documents. It represents the page so that programs can change the document structure, style, and content. JavaScript uses the DOM to dynamically modify web pages.
Syntax & Usage
The syntax and usage patterns for JS DOM Navigation follow standard JavaScript conventions. Below you will see code examples that demonstrate the most common use cases. Try modifying these examples in your own editor to experiment with different approaches.
Example
Here is a practical example demonstrating JS DOM Navigation:
Tips & Best Practices
- Use
constby default,letwhen you need to reassign - Use strict equality (
===) instead of loose equality (==) - Handle errors with try/catch blocks for robust code
- Use template literals instead of string concatenation
Summary
In this lesson you learned about JS DOM Navigation. Practice writing code to reinforce these concepts and move on to the next lesson when you feel comfortable.
Examples
// Selecting elements
const title = document.getElementById('title');
const items = document.querySelectorAll('.item');
const first = document.querySelector('.item');
// Changing content
title.textContent = 'New Title';
title.innerHTML = '<em>New Title</em>';
// Changing styles
title.style.color = 'blue';
title.style.fontSize = '24px';
// Adding/removing classes
title.classList.add('active');
title.classList.remove('hidden');
title.classList.toggle('highlight');Test Your Knowledge
Take a quick quiz to check what you've learned in this lesson.