JavaScript / JavaScript DOM Manipulation

Introduction to the DOM

This tutorial will provide an introduction to the Document Object Model (DOM), a key concept in web development. You'll learn about the structure of the DOM and how it represents …

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JavaScript Basics JavaScript Control Structures JavaScript Functions JavaScript Arrays and Objects JavaScript DOM Manipulation JavaScript Events JavaScript Object-Oriented Programming (OOP) JavaScript ES6+ Features JavaScript Asynchronous Programming JavaScript Error Handling and Debugging JavaScript APIs and Fetching Data JavaScript Local Storage and Session Storage JavaScript Modules and Import/Export

Section overview

5 resources

Covers how to manipulate the Document Object Model (DOM) using JavaScript.

1. Introduction

Welcome to this tutorial! The goal of this lesson is to provide an introduction to the Document Object Model (DOM), which is a crucial concept in web development. By the end of this tutorial, you should have a foundational understanding of the DOM, including its structure and how it represents a webpage.

Prerequisites:
- Basic understanding of HTML
- Familiarity with JavaScript is helpful, not mandatory

2. Step-by-Step Guide

The Document Object Model (DOM) is a programming interface for HTML and XML documents. It represents the structure of a document and allows programming languages like JavaScript to manipulate the document's content, structure, and styling.

2.1 Understanding the DOM Tree

The DOM represents a document as a tree structure wherein each node of the tree ends in a node, and each node contains objects. The DOM tree starts at the "Document" object. The nodes in the DOM tree have a hierarchical relationship to each other. The terms parent, child, and sibling are used to describe the relationships.

2.2 Manipulating the DOM

We can manipulate the DOM with various methods, such as getElementById(), querySelector(), createElement(), appendChild(), and many more.

3. Code Examples

3.1 Accessing Elements

<!DOCTYPE html>
<html>
<body>
  <h2 id="title">Hello World!</h2>
  <p id="intro">Welcome to the introduction of DOM!</p>
  <script>
    // Accessing an element using getElementById
    let title = document.getElementById("title");
    console.log(title.innerHTML);  // Expected output: Hello World!
  </script>
</body>
</html>

3.2 Changing Elements

<!DOCTYPE html>
<html>
<body>
  <h2 id="title">Hello World!</h2>
  <button onclick="changeTitle()">Change Title</button>
  <script>
    // Changing the content of an element
    function changeTitle() {
      let title = document.getElementById("title");
      title.innerHTML = "DOM is fun!";
    }
  </script>
</body>
</html>

4. Summary

We've covered the basics of the DOM, including how it represents a document as a tree of objects, and how we can use JavaScript to manipulate these objects to change the content, structure, and style of a webpage.

Next Steps:

To further your understanding, try manipulating different elements on a webpage using various DOM methods like querySelector(), createElement(), removeChild(), etc.

Additional resources:

5. Practice Exercises

Section overview

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