Join the Conversation!
Subscribing gives you access to the comments so you can share your ideas, ask questions, and connect with others.
Introduction to DOM
In this lesson, you'll learn about the Document Object Model (DOM), which is a crucial concept for interacting with web pages using JavaScript. The DOM provides a structured representation of a document, allowing you to access and manipulate its content and structure.
Introduction
The Document Object Model (DOM) is a standard for accessing and interacting with documents over the internet. It represents the structure of a document and provides a way for programming languages like JavaScript to understand and modify it.
What is the DOM?
- Structure Representation: The DOM represents how a document is structured, allowing for easy access and modification.
- Language Agnostic: While the DOM is not a programming language itself, it provides a standard interface for languages like JavaScript to interact with documents.
- HTML Focus: In this lesson, we'll focus on the HTML DOM, which defines how an HTML page is structured and can be modified.
HTML DOM
The HTML DOM is a tree of nested HTML elements that define the structure of a web page. It specifies:
- Structure: How an HTML page is organized.
- Modification: How elements can be added, removed, or changed.
- Properties and Styles: Attributes and styles that can be applied to elements.
- Standards: The version of the standard to be followed and valid elements for structuring a page.
Core and Specific DOMs
- Core DOM: Defines the basic structure for all documents.
- Specific DOMs: Extend the core DOM to support specific document types, such as HTML and XML.
Accessing the DOM
DOM elements can be accessed and modified using various methods. Here's a simple example to demonstrate how you can interact with the DOM:
Example: Alert on Document Load
You can use the event to trigger an action once the DOM is fully loaded:
<body onload="window.alert('Document loaded')"></body>Example: Adding Content Dynamically
Here's how you can add content to the DOM dynamically once it is loaded. In this example, we'll display today's date:
<html>
<head>
<script>
window.onload = function() {
const heading = document.createElement("h1");
const date = document.createTextNode(new Date().toString());
heading.appendChild(date);
document.body.appendChild(heading);
}
</script>
</head>
<body>
</body>
</html>Using JavaScript with the DOM
In the examples above, we use JavaScript to interact with the DOM using methods like , , and .
We also use DOM events like to perform actions when specific events occur. Commonly used events include , , and .
Understanding the DOM is essential for web development, as it allows you to create interactive and dynamic web pages by manipulating the structure and content of HTML documents.
Loading...
0 Comments
"Please login to view comments"
Upgrade your account