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UsmanGhias CODCrafters JavaScript Web Development C014 Paid

Here's what we'll be going over

Introduction to JavaScript
Java vs JavaScript
All OK but Why JavaScript?
Linking JavaScript, HTML, and CSS
External JavaScript
DOM in JavaScript

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Introduction to JavaScript

JavaScript is the web scripting language developed by Netscape. It is the most popular programming language in the world today. The language was standardized to ECMAScript, as a cross-platform Internet standard for scripting, but it is still most commonly called JavaScript.

JavaScript is a programming language that is commonly used to add interactivity to web pages. It is a client-side language, which means that it is executed by the user's web browser rather than by a server. JavaScript is a versatile language that can be used to create a wide range of effects on a web page, including animations, form validation, and interactive elements such as dropdown menus and sliders.

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To use JavaScript on a web page, you can include the script in the HTML code of the page, either in the <head> or <body> element. You can also include JavaScript from an external file by linking to it using the <script> element.

Click Me: JavaScript

<button onclick="showAlert()">Click me</button>

<script>
function showAlert() {
alert('Hello, world!');
}
</script>

2 days ago

JavaScript is an essential tool for web development, and a fundamental skill for any modern web developer. It is a powerful and flexible language that is widely used in a range of applications, including web development, mobile development, and server-side programming.

Java vs JavaScript

Java is a general-purpose, object-oriented programming language that is designed to be used for building large-scale applications. It is a compiled language, which means that it is converted into machine code that can be run on a computer before it is executed.	JavaScript, on the other hand, is a scripting language that is primarily used for creating interactive web pages. It is an interpreted language, which means that it is executed by the browser at runtime rather than being compiled ahead of time.
//You can scroll Code to left in Mobile Phone public class AOAWorld { public static void main(String[] args) { System.out.println("AOA, world!"); } } // Code to print AOA, World on Console screen	//You can scroll Code to left in Mobile Phone <button onclick="showAlert()">Click me</button> <script> function showAlert() { alert('AOA, world!'); } </script>

A lot of people confuse JavaScript with Java and are under the impression that JavaScript is a ‘script-ier’ version of Java and begin to learn it. That cannot be further from the truth; Java is to JavaScript what car is to carpet. They don’t have anything to do with each other.

JavaScript is syntactically similar to C and C++, though. If you are familiar with these languages, you will be comfortable learning JavaScript. However, if you don’t have any prior programming experience, you will find JavaScript a bit challenging.

All OK but Why JavaScript?

JavaScript allows you to implement complex things on web pages; every time a web page does more than just display static information such as content updates, interactive maps, and animated 2D/3D graphics, JavaScript is probably involved. It is the third layer of standard web technologies, two of which (HTML and CSS) we have already covered.

JavaScript is a widely used language for building interactive and dynamic web pages. It is supported by all modern web browsers, and is essential for creating a wide range of effects, including animations, form validation, and interactive elements such as dropdown menus and sliders.
JavaScript is a crucial part of the modern web development ecosystem. It is used in combination with HTML and CSS to build modern web applications, and is often used in conjunction with libraries and frameworks such as React, Angular, and Vue.js.
Learning JavaScript can open up a wide range of career opportunities. It is a highly sought-after skill in the tech industry, and is essential for becoming a full-stack web developer or working on web-based projects.
JavaScript is a powerful and flexible language that can be used to create a wide range of applications, including web applications, mobile applications, and server-side applications. It is a versatile language that can be used in a range of different contexts, and is a valuable skill to have in any developer's toolkit.

The web browser console

If you have taken a basic programming course, you would know that you can print things on to the terminal. For example, you can use cout << string in C++ to print string. But how do you do this in a JavaScript program since JavaScript runs on browsers? Well, it turns out all browsers have a console that is not displayed by default but can be viewed. If you are on Chrome or Firefox, for example, just hit Cmd+Option+J on Mac or Ctrl+Shift+J on Windows to view the console! You can do something similar on Safari.

Linking JavaScript, HTML, and CSS

By this point, you must be thinking, “Okay this is great, but how do I actually run JavaScript code on my browser together with HTML and CSS?” Well, there are two ways to do so,

JavaScript code in the HTML file
JavaScript can be written directly into an HTML file using the <script> tag. For example,

<!DOCTYPE html>
<html>
  <head>
    <link rel="stylesheet" type="text/css" href="style.css">
    <script src="script.js"></script>
  </head>
  <body>
    <!-- HTML content goes here -->
  </body>
</html>

External JavaScript

JavaScript files (files with a ‘.js’ extension) can otherwise be imported into HTML files similar to how CSS files are imported,

<script src="myJSscript.js"></script>
You can place an external script reference in the <head> or the <body>. The imported script will behave as if it was written exactly where the <script> tag is located.

DOM in JavaScript

The Document Object Model (DOM) is a programming interface for HTML and XML documents. It represents the structure of a document as a tree of objects, with each object representing a part of the document (e.g., an element, an attribute, or a piece of text).

The DOM allows developers to programmatically manipulate the content and structure of a document, using JavaScript or other programming languages. This allows developers to create dynamic and interactive web pages that can respond to user input and change in real-time.

<p id="example">This is the original text</p>

<script>
  // Get a reference to the element
  var element = document.getElementById('example');

  // Change the text of the element
  element.innerHTML = 'This is the new text';
</script>

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Comments (10)

JavaScript is a versatile programming language primarily used for adding interactivity and dynamic behavior to websites and web applications.
It enables developers to create client-side scripts that run directly in a user's web browser, enhancing user experiences without the need for server-side processing.
JavaScript can manipulate the Document Object Model (DOM), allowing developers to change, add, or remove elements on a webpage dynamically.
It supports a wide range of programming paradigms, including procedural, object-oriented, and functional programming, making it adaptable to various coding styles.
Event handling in JavaScript allows developers to respond to user actions like clicks, keyboard inputs, and mouse movements, enabling interactive and responsive interfaces.
AJAX (Asynchronous JavaScript and XML) enables the exchange of data with a server without requiring a full page reload, leading to smoother and faster user interactions.
Modern JavaScript frameworks and libraries like React, Angular, and Vue.js simplify the development of complex front-end applications by providing reusable components and state management.
Node.js extends JavaScript's capabilities to the server-side, allowing developers to build server applications using the same language they use for client-side scripting.
ES6 (ECMAScript 2015) introduced significant enhancements to JavaScript, including arrow functions, classes, template literals, and the spread/rest operator, improving code readability and maintainability.
JavaScript can manipulate and work with various data formats, including JSON (JavaScript Object Notation), making it a cornerstone of modern web APIs and data exchange.
Cross-browser compatibility is a consideration when writing JavaScript code, as different browsers may implement features differently or have varying levels of support.
JavaScript has a vast and active community that contributes to its growth and development, with a wealth of tutorials, libraries, and resources available for both beginners and experienced developers.
With the rise of web technologies like WebAssembly, JavaScript is expanding its reach beyond the browser, allowing developers to run high-performance code written in other languages alongside JavaScript.
Understanding JavaScript is essential for front-end development and increasingly important for full-stack developers, as it plays a critical role in creating interactive and feature-rich web applications.