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Introduction to JavaScript Libraries and Frameworks

 

Introduction to JavaScript Libraries and Frameworks

What is a JavaScript Library?

A JavaScript library is a collection of pre-written code that you can use to perform common tasks more easily. It provides helpful functions to simplify tasks such as:

·         Manipulating the HTML DOM

·         Handling events

·         Making HTTP requests

·         Animations, utilities, and more

You call functions from the library whenever you want to use them.

What is a JavaScript Framework?

A JavaScript framework is a full structure or platform for building web applications. It provides a foundation and often dictates how your app is organized.

·         You write your application code inside the framework.

·         The framework calls your code at appropriate times (this is called inversion of control).

·         Frameworks typically handle routing, state management, UI rendering, and more.

Popular JavaScript Libraries

·         jQuery: Simplifies DOM manipulation and event handling.

·         Lodash: Utility functions for arrays, objects, and more.

·         Axios: Makes HTTP requests easier.

·         D3.js: Data visualization library.

Popular JavaScript Frameworks

·         React: Library (often called framework) for building UI components and single-page applications.

·         Angular: Full-featured framework by Google with two-way data binding and MVC architecture.

·         Vue.js: Progressive framework for building user interfaces, easy to learn and flexible.

What is Bootstrap?

·         Bootstrap is a popular CSS framework that also includes JavaScript components.

·         It helps quickly build responsive and mobile-friendly websites.

·         Provides ready-made styles and UI components like buttons, forms, navbars, modals, and more.

·         Works well alongside JavaScript libraries like jQuery.

How to Add Popular Libraries and Frameworks

Add jQuery (Library):

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>

Add Bootstrap (CSS & JS Framework):

<!-- Bootstrap CSS -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
 
<!-- Bootstrap JS Bundle (includes Popper.js) -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>

Simple Examples

1. jQuery Example: Hide a Button on Click

<button id="btn">Click me</button>
 
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
  $('#btn').click(function() {
    $(this).hide();
  });
</script>

2. Bootstrap Example: Styled Button

<button class="btn btn-primary">Bootstrap Button</button>
 
<!-- Add Bootstrap CSS link in <head> to style the button -->

3. React Example: Simple Button Component (JSX)

function MyButton() {
  const [visible, setVisible] = React.useState(true);
 
  return (
    visible && <button onClick={() => setVisible(false)}>Click me</button>
  );
}

 

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