JavaScript Tutorial

JavaScript is cross-platform and open source. It is basically designed to create web applications and it is very easy to understand and learn because it uses HTML.
JavaScript is the most popular client-side scripting language used for web applications. JavaScript is supported by all browsers and it is set as default. JavaScript provides full integration with CSS and HTML.

Why do we need to learn JavaScript?

JavaScript is a scripting language that is different from java and it is used as a frontend language. JavaScript uses HTML and CSS and most of the browsers implement JavaScript. JavaScript can be used in game development, app development, desktop application development. JavaScript has many frameworks like react, jQuery, angular.

1) JavaScript: JavaScript is used to program the behavior of the web pages and what data we need to display to the user.
2) CSS: CSS we used to specify the design or the layout of the webpages, how they will display to the user.
3) HTML: HTML is used to define the content of the web pages. It basically displays the data which extracts from the business logic.

• It allows us to store our data to the local storage for further use.
• We can also send a request to the server.
• It can also show dynamic contact to the user depending upon our business logic or requirement.
• It also used for animation effects like sound and movement.
• JavaScript provides us various events depend upon user action like keypresses, mouse click event and pointer movement.

Applications of JavaScript

Presentations: JavaScript is used to create presentations also which give our website interactive feel and look also make it user-friendly. JavaScript provides libraries to implement these presentations i.e. BespokeJS and RevealJS we can use these libraries to build web-based presentations.
User Notifications: JavaScript is used to provide notifications to users. It provides us dynamic notifications on the webpages.
Server Applications: JavaScript is an event-based library that is used to build scalable and fast applications.
Manipulating HTML: Using JavaScript we can modify the HTML pages. By using JavaScript we can easily delete or add any HTML tag depending upon the requirement which provides the look and feels to our application.
Client-side validation: JavaScript provides us with validate data at the client-side only. So before submitting user input and send them to the server-side, we can pre-validate our data using JavaScript libraries.
Back-end Data Loading: In JavaScript, we use ajax calls to load data from the backend. This can be done while we are doing some other task or any other data processing.

Example

<!DOCTYPE html> <html> <body> <h2> Javascript demo program </h2> <button type="button" onclick="document.getElementById('demo1').innerHTML = Date()"> Press me! I will display the current date and time.</button> <p id="demo1"></p> </body> </html>

Output:

Prerequisites

Any programmer with a basic understanding of HTML and CSS with added advantage if they have some knowledge of the object-oriented programming language.

Target Audience

We have created this article for beginners to make them understand how to create dynamic web pages.