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JAVASCRIPT is a scripting language used to create and control dynamic website content i.e., anything that moves, refreshes, or otherwise changes on your screen without requiring you to manually reload a web page.

JavaScript is a necessity in the technical field. The good news is that JavaScript isn’t as scary as it sounds. JavaScript includes features like:

  1. Animated graphics.
  2. Photo Slideshow.
  3. Autocomplete text suggestions.
  4. Interactive forms.

How do you add JAVASCRIPT to a website?

Adding JavaScript code to a web page is a pretty simple process (and a familiar one if you’ve done any coding with HTML and CSS). JavaScript can be added directly to a page’s code using <script> tags and then giving them the type attribute text/javascript.

CSS:
<style>
CSS goes here
</style>
JAVASCRIPT:
<script type=”text/javascript”>
JavaScript code goes here
</script>

JavaScript can also be added to a page as a separate header file with the extension .js. The script is then downloaded and then processed in each individual’s web browser, turning it into the dynamic objects and effects they see on their screen.

What can in-browser JavaScript do?

JavaScript is a safe programming language. It was initially created for browsers that do not require low-level access to memory or CPU.
In-browser JavaScript can do everything related to web-page manipulation, interaction with the user, and the webserver.
For instance, in-browser JavaScript can:

  • Add new HTML to the page, change the existing content, modify styles.
  • React to user actions, run on mouse clicks, pointer movements, key presses.
  • Send requests over the network to remote servers, download and upload files (so-called AJAX technologies).
  • Get and set cookies, ask questions to the visitor, show messages.
  • Remember the data on the client-side(“local storage”).

What is Vanilla JavaScript?

Vanilla JavaScript is the JavaScript language “as is” without using any tools to make the coding easier and more efficient.
Example: If you want the user to receive a “thanks for signing up” confirmation message after signing up for an offer or service on a website, you would code it directly into an HTML page like this:

<script>
window.onload = initAll;
function initAll() {
document.getElementById(“submit”).onclick = submitMessage;
}
function submitMessage() {
var greeting = document.getElementById(“name”).getAttribute(“value”);
document.getElementById(“headline”).innerHTML = “Thank you for joining our email list,” + greeting;
return false;
}
</script>

ADVANCED JAVASCRIPT: FRAMEWORKS AND LIBRARIES

JQUERY – JavaScript Library:

  • You must’ve noticed JS functions and features that show up regularly across multiple websites or web apps, things like menu animations and fade-outs, file upload form, and image galleries. While you could code each of these things every time you need one, your coding life will feel a lot easier if you use coding libraries like jQuery instead.
  • The jQuery library is made up of JavaScript coding functions that can be performed through single line jQuery commands.
  • For example, the above same JavaScript code will look like this if t’s performed using jQuery instead:
    <script>
    $(“#submit”).click(function() {
    var greeting = $(“#name”).val();
    $(“#headline”).html(“Thank you for joining our email list, “ + greeting);
    return false;
    });
    </script>
  • As you can see, the jQuery programming approach is a lot more concise, and it can be reused any time you want to perform the same JavaScript function while coding a website.

REACT JS – A Front End Developer’s Best Freind

  • Along with jQuery, React JS is another JavaScript library for web developers. React JS is a front end JavaScript library developed by Facebook in 2011 and designed specifically for building UIs.
  • React allows developers to use prewritten code for repetitive menu objects and effects (like interactive forms, autocomplete features, fade-in or out menu animations, etc.), and it also improves overall site speed and performance through a feature called Virtual DOM.
  • For example,
    ReactDOM.render(
    <h1>Hello, World!</h1>,
    document.getElementById(‘root’)
    );

Other Frameworks in JavaScript:

  • Angular, React.js, jQuery, Node.js, Etc.

Applications:

JavaScript is one of the most widely used programming languages (Front-end as well as Back-end). It has its presence in almost every area of software development, such as:

  • Client-side validation – This is important to verify any user input before submitting it to the server and JavaScript plays an important role in validating those inputs at the front-end itself.
  • Manipulating HTML Pages – JavaScript helps in manipulating HTML pages on the fly. This helps in adding and deleting any HTML tag very easily using javascript and modifying your HTML to change its look and feel based on different devices and requirements.
  • User Notifications – You can use JavaScript to raise dynamic pop-ups on the webpages to give different types of notifications to your website visitors.
  • Back-end Data Loading – JavaScript provides Ajax library which helps in loading back-end data while you are doing some other processing. This gives an amazing experience to your website visitors.
  • Presentations – JavaScript also provides the facility of creating presentations which give the website a look and feel. JavaScript provides RevealJS and BespokeJS libraries to build web-based slide presentations.
  • Server Applications – Node JS is built on Chrome’s JavaScript runtime for building fast and scalable network applications. This is an event-based library which helps in developing very sophisticated server applications including Web Servers.

This list goes on, as there are various areas where millions of software developers are happily using JavaScript to develop great websites and other software.
CONSOLE:
The console is a panel that displays important messages, like errors, for developers. Much of the work the computer does with our code is invisible to us by default.
In JavaScript, the console keyword refers to an object, a collection of data and actions, that we can use in our code. Keywords are words that are built into the JavaScript language, so the computer will recognize them and treat them specially.
One action, or method, that is built into the console object is the .log() method. When we write console.log() what we put inside the parentheses will get printed, or logged, to the console.
It’s very useful for us to print values to the console, so we can see the work that we’re doing.
console.log(5);

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