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How To Enable JavaScript

Introduction

JavaScript is an interpreted, object-based scripting language. Although it has fewer capabilities than full-fledged object-oriented languages like C++ and Java, JavaScript is more than sufficiently powerful for its intended purposes.

JavaScript can be used for Client-side developments via React-JS, Angular, Angular-JS, etc as well as Server-side developments via NODE-JS, etc. JavaScript contains a quality library of objects, for example, Array, Date & Math, and also a core set of language elements like operators, control structures, and statements. The core set of languages refers to HTML, CSS, and JavaScript.

  • JavaScript is more than sufficiently powerful for its intended purposes.
  • JavaScript makes it easier to create an interactive web page. Using JavaScript, developers can create forms, purchase orders and calculations based on customer need very simply and easily.
  • By using Java Scripts the entire work can be made easier by validating the form input at the client side. This saves a lots of time, as the data need not be sent to the server for validation
  • JavaScript is an extension of HTML. You can add JavaScript to your existing HTML documents by adding the <SCRIPT> tag.
  • JavaScript can be used to write client-side and server-side applications. Client applications run in a browser and server applications run on a Web server.

Overview

First of all, some topics are present that should already you should know stated as,

  •  A general understanding of the internet and the World Wide Web (WWW).
  •  Language command on hypertext markup language (HTML).
  •  Basic knowledge of JavaScript.

Steps to enable JavaScript in the browser are as follows,

Many internet website contains JavaScript, known as a popular scripting language that is useful in rendering functionality on web browsers.

Steps may vary on various browsers such as (Google Chrome, Mozilla Firefox, Brave, etc).

Steps

Open the browser on a computer.

Open settings in the browser.

  • Click on Security and Privacy.
  • Then click on Site Settings.

  • Go to additional permissions under the site setting section.
  • For additional permission, click on the JavaScript option and enables it.

Now come JavaScript's Coding part.

JavaScript is distributed in two different categories:

  1. Inline JavaScript.
  2. External JavaScript.

Inline JavaScript

When a script tag is used in the HTML file, it is called in-lining. This means no external JS file is used instead JavaScript is put into an HTML file. Modern code has moved from manual coding and customized structures to templates that provide a framework\library for the effective creation of code.

Inline JavaScript can be achieved by using a script tag inside the body of the HTML, and instead of specifying the source(src=”…”) of the JavaScript file in the Script tag, we have to write all the JavaScript code inside the Script tag.

Example via code snippet:

JavaScript is one of the most popular, interpreted, lightweight, and compiled programming languages. It is synchronous and single- threaded. The programs in JavaScript are called scripts which are executed as plain texts. We can write these scripts directly on our HTML page or use an external JavaScript file. JavaScript can execute in the browser, and also on the server, actually, it can run on any device that has a special program called the JavaScript engine. JavaScript can be enclosed in HTML pages even on the server. The server-side statements can 

  • Connect to databases
  • Share info across users of an application
  •  Access the file system on the server 
  • Communicate with other applications through programs.

External JavaScript

It is known to be the other way of writing JavaScript code containing a .js extension. Therefore convenient way to link a particular JavaScript file in the <body> tag of HTML.

Explanation via code snippet

From the above image, we can illustrate that to link files we just have to create a folder/files in the repository. Such as we just create a JS folder and in that folder, we can have as many .JS files as we want.

Then, to link it we just have to open our main index file of HTML and print that syntax in the body tag.

<html>
    <head>
        <title>Java Script Entities</title>
            <script language=”JavaScript”>
               <!—Being Hiding JavaScript 
               Mylink=”http://www.myjavascript.com”
               //End Hiding JavaScript-- ->
            </script>
        <body>
            <a href= ”&(mylink);”>Click Here</a>
        </body>
</html>

This code shows how the HREF attribute may be specified using a JavaScript variable. JavaScript entities allow the value of an HTML attribute to be provided by a JavaScript expression. This allows the attribute values to be dynamically calculated during the loading of a page. 

How Java Script has enabled on Web Server?

JavaScript can be enclosed in HTML pages even on the server. Client-side JavaScript can also be included into HTML pages with Server-side JavaScript. However, before using server side JavaScript statements, they need to be complied. When these scripts are called from a server, the Web server starts the JavaScript runtime engine, which executes the JavaScript before displaying the results in the clients’ browser in HTML. In contrast to browser based JavaScript scripts, server-side JavaScript programs have to complied into executable files. These application executables are needed to run on a Web Server, which possesses the JavaScript runtime engine. This makes creating JS applications a two-stage process.

Firstly, HTML pages containing both client-side and server-side JavaScript statements are created along with JavaScript files. All of these files are then complied into a single executable.

Secondly, the client browser then requests the executable. From the executable, the complied representation of that page is searched by runtime engine, and any server-side JavaScript statement, if found on the page, are executed, and a dynamically generated HTML page is returned to the browser. The result of executing server-side JavaScript statements adds a new HTML or client-side JavaScript statements to the original HTML page. The runtime engine sends the newly generated page over and on the network to the Navigator client, which runs any client-side JavaScript and displays the results.

Summary

In this article, we gonna learn how to enable JavaScript in the browser as well as in the coding part. JavaScript increases the interactivity of web pages by providing many programming constructs. JavaScript is mostly used on the client side for validations and for providing dynamic effects to the web pages such as change in background color, font etc. They can also be used on server-side applications.


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