What is javascript ?

what is javascript

JavaScript is a text-based programming language used both on the client-side and on the server-side that allows you to make web pages interactive. Where HTML and CSS are languages ​​that provide structure and style to web pages, JavaScript provides interactive elements to web pages that engage the user. Common examples of JavaScript you can use every day include the search box on Amazon, a news recap video embedded on The New York Times, or refreshing your Twitter feed.

The inclusion of JavaScript improves the user experience of the web page by converting it from a static page to an interactive one. In short, JavaScript adds behavior to web pages.

What is JavaScript ?

JavaScript is a text-based, object-oriented programming language used to make webpages and apps more dynamic and interactive for visitors.

Used on both the client and server side, JavaScript provides advanced capabilities that basic languages ​​like HTML and CSS cannot, such as refreshing Twitter feeds, embedded YouTube videos, and more. In other words, JavaScript-enhanced webpages are more dynamic and user-focused, which can keep users coming back to the site.

That said, JavaScript is meant to be used instead of other programming languages ​​as their replacement.

For example, websites and apps will still need to use HTML for basic structure, while CSS is supposed to control formatting and layout preferences as well as how text, images, and other content is presented on a webpage. To do. it is necessary to do. From there, JavaScript can enhance those elements, making them interactive and exciting with static features.

A high-level definition

JavaScript is a scripting or programming language that allows you to implement complex features on web pages – each time a web page does more than just sit there and display static information for you to view – timely content updates, interactive Map, Animated 2D / Displaying. 3D graphics, scrolling video jukeboxes, and more—you can bet JavaScript is included. This is the third layer of the layer cake of standard web technologies, two of which (HTML and CSS) we cover in more detail in other parts of the learning area.

  1. JavaScript : JavaScript is a scripting or programming language that allows you to implement complex features on web pages – every time a web page does more than just sit there and display static information for you to look at – displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. -you can bet that JavaScript is probably involved. It is the third layer of the layer cake of standard web technologies, two of which (HTML and CSS) we have covered in much more detail in other parts of the Learning Area.
  2. HTML : HTML is the markup language that we use to structure and give meaning to our web content, for example defining paragraphs, headings, and data tables, or embedding images and videos in the page.
  3. CSS : CSS is a language of style rules that we use to apply styling to our HTML content, for example setting background colors and fonts, and laying out our content in multiple columns.

What is javascript used for ?

JavaScript is mainly used for web-based applications and web browsers. But JavaScript is also used beyond the Web in software, servers and embedded hardware controls. Here are some basic things JavaScript is used for :

Adding interactive behavior to web pages :

JavaScript allows users to interact with web pages. There’s almost no limit to what you can do with JavaScript on a web page – these are just a few examples :

  • Show or hide more information with the click of a button
  • Change color of button when mouse hovers over it
  • Slide through the carousel of images on the homepage
  • Zoom in or out of an image
  • Display a timer or countdown on a website
  • Play audio and video in web page
  • display animation
  • Using the Drop-Down Hamburger Menu

Web and mobile app creation :

Developers can use various JavaScript frameworks to develop and build web and mobile apps. A JavaScript framework is a collection of JavaScript code libraries that provide pre-written code for developers to use for routine programming features and functions—literally a framework for building websites or web applications.

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Popular JavaScript front-end frameworks include React, React Native, Angular, and Vue. Many companies use Node.js, a JavaScript runtime environment built on Google Chrome’s JavaScript V8 engine. Some well-known examples include PayPal, LinkedIn, Netflix, and Uber!

Creating Web Servers and Developing Server Applications :

In addition to websites and apps, developers can use JavaScript to build simple web servers and develop back-end infrastructure using Node.js.

Game Development :

Of course, you can also use JavaScript to make browser games. It is a great way for developers to practice their JavaScript skills.

What is javascript in html ?

HTML (Hypertext Markup Language) is the most basic building block of the web. It defines the meaning and structure of web content. It is a combination of hypertext and markup language. Hypertext defines the link between web pages.

Like CSS, JavaScript can be used in HTML in a number of ways, such as :

Related : html converter

Inline JavaScript :

Here, you have JavaScript code in HTML tags in some special JS-based attributes.

For example, HTML tags have event attributes that allow you to execute some code inline when an event is triggered. Here’s what I mean :

This is an example of inline JavaScript. The value of onclick can be some Match calculation, a dynamic addition to the DOM – any syntax-valid JavaScript code.

Internal JavaScript, with the script tag :

Like the style tag for style declarations within an HTML page, the script tag exists for JavaScript. Here’s how it is used :

Related : how to start an html document

External JavaScript :

You may want to keep your JavaScript code in a separate file. External JavaScript allows this. For such use cases, here’s how it’s done :

The src attribute of a script tag allows you to apply the source to JavaScript code. That context is important because it also informs the browser to fetch the contents of script.js.

script.js can be in the same directory with index.html, or it can be obtained from another website. For the latter, you need to pass the full URL (https://…/script.js).

Notice the .js extension? It is the extension of JavaScript files in HTML just like .html.

Now that we have seen how to implement JavaScript in our HTML, let’s look at some of the features of JavaScript.

Benefits of using Javascript

  • Interactivity : JavaScript websites are more interactive and attractive to users as the language creates richer and more attractive interfaces.
  • Speed : Websites will load and operate at higher speeds because JavaScript can be run quickly in the browser, reducing the demand on the server.
  • Ease : It is easy to implement and often requires only a basic level of knowledge to use.
  • Integration: JavaScript works well with most other programming languages, making it possible to integrate into a host of different applications.
  • Popularity : It is incredibly popular – most websites use some form of JavaScript, regardless of the nature of the website.

There are no disadvantages to using JavaScript. The primary issue is that JavaScript code has the potential for client-side security breaches, as it is observable to users. Despite this, JavaScript remains the most popular programming language at the moment, and given that it is a native programming language for web browsers, it is worth it for new programmers to learn the basics and use them in projects.