JavaScript Tutorial for Beginners and Advanced

Introduction to JavaScript

JavaScript is a client-side scripting language or cyber surfer scripting. Client-side scripting language means that the cyber surfer or browser will run/ execute these scripts. The opposite of client side is server side, the code of server-side languages is executed/run through the web server.

JAVA and JavaScript are completely different languages. JAVA is a complete object-oriented programming language and JavaScript is a scripting language. JavaScript is a programming language, but it works only in the browser whereas JAVA can be used to create a separate application that runs on the PC.

A lot of JavaScript, especially the syntax, is borrowed from JAVA, but it is not necessary to know JAVA or any language in advance to learn JavaScript.

JavaScript is basically made up of 3 things

ECMAScript (it is the core functionality of JavaScript)
DOM (Document Object Model - works with the content of web pages)
BOM (Browser Object Model - works with the browser)

With the help of JavaScript, various types of effects or interesting things can be created in an HTML page, and form validation and Ajax can also be done. Among the most well-known works

Mouse Trailers (Mouse animations during site browsing)
Dropdown menu
Alert message
Popup window
Form Validation
Slide show
breaking news
Many more.

JavaScript is a popular scripting language, which is used to enhance the interactivity and functionality of web pages, form validation, browser instructions, time and date instructions, etc. JavaScript can work on both the client and server sides. So, it can complete the necessary process with the data from the user and send it to the server. JavaScript was invented and developed by Brendan Eich of the ECMA International Organization. JavaScript's official name was ECMAScript.

Why is JavaScript used?

JavaScript is equally important in both web design and development. You will become a complete designer only when you can use JavaScript along with HTML and CSS. It will give you an opportunity to express your creativity. By opting different types of products one-commerce spots and determining their volume, the stoner can see the needed account of his order. If you want to add such a facility, you must take advantage of JavaScript. On the other hand, JavaScript is no match for creating various interactive effects.

JavaScript allows the HTML designer to create programming opportunities.

Those who write HTML code are not programmers. JavaScript is a scripting language, and it can be directly embedded with HTML, thus creating JavaScript programming opportunities.

JavaScript allows adding dynamic text to web pages

document.write(“
” + text + “
”)

Statement is written to add dynamic text. Here, a variable called text is used to display the data from the user or browser.

JavaScript can perform tasks based on state and timing.

Displaying a message to the user as soon as a page is fully loaded, displaying an alert when the mouse clicks on an element, greeting visitors according to date and time, etc. can be done through JavaScript.

Allows the user to select the design according to their preference

Through JavaScript, a user gets the opportunity to select one of the multiple style sets for a page as per his wish, i.e., the user can select the design according to his choice.

Validation of forms created in HTML is done through JavaScript

What kind of data a user can provide in the various fields of a form created through HTML, how the shape and structure of each data will be determined through JavaScript, and this is called form validation.

Directs the user's browser via JavaScript.

Depending on which browser the user is using, which page will load, or which stylesheet will be used for the page can be added via JavaScript.

Create interactive effects

JavaScript is used to create a variety of interactive effects, including photo galleries, image sliders, navigation bars, and text effects on various banners.

Here are the top 10 JavaScript shorthand’s for beginners

1. decimal number

If you are going to work as a developer in a bank or financial institution, then you must face this issue. Let's say you must enter the number tens. So how do you write? You write 1 and give eight zeros. So? But you can do this in JavaScript more easily. Only by typing '1e8' will the program understand that one followed by eight zeros.

Thus, if you need to enter 28000 in the program you would simply enter 28e3. This means 3 zeros after 28. You can see below how to write the code. It will be easy for you to understand. Both shorthand and longhand are shown.

/* Shorthand */
var myVar = 1e8;
/* Longhand */
var myVar = 100000000;

2. Increase or decrease the value

In programming you usually must specify everything to raise the value of something. E.g.: To add 1 to i we write,

i = i + 1;

But there is also an abbreviation for JavaScript. This can be easily done by just using two plus(+) signs after it.

That is, in that case, write

i+;

Similarly, subtracting 1 from j we would normally write,

j=j-1;

But in short you can write this matter like this,

j-;

You can see below how to write the code. It will be easy for you to understand. Both shorthand and longhand are shown.

/* Shorthand */
i+;
j-;
/* Longhand */
i=i+1;
j=j-1;

But it is not commonly used. It is used only when a loop function occurs in a program.

3. Add, subtract, multiply, divide

JavaScript also has some abbreviations for addition, subtraction, multiplication and division. And it is the same as raising or lowering the normal value.

Suppose a variable i is added to by 5, j is subtracted by 3, k is multiplied by 10, or l is divided by 2. In that case, you can use the following abbreviations. Both shorthand and longhand are shown.

/* Shorthand */
i+=5;
j = 3;
k*=10;
l/=2;
/* Longhand */
i=i+5;
j=j-3;
k=k*10;
l=l/2;