Monday, 27 March 2017

Basic Information And How To Get Started With JavaScript

Definition And How To Get Started With JavaScript

Hi, guys welcome to 360GpTech - World Of Tech.

Today, we're gonna start with the meaning of javascript and how to be a professional in dealing with this PROGRAMMING LANGUAGE called JAVASCRIPT.

Before we proceed to anything, I'd like to give you one quote, which is: "Never Think That You Can Never Be The Best In The Game, Since Too Many People Are In It"

You can take GOOGLE  as a very clean and clear of this quote.
YAHOO has been in existence before the commensation of GOOGLE, but take a clean and clear look at it today, Google has rose up to be the TOP 1, in which they can never come down, except the owner of heaven and earth 'GOD' wish to bring them down.
Apart from that; these TEAM can never come down.

So Keep your faith active that you can! while flowing with us in this tutorial..

I'd like us to start with the meaning of what JAVASCRIPT itself means.

What is JavaScript?

Javascript is a dynamic computer programming language. It is lightweight and
most commonly used as a part of web pages, whose implementations allow
client-side script to interact with the user and make dynamic pages. It is an
interpreted programming language with object-oriented capabilities.

JavaScript was first known as LiveScript, but Netscape changed its name to
JavaScript, possibly because of the excitement being generated by Java.

JavaScript made its first appearance in Netscape 2.0 in 1995 with the
name LiveScript. The general-purpose core of the language has been
embedded in Netscape, Internet Explorer, and other web browsers.


The ECMA-262 Specification defined a standard version of the core JavaScript
language.


THINGS TO KNOW ABOUT JAVASCRIPT

- JavaScript is a lightweight, interpreted programming language.
- Designed for creating network-centric applications.
- Complementary to and integrated with Java.
- Complementary to and integrated with HTML.
- Open and cross-platform.



Client-Side Of JavaScript

Client-side JavaScript is the most common form of the language. The script
should be included in or referenced by an HTML document for the code to be
interpreted by the browser.
It means that a web page need not be a static HTML, but can include programs
that interact with the user, control the browser, and dynamically create HTML
content.

The JavaScript client-side mechanism provides many advantages over traditional
CGI server-side scripts. For example, you might use JavaScript to check if the
user has entered a valid e-mail address in a form field.

The JavaScript code is executed when the user submits the form, and only if all
the entries are valid, they would be submitted to the Web Server.

JavaScript can be used to trap user-initiated events such as button clicks, link
navigation, and other actions that the user initiates explicitly or implicitly.


Does Javascript has Advantages?? Yes It Has


What Are The Advantages of JavaScript

The merits of using JavaScript are:

- Less server interaction: You can validate user input before sending the
page off to the server. This saves server traffic, which means less load on
your server.

- Immediate feedback to the visitors: They don't have to wait for a
page reload to see if they have forgotten to enter something.

- Increased interactivity: You can create interfaces that react when the
user hovers over them with a mouse or activates them via the keyboard.

Richer interfaces: You can use JavaScript to include such items as dragand-
drop components and sliders to give a Rich Interface to your site visitors.



What Are The Limitations of JavaScript

We cannot treat JavaScript as a full-fledged programming language. It lacks the following important features:

- Client-side JavaScript does not allow the reading or writing of files. This
has been kept for security reason.

- JavaScript cannot be used for networking applications because there is no
such support available.

- JavaScript doesn't have any multithreading or multiprocessor capabilities.
Once again, JavaScript is a lightweight, interpreted programming language that
allows you to build interactivity into otherwise static HTML pages.


JavaScript Development Tools
One of major strengths of JavaScript is that it does not require expensive
development tools. You can start with a simple text editor such as Notepad on your Computer.
Since it is an interpreted language inside the context of a web browser, you
don't even need to buy a compiler.

To make our life simpler, various vendors have come up with very nice
JavaScript editing tools. Some of them are listed here:

- Microsoft FrontPage: Microsoft has developed a popular HTML editor
called FrontPage. FrontPage also provides web developers with a number
of JavaScript tools to assist in the creation of interactive websites.

- Macromedia Dreamweaver MX: Macromedia Dreamweaver MX is a
very popular HTML and JavaScript editor in the professional web
development crowd. It provides several handy prebuilt JavaScript
components, integrates well with databases, and conforms to new
standards such as XHTML and XML.

- Macromedia HomeSite 5: HomeSite 5 is a well-liked HTML and
JavaScript editor from Macromedia that can be used to manage personal
websites effectively.


Where is JavaScript Today?

The ECMAScript Edition 5 standard will be the first update to be released in over
four years. JavaScript 2.0 conforms to Edition 5 of the ECMAScript standard, and
the difference between the two is extremely minor.

The specification for JavaScript 2.0 can be found on the following site: http://www.ecmascript.org/

Today, Netscape's JavaScript and Microsoft's JScript conform to the ECMAScript
standard, although both the languages still support the features that are not a part of the standard.

JavaScript can be implemented using JavaScript statements that are placed
within the <script>... </script> HTML tags in a web page.

You can place the <script> tags, containing your JavaScript, anywhere within
you web page, but it is normally recommended that you should keep it within
the <head> tags.

The <script> tag alerts the browser program to start interpreting all the text
between these tags as a script. A simple syntax of your JavaScript will appear as
follows.
<script ...>
JavaScript code
</script>


The script tag takes two important attributes, which are:
- Language: This attribute specifies what scripting language you are using.
Typically, its value will be javascript. Although recent versions of HTML
(and XHTML, its successor) have phased out the use of this attribute.

- Type: This attribute is what is now recommended to indicate the scripting
language in use and its value should be set to "text/javascript".

So your JavaScript syntax will look as follows.
<script language="javascript" type="text/javascript">
JavaScript code
</script>


Writing Your First JavaScript Code

Let us take a sample example to print out "Hello World". We added an optional
HTML comment that surrounds our JavaScript code. This is to save our code
from a browser that does not support JavaScript. The comment ends with a "//--
>". Here "//" signifies a comment in JavaScript, so we add that to prevent a
browser from reading the end of the HTML comment as a piece of JavaScript
code. Next, we call a function document.write which writes a string into our
HTML document.


Guys!! Thats all for today. We'll continue with WRITING JS SYNTAX. If you have any question, or questions, kindly make use of the comment box below, we'll reply you immediately.

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