Introduction to javascript
JavaScript
is the scripting language of the web!
JavaScript
is used in millions of web pages to improve the design, validate forms, detect
browers, create cookies, and much more.
JavaScript
is the most popular scripting language on the internet, and works in all major
browser, such as Internet Explorer, Mozilla, Firefox, Netscape, and Opera.
JavaScript
is easy to learn! You will enjoy it!
What You Should Already Know?
Before you
continue you should have a basic understanding of the following:
·
HTML/XHTML
What is JavaScript?
·
JavaScript is a scripting language
·
A JavaScript consists of line of executable
computer code
·
A JavaScript is usually embedded directly into
HTML pages
·
JavaScript is an interpreted language (means
that scripts execute without preliminary compilation)
·
Every one can use JavaScript without purchasing
a license
Are Jave and JavaScript the same?
NO!
Jave and JavaScript are two completely different languages
in both concept and design!
Jave (developed by Sun Microsystems) is a powerful and much
more complex programming language-in the same category as C and C++.
What can a JavaScript Do?
·
JavaScript
give HTML designers a programming tool – HTML authors are
normally not programmers, but
JavaScript is a scripting language with a very simple syntax! Almost anyone can put small
“snippets” of code into their HTML pages.
·
JavaScript
can put dynamic text into an HTML page – A JavaScript statement like this: document.
write (“<h1>” + name + “</ht>”) can write a variable text into an
HTML page
·
JavaScript
can react to events – A JavaScript can be set to execute when something
happens, like when a page has finished loading or when a user clicks on an HTML
element.
·
JavaScript
can read and write HTML elements – A JavaScript can read ad change the
content of an HTML element.
·
JavaScript
can be used to validate data – A JavaScript can be used to validate form
data before it is submitted to a server. This saves the server from extra
processing.
·
JavaScript
can be used to detect the visitor’s browser – A JavaScript can be use to
detect the visitor’s browser, and – depending on the browser – load another
page specifically designed for that browser.
·
JavaScript
can be used to create cookies – A JavaScript can be used to store and
retrieve information on the visitor’s computer.
