Transcript Beginning JavaScript

Beginning JavaScript
4th Edition
Chapter 1
Introduction to JavaScript
and the Web
Chapter 1 Objectives
 What is JavaScript?
 What do you need in order to use
JavaScript?
 What can JavaScript do for you?
What is JavaScript?
 A computer language: a series of
instructions that tell the computer to
do something
What is JavaScript?
 An interpreted language rather than a
compiled language
What is JavaScript?
What is JavaScript?
 JavaScript is interpreted when the
code is run.
This interpretation has to be repeated
every time the code is run.
What is JavaScript?
 JavaScript is not Java
What do you need?
All you need to create and use
JavaScript is:
• A text editor, such as Notepad
• A Web browser, such as Firefox (FF)
or Internet Explorer (IE) to view your
pages in
What can JavaScript do for you?
 Add interactivity to your Web pages
 Help you obtain information from
visitors to your Web site
 Enable you to validate the
information you receive
Adding JavaScript to your pages
 Insert JavaScript code in
HTML/XHTML pages between an
opening and closing script tag:
<script>
</script>
Adding JavaScript to your pages
 It’s good practice to include a type
attribute in the opening script tag:
<script type="text/javascript">
Adding JavaScript to your pages
 <script type="text/javascript">
</script>
Adding JavaScript to your pages
 <script type="text/javascript">
document.bgColor="RED";
</script>
Adding JavaScript to your pages
 <script type="text/javascript">
// script block 1
document.bgColor="RED";
</script>
Using JavaScript
JavaScript enables you to
make your Web pages