Beginning JavaScript 4 th 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?

 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:

Adding JavaScript to your pages  It’s good practice to include a type attribute in the opening script tag:

Adding JavaScript to your pages 

Adding JavaScript to your pages  document.bgColor="RED";

Adding JavaScript to your pages  // script block 1 document.bgColor="RED";

Using JavaScript JavaScript enables you to make your Web pages