JavaScript

1
JavaScript

• Jons Head, W3Schools

2
What is JavaScript?

• JavaScript was designed to add interactivity to
  HTML pages
• A JavaScript consists of lines of executable
  computer code
• A JavaScript is usually embedded directly into
  HTML pages

3
If I know JavaScript do I know Java or visa versa?

• No
• Similar
• Syntax based off C
• Both object oriented
• Different
• Different Objects
• Java is compiled
• Marketing ploy by Netscape people

4
What can JavaScript do?

• JavaScript gives HTML designers a programming
  tool
• JavaScript can put dynamic text into an HTML page
  
• JavaScript can react to events
• JavaScript can read and write HTML elements
• JavaScript can be used to create cookies

5
Where to put the JavaScript in my html code?

• Inside the head tag
• Between Script tags
• lthtmlgt
• ltheadgt
• ltscript typetext/javascriptgtlt/scriptgt
• ltscript typetext/javascript src /gt
• lt/headgt
• lt/htmlgt

6
Popup Messages

• alert (..)
• confirm(.)
• prompt (, default value)

7
How do I make a button or text box?

• ltinput typebutton valueThis is a buttongt

8
Events

• onclick
• ondblclick
• onmouseover
• onmouseout
• onload

9
The DOM

• HTML is a Tree! (this has to be a test question)
• The DOM is a way for you to Walk the tree
• DOM Document Object Model

10
DOM made Easy

• document.getElementById (id)