Web systems day 04-Topic: JavaScript

JavaScript Popup Boxes
JavaScript has three kind of popup boxes: Alert box, Confirm box, and Prompt box

1. An alert box is often used if you want to make sure information comes through to the user.
2. A confirm box is often used if you want the user to verify or accept something.
3. A prompt box is often used if you want the user to input a value before entering a page.

The following shows an example of an alert box.

The following shows an example of a confirm box.

The following shows an example of prompt box.

JavaScript Functions

Calling a Function with Arguments

Functions With a Return Value

JavaScript For...In Statement

JavaScript onMouseOver Event

The try...catch Statement
The try...catch statement allows you to test a block of code for errors. The try block contains the code to be run, and the catch block contains the code to be executed if an error occurs.

References

1. Wendy Willard (2010). Web Design DeMYSTiFieD. McGraw-Hill Osborne Media
2. http://www.w3schools.com/ accessed date 20 June 2012