Note 4 for Web Scripting

Watch & Read:

Array is a variable on steroids. (Array's have several values under the same variable name.) You have to declare an array!

var mynewarray= new Array()

mynewarray[0], mynewarray[1],mynewarray[2] Notice the array number starts with 0.

Conditional Statements (Javascript's method of testing the environment)

• if statement - use this statement if you want to execute some code only if a specified condition is true
  
  Syntax
  

  if (condition)
  { code to be executed if condition is true }
  

• if...else statement - use this statement if you want to execute some code if the condition is true and another code if the condition is false
  
  Syntax
  

  if (condition)
  { code to be executed if condition is true }
  
  else
  { code to be executed if first condition is not true }
  

• if...else if....else statement - use this statement if you want to select one of many blocks of code to be executed - Note: You may want to use Switch if you have more than 3 conditions
  Syntax
  

  if (first_condition)
  { code to be executed if condition is true }
  
  else if (second_condition)
  { code to be executed if first condition is not true and this conditon is true}

  else
  { code to be executed if 1st & 2nd condition is not true }
  

• switch statement - use this statement if you want to select one of many blocks of code to be executed

switch(n) {

case 1:

execute code block 1

break

case 2:

execute code block 2

break

default:

code to be executed if n is different from case 1 and 2

}

Flow Charts help you define your logic!

Terms you need to Lookup:

Flow Charts, Conditional Statements, if else, switch, Function, Operators and Argument

Review the following:

Logical Operators

Homework:

Read Chapter 3

Reminder: Post on the Discussion Board Section at least one URL of a Web Page that uses a Web script and describe how the script works.

Final Step:

Imagine that your mind is a DVD recorder / player and you can review this content anytime you want.  I want you to close your eyes and quickly review in your mind everything we covered in class. 

I also want you to review everything we covered before you go to bed because I want your mind to process this information while you sleep.  You don’t need to spend much time on this review, 5 minutes will be enough!