Slide 12.12: JavaScript switch statement

Slide 12.11: JavaScript if...else statements
Slide 12.13: JavaScript popup boxes
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JavaScript switch Statement

Conditional statements are used to perform different actions based on different conditions. Use the switch statement to select one of many blocks of code to be executed. The list below shows how the switch works:

 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
 }

A single expression n (most often a variable) is evaluated once.

The value of the expression is then compared with the values for each case.

If there is a match, the block of code associated with that case is executed.

Use break to prevent the code from running into the next case.

The object Date includes the following methods

getDay( ), which gets the day of the week as a value from 0 to 6,

getDate( ), which gets the day of the month as a value between 1 and 31, and

getMonth( ), which returns the month from the date object as a value from 0 through 11.

Demonstration
The following demonstration shows how the script of HTML and JavaScript is displayed on the Web.


<html> <body> <script type="text/javascript"> var number = prompt( "Please a number:", "3" ); switch ( number ) { case "1": document.write( document.cookie ); break; case "2": document.write( document.domain ); break; case "3": document.write( document.location ); break; case "4": document.write( document.referrer ); break; case "5": document.write( document.security ); break; case "6": document.write( document.title ); break; case "7": document.write( document.URL ); break; case "8": document.write( document.fileSize ); break; default: document.write( document.protocol ); } </script> </body> </html>

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Slide 12.11: JavaScript if...else statements
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