INF 286

Assignment #12

Instructor Dr. Hongmei Wang

Last Name: First Name:

Grade: 

Comment:

Coding questions. The following question needs your complete HTML code.

Please follow instructions to solve the problems

Please start with       the original code given in each subfolder 

Modify files in the       subfolder without modifying the file names.

Problem 1 (50%): Using JavaScript, create a simple web page that displays a Sales Tax Calculator, which accepts the user input on the sales subtotal and tax rate, and output  the amount of sales tax and total amount of money that the user needs to pay.  

Program Requirements: Your program must be written in JavaScript. In addition, you should follow the specific guidelines below.

The web page displays Sales Tax      Calculator as below. It should include:

two input text boxes for the sales       subtotal and tax rate, and 

two disabled output text boxes for       the sales tax and the sales total

one Calculate button and one Clear       button. 

When the user clicks on the button      Calculate (5%)      , 

(15%) the program validates       each of the input text boxes, including Subtotal and Tax Rate, and gives       an alert dialog about the reason why the input is incorrect if any of the       input is incorrect. Each of the input is required and should be numeric       and greater than 0. 

(15%) If both input are valid,       the text box for Sales Tax and Total will display the amount of sales tax       and sales total respectively.

(15%) When the user clicks      on the button Clear (5%), all the textbox are set to empty (10%).      

• Others:

Please start with       the original code given in the subfoler sales_tax 

• Modify files in       this subfolder without modifying the file names.

Problem 2 (50%): Using JavaScript, create a simple web page that displays a Change Calculator, which allows the user to enter amount of change due (0 – 99) in cents, and output the number of each type of coins as change.   

Program Requirements: Your program must be written in JavaScript. In addition, you should follow the specific guidelines below.

The web page displays Change      Calculator as below. It should include:

One input text box for the amount of       change due in cents, and 

Four disabled output text boxes for       the number of quarters, dimes, nickels and pennies. 

one Calculate button. 

When the user clicks on the button      Calculate (5%),      

(15%) the program validates       each of the input text box, and gives an alert dialog about the reason       why the input is incorrect if the input is incorrect. The input is       required and should be numeric and greater than 0. 

(30%) If the input       correct, the four output text boxes will display the number of four       different types of coins. Hint: Instruction       about how to calculate the number of different coins: 

The number of quarters = parseInt(input / 25)

• input_dime = input%25

The number of dimes = parseInt(input_dime/10)

input_nickels = input_dime%10

• The number of nickles =        parseInt(input_nickles/5)
• The number of pennies = input_nickles % 5
• Others:
• Please start with       the original code given in the subfoler change_maker 
• Modify files in       this subfolder without modifying the file names.