Object programming

1
Object programming
Method
Properties
2
top.hidden
cart.html with the following functions 1.addcart(
desc, price) 2.additem(desc, price,
itemcnt) 3.viewcart() 4.prtitem(where) 5.delitem(
itemcnt)

• jackson.html with the following buttons
• Place order
• View order

top.main
Jackson electronic example
3
Shopping cart logic

• cart.html is always accessible in top.hidden
  frame
• jackson.html is displayed in top.main frame
• When the Place Order button is clicked, the
  addcart function is called, passing along the
  product description and price from the order
• The addcart function will call the additem
  function to store the description, price, and
  current count of the item onto the shopping cart
  ? an alert message is issued as confirmation that
  the additem function is successfully executed ?
• Steps 3 and 4 will be repeated until the user
  clicks the View Order button which triggers the
  viewcart function
• The viewcart function will display the content of
  the cart object in top.main frame as a table by
  calling the display method of the cart object ?
  prtitem function with a delitem function link

4
top.hidden
cart.html with the following functions 1.additem(
desc, price, itemcnt) 2.delitem(itemcnt) 3.addcart
(desc, price) 4.prtitem(where) 5.viewcart()
banner.html with image map banner.jpg
brkfst.html
lunch.html
dinner.html
top.main
Kelseys Diner example
5
Shopping cart logic

• cart.html is always accessible in top.hidden
  frame
• Assume brkfst.html is displayed in top.main frame
• user selected an item off the menu by clicking on
  the Order link which triggers the addcart
  function with its description and price
• The addcart function will call the additem
  function to store the description, price, and
  current count of the item onto the shopping cart
  ? an alert message is issued as confirmation that
  the additem function is successfully executed ?
• Steps 3 and 4 will be repeated until the user
  clicks the View Order link which triggers the
  viewcart function
• The viewcart function will display the content of
  the cart object in top.main frame as a table by
  calling the display method of the cart object ?
  prtitem function with a delitem function link