Implementation We are now familiar with the requirements
Implementation We are now familiar with the requirements and important design issues of the shopping cart application. It is a good time to walk through the code. This section assumes that the readers are familiar with the WML syntax. Let’s first look at the application screenshots. This will help us in understanding the code better. Import To run the application from your PC, you will have to use a phone simulator. I ant used UP Simulator for testing the application, available from http://developer.phone.com/download/index.html. This is the main page of the application. From here, the existing users can go to the login screen, or new users can register themselves. To register, new users enter their name, user id, password, address, and credit card details. The user will be presented with a series of input forms (one per screen) for entering these details. The above screenshot is the first screen where the user enters their first name. In WML all the input forms cannot be displayed in one screen because of the display size limitations of the mobile devices. If the registration is successful then the following page is displayed, else an error message is displayed. The user can go to the login page, by selecting the Login page link: To login to the site the user enters their user id and password. If the authentication succeeds, then the main page of the application is returned: The adjacent screenshot is the main page of the application. When the user chooses Search they are shown a screen describing the search functionality of the application. The user should select the soft link OK to go to the next screen: The adjacent screenshot is the first input screen of the search menu. Here the user enters the search text, and presses the soft link OK to go to the next screen. Next, the user selects the search criteria and selects OK. Now the search request is sent to the server: The adjacent screenshot displays the search results. The user can select the link to view the details of the item: The above screenshot displays the details of the searched item. The user can either add the item to his cart by selecting the soft link ADD, or can go back to the earlier screen (Search Results) by selecting the soft link BACK. The user can then either view the details of the added item by selecting its link, or can view the contents of the cart by selecting the Display Cart link, or can go to the main page of the application by selecting the soft link HOME: The above screenshot displays the contents in the user’s cart. The user can view the details of an item by selecting the appropriate link. From here, the user can either change the quantity of this item by selecting the soft link CHG, or go back to the earlier (display cart) screen by selecting the BACK soft link: The above page is displayed when the user goes to the check out. From here, the user can either view the shipping address details by selecting the Address Details link, or can view their credit card details by selecting Credit Card Detailslink, or can go to the home page of the application: Page 553
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