ProductReview Example

Here I will build a example application using the VDF Ajax library and note the steps taken underway.

Functionality

The overall goal is to be able to see what users think about a particular item.

To accomplish this, then users should be able to:

• login
• create a user account
• choose an item from a list
• enter information about a known item
• supply a rating of an item

The system should be implemented as a web application, showcasing the possibilities in the VDF AJAX library.

Using the framework

The AJAX Rating example will build upon functionality allready present the following examples:

• AJAX Contact Management
• AJAX Order Entry

The overlapping functionality is described in:

• Using DataDictionaries
• Using the AJAX Library
• Using cAjaxSessionManager
• Creating a AJAX Web application
• Creating a AJAX Form

From here on I will describe functionality specific to this example

Application design

Table layout

We want to store information about users, places, purchases and known items. A user should be either a normal user or an administrator. The other tables should hold sufficient information about the items purchased and how the users liked them.

Create these tables in the database builder and create the associated data dictionaries.

The following data dictionaries should now be available:

• Item_DataDictionary
• Place_DataDictionary
• Purchase_DataDictionary
• Rating_DataDictionary
• UserInfo_DataDictionary

Creating the webapp

Session management

extending the following in cAjaxSessionManager:

• UserLogin: checking if the supplied password is correct
• HasRights: does the logged in user have the rights to perform the chosen function?

Creating the Web Objects

• item.wo : handling information about items
• userinfo.wo : handling information about users
• place.wo: handling info about places

Problems

• AJAX Updating Related forms