ProductReview Example

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

Functionality

To have an example AJAX application to share assessments about known items .

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

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

Development

Designing the tables

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.

Using the AJAX Library

Fetch the library from : http://www.dataaccess.nl/IframeText.asp?pageid=1378 install it

• Right click in the class palette in VDF12.
• press "add/remove libraries".
• press "Add Library"
• navigate to where you installed the VDF AJAX library. I installed mine in "c:\programmer\Visual DataFlex AJAX Library 1.0" .
• click on the sws file for the AJAX library
• choose "yes" for relative pathing
• chose "OK"

Creating a AJAX Web application

• choose create new
• select AJAX Web Project
• Select "Rating" as Web Application name
• enter OK

AJAX Session management

users logging in

• choose create new
• select "Web Object"
• select "AJAX Session Manager"
• Write "SessionManager" as Object name

AJAX Masterdetail

Listing user assements for items