tutorial

Making Web Programming Simpler:a Seaside TutorialAlexandre BergelLERO & DSG, Trinity College Dublin, IrelandAlexandre.Bergel@cs.tcd.ieNovember 15, 20061 RegConf: An Application for Registering to aConferenceThe goal of this tutorial is to give you a feeling on creating a web applica-tion using Seaside. ConfReg is a tool intended to help people to register to aconference.Four step are necessary to complete such a registration:1. A participant has to enter some personal data such as firstname, name,the institute where she is attached, and her email address. Then,2. Some information about the hotel are required. For instance a room canbe single or double in an hotel ranked between 1 and 4 stars. A price hasthen to be computed.3. Finally informations regarding the payment are required. Once the creditcard number, the issue date, and the type are entered,4. A confirmation screen shows a summary of what was entered.The flow of the application is described in the following figure.IsolationyesGet personal Get Payment Show Get hotel infoinfo info Confirmationnois card number valid ?1The dashed rectangle designate the part of the application which is isolated.This means that once the flow of the running application leaves this box, thereis no way to come back in it, specially using the back button.2 Application Building Blocks2.1 The Entry Point: ConferenceRegistrationThe control flow of the application has to be described in a task’s go method.This ...