may 16 – 18, 2007 copyright 2007, data access worldwide may 16 – 18, 2007 copyright 2007, data...
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May 16 – 18, 2007 Copyright 2007, Data Access WorldwideMay 16 – 18, 2007 Copyright 2007, Data Access Worldwide
Build Great Web Application 'Fast and Easy'
An Introduction to the Visual DataFlex AJAX Library
Eddy Kleinjan, Data Access Europe, eddy.kleinjan@dataaccess.eu
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
AgendaAgenda
Great Web ApplicationVisual DataFlex AJAX LibraryBuilding AJAX Library Web ApplicationsBasic WebApp
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Great Web ApplicationsGreat Web Applications
Good Graphical User Interface DesignExtended User Interface ControlsFast RespondingEvent DrivenNo Full Page Refresh
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Great Web Application SamplesGreat Web Application Samples
Google Suggest http://www.google.com/webhp?complete=1&hl=en
Backpack http://educ.backpackit.com/
Google Maps http://maps.google.com/?ie=UTF8&t=k&om=1&ll=25.823965,-80.121118&spn=0.003385,0.007135&z=18
Yahoo news http://news.yahoo.com/
May 16 – 18, 2007 Copyright 2007, Data Access WorldwideMay 16 – 18, 2007 Copyright 2007, Data Access Worldwide
Great Web Applications use AJAX to create User Friendly, Responsive,
Interactive Web Sites
May 16 – 18, 2007 Copyright 2007, Data Access WorldwideMay 16 – 18, 2007 Copyright 2007, Data Access Worldwide
What is AJAX?
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Defining AJAXDefining AJAX
Ajax isn’t a technology. It’s really several technologies, each flourishing in its own right,
coming together in powerful new ways. Jesse James Garrett
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Defining AJAXDefining AJAX
AsynchronousJavaScriptAndXMLFirst named by Jesse James Garrett as a project name to help management understand what they were working on.
http://adaptivepath.com/publications/essays/archives/000385.php
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Technologies InvolvedTechnologies Involved
HTMLJavaScriptDocument Object Model (DOM)XMLASP (VBScript)Visual DataFlexWeb ServicesCSS
Source: http://adaptivepath.com/publications/essays/archives/000385.php
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Source: http://www.javarss.com/ajax/j2ee-ajax.html
Asynchronous AJAX Call Yahoo News SampleAsynchronous AJAX Call Yahoo News Sample
May 16 – 18, 2007 Copyright 2007, Data Access WorldwideMay 16 – 18, 2007 Copyright 2007, Data Access Worldwide
Visual DataFlex AJAX Library
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
GoalsGoals
Create Framework for Web Based Database ApplicationsAllow Applications to be build ‘Fast-and-Easy’Windows like ControlsBrowser IndependentHighly IntuitiveData Dictionary Based ValidationsClient Side And Server Side ValidationsStandards Based
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Automated Input ControlsAutomated Input Controls
Input controls are automatically attached to Data Dictionary itemsCharacteristics like data type, length, etc. are loaded from Data Dictionary upon page loadClient side data validation while navigating forward and before sending dataBehavior can be influenced by setting attributes on the input element.
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
No Page ReloadNo Page Reload
Only changed parts of the page are updatedData is send and received in the backgroundUse of Modal Popup Object without opening a new browser window
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Lookup Lists and GridsLookup Lists and Grids
Lists provide a virtual view on a set of dataImplemented as normal HTML tables
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Other ControlsOther Controls
Tabbed Dialogs
Modal Popup Dialogs
Pull Down Menu's
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Data DictionaryData Dictionary
All Meta Data is available at the ClientWhen possible, validations will be done at the ClientServer Validations will always be executed
May 16 – 18, 2007 Copyright 2007, Data Access WorldwideMay 16 – 18, 2007 Copyright 2007, Data Access Worldwide
Samples
May 16 – 18, 2007 Copyright 2007, Data Access WorldwideMay 16 – 18, 2007 Copyright 2007, Data Access Worldwide
AJAX Library Components
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
AJAX Library ComponentsAJAX Library Components
Visual DataFlexData DictionariesWeb Browser ObjectWeb Services
Internet Information ServerHTML (ASP Pages optional)JavaScriptCascading Style Sheets (CSS)
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Client / ServerClient / Server
Client / Server Technology
ServerImplemented as Web Services
ClientJavaScriptCSSXMLHttpRequest Object
ClientServer
WebService
WebBusiness
Object
SessionManager
Optional ASP Calls
.asp page orHTML page
12Build page using ASP
Page is shown3
Meta data is requested4
Meta Data is delivered
AJAX Request
AJAX Response
5
7 Build Data
Structure
6
8
Request page
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
ServerServer
Implemented as Web ServiceExtends the Standard Web Business ObjectsOnly One Web Service Object in an ApplicationWeb Service Passes Calls on to Web Business ObjectsAll calls can be overruled by DeveloperEvents Are Generated for Developer to Augment
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
ClientClient
Implemented as set of JavaScript ClassesGoal: Developer should not have to use JavaScriptDon’t need Active Server Pages (.asp)Control VDF Specific Settings through HTML Attributes
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Page Load ProcessPage Load Process
· Request page · Delivers page (ASP processing when necessary)
· Request Meta Data from Web Object
· Looks up Web Object; Sends back XML document containing Meta Data
· Stores XML Meta data· Processes All Forms· Attaches Attributes to Input Elements
based on Meta Data
Client Server
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Processing a Client RequestProcessing a Client Request
· Performs Client Side Validation· Creates XML Document based on Form
data· Sends Data with Session Key to Server
· Validates Session· Looks up Web Object· Processes Request· Creates XML Document containing
requested data· Processes Request· Updates the Screen
Client Server
May 16 – 18, 2007 Copyright 2007, Data Access WorldwideMay 16 – 18, 2007 Copyright 2007, Data Access Worldwide
How to build
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Create a ‘Workspace’Create a ‘Workspace’
Create a new workspaceAdd the “Visual DataFlex Ajax Library”
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Create SessionManagerCreate SessionManager
Handles security and creation of Session Id’sNew Web Object Ajax Library Session ManagerCall it “oSessionManager”
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Create Web Service InterfaceCreate Web Service Interface
Accepts Incoming CallsNew Web Object Ajax Library Web Service InterfaceCall it “WebService”
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Create Web Browser ObjectCreate Web Browser Object
Functional unitNew Web Object Ajax Library Web Business ObjectAdd Data Dictionary ObjectsTest it
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Create FormCreate Form
Handles ‘one-record-at-a-time’ formsNew Web Markup Ajax Library FormCall it “MyTable.asp”Replace “MyTable” with your details
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
How to get?How to get?
Download at www.dataaccess.eu/ajaxDownloads Visual DataFlex Ajax LibrarySupport: news.dataaccess.nl Libraries AJAX
May 16 – 18, 2007 Copyright 2007, Data Access WorldwideMay 16 – 18, 2007 Copyright 2007, Data Access Worldwide
Basic WebApp
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Basic WebApp DefinitionBasic WebApp Definition
Starting Point for Building Web ApplicationsNo AJAX Required
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Basis Web App ComponentsBasis Web App Components
SessionManagerExtended Data Dictionary
Alternative Auto Increment FunctionRegister Created/Modified Data (when fields supplied)
Translation (Multi Lingual Sites)User Rights Table
Copyright 2007, Data Access WorldwideMay 16 – 18, 2007
Basic WebApp AvailabilityBasic WebApp Availability
Will be made Available to all Conference Attendees
May 16 – 18, 2007 Copyright 2007, Data Access WorldwideMay 16 – 18, 2007 Copyright 2007, Data Access Worldwide
Questions?
May 16 – 18, 2007 Copyright 2007, Data Access WorldwideMay 16 – 18, 2007 Copyright 2007, Data Access Worldwide
Thank you!
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