A Smooth Transition to HTML5 Using MVVM
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A Smooth Transition to HTML5 Using MVVM

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How difficult is it to port Silverlight applications to HTML5? That is the question we hear every day at ComponentOne. Instead of speculating about it, we decided to sit down and try it. Today we will ...

How difficult is it to port Silverlight applications to HTML5? That is the question we hear every day at ComponentOne. Instead of speculating about it, we decided to sit down and try it. Today we will discuss the process and tools we used when doing so. The approach we took was to use the MVVM pattern (from Silverlight) when developing the HTML5/JavaScript version. By choosing this method we were able to port our data access and UI layers quite easily. We take advantage of tools like KnockoutJS and Wijmo to make the process even easier. Our developers were able to minimize the cost of learning new paradigms in this migration by reusing most of their knowledge. What we ended up with was nearly identical applications in Silverlight and HTML5. Come learn how you can smoothly transition to HTML5!

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  • Complete kit of UI widgets for HTML5 and jQuery developmentUnmatched Data Visualization  and Grid componentsHandcrafted CSS3 Themes and infinite possibilities  with ThemerollerWorks everywhere – devices and browsers supported40+ jQuery UI Widgets
  • Design the View (general appearance and behavior of the application)Design the ViewModel to support the ViewImplement the ViewModelImplement the View

A Smooth Transition to HTML5 Using MVVM A Smooth Transition to HTML5 Using MVVM Presentation Transcript

  • A SmoothTransition toHTML5Using MVVMDevelopment Patterns
  • About: meChris Bannon@b4nn0nchrisb@wijmo.com
  • Wijmo• 40+ Widgets• Built on jQuery UI• Powered by HTML5• Themed with Themeroller• Supports MVVM
  • About: session• Philosophical (warning: lot’s of talking)• Share our approach on porting to HTML5 – General guidelines – Tools – Pitfalls• Show some code!
  • Real WorldExamples
  • Why UseHTML5?“Virtually everycomputing devicesupports HTML andJavaScript”
  • Benefits of UsingHTML5• Mobile• Performance• Shared code in multiple platforms – Mobile Web – Native Mobile (PhoneGap) – Desktop Web – Native Desktop (Win8)
  • Principles WhenMigrating to HTML5• Port your programming knowledge• Port your patterns & practices• Port your code conventions• Port your business logic, not your code
  • How to Migrateto HTML5
  • How Can You Portto HTML5?Use a familiar development pattern: MVVM – Widely used by Silverlight developers – Use Knockout for MVVM in JavaScript – Use UI controls with MVVM support for quicker development
  • What is MVVM?• Model – Data for an application – Example: Web service• ViewModel – Pure code representation of UI Model – Example: JavaScript Class or Object• View – Visible and Interactive UI – Example: HTML, CSS & JavaScript UI
  • ExampleViewModel Usagevar myViewModel = { personName: ko.observable(Bob), personAge: ko.observable(123)};ko.applyBindings(myViewModel);<span data-bind="text: personName"></span>
  • MVVM ExamplesUsing Knockout forMVVM in JavaScript
  • Porting the ModelUse the same Model/Datasource – Most JavaScript apps can use the same services
  • Porting theViewModelPort the ViewModel – Create JavaScript Objects/Classes that match their equivalents in C# – Hook up observability using Knockout – Remember to focus on porting business logic, not code
  • Porting the ViewPort the View – Create HTML markup that represents your UI (similar to what you have in XAML) – Add data-bind attributes to bind markup to the View-Model – Use data-bind attributes to turn markup into UI Controls (like jQuery UI widgets)
  • The Benefits ofUsing MVVM
  • ShorterDevelopment Cycles• MVVM separates development clearly between Data, Code and UI• Each layer can be developed in parallel and individually• Minimizes turnaround time
  • Improved Reliability& EasierMaintenance• ViewModels are testable• ViewModels easily integrate with Unit Tests• Unit Tests become assets to the project during the lifecycle of the application• Maintenance made easier with automated tests
  • More PredictableDevelopment Cycles• Our steps in development: – Design the View (general appearance and behavior) – Design the ViewModel to support the View – Implement the ViewModel – Implement the View• This allows us to more easily estimate time/cost for each step
  • Improved Quality• Less overlap between developers and designers• Each can focus on their specialty and deliver higher quality• Both can work simultaneously
  • Flexibility• Loose coupling between Views and ViewModels• Multiple Views can use a single ViewModel• Easily make Mobile, Desktop or other custom Views against a single ViewModel
  • Standardization• Use the same binding mechanisms in multiple applications• Once initially developed these assets can be reused in new applications – Markup – Styles – UI Controls – Common Input Forms – Libraries (Globalization, shared functions, etc)
  • ChallengesWhen Porting toHTML5
  • DevelopmentToolsJavaScript development tools are not asmature as Silverlight’s – Compile-time error detection – Code re-factoring – IntelliSense (Code Auto-complete / Suggestions)
  • UI ControlsSilverlight has a wider variety of UI controlsavailable to developers – Only basic elements in HTML to use – Usually need to use a library of UI Controls – More difficult to create controls in HTML than in Silverlight
  • Data AccessSilverlight provides a rich and mature set ofbusiness data tools – No concept of data queries – Rich data features are not native to collections (arrays) – Must use ajax to call services and consume data
  • Questions?
  • Resources• Wijmo MVVM Support http://wijmo.com/widgets/mvvm-support/• Download Wijmo http://wijmo.com/downloads/• Knockout http://knockoutjs.com/• Contact Me @b4nn0n chrisb@wijmo.com
  • Thanks forJoining!