XAML/C# to HTML5/JS
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This document discusses transitioning from XAML/C# to HTML5/JavaScript using the Knockout library. It explains that while HTML5/JS doesn't natively support features like MVVM, Knockout provides data binding, collections, commands and other features to emulate the MVVM pattern. A comparison is made between XAML and Knockout, and the presenter encourages attendees to experiment with Knockout on their own to become more comfortable with the transition.
![Knockout collections
Like ObservableCollection<T>
public Employees: KnockoutObservableArray<Employee> = ko.observableArray([]);](https://image.slidesharecdn.com/xaml2html-140701024420-phpapp01/85/XAML-C-to-HTML5-JS-17-320.jpg)
![Knockout context binding
Similar to relative source or element binding:
$parent - $parent[indexer]
$root
$element](https://image.slidesharecdn.com/xaml2html-140701024420-phpapp01/85/XAML-C-to-HTML5-JS-21-320.jpg)
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XAML/C# to HTML5/JS
- 1. © Copyright SELA software & Education Labs Ltd. | 14-18 Baruch Hirsch St Bnei Brak, 51202 Israel | www.selagroup.com SELA DEVELOPER PRACTICE JUNE 29 – JULY 3, 2014 Michael Haberman From XAML / C# to HTML5 / JS
- 2. How to transition??? Don’t be scared Lets take our knowledge and experience to HTML JS Mainly MVVM
- 3. The difference Lots of libraries (AngularJS,Jquery, BackBone, Knockout) Doesn’t compile Doesn’t have MVVM Features
- 4. Lots of libraries – 20 MVVM Frameworks ?!
- 5. The difference Lots of libraries (AngularJS,Jquery, BackBone, Knockout) Doesn’t compile Doesn’t have MVVM Features
- 6. Type Script – lets make it compile! Compiles your Javascript Code!! Compile time errors Intellisense
- 7. The difference Lots of libraries (AngularJS,Jquery, BackBone, Knockout) Doesn’t compile Doesn’t have MVVM Features
- 8. What MVVM Feature do we want? Data Binding Converter Mode INotifyPropertyChanged Command Passing a parameter Context Binding
- 9. Comparison XAML Knockout Property changes Implement INotfiyPropertyChanged Use KnockoutObservable Collection changes Implement INotifyCollectionChanged Use KnockoutObservableArray Command Implement ICommand Access any method Convert data Converter Computed Binding Inline logic X V Collection Iterate ItemsControl using DataTemplate Foreach binding using template Access parent/root ViewModel Relative binding using RelativeSource $parent / $root Access another UI Element ElementBinding $element
- 10. Demo Lets see how to setup the environment
- 11. Setting DataContext Knockout C# var vm = new MySampleAPP.MainViewModel() ko.applyBindings(vm); DataContext = new MainViewModel();
- 12. Binding an element XAML <TextBlock Text="{Binding FirstName}"/> Knockout <input type="text" data-bind="value: FirstName"/>
- 13. Visibility bound to ViewModel KnockoutXAML data-bind="if: HasLoggedinUser” OR data-bind="visible: Status() == 'Working'" Visibility="{Binding HasLoggedinUser, Converter={StaticResource Converter}}"/>
- 14. Commands XAMLKnockout <Button Command="{Binding ChangeUser}"/><input type="button" data-bind="click: ChangeUser, valueUpdate:'input'"/>
- 15. Update Options XAML Knockout Default Afterkeydown PropertyChanged Keyup LostFocus Keypress Explicit Input Change
- 16. Iterate through collections - XAML <ItemsControl ItemsSource="{Binding Collection}" > <TextBlock Text="{Binding Name}"/> </ItemsControl>
- 17. Knockout collections Like ObservableCollection<T> public Employees: KnockoutObservableArray<Employee> = ko.observableArray([]);
- 18. Iterate thought collections - Knockout <table data-bind="if: HasLoggedinUser"> <tbody data-bind="foreach: Employees"> <tr> <td><span data-bind="text: Name"></span></td> </tr> </tbody> </table>
- 19. New style converters Another way to update the UI via ViewModel’s Logic self.SalaryState = ko.computed(() => { … return “red”; }); <span data-bind="text: Salary, style: { color: SalaryState()}" ></span>
- 20. Context binding - Knockout Within foreach access to ViewModel and passing the current item as parameter <input type="button" value="Delete" data-bind="click: $parent.DeleteEmployee" />
- 21. Knockout context binding Similar to relative source or element binding: $parent - $parent[indexer] $root $element
- 22. Comparison XAML Knockout Property changes Implement INotfiyPropertyChanged Use KnockoutObservable Collection changes Implement INotifyCollectionChanged Use KnockoutObservableArray Command Implement ICommand Access any method Convert data Converter Computed Binding Inline logic X V Collection Iterate ItemsControl using DataTemplate Foreach binding using template Access parent/root ViewModel Relative binding using RelativeSource $parent / $root Access another UI Element ElementBinding $element
- 23. The difference Lots of libraries (AngularJS,Jquery, BackBone, Knockout) Doesn’t compile Doesn’t have MVVM Features
- 24. Summary HTML5 + JS + Knockout isn’t scary! Knockout provide an easy transition for XAML developers Go home and try it your self!
- 25. Questions