Uploaded byBoyan Mihaylov
The AngularJS way
The document presents an overview of AngularJS, highlighting its benefits for handling complex clients and its use of the MV* pattern. Key components discussed include modules, controllers, directives, filters, and services, detailing their roles and functionalities within an AngularJS application. The content also emphasizes the significance of dependency injection and the structure of scopes in efficiently managing the application state.
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The AngularJS way
- 1. The AngularJS way Boyan Mihaylov, Ebita
- 2. Agenda • WhyAngularJS? • Hello, world • How does it work? • Foundation: the basic components • Real-case scenario development 2
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- 4. Why AngularJS? •Need to handle complex clients • jQuery is too low-level • MV* pattern on the client • No DOM operations • Data models are POJO • Huge community • 64 920+ questions on Stack Overflow • 11 701+ questions on Google Groups 4
- 5. Hello, World! Texteditor Browser directives data binding 5
- 6. Bootstrapping <html ng-app> <body> {{expression}} </body> </html> Root scope Template Model 6
- 7. Scopes • Theglue between the view and the controller • A tree structure of objects • One root scope created per application • Every new scope is created from an existing one • Created automatically by AngularJS • Default creation is by prototypically inheritance 7
- 8. Scopes: prototypical inheritance $rootScope .say = function() { … }; $scopeA $scopeB $scopeB1 .hey = function() { … }; 8
- 9. How does itwork? 1. Trigger key press event 2. Call $scope.$apply(“name = ‘Wo’”) 3. Call $scope.$digest() 1. Check for dirty items in the watch list 2. Repeat until there are no dirty items, max 10 times 4. Make the browser repaint the bound regions 9
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- 11. Modules (1) •Module-first approach • Separation of concerns • Plug and play • Dependencies 11
- 12. Modules (2) Pointerto the module Module name An array with possible dependencies Retrieve a module by its name 12
- 13. Modules (3) •ng-app may contain the name of the main application module Must refer to an existing module Defines a module 13
- 14. Modules (4) •Two phases when initializing a module Module .config(…) .run(…) .config(…) .run(…) Configure the services before they are used. Services can be used here and cannot be reconfigured anymore 14
- 15. Modules (5) •Modules can further define other components .controller(…) .directive(…) .filter(…) .factory(…) .service(…) .provider(…) .value(…) .constant(…) Module .controller(…) .directive(…) .filter(…) .factory(…) .service(…) .provider(…) .value(…) .constant(…) 15
- 16. Controllers • Containapplication-specific logic • Communicate with services • Should NOT manipulate the DOM • Assigned via ng-controller • Has own scope • Can have dependencies 16
- 17. Dependency injection •Names define the instances to be injected • Implicit annotation 17 • Inline array annotation Can be renamed during minimization
- 18. Directives • Encapsulatecomponent logic • Have access to the HTML element • Can have own scope (or reuse parent’s one) • Can have dependencies 18
- 19. Directive attachment Attribute CSS Class 19 HTML element Comment
- 20. Built-in directives •ng-app – creates and initializes an AngularJS application • ng-model – associates a model with an input field • ng-click – executes a function when the user clicks on an element • ng-show – shows or hides an element based on an expression • ng-repeat – repeats a HTML element for a given input array of models 20
- 21. Filters • Formatsthe value of an expression • Used in binding expressions – {{ expression | myFilter }} • Chaining of multiple filters – {{ expression | filter1 | filter2 }} • Can also be injected in controllers and directives 21
- 22. Services • Containyour client-side business logic • Lazy initialized • Singletons • 5 types • Provider • Service • Factory • Value • Constant 22
- 23. Services: provider (1) • The core service • The others are just syntactic sugar on top of it • Implements the factory method design pattern 23
- 24. Services: provider (2) • Must provide a $get method that returns the service instance • Can contain dependencies • Can be configured during the configure phase • Injected as configurable providers during the configure phase • Injected as service instances elsewhere 24
- 25. Services: factory andservice • Can contain dependencies • Bigger control over the instance initialization • You get the value, returned from the provided function • Can contain dependencies • Produces a service by invoking a constructor with the new operator • You get a new instance of the provided function 25
- 26. Services: value andconstant • Cannot contain dependencies • Values are the simplest services • Their values can be changed • Constants can be injected during the configuration phase • Their values cannot be changed once assigned 26
- 27. Let’s get ourhands dirty 27 https://github.com/omeganet/The-Book-Rat/
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- 29. Thank you! BoyanMihaylov bm@ebita.dk