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Angularjs for kolkata drupal meetup
This document provides an overview of AngularJS, including its history, key features, and how it works. It originated at Google and was open-sourced in 2009. Some key features include two-way data binding, separation of model and view, and being unit testable. It uses MVC architecture with declarative coding. Core concepts covered include directives like ng-app, ng-model, expressions, scopes, controllers, views, filters, routing, and dependency injection.
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- 1. Javascript for Designers Twitter@dgoutam
- 2. History • Origins withinGoogle, invented by Misko Hevery • Open-sourced 2009 • 17,000 lines in 6 months => 1,500 in 3 weeks
- 3. Killer Features • • • • Two-way binding Declarativecoding for UI Teaching HTML new tricks Separation of model & view, No DOM/View manipulation, less code • Great for CRUD based single page apps • Awesome adoption and great community • Unit testable, E2E testable
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- 6. ng-app, expression binding •Include angular.js or angular.min.js • Add ng-app declarative where you want Angular to manage app (typically <html> or <body>) • Expression binding with {{ }} • ng-app can also be written as ngApp • Use camel case in JavaScript code (ngApp) and use snake case in html (ng-app)
- 7. How does itwork • Compile: traverse the DOM and collect all of the directives. The result is a linking function. • Link: combine the directives with a scope and produce a live view.
- 8. ngModel, binding variables •02-ngModel • ng-model binds variable data. It can be declared on input, select, textarea, etc.
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- 11. Differences from jQuery •Declarative code, not imperative (explicitly stating, say with functions, what action needs to be performed) • Automatic data binding • No direct DOM manipulation
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- 13. Expressions • Expressions canbe embedded anywhere • … even for class values • There are special filters that you can use (currency) • Values are automatically bound
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- 16. Learnings • Controller objectscan separate data and functionality – There can be many controllers • ‘$scope’ is injected by AngularJS • $scope.data in the controller is referred to as simply data in html • Dot notation for object members works (person.age) – In fact, this is suggested practice
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- 26. Modules in AngularJS •Third party code can be packaged as reusable modules. • The modules can be loaded in any/parallel order (due to delayed nature of module execution). • Some Angular modules are in separate files: Eg. ngRoute is in angularjs-route.min.js
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- 29. $http • Make AJAXcalls with $http • It returns deferred promises – More in later workshops • You can handle ‘success’ and ‘error’
- 30. Working with angular-seed •https://github.com/angular/angular-seed • You need to have node.js installed to test
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- 33. What we didn’tcover • • • • • Unit testing, E2E testing Custom directives beyond basics $apply and digest cycles $q and promises Service, Factory, Provider
- 34. Resources • • • • • • • angularjs.org Google Groups: AngularJS Google+:AngularJS ngmodules.org Github: angular-ui.github.io Google+: AngularJS India https://www.facebook.com/groups/25576918 4523171/
Editor's Notes
- #3 they start with an anecdote, discussing how they were working on a web application at Google. They have already written 17000 lines of code in about 6 months and it was almost finished, albeit with great frustration related to development speed and testability. This guy, Miško Hevery, tells everyone that by using a framework that he wrote in his spare time (you gotta love devs!) they could rewrite the whole application in two weeks. He was wrong, they did it in three weeks and at the end the whole thing has only 1500 lines of code and was fully testable. 90% less code, in 90% less time. And it was very testable.
- #8 Compiler Compiler is an angular service which traverses the DOM looking for attributes. The compilation process happens into two phases. Compile: traverse the DOM and collect all of the directives. The result is a linking function. Link: combine the directives with a scope and produce a live view. Any changes in the scope model are reflected in the view, and any user interactions with the view are reflected in the scope model. Making the scope model a single source of truth. Some directives such ng-repeat clone DOM elements once for each item in collection. Having a compile and link phase improves performance since the cloned template only needs to be compiled once, and then linked once for each clone instance.
- #20 http://slid.es/neenhouse/dependency-injection-in-angularjs