Angularjs - lazy loading techniques

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A presentation made for the AngularJS-IL meetup group that took place in jan 2014 at Google TLV Campus.
its a demonstration of how to integrate requireJS with AngularJS to achieve lazy loading and registration of angular components after bootstrap.
this slideshow contain a link for a working demo

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Angularjs - lazy loading techniques

  1. 1. Lazy Loading Techniques
  2. 2. Introduction Nir Kaufman nirkaufman@gmail.com AngularJS infrastructures - lazy loading techniques: 1. Introducing the lazy loading challenges with AngularJS 2. Review a working demo project nirkaufman@gmail.com
  3. 3. overview AngularJS encourage us to break our code into smaller pieces. Modules services directives controllers filters constants nirkaufman@gmail.com
  4. 4. overview Separating your code into multiple files considered a best practice when building large apps with angular. Angular seed project: ❖ js/ angular.module('myApp.controllers', []). ■ ■ ■ ■ ❖ controllers.js services.js directives.js filters.js partials/ ■ partial1.html ■ partial2.html controller('MyCtrl1', function() { }) .controller('MyCtrl2', function() { }); nirkaufman@gmail.com
  5. 5. overview We can define our modules as dependencies: angular.module('myApp',['ngRoute', 'myApp.filters', 'myApp.services', 'myApp.directives', 'myApp.controllers', ’ngRoute’, ’ngResource’, ’ui.bootstrap’, ]). nirkaufman@gmail.com
  6. 6. overview but we must load all of our resources ahead: <script src="lib/angular.js"></script> <script src="lib/angular-route.js"></script> <script src="js/app.js"></script> <script src="js/services.js"></script> <script src="js/controllers.js"></script> <script src="js/filters.js"></script> <script src="js/directives.js"></script> ……………….. <script src="lib/angular-resource.js"></script> <script src="lib/angular-bootstrap.js"></script> <script src="lib/underscore.js"></script> nirkaufman@gmail.com
  7. 7. overview All components must register against our module on bootstrap. otherwise we can't use them. Error: Argument ‘myController’ is not a function, got undefined register Lazy Loading Angular components nirkaufman@gmail.com
  8. 8. solution We need to answer those 3 questions in order to solve this challenge: ● How to lazy load scripts async ? ● How to register our components against our module after bootstrap? ● When & where the actual loading occurs? nirkaufman@gmail.com
  9. 9. loading RequireJS provides a clean way to load and manage dependencies for our applications. <script data-main="main" src="require.js"></script> define(function () { // module code }) require([‘module’], function (module) { // use this module }) http://requirejs.org/ nirkaufman@gmail.com
  10. 10. register Components register against the module in the config phase using providers. For instance, we can register our controller manually using the ‘$controllerProvider’: angular.module('moduleName', []) .config(function($controllerProvider) { $controllerProvider.register('Ctrl', function () { // controller code }) }); nirkaufman@gmail.com
  11. 11. register All components can be registered with their matching provider methods: // services can register with $provide $provide.service() $provide.factory(), $provide.value(), $provide.constant(), // other components use specific providers $controllerProvider.resgister() $animateProvider.resgister() $filterProvider.resgister() $compileProvider.directive() nirkaufman@gmail.com
  12. 12. register we need to hold a reference to this provider in order to use it later in our code: var app = angular.module('moduleName', []) .config(function($controllerProvider) { app.loadController = $controllerProvider.register; }) }); app.loadController(‘someCtrl’, function ($scope) {}) nirkaufman@gmail.com
  13. 13. when to load Where in the application should the actual loading take place? ● when routing to a view - $routeProvider ● when loading content - <ng-include> ● in response to event - like click or hover nirkaufman@gmail.com
  14. 14. routing The route object contain a ‘resolve’ property that can accept a map of promises and wait for them to resolve before performing the route angular.module('moduleName', []) .config(function($routeProvider) { $routeProvider.when('/', { templateUrl: 'view.html', controller : 'controller.js', resolve : // promise }) }) }); nirkaufman@gmail.com
  15. 15. routing If every view managed by a controller we can reflect that in our project structure by packing them together & come up with naming conventions: ❖ views ➢ view-name ■ view-name.html ■ view-name.js .controller(‘viewNameCtrl’, …. ➢ another-view ■ another-view-name.html ■ another-view-name.js nirkaufman@gmail.com
  16. 16. events We can load our dependencies as a reaction to an event. we can be creative and load our resources depending on the user behaviour: ● load only when a user start to fill a form ● load by mouse position ● load when a response comming back from the server nirkaufman@gmail.com
  17. 17. modules What about module loading? ocLazyLoad is probably the best solution for lazy loading angular modules (for now): ● Dependencies are automatically loaded ● Debugger like (no eval code) ● The ability to mix normal boot and load on demand ● Load via the service or the directive ● Use your own async loader (requireJS, script.js ...) https://github.com/ocombe/ocLazyLoad nirkaufman@gmail.com
  18. 18. summary Lazy loading in Angular can be achived today with minimum effort. to keep our loading infrastructure flexible: 1. keep the loading logic in separated services this will make our life easier when this feature will be officially supported 2. use naming conventions this way developers can integrate more easily when moving between projects nirkaufman@gmail.com
  19. 19. summary Thank You! Demo project source code: https://github.com/nirkaufman/lazyLoadingDemo nirkaufman@gmail.com

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