CodeStock: Orchestrating Apps by Composing Angular Directives

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1. Orchestrating Apps by Composing Angular Directives 9:25 AM / Ballroom C
2. Orchestrating Apps by Composing Angular Directives Jeremy Fairbank @elpapapollo
3. Hi, I’m Jeremy jfairbank @elpapapollo pushagency.io blog.jeremyfairbank.com simplybuilt.com
4. Building software is hard
5. Who is software for?
6. Who is software for? • Computers • Users • Programmers • Me • You http://www.commitstrip.com/en/2015/05/29/always-stuck-somewhere-in-my-head/
7. Competing Goals
8. Competing Goals • Performance • Maintainability • Shipping • Readability • Scalability
9. Competing Goals • Performance • Maintainability • Shipping • Readability • Scalability
10. Patterns make it “easier”
11. Why not use them with JavaScript frameworks?
12. Composition
13. What is composition?
14. What is composition?
15. What is composition?
16. – Wikipedia “The various visual elements, known as elements of design, formal elements, or elements of art, are the vocabulary with which the visual artist composes. These elements in the overall design usually relate to each other and to the whole art work.” What is composition?
17. – Wikipedia “The way in which something is put together or arranged. The combination of parts or elements that make up something.” What is composition?
18. Composition Create with small independent pieces.
19. Composition Embodiment of many design principles.
20. Design Principles
21. Design Principles • Modularity • Separation of concerns (SOC) • Loose coupling • High cohesion • Composition over inheritance • Ad nauseam…
22. Directives Review
23. Directives Review • Attach behavior to the DOM via attributes, elements, comments, or CSS classes • Componentize functionality with HTML • Create custom HTML elements
24. Directives Review • Attach behavior to the DOM via attributes, elements, comments, or CSS classes • Componentize functionality with HTML • Create custom HTML elements <my-hello-world en="es"></my-hello-world> <name-tag name="Jeremy"></name-tag>
25. Directives Review angular.module('myApp', []) .directive('nameTag', function() { return { restrict: 'E', scope: { name: '@' }, template: 'Hello, my name is {{name}}', link: function(scope) { if (!scope.name) { scope.name = 'Joe Schmoe'; } } }; });
26. Directives Review angular.module('myApp', []) .directive('nameTag', function() { return { restrict: 'E', scope: { name: '@' }, template: 'Hello, my name is {{name}}', link: function(scope) { if (!scope.name) { scope.name = 'Joe Schmoe'; } } }; });
27. Directives Review angular.module('myApp', []) .directive('nameTag', function() { return { restrict: 'E', scope: { name: '@' }, template: 'Hello, my name is {{name}}', link: function(scope) { if (!scope.name) { scope.name = 'Joe Schmoe'; } } }; });
28. Directives Review angular.module('myApp', []) .directive('nameTag', function() { return { restrict: 'E', scope: { name: '@' }, template: 'Hello, my name is {{name}}', link: function(scope) { if (!scope.name) { scope.name = 'Joe Schmoe'; } } }; });
29. Directives Review <p> <name-tag name="Jeremy Fairbank"></name-tag> <!-- Hello, my name is Jeremy Fairbank --> </p> <p> <name-tag></name-tag> <!-- Hello, my name is Joe Schmoe --> </p>
30. Directives Review <p> <name-tag name="Jeremy Fairbank"></name-tag> <!-- Hello, my name is Jeremy Fairbank --> </p> <p> <name-tag></name-tag> <!-- Hello, my name is Joe Schmoe --> </p>
31. Directives Review <p> <name-tag name="Jeremy Fairbank"></name-tag> <!-- Hello, my name is Jeremy Fairbank --> </p> <p> <name-tag></name-tag> <!-- Hello, my name is Joe Schmoe --> </p>
32. Directives Review return { restrict: 'E', scope: { name: '@' }, template: 'Hello, my name is {{name}}', link: function(scope) { if (!scope.name) { scope.name = 'Joe Schmoe'; } } };
33. Directives Review return { restrict: 'E', scope: { name: '@' }, template: 'Hello, my name is {{name}}', link: function(scope) { if (!scope.name) { scope.name = 'Joe Schmoe'; } } }; Restrict to element declaration (i.e. `<name-tag></name-tag>`) E - element A - attribute C - class name
34. Directives Review return { restrict: 'E', scope: { name: '@' }, template: 'Hello, my name is {{name}}', link: function(scope) { if (!scope.name) { scope.name = 'Joe Schmoe'; } } }; Isolate scope @ - attributes = - bindings & - behavior/callbacks
35. Directives Review return { restrict: 'E', scope: { name: '@' }, template: 'Hello, my name is {{name}}', link: function(scope) { if (!scope.name) { scope.name = 'Joe Schmoe'; } } }; Templates template - literal template templateUrl - url or script id for template
36. Directives Review return { restrict: 'E', scope: { name: '@' }, template: 'Hello, my name is {{name}}', link: function(scope) { if (!scope.name) { scope.name = 'Joe Schmoe'; } } }; link manipulate DOM or set some defaults on scope controller add to scope too, preferably for exposing an API Set up
37. Directives Review return { restrict: 'E', scope: { name: '@' }, template: 'Hello, my name is {{name}}', link: function(scope) { if (!scope.name) { scope.name = 'Joe Schmoe'; } } }; <p> <name-tag name="Jeremy Fairbank"></name-tag> <!-- Hello, my name is Jeremy Fairbank --> </p> <p> <name-tag></name-tag> <!-- Hello, my name is Joe Schmoe --> </p>
38. Directives Review return { restrict: 'E', scope: { name: '@' }, template: 'Hello, my name is {{name}}', link: function(scope) { if (!scope.name) { scope.name = 'Joe Schmoe'; } } }; <p> <name-tag name="Jeremy Fairbank"></name-tag> <!-- Hello, my name is Jeremy Fairbank --> </p> <p> <name-tag></name-tag> <!-- Hello, my name is Joe Schmoe --> </p> Supplying the attribute value
39. return { restrict: 'E', scope: { name: '@' }, template: 'Hello, my name is {{name}}', link: function(scope) { if (!scope.name) { scope.name = 'Joe Schmoe'; } } }; <p> <name-tag name="Jeremy Fairbank"></name-tag> <!-- Hello, my name is Jeremy Fairbank --> </p> <p> <name-tag></name-tag> <!-- Hello, my name is Joe Schmoe --> </p> Directives Review Using the default value
40. Composition and Angular
41. Composition and Angular • Focus on smaller problems to solve a large problem • Apply design principles to directives • Build app in terms of directives • Decompose large directives into small reusable directives • Refactoring and adding new features becomes more manageable
42. But how do we fit directives together?
43. Data Flow
44. Data Flow App Directive Directive Directive Directive Directive Directive Directive Directive Directive
45. Data Flow • Connecting directives to build an “app” through the flow of data • Handling model data among directives • Many approaches with pros and cons App Directive Directive Directive Directive Directive Directive Directive Directive Directive
46. Data Flow 1. Shared/global state with prototypal scoping 2. Exporting API’s with directive controllers 3. Isolate scope bindings and callbacks 4. Event broadcasting and emitting App Directive Directive Directive Directive Directive Directive Directive Directive Directive
47. Prototypal Scoping
48. Prototypal Scoping app.directive('imageGallery', function() { return { scope: true, templateUrl: 'image-gallery.html' }; });
49. Prototypal Scoping app.directive('imageGallery', function() { return { scope: true, templateUrl: 'image-gallery.html' }; }); Create a child scope that “inherits” from parent scope
50. Prototypal Scoping app.controller('ImageCtrl', function($scope) { function createImage(src, text) { return { src: src, text: text, favorited: false }; } $scope.mainImage = {}; $scope.imageFavorites = []; $scope.images = [ createImage('/images/cat-1.jpg', 'Cat 1'), createImage('/images/cat-2.jpg', 'Cat 2'), createImage('/images/cat-3.jpg', 'Cat 3'), createImage('/images/cat-4.jpg', 'Cat 4') ]; });
51. Prototypal Scoping app.controller('ImageCtrl', function($scope) { function createImage(src, text) { return { src: src, text: text, favorited: false }; } $scope.mainImage = {}; $scope.imageFavorites = []; $scope.images = [ createImage('/images/cat-1.jpg', 'Cat 1'), createImage('/images/cat-2.jpg', 'Cat 2'), createImage('/images/cat-3.jpg', 'Cat 3'), createImage('/images/cat-4.jpg', 'Cat 4') ]; });
52. Prototypal Scoping app.controller('ImageCtrl', function($scope) { function createImage(src, text) { return { src: src, text: text, favorited: false }; } $scope.mainImage = {}; $scope.imageFavorites = []; $scope.images = [ createImage('/images/cat-1.jpg', 'Cat 1'), createImage('/images/cat-2.jpg', 'Cat 2'), createImage('/images/cat-3.jpg', 'Cat 3'), createImage('/images/cat-4.jpg', 'Cat 4') ]; });
53. Prototypal Scoping <script id="image-gallery.html" type="text/ng-template"> <main-image></main-image> <image-list></image-list> <image-favorites></image-favorites> </script> <body ng-controller="ImageCtrl"> <image-gallery></image-gallery> </body>
54. Prototypal Scoping <script id="image-gallery.html" type="text/ng-template"> <main-image></main-image> <image-list></image-list> <image-favorites></image-favorites> </script> <body ng-controller="ImageCtrl"> <image-gallery></image-gallery> </body>
55. Prototypal Scoping <script id="image-gallery.html" type="text/ng-template"> <main-image></main-image> <image-list></image-list> <image-favorites></image-favorites> </script> <body ng-controller="ImageCtrl"> <image-gallery></image-gallery> </body>
56. Prototypal Scoping <script id="main-image.html" type="text/ng-template"> <h3>Main Image</h3> <img width="160" ng-src="{{mainImage.src}}"> </script>
57. Prototypal Scoping <script id="image-list.html" type="text/ng-template"> <h3>Images</h3> <div class="image-info" ng-repeat="image in images"> <div ng-click="favorite(image)"> <img ng-src="{{image.src}}"> </div> <p>{{image.text}}</p> <button ng-click="setMainImage(image)"> Set Main Image </button> </div> </script>
58. Prototypal Scoping <script id="image-list.html" type="text/ng-template"> <h3>Images</h3> <div class="image-info" ng-repeat="image in images"> <div ng-click="favorite(image)"> <img ng-src="{{image.src}}"> </div> <p>{{image.text}}</p> <button ng-click="setMainImage(image)"> Set Main Image </button> </div> </script>
59. Prototypal Scoping <script id="image-list.html" type="text/ng-template"> <h3>Images</h3> <div class="image-info" ng-repeat="image in images"> <div ng-click="favorite(image)"> <img ng-src="{{image.src}}"> </div> <p>{{image.text}}</p> <button ng-click="setMainImage(image)"> Set Main Image </button> </div> </script>
60. Prototypal Scoping <script id="image-list.html" type="text/ng-template"> <h3>Images</h3> <div class="image-info" ng-repeat="image in images"> <div ng-click="favorite(image)"> <img ng-src="{{image.src}}"> </div> <p>{{image.text}}</p> <button ng-click="setMainImage(image)"> Set Main Image </button> </div> </script>
61. Prototypal Scoping <script id="image-favorites.html" type="text/ng-template"> <h3>Favorites</h3> <h4>Favorited: {{imageFavorites.length}}</h4> <ul> <li ng-repeat="image in imageFavorites"> <p> <img ng-src="{{image.src}}" width="40"> {{image.text}} <button ng-click="unfavorite(image)"> Unfavorite </button> </p> </li> </ul> </script>
62. Prototypal Scoping <script id="image-favorites.html" type="text/ng-template"> <h3>Favorites</h3> <h4>Favorited: {{imageFavorites.length}}</h4> <ul> <li ng-repeat="image in imageFavorites"> <p> <img ng-src="{{image.src}}" width="40"> {{image.text}} <button ng-click="unfavorite(image)"> Unfavorite </button> </p> </li> </ul> </script>
63. Prototypal Scoping <script id="image-favorites.html" type="text/ng-template"> <h3>Favorites</h3> <h4>Favorited: {{imageFavorites.length}}</h4> <ul> <li ng-repeat="image in imageFavorites"> <p> <img ng-src="{{image.src}}" width="40"> {{image.text}} <button ng-click="unfavorite(image)"> Unfavorite </button> </p> </li> </ul> </script>
64. Prototypal Scoping app.directive('mainImage', function() { return { scope: true, templateUrl: 'image-gallery.html' }; });
65. Prototypal Scoping app.directive('imageFavorites', function() { return { scope: true, templateUrl: 'image-favorites.html', link: function(scope) { scope.unfavorite = function(image) { var i = scope.imageFavorites.indexOf(image); if (i > -1) { image.favorited = false; scope.imageFavorites.splice(i, 1); } }; } }; });
66. Prototypal Scoping app.directive('imageFavorites', function() { return { scope: true, templateUrl: 'image-favorites.html', link: function(scope) { scope.unfavorite = function(image) { var i = scope.imageFavorites.indexOf(image); if (i > -1) { image.favorited = false; scope.imageFavorites.splice(i, 1); } }; } }; });
67. Prototypal Scoping Demo
68. Prototypal Scoping What about more than one gallery? <body ng-controller="ImageCtrl"> <div ng-controller="CatImageCtrl"> <image-gallery></image-gallery> </div> <div ng-controller="NatureImageCtrl"> <image-gallery></image-gallery> </div> </body>
69. Prototypal Scoping What about more than one gallery? <body ng-controller="ImageCtrl"> <div ng-controller="CatImageCtrl"> <image-gallery></image-gallery> </div> <div ng-controller="NatureImageCtrl"> <image-gallery></image-gallery> </div> </body>
70. Prototypal Scoping app.controller('CatImageCtrl', function($scope) { $scope.images = [ createImage('/images/cat-1.jpg', 'Cat 1'), createImage('/images/cat-2.jpg', 'Cat 2'), createImage('/images/cat-3.jpg', 'Cat 3'), createImage('/images/cat-4.jpg', 'Cat 4') ]; }).controller('NatureImageCtrl', function($scope) { $scope.images = [ createImage('/images/nature-1.jpg', 'Nature 1'), createImage('/images/nature-2.jpg', 'Nature 2'), createImage('/images/nature-3.jpg', 'Nature 3'), createImage('/images/nature-4.jpg', 'Nature 4') ]; });
71. Prototypal Scoping Demo
72. Prototypal Scoping What’s the problem?
73. Prototypal Scoping Object properties on prototypes are problematic
74. app.controller('ImageCtrl', function($scope) { // ... $scope.mainImage = {}; $scope.imageFavorites = []; }); app.directive('imageList', function() { return { // ... link: function(scope) { scope.setMainImage = function(image) { scope.mainImage.src = image.src; }; scope.favorite = function(image) { if (!image.favorited) { image.favorited = true; scope.imageFavorites.push(image); } }; } }; });
75. app.controller('ImageCtrl', function($scope) { // ... $scope.mainImage = {}; $scope.imageFavorites = []; }); app.directive('imageList', function() { return { // ... link: function(scope) { scope.setMainImage = function(image) { scope.mainImage.src = image.src; }; scope.favorite = function(image) { if (!image.favorited) { image.favorited = true; scope.imageFavorites.push(image); } }; } }; });
76. app.controller('ImageCtrl', function($scope) { // ... $scope.mainImage = {}; $scope.imageFavorites = []; }); app.directive('imageList', function() { return { // ... link: function(scope) { scope.setMainImage = function(image) { scope.mainImage.src = image.src; }; scope.favorite = function(image) { if (!image.favorited) { image.favorited = true; scope.imageFavorites.push(image); } }; } }; });
77. app.controller('CatImageCtrl', function($scope) { $scope.mainImage = {}; $scope.imageFavorites = []; $scope.images = [ createImage('/images/cat-1.jpg', 'Cat 1'), createImage('/images/cat-2.jpg', 'Cat 2'), createImage('/images/cat-3.jpg', 'Cat 3'), createImage('/images/cat-4.jpg', 'Cat 4') ]; }).controller('NatureImageCtrl', function($scope) { $scope.mainImage = {}; $scope.imageFavorites = []; $scope.images = [ createImage('/images/nature-1.jpg', 'Nature 1'), createImage('/images/nature-2.jpg', 'Nature 2'), createImage('/images/nature-3.jpg', 'Nature 3'), createImage('/images/nature-4.jpg', 'Nature 4') ]; });
78. app.controller('CatImageCtrl', function($scope) { $scope.mainImage = {}; $scope.imageFavorites = []; $scope.images = [ createImage('/images/cat-1.jpg', 'Cat 1'), createImage('/images/cat-2.jpg', 'Cat 2'), createImage('/images/cat-3.jpg', 'Cat 3'), createImage('/images/cat-4.jpg', 'Cat 4') ]; }).controller('NatureImageCtrl', function($scope) { $scope.mainImage = {}; $scope.imageFavorites = []; $scope.images = [ createImage('/images/nature-1.jpg', 'Nature 1'), createImage('/images/nature-2.jpg', 'Nature 2'), createImage('/images/nature-3.jpg', 'Nature 3'), createImage('/images/nature-4.jpg', 'Nature 4') ]; });
79. Prototypal Scoping Fixed Demo
80. Prototypal Scoping • Reusable functions • Perfect when sharing data is desired • Shared data is problematic when reusing directive • Fixing shared data issues duplicates code • Assumptions about parent scopes
81. Requiring Directive Controllers
82. Requiring Directive Controllers Export an API from a parent directive
83. Requiring Directive Controllers app.directive('imageList', function() { return { require: '^imageGallery', scope: true, templateUrl: 'templates/image-list.html', link: function(scope, el, attrs, ctrl) { ctrl.setMainImage(scope.images[0]); scope.ctrl = ctrl; } }; });
84. Requiring Directive Controllers app.directive('imageList', function() { return { require: '^imageGallery', scope: true, templateUrl: 'templates/image-list.html', link: function(scope, el, attrs, ctrl) { ctrl.setMainImage(scope.images[0]); scope.ctrl = ctrl; } }; });
85. Requiring Directive Controllers app.directive('imageList', function() { return { require: '^imageGallery', scope: true, templateUrl: 'templates/image-list.html', link: function(scope, el, attrs, ctrl) { ctrl.setMainImage(scope.images[0]); scope.ctrl = ctrl; } }; }); Directive name
86. Requiring Directive Controllers app.directive('imageList', function() { return { require: '^imageGallery', scope: true, templateUrl: 'templates/image-list.html', link: function(scope, el, attrs, ctrl) { ctrl.setMainImage(scope.images[0]); scope.ctrl = ctrl; } }; }); Parent
87. Requiring Directive Controllers app.directive('imageList', function() { return { require: '^imageGallery', scope: true, templateUrl: 'templates/image-list.html', link: function(scope, el, attrs, ctrl) { ctrl.setMainImage(scope.images[0]); scope.ctrl = ctrl; } }; });
88. Requiring Directive Controllers app.directive('imageList', function() { return { require: '^imageGallery', scope: true, templateUrl: 'templates/image-list.html', link: function(scope, el, attrs, ctrl) { ctrl.setMainImage(scope.images[0]); scope.ctrl = ctrl; } }; });
89. Requiring Directive Controllers app.directive('imageGallery', function() { return { scope: true, templateUrl: 'templates/image-gallery.html', controller: function() { // ... } }; });
90. Requiring Directive Controllers app.directive('imageGallery', function() { return { scope: true, templateUrl: 'templates/image-gallery.html', controller: function() { // ... } }; });
91. controller: function() { this.mainImage = {}; this.imageFavorites = []; this.setMainImage = function(image) { this.mainImage.src = image.src; }; this.favorite = function(image) { if (!image.favorited) { image.favorited = true; this.imageFavorites.push(image); } }; this.unfavorite = function(image) { var i = this.imageFavorites.indexOf(image); if (i > -1) { image.favorited = false; this.imageFavorites.splice(i, 1); } }; }
92. controller: function() { this.mainImage = {}; this.imageFavorites = []; this.setMainImage = function(image) { this.mainImage.src = image.src; }; this.favorite = function(image) { if (!image.favorited) { image.favorited = true; this.imageFavorites.push(image); } }; this.unfavorite = function(image) { var i = this.imageFavorites.indexOf(image); if (i > -1) { image.favorited = false; this.imageFavorites.splice(i, 1); } }; }
93. controller: function() { this.mainImage = {}; this.imageFavorites = []; this.setMainImage = function(image) { this.mainImage.src = image.src; }; this.favorite = function(image) { if (!image.favorited) { image.favorited = true; this.imageFavorites.push(image); } }; this.unfavorite = function(image) { var i = this.imageFavorites.indexOf(image); if (i > -1) { image.favorited = false; this.imageFavorites.splice(i, 1); } }; }
94. Requiring Directive Controllers app.directive('mainImage', function() { return { require: '^imageGallery', // ... link: function(scope, el, attrs, ctrl) { scope.ctrl = ctrl; } } }).directive('imageFavorites', function() { return { require: '^imageGallery', // ... link: function(scope, el, attrs, ctrl) { scope.ctrl = ctrl; } }; });
95. Requiring Directive Controllers <script id="main-image.html" type="text/ng-template"> <h3>Main Image</h3> <img width="160" ng-src="{{ctrl.mainImage.src}}"> </script>
96. Requiring Directive Controllers <script id="main-image.html" type="text/ng-template"> <h3>Main Image</h3> <img width="160" ng-src="{{ctrl.mainImage.src}}"> </script>
97. Requiring Directive Controllers <script id="image-list.html" type="text/ng-template"> <h3>Images</h3> <div class="image-info" ng-repeat="image in images"> <div ng-click="ctrl.favorite(image)"> <img ng-src="{{image.src}}"> </div> <p>{{image.text}}</p> <button ng-click="ctrl.setMainImage(image)"> Set Main Image </button> </div> </script>
98. Requiring Directive Controllers <script id="image-list.html" type="text/ng-template"> <h3>Images</h3> <div class="image-info" ng-repeat="image in images"> <div ng-click="ctrl.favorite(image)"> <img ng-src="{{image.src}}"> </div> <p>{{image.text}}</p> <button ng-click="ctrl.setMainImage(image)"> Set Main Image </button> </div> </script>
99. Requiring Directive Controllers <script id="image-favorites.html" type="text/ng-template"> <h3>Favorites</h3> <h4>Favorited: {{ctrl.imageFavorites.length}}</h4> <ul> <li ng-repeat="image in ctrl.imageFavorites"> <p> <img ng-src="{{image.src}}" width="40"> {{image.text}} <button ng-click="ctrl.unfavorite(image)"> Unfavorite </button> </p> </li> </ul> </script>
100. Requiring Directive Controllers <script id="image-favorites.html" type="text/ng-template"> <h3>Favorites</h3> <h4>Favorited: {{ctrl.imageFavorites.length}}</h4> <ul> <li ng-repeat="image in ctrl.imageFavorites"> <p> <img ng-src="{{image.src}}" width="40"> {{image.text}} <button ng-click="ctrl.unfavorite(image)"> Unfavorite </button> </p> </li> </ul> </script>
101. Requiring Directive Controllers Demo
102. Requiring Directive Controllers • Consolidate behavior into a controller API • Keep own copy of data instead of sharing • Higher coupling — child directives depend upon parent directive • Still need a parent controller to scope own images (cat versus nature)
103. Isolate Scopes
104. Isolate Scopes • Directive scope is isolated from other scopes – No parent scope to inherit from – Can’t access other scopes “easily” • Use object literal for scope definition scope: { age: '@age', name: '=', selectHobby: '&onSelectHobby' }
105. Isolate Scopes <name-tag name="scopeName" age="28" on-select-hobby="printHobby(hobby)"></name-tag> scope: { name: '=', age: '@age', selectHobby: '&onSelectHobby' }
106. scope: { name: '=', age: '@age', selectHobby: '&onSelectHobby' } <name-tag name="scopeName" age="28" on-select-hobby="printHobby(hobby)"></name-tag> Isolate Scopes Explicitly specify HTML attribute
107. scope: { name: '=', age: '@age', selectHobby: '&onSelectHobby' } <name-tag name="scopeName" age="28" on-select-hobby="printHobby(hobby)"></name-tag> Isolate Scopes Implicit — use the scope key for HTML attribute
108. Isolate Scopes <name-tag name="scopeName" age="28" on-select-hobby="printHobby(hobby)"></name-tag> scope: { name: '=', age: '@age', selectHobby: '&onSelectHobby' } Bidirectional data binding Use property scopeName from current scope
109. Isolate Scopes <name-tag name="scopeName" age="28" on-select-hobby="printHobby(hobby)"></name-tag> scope: { name: '=', age: '@age', selectHobby: '&onSelectHobby' } Attribute/string binding; static. Use literal string "28"
110. Isolate Scopes <name-tag name="scopeName" age="28" on-select-hobby="printHobby(hobby)"></name-tag> scope: { name: '=', age: '@age', selectHobby: '&onSelectHobby' } Execute code in a “parent” scope (i.e. a callback) Function call with any parameter names. Uses function printHobby on parent scope (not the directive scope).
111. Isolate Scopes app.directive('nameTag', function() { return { scope: { age: '@age', name: '=', selectHobby: '&onSelectHobby' }, templateUrl: 'name-tag.html', link: function(scope, el, attrs) { scope.hobbies = ['program', 'read', 'play guitar']; scope.age = attrs.age; } }; });
112. Isolate Scopes <script id="name-tag.html" type="text/ng-template"> <p>Hi, my name is {{name}}. I am {{age}} years old.</p> <p><input type="text" ng-model="name"></p> <ul> <li ng-repeat="hobby in hobbies"> <a href="javascript:void(0)" ng-click="selectHobby({ hobby: hobby })"> {{hobby}} </a> </li> </ul> </script>
113. Isolate Scopes <script id="name-tag.html" type="text/ng-template"> <p>Hi, my name is {{name}}. I am {{age}} years old.</p> <p><input type="text" ng-model="name"></p> <ul> <li ng-repeat="hobby in hobbies"> <a href="javascript:void(0)" ng-click="selectHobby({ hobby: hobby })"> {{hobby}} </a> </li> </ul> </script>
114. Isolate Scopes <script id="name-tag.html" type="text/ng-template"> <p>Hi, my name is {{name}}. I am {{age}} years old.</p> <p><input type="text" ng-model="name"></p> <ul> <li ng-repeat="hobby in hobbies"> <a href="javascript:void(0)" ng-click="selectHobby({ hobby: hobby })"> {{hobby}} </a> </li> </ul> </script>
115. Isolate Scopes <script id="name-tag.html" type="text/ng-template"> <p>Hi, my name is {{name}}. I am {{age}} years old.</p> <p><input type="text" ng-model="name"></p> <ul> <li ng-repeat="hobby in hobbies"> <a href="javascript:void(0)" ng-click="selectHobby({ hobby: hobby })"> {{hobby}} </a> </li> </ul> </script>
116. Isolate Scopes <name-tag name="scopeName" age="28" on-select-hobby="printHobby(hobby)"></name-tag> <script id="name-tag.html" type="text/ng-template"> <p>Hi, my name is {{name}}. I am {{age}} years old.</p> <p><input type="text" ng-model="name"></p> <ul> <li ng-repeat="hobby in hobbies"> <a href="javascript:void(0)" ng-click="selectHobby({ hobby: hobby })"> {{hobby}} </a> </li> </ul> </script>
117. <script id="name-tag.html" type="text/ng-template"> <p>Hi, my name is {{name}}. I am {{age}} years old.</p> <p><input type="text" ng-model="name"></p> <ul> <li ng-repeat="hobby in hobbies"> <a href="javascript:void(0)" ng-click="selectHobby({ hobby: hobby })"> {{hobby}} </a> </li> </ul> </script> Isolate Scopes <name-tag name="scopeName" age="28" on-select-hobby="printHobby(hobby)"></name-tag> Invocations require “named arguments” via object literal.
118. Isolate Scopes Apply to the image gallery now
119. Isolate Scopes <body ng-controller="ImageCtrl"> <image-gallery images="catImages"></image-gallery> <image-gallery images="natureImages"></image-gallery> </body>
120. Isolate Scopes <body ng-controller="ImageCtrl"> <image-gallery images="catImages"></image-gallery> <image-gallery images="natureImages"></image-gallery> </body>
121. Isolate Scopes app.controller('ImageCtrl', function($scope) { $scope.catImages = [ createImage('/images/cat-1.jpg', 'Cat 1'), createImage('/images/cat-2.jpg', 'Cat 2'), createImage('/images/cat-3.jpg', 'Cat 3'), createImage('/images/cat-4.jpg', 'Cat 4') ]; $scope.natureImages = [ createImage('/images/nature-1.jpg', 'Nature 1'), createImage('/images/nature-2.jpg', 'Nature 2'), createImage('/images/nature-3.jpg', 'Nature 3'), createImage('/images/nature-4.jpg', 'Nature 4') ]; });
122. Isolate Scopes app.directive('imageGallery', function() { return { scope: { images: '=' }, templateUrl: 'templates/image-gallery.html', link: function(scope) { // ... } }; });
123. Isolate Scopes app.directive('imageGallery', function() { return { scope: { images: '=' }, templateUrl: 'templates/image-gallery.html', link: function(scope) { // ... } }; });
124. Isolate Scopes link: function(scope) { scope.mainImage = {}; scope.imageFavorites = []; scope.setMain = function(image) { scope.mainImage.src = image.src; }; scope.favorite = function(image) { scope.imageFavorites.push(image); }; scope.unfavorite = function(image) { var i = scope.imageFavorites.indexOf(image); if (i > -1) { scope.imageFavorites.splice(i, 1); } }; }
125. Isolate Scopes link: function(scope) { scope.mainImage = {}; scope.imageFavorites = []; scope.setMain = function(image) { scope.mainImage.src = image.src; }; scope.favorite = function(image) { scope.imageFavorites.push(image); }; scope.unfavorite = function(image) { var i = scope.imageFavorites.indexOf(image); if (i > -1) { scope.imageFavorites.splice(i, 1); } }; }
126. Isolate Scopes link: function(scope) { scope.mainImage = {}; scope.imageFavorites = []; scope.setMain = function(image) { scope.mainImage.src = image.src; }; scope.favorite = function(image) { scope.imageFavorites.push(image); }; scope.unfavorite = function(image) { var i = scope.imageFavorites.indexOf(image); if (i > -1) { scope.imageFavorites.splice(i, 1); } }; }
127. Isolate Scopes <script id="image-gallery.html" type="text/ng-template"> <main-image image="mainImage"></main-image> <image-list images="images" on-set-main="setMain(image)" on-favorite="favorite(image)"></image-list> <image-favorites images="imageFavorites" on-unfavorite="unfavorite(image)"></image-favorites> </script>
128. Isolate Scopes <script id="image-gallery.html" type="text/ng-template"> <main-image image="mainImage"></main-image> <image-list images="images" on-set-main="setMain(image)" on-favorite="favorite(image)"></image-list> <image-favorites images="imageFavorites" on-unfavorite="unfavorite(image)"></image-favorites> </script>
129. Isolate Scopes <script id="image-gallery.html" type="text/ng-template"> <main-image image="mainImage"></main-image> <image-list images="images" on-set-main="setMain(image)" on-favorite="favorite(image)"></image-list> <image-favorites images="imageFavorites" on-unfavorite="unfavorite(image)"></image-favorites> </script>
130. Isolate Scopes <script id="image-gallery.html" type="text/ng-template"> <main-image image="mainImage"></main-image> <image-list images="images" on-set-main="setMain(image)" on-favorite="favorite(image)"></image-list> <image-favorites images="imageFavorites" on-unfavorite="unfavorite(image)"></image-favorites> </script>
131. Isolate Scopes <script id="image-gallery.html" type="text/ng-template"> <main-image image="mainImage"></main-image> <image-list images="images" on-set-main="setMain(image)" on-favorite="favorite(image)"></image-list> <image-favorites images="imageFavorites" on-unfavorite="unfavorite(image)"></image-favorites> </script>
132. Isolate Scopes <script id="image-gallery.html" type="text/ng-template"> <main-image image="mainImage"></main-image> <image-list images="images" on-set-main="setMain(image)" on-favorite="favorite(image)"></image-list> <image-favorites images="imageFavorites" on-unfavorite="unfavorite(image)"></image-favorites> </script>
133. Isolate Scopes <script id="image-gallery.html" type="text/ng-template"> <main-image image="mainImage"></main-image> <image-list images="images" on-set-main="setMain(image)" on-favorite="favorite(image)"></image-list> <image-favorites images="imageFavorites" on-unfavorite="unfavorite(image)"></image-favorites> </script>
134. Isolate Scopes <script id="image-gallery.html" type="text/ng-template"> <main-image image="mainImage"></main-image> <image-list images="images" on-set-main="setMain(image)" on-favorite="favorite(image)"></image-list> <image-favorites images="imageFavorites" on-unfavorite="unfavorite(image)"></image-favorites> </script>
135. Isolate Scopes <script id="image-gallery.html" type="text/ng-template"> <main-image image="mainImage"></main-image> <image-list images="images" on-set-main="setMain(image)" on-favorite="favorite(image)"></image-list> <image-favorites images="imageFavorites" on-unfavorite="unfavorite(image)"></image-favorites> </script>
136. Isolate Scopes <script id="image-gallery.html" type="text/ng-template"> <main-image image="mainImage"></main-image> <image-list images="images" on-set-main="setMain(image)" on-favorite="favorite(image)"></image-list> <image-favorites images="imageFavorites" on-unfavorite="unfavorite(image)"></image-favorites> </script>
137. Isolate Scopes app.directive('mainImage', function() { return { scope: { mainImage: '=image' }, templateUrl: 'templates/main-image.html' } });
138. Isolate Scopes app.directive('mainImage', function() { return { scope: { mainImage: '=image' }, templateUrl: 'templates/main-image.html' } });
139. Isolate Scopes <script id="main-image.html" type="text/ng-template"> <h3>Main Image</h3> <img width="160" ng-src="{{mainImage.src}}"> </script>
140. Isolate Scopes <script id="main-image.html" type="text/ng-template"> <h3>Main Image</h3> <img width="160" ng-src="{{mainImage.src}}"> </script>
141. Isolate Scopes app.directive('imageFavorites', function() { return { scope: { imageFavorites: '=images', triggerUnfavorite: '&onUnfavorite' }, templateUrl: 'templates/image-favorites.html', link: function(scope) { scope.unfavorite = function(image) { image.favorited = false; scope.triggerUnfavorite({ image: image }); }; } }; });
142. Isolate Scopes app.directive('imageFavorites', function() { return { scope: { imageFavorites: '=images', triggerUnfavorite: '&onUnfavorite' }, templateUrl: 'templates/image-favorites.html', link: function(scope) { scope.unfavorite = function(image) { image.favorited = false; scope.triggerUnfavorite({ image: image }); }; } }; });
143. Isolate Scopes app.directive('imageFavorites', function() { return { scope: { imageFavorites: '=images', triggerUnfavorite: '&onUnfavorite' }, templateUrl: 'templates/image-favorites.html', link: function(scope) { scope.unfavorite = function(image) { image.favorited = false; scope.triggerUnfavorite({ image: image }); }; } }; });
144. Isolate Scopes <script id="image-favorites.html" type="text/ng-template"> <h3>Favorites</h3> <h4>Favorited: {{imageFavorites.length}}</h4> <ul> <li ng-repeat="image in imageFavorites"> <p> <img ng-src="{{image.src}}" width="40"> {{image.text}} <button ng-click="unfavorite(image)"> Unfavorite </button> </p> </li> </ul> </script>
145. Isolate Scopes <script id="image-favorites.html" type="text/ng-template"> <h3>Favorites</h3> <h4>Favorited: {{imageFavorites.length}}</h4> <ul> <li ng-repeat="image in imageFavorites"> <p> <img ng-src="{{image.src}}" width="40"> {{image.text}} <button ng-click="unfavorite(image)"> Unfavorite </button> </p> </li> </ul> </script>
146. Isolate Scopes <script id="image-favorites.html" type="text/ng-template"> <h3>Favorites</h3> <h4>Favorited: {{imageFavorites.length}}</h4> <ul> <li ng-repeat="image in imageFavorites"> <p> <img ng-src="{{image.src}}" width="40"> {{image.text}} <button ng-click="unfavorite(image)"> Unfavorite </button> </p> </li> </ul> </script>
147. app.directive('imageList', function() { return { scope: { images: '=', setMainImage: '&onSetMain', triggerFavorite: '&onFavorite' }, templateUrl: 'templates/image-list.html', link: function(scope, el, attrs, ctrl) { scope.setMainImage({ image: scope.images[0] }); scope.favorite = function(image) { if (!image.favorited) { image.favorited = true; scope.triggerFavorite({ image: image }); } }; } }; });
148. app.directive('imageList', function() { return { scope: { images: '=', setMainImage: '&onSetMain', triggerFavorite: '&onFavorite' }, templateUrl: 'templates/image-list.html', link: function(scope, el, attrs, ctrl) { scope.setMainImage({ image: scope.images[0] }); scope.favorite = function(image) { if (!image.favorited) { image.favorited = true; scope.triggerFavorite({ image: image }); } }; } }; });
149. app.directive('imageList', function() { return { scope: { images: '=', setMainImage: '&onSetMain', triggerFavorite: '&onFavorite' }, templateUrl: 'templates/image-list.html', link: function(scope, el, attrs, ctrl) { scope.setMainImage({ image: scope.images[0] }); scope.favorite = function(image) { if (!image.favorited) { image.favorited = true; scope.triggerFavorite({ image: image }); } }; } }; });
150. app.directive('imageList', function() { return { scope: { images: '=', setMainImage: '&onSetMain', triggerFavorite: '&onFavorite' }, templateUrl: 'templates/image-list.html', link: function(scope, el, attrs, ctrl) { scope.setMainImage({ image: scope.images[0] }); scope.favorite = function(image) { if (!image.favorited) { image.favorited = true; scope.triggerFavorite({ image: image }); } }; } }; });
151. Isolate Scopes <script id="image-list.html" type="text/ng-template"> <h3>Images</h3> <div class="image-info" ng-repeat="image in images"> <div ng-click="favorite(image)"> <img ng-src="{{image.src}}"> </div> <p>{{image.text}}</p> <button ng-click="setMainImage({ image: image })"> Set Main Image </button> </div> </script>
152. Isolate Scopes <script id="image-list.html" type="text/ng-template"> <h3>Images</h3> <div class="image-info" ng-repeat="image in images"> <div ng-click="favorite(image)"> <img ng-src="{{image.src}}"> </div> <p>{{image.text}}</p> <button ng-click="setMainImage({ image: image })"> Set Main Image </button> </div> </script>
153. Isolate Scopes <script id="image-list.html" type="text/ng-template"> <h3>Images</h3> <div class="image-info" ng-repeat="image in images"> <div ng-click="favorite(image)"> <img ng-src="{{image.src}}"> </div> <p>{{image.text}}</p> <button ng-click="setMainImage({ image: image })"> Set Main Image </button> </div> </script>
154. Isolate Scopes Demo
155. Isolate Scopes • Black box a directive to be self-contained and reusable • Think in terms of small pieces • Establish well-defined interface/API through HTML attributes • Juggle multiple points of state • More markup
156. Events
157. Events • Built in eventing with $emit, $broadcast, and $on methods of $scope. • Use events like a message bus to transfer data • Events travel vertically through scopes – Use parent scope event delegation for sibling directive communication
158. Events $scope.$emit('select:greeting', 'hello world'); $scope.$broadcast('add:item', 42); // In a child directive var items = []; $scope.$on('add:item', function(e, n) { items.push(n); }); // In a parent directive $scope.$on('select:greeting', function(e, greeting) { console.log(greeting.toUpperCase()); });
159. $scope.$emit('select:greeting', 'hello world'); $scope.$broadcast('add:item', 42); // In a child directive var items = []; $scope.$on('add:item', function(e, n) { items.push(n); }); // In a parent directive $scope.$on('select:greeting', function(e, greeting) { console.log(greeting.toUpperCase()); }); Events $emit sends events up to parent scopes.
160. $scope.$emit('select:greeting', 'hello world'); $scope.$broadcast('add:item', 42); // In a child directive var items = []; $scope.$on('add:item', function(e, n) { items.push(n); }); // In a parent directive $scope.$on('select:greeting', function(e, greeting) { console.log(greeting.toUpperCase()); }); Events $broadcast sends events down to child scopes.
161. $scope.$emit('select:greeting', 'hello world'); $scope.$broadcast('add:item', 42); // In a child directive var items = []; $scope.$on('add:item', function(e, n) { items.push(n); }); // In a parent directive $scope.$on('select:greeting', function(e, greeting) { console.log(greeting.toUpperCase()); }); Events $on listens for $emit and $broadcast events and triggers the provided callbacks.
162. // In a child directive var items = []; $scope.$on('add:item', function(e, n) { items.push(n); }); // In a parent directive $scope.$on('select:greeting', function(e, greeting) { console.log(greeting.toUpperCase()); }); $scope.$emit('select:greeting', 'hello world'); $scope.$broadcast('add:item', 42); Events The first parameter is an event object like DOM events.
163. // In a child directive var items = []; $scope.$on('add:item', function(e, n) { items.push(n); }); // In a parent directive $scope.$on('select:greeting', function(e, greeting) { console.log(greeting.toUpperCase()); }); $scope.$emit('select:greeting', 'hello world'); $scope.$broadcast('add:item', 42); Events Remaining parameters are the remaining arguments supplied to $emit and $broadcast.
164. $scope.$emit('select:greeting', 'hello world'); $scope.$broadcast('add:item', 42); Events // In a child directive var items = []; $scope.$on('add:item', function(e, n) { items.push(n); }); // In a parent directive $scope.$on('select:greeting', function(e, greeting) { console.log(greeting.toUpperCase()); }); Stick to a naming convention like verb:noun.
165. $scope.$emit('select:greeting', 'hello world'); $scope.$broadcast('add:item', 42); Events // In a child directive var items = []; $scope.$on('add:item', function(e, n) { items.push(n); }); // In a parent directive $scope.$on('select:greeting', function(e, greeting) { console.log(greeting.toUpperCase()); }); Verb
166. $scope.$emit('select:greeting', 'hello world'); $scope.$broadcast('add:item', 42); Events // In a child directive var items = []; $scope.$on('add:item', function(e, n) { items.push(n); }); // In a parent directive $scope.$on('select:greeting', function(e, greeting) { console.log(greeting.toUpperCase()); }); Noun
167. Events Apply to the image gallery now
168. Events <script id="image-gallery.html" type="text/ng-template"> <main-image></main-image> <image-list images="images"></image-list> <image-favorites></image-favorites> </script>
169. Events <script id="image-list.html" type="text/ng-template"> <h3>Images</h3> <div class="image-info" ng-repeat="image in images"> <div ng-click="favorite(image)"> <img ng-src="{{image.src}}"> </div> <p>{{image.text}}</p> <button ng-click="setMainImage(image)"> Set Main Image </button> </div> </script>
170. Events <script id="image-list.html" type="text/ng-template"> <h3>Images</h3> <div class="image-info" ng-repeat="image in images"> <div ng-click="favorite(image)"> <img ng-src="{{image.src}}"> </div> <p>{{image.text}}</p> <button ng-click="setMainImage(image)"> Set Main Image </button> </div> </script>
171. app.directive('imageList', function() { return { scope: { images: '=', }, templateUrl: 'templates/image-list.html', link: function(scope, el, attrs, ctrl) { scope.setMainImage = function(image) { scope.$emit('delegate:set:mainImage', image); }; scope.favorite = function(image) { if (!image.favorited) { image.favorited = true; scope.$emit('delegate:favorite:image', image); } }; scope.setMainImage(scope.images[0]); } }; });
172. app.directive('imageList', function() { return { scope: { images: '=', }, templateUrl: 'templates/image-list.html', link: function(scope, el, attrs, ctrl) { scope.setMainImage = function(image) { scope.$emit('delegate:set:mainImage', image); }; scope.favorite = function(image) { if (!image.favorited) { image.favorited = true; scope.$emit('delegate:favorite:image', image); } }; scope.setMainImage(scope.images[0]); } }; });
173. app.directive('imageList', function() { return { scope: { images: '=', }, templateUrl: 'templates/image-list.html', link: function(scope, el, attrs, ctrl) { scope.setMainImage = function(image) { scope.$emit('delegate:set:mainImage', image); }; scope.favorite = function(image) { if (!image.favorited) { image.favorited = true; scope.$emit('delegate:favorite:image', image); } }; scope.setMainImage(scope.images[0]); } }; });
174. app.directive('imageList', function() { return { scope: { images: '=', }, templateUrl: 'templates/image-list.html', link: function(scope, el, attrs, ctrl) { scope.setMainImage = function(image) { scope.$emit('delegate:set:mainImage', image); }; scope.favorite = function(image) { if (!image.favorited) { image.favorited = true; scope.$emit('delegate:favorite:image', image); } }; scope.setMainImage(scope.images[0]); } }; });
175. Events app.directive('imageGallery', function() { return { scope: { images: '=' }, templateUrl: 'templates/image-gallery.html', link: function(scope) { scope.$on('delegate:set:mainImage', function(e, image) { scope.$broadcast('set:mainImage', image); }); scope.$on('delegate:favorite:image', function(e, image) { scope.$broadcast('favorite:image', image); }); } }; });
176. Events app.directive('imageGallery', function() { return { scope: { images: '=' }, templateUrl: 'templates/image-gallery.html', link: function(scope) { scope.$on('delegate:set:mainImage', function(e, image) { scope.$broadcast('set:mainImage', image); }); scope.$on('delegate:favorite:image', function(e, image) { scope.$broadcast('favorite:image', image); }); } }; });
177. Events app.directive('mainImage', function() { return { scope: {}, templateUrl: 'templates/main-image.html', link: function(scope) { scope.mainImage = {}; scope.$on('set:mainImage', function(e, image) { scope.mainImage.src = image.src; }); } } });
178. Events app.directive('mainImage', function() { return { scope: {}, templateUrl: 'templates/main-image.html', link: function(scope) { scope.mainImage = {}; scope.$on('set:mainImage', function(e, image) { scope.mainImage.src = image.src; }); } } });
179. Events app.directive('mainImage', function() { return { scope: {}, templateUrl: 'templates/main-image.html', link: function(scope) { scope.mainImage = {}; scope.$on('set:mainImage', function(e, image) { scope.mainImage.src = image.src; }); } } });
180. Events app.directive('mainImage', function() { return { scope: {}, templateUrl: 'templates/main-image.html', link: function(scope) { scope.mainImage = {}; scope.$on('set:mainImage', function(e, image) { scope.mainImage.src = image.src; }); } } });
181. app.directive('imageFavorites', function() { return { scope: {}, templateUrl: 'templates/image-favorites.html', link: function(scope) { scope.imageFavorites = []; scope.$on('favorite:image', function(e, image) { scope.imageFavorites.push(image); }); scope.unfavorite = function(image) { var i = scope.imageFavorites.indexOf(image); if (i > -1) { image.favorited = false; scope.imageFavorites.splice(i, 1); } }; } }; });
182. app.directive('imageFavorites', function() { return { scope: {}, templateUrl: 'templates/image-favorites.html', link: function(scope) { scope.imageFavorites = []; scope.$on('favorite:image', function(e, image) { scope.imageFavorites.push(image); }); scope.unfavorite = function(image) { var i = scope.imageFavorites.indexOf(image); if (i > -1) { image.favorited = false; scope.imageFavorites.splice(i, 1); } }; } }; });
183. app.directive('imageFavorites', function() { return { scope: {}, templateUrl: 'templates/image-favorites.html', link: function(scope) { scope.imageFavorites = []; scope.$on('favorite:image', function(e, image) { scope.imageFavorites.push(image); }); scope.unfavorite = function(image) { var i = scope.imageFavorites.indexOf(image); if (i > -1) { image.favorited = false; scope.imageFavorites.splice(i, 1); } }; } }; });
184. app.directive('imageFavorites', function() { return { scope: {}, templateUrl: 'templates/image-favorites.html', link: function(scope) { scope.imageFavorites = []; scope.$on('favorite:image', function(e, image) { scope.imageFavorites.push(image); }); scope.unfavorite = function(image) { var i = scope.imageFavorites.indexOf(image); if (i > -1) { image.favorited = false; scope.imageFavorites.splice(i, 1); } }; } }; });
185. Demo Events
186. Events • Decouple directives • Isolate state more easily • Cleaner markup • Indirection of data flow (who responds to an event?) • Have to remember and duplicate event names (may hurt directive reuse)
187. Upshot
188. Upshot Refactoring
189. Refactoring • Easier to change or update app • Don’t have to touch entire app, just an individual directive – Touching multiple pieces may mean better SOC needed – SOC is evolutionary for the lifetime of the app
190. • Remove count • Remove image text • Sort images by text Alter image gallery favorites Refactoring Demo
191. Refactoring Alter image gallery favorites <script id="image-favorites.html" type="text/ng-template"> <h3>Favorites</h3> <ul> <li ng-repeat="image in imageFavorites | orderBy: 'text'"> <p> <img ng-src="{{image.src}}" width="40"> </p> <button ng-clik="unfavorite(image)"> Unfavorite </button> </li> </ul> </script>
192. <script id="image-favorites.html" type="text/ng-template"> <h3>Favorites</h3> <ul> <li ng-repeat="image in imageFavorites | orderBy: 'text'"> <p> <img ng-src="{{image.src}}" width="40"> </p> <button ng-clik="unfavorite(image)"> Unfavorite </button> </li> </ul> </script> Refactoring Alter image gallery favorites Favorites count gone
193. Refactoring Alter image gallery favorites <script id="image-favorites.html" type="text/ng-template"> <h3>Favorites</h3> <ul> <li ng-repeat="image in imageFavorites | orderBy: 'text'"> <p> <img ng-src="{{image.src}}" width="40"> </p> <button ng-clik="unfavorite(image)"> Unfavorite </button> </li> </ul> </script> Image text gone
194. Refactoring Alter image gallery favorites <script id="image-favorites.html" type="text/ng-template"> <h3>Favorites</h3> <ul> <li ng-repeat="image in imageFavorites | orderBy: 'text'"> <p> <img ng-src="{{image.src}}" width="40"> </p> <button ng-clik="unfavorite(image)"> Unfavorite </button> </li> </ul> </script>
195. Composition is a critical tool in software development.
196. Thanks! jfairbank @elpapapollo blog.jeremyfairbank.com Demo and code github.com/jfairbank/orchestrating-apps-angular