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| 1 <h1 id="lab_3_model_view_controller">Lab 3 - Model-View-Controller</h1> |
| 2 |
| 3 <p>Whenever your application grows beyond a single script with a few dozen lines
, it gets |
| 4 harder and harder to manage without a good separation of roles among app compone
nts. One of the most common |
| 5 models for structuring a complex application, no matter what language, is the Mo
del-View-Controller (MVC) and |
| 6 its variants, like Model-View-Presentation (MVP).</p> |
| 7 |
| 8 <p>There are several frameworks to help apply <a href="http://developer.chrome.c
om/trunk/apps/app_frameworks.html">MVC concepts</a> to a Javascript application,
and most of them, |
| 9 as long as they are CSP compliant, can be used in a Chrome App. We will use the
<a href="http://angularjs.org/">AngularJS</a> framework in parts of this tutoria
l, with a special focus on the framework in this section.</p> |
| 10 |
| 11 <h2 id="you_should_also_read">You should also read</h2> |
| 12 |
| 13 <ul> |
| 14 <li><p><a href="http://developer.chrome.com/trunk/apps/angular_framework.html">B
uild Apps with AngularJS</a> tutorial</p></li> |
| 15 <li><p><a href="http://angularjs.org/">AngularJS Todo</a> tutorial</p></li> |
| 16 </ul> |
| 17 |
| 18 <p class="note"><b>Note:</b> Chrome apps don't enforce any specific framewo
rk or programming style. This section and additional parts of this tutorial use
the AngularJS framework. Most of the code from this section was copied, with sma
ll changes, from the AngularJS Todo tutorial. </p> |
| 19 |
| 20 <h2 id="create_a_simple_view_using_angularjs">Create a simple view using Angular
JS</h2> |
| 21 |
| 22 <ol> |
| 23 <li><p>Download the <a href="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.
2/angular.min.js">Angular script</a> and save it as <a href="https://github.com/
GoogleChrome/chrome-app-codelab/blob/master/lab3_mvc/angularjs/simpleview/angula
r.min.js">angular.min.js</a>.</p></li> |
| 24 <li><p>Change your <a href="https://github.com/GoogleChrome/chrome-app-codelab/b
lob/master/lab3_mvc/angularjs/simpleview/index.html">index.html</a> to use a sim
ple Angular sample: |
| 25 <pre> |
| 26 <html ng-app ng-csp> |
| 27 <head> |
| 28 <script src="angular.min.js"></script> |
| 29 <link rel="stylesheet" href="todo.css"> |
| 30 </head> |
| 31 <body> |
| 32 <h2>Todo</h2> |
| 33 <div> |
| 34 <ul> |
| 35 <li> |
| 36 {{todoText}} |
| 37 </li> |
| 38 </ul> |
| 39 <input type="text" ng-model="todoText" size="
30" |
| 40 placeholder="type your todo here"> |
| 41 </div> |
| 42 </body> |
| 43 </html> |
| 44 </pre></p></li> |
| 45 <li><p>Add a simple stylesheet: <a href="https://github.com/GoogleChrome/chrome-
app-codelab/blob/master/lab3_mvc/angularjs/simpleview/todo.css">todo.css</a> |
| 46 <pre> |
| 47 body { |
| 48 font-family: "Helvetica Neue",Helvetica,Arial,sans-serif; |
| 49 } |
| 50 |
| 51 ul { |
| 52 list-style: none; |
| 53 } |
| 54 |
| 55 button, input[type=submit] { |
| 56 background-color: #0074CC; |
| 57 background-image: linear-gradient(top, #08C, #05C); |
| 58 border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.25); |
| 59 text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.25); |
| 60 color: white; |
| 61 } |
| 62 |
| 63 .done-true { |
| 64 text-decoration: line-through; |
| 65 color: grey; |
| 66 } |
| 67 </pre></li><li>Check the results by reloading the app: open the app, right-click
and select Reload App.</li> |
| 68 </ol> |
| 69 |
| 70 <p class="note"><b>Note:</b> The ng-csp directive tells Angular to run in a &qu
ot;content security mode". You don't need this directive when using Ang
ular v1.1.0+. We've included it here so that the sample works regardless of
the Angular version in use.</p> |
| 71 |
| 72 <h2 id="add_a_controller">Add a Controller</h2> |
| 73 |
| 74 The previous sample, although interesting, is not exactly useful. Let's tran
sform it into a real Todo list, instead of a simple Todo item. We will create a
controller (controller.js) and make some small changes in the index.html: |
| 75 |
| 76 <ol> |
| 77 <li>Add the <a href="https://github.com/GoogleChrome/chrome-app-codelab/blob/mas
ter/lab3_mvc/angularjs/withcontroller/controller.js">controller.js</a> file: |
| 78 <pre> |
| 79 function TodoCtrl($scope) { |
| 80 $scope.todos = [ |
| 81 {text:'learn angular', done:true}, |
| 82 {text:'build an angular Chrome packaged app', done:false}]; |
| 83 |
| 84 $scope.addTodo = function() { |
| 85 $scope.todos.push({text:$scope.todoText, done:false}); |
| 86 $scope.todoText = ''; |
| 87 }; |
| 88 |
| 89 $scope.remaining = function() { |
| 90 var count = 0; |
| 91 angular.forEach($scope.todos, function(todo) { |
| 92 count += todo.done ? 0 : 1; |
| 93 }); |
| 94 return count; |
| 95 }; |
| 96 |
| 97 $scope.archive = function() { |
| 98 var oldTodos = $scope.todos; |
| 99 $scope.todos = []; |
| 100 angular.forEach(oldTodos, function(todo) { |
| 101 if (!todo.done) $scope.todos.push(todo); |
| 102 }); |
| 103 }; |
| 104 } |
| 105 </pre></p></li><li><p>Change <a href="https://github.com/GoogleChrome/chrome-app
-codelab/blob/master/lab3_mvc/angularjs/withcontroller/index.html">index.html</a
> file: |
| 106 <pre> |
| 107 <html ng-app ng-csp> |
| 108 <head> |
| 109 <script src="angular.min.js"></script> |
| 110 <script src="controller.js"></script> |
| 111 <link rel="stylesheet" href="todo.css"> |
| 112 </head> |
| 113 <body> |
| 114 <h2>Todo</h2> |
| 115 <div ng-controller="TodoCtrl"> |
| 116 <span>{{remaining()}} of {{todos.lengt
h}} remaining</span> |
| 117 [ <a href="" ng-click="archive()">archive</a&
gt; ] |
| 118 <ul> |
| 119 <li ng-repeat="todo in todos"> |
| 120 <input type="checkbox" ng-model="todo.done"> |
| 121 <span class="done-{{todo.done}}">&
#123;{todo.text}}</span> |
| 122 </li> |
| 123 </ul> |
| 124 <form ng-submit="addTodo()"> |
| 125 <input type="text" ng-model="todoText" size="
;30" |
| 126 placeholder="add new todo here"> |
| 127 <input class="btn-primary" type="submit" value=&q
uot;add"> |
| 128 </form> |
| 129 </div> |
| 130 </body> |
| 131 </html> |
| 132 </pre></p></li> |
| 133 <li><p>Check the results by reloading the app: open the app, right-click and sel
ect Reload App.</p></li> |
| 134 </ol> |
| 135 |
| 136 <p>Note how the data, stored in an array inside the controller, binds to the vie
w and is automatically updated when it is changed by the controller.</p> |
| 137 |
| 138 <h1 id="takeaways_">Takeaways:</h1> |
| 139 |
| 140 <ul> |
| 141 <li><p>Chrome apps are <a href="http://developer.chrome.com/apps/offline_apps.ht
ml">offline first</a>, so the recommended way to include third-party scripts is
to download and package them inside your app.</p></li> |
| 142 <li><p>You can use any framework you want, as long as it complies with Content S
ecurity Policies and other restrictions that Chrome apps are enforced to follow.
</p></li> |
| 143 <li><p>MVC frameworks make your life easier. Use them, specially if you want to
build a non-trivial application.</p></li> |
| 144 </ul> |
| 145 |
| 146 <h1 id="what_39_s_next_">What's next?</h1> |
| 147 |
| 148 <p>Eventually in <a href="app_codelab4_testing.html">lab4_testing</a>, you will
test your app. |
| 149 Right now this lab is a work-in-progress. You can skip ahead to <a href="app_cod
elab5_data.html">lab5_data</a>.</p> |
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Chromium Code Reviews
Issue 12221067:
Move Chrome Apps Codelab docs to developer.chrome.com (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src