angular.js/src/ng/directive/ngController.js

'use strict';

/**
 * @ngdoc directive
 * @name ng.directive:ngController
 *
 * @description
 * The `ngController` directive assigns behavior to a scope. This is a key aspect of how angular
 * supports the principles behind the Model-View-Controller design pattern.
 *
 * MVC components in angular:
 *
 * * Model — The Model is data in scope properties; scopes are attached to the DOM.
 * * View — The template (HTML with data bindings) is rendered into the View.
 * * Controller — The `ngController` directive specifies a Controller class; the class has
 *   methods that typically express the business logic behind the application.
 *
 * Note that an alternative way to define controllers is via the {@link ng.$route $route} service.
 *
 * @element ANY
 * @scope
 * @param {expression} ngController Name of a globally accessible constructor function or an
 *     {@link guide/expression expression} that on the current scope evaluates to a
 *     constructor function.
 *
 * @example
 * Here is a simple form for editing user contact information. Adding, removing, clearing, and
 * greeting are methods declared on the $scope by the controller (see source tab). These methods can
 * easily be called from the angular markup. Notice that any changes to the data are automatically
 * reflected in the View without the need for a manual update.
   <doc:example>
     <doc:source>
      <script>
        function SettingsController($scope) {
          $scope.name = "John Smith";
          $scope.contacts = [
            {type:'phone', value:'408 555 1212'},
            {type:'email', value:'john.smith@example.org'} ];

          $scope.greet = function() {
           alert(this.name);
          };

          $scope.addContact = function() {
           this.contacts.push({type:'email', value:'yourname@example.org'});
          };

          $scope.removeContact = function(contactToRemove) {
           var index = this.contacts.indexOf(contactToRemove);
           this.contacts.splice(index, 1);
          };

          $scope.clearContact = function(contact) {
           contact.type = 'phone';
           contact.value = '';
          };
        }
      </script>
      <div ng-controller="SettingsController">
        Name: <input type="text" ng-model="name"/>
        [ <a href="" ng-click="greet()">greet</a> ]<br/>
        Contact:
        <ul>
          <li ng-repeat="contact in contacts">
            <select ng-model="contact.type">
               <option>phone</option>
               <option>email</option>
            </select>
            <input type="text" ng-model="contact.value"/>
            [ <a href="" ng-click="clearContact(contact)">clear</a>
            | <a href="" ng-click="removeContact(contact)">X</a> ]
          </li>
          <li>[ <a href="" ng-click="addContact()">add</a> ]</li>
       </ul>
      </div>
     </doc:source>
     <doc:scenario>
       it('should check controller', function() {
         expect(element('.doc-example-live div>:input').val()).toBe('John Smith');
         expect(element('.doc-example-live li:nth-child(1) input').val())
           .toBe('408 555 1212');
         expect(element('.doc-example-live li:nth-child(2) input').val())
           .toBe('john.smith@example.org');

         element('.doc-example-live li:first a:contains("clear")').click();
         expect(element('.doc-example-live li:first input').val()).toBe('');

         element('.doc-example-live li:last a:contains("add")').click();
         expect(element('.doc-example-live li:nth-child(3) input').val())
           .toBe('yourname@example.org');
       });
     </doc:scenario>
   </doc:example>
 */
var ngControllerDirective = [function() {
  return {
    scope: true,
    controller: '@'
  };
}];