AngularJS snippets

New feature in AngularJS 1.3.0

• Strict DI – an option for finding places in your application that will not minify due to use of short-hand DI syntax

ng-app ng-strict-di

Angular code convention example

angular.module('todoApp', [])
 //dependencies in array .controller('TodoController', ['$scope', function($scope) { }]);
  .controller('TodoController', ['$scope', function($scope) { 
 
    $scope.todos = [
      {text:'Todo Item 1', done:true},
      {text:'Todo Item 2', done:false}];
 
    $scope.addTodo = function() {
      $scope.todos.push({text:$scope.todoText, done:false});
      $scope.todoText = '';
    };
    
    $scope.remaining = function() {
      var count = 0;
      angular.forEach($scope.todos, function(todo) {
        count += todo.done ? 0 : 1;
      });
      return count;
    };
 
    $scope.archive = function() {
      var oldTodos = $scope.todos;
      $scope.todos = [];
      angular.forEach(oldTodos, function(todo) {
        if (!todo.done) $scope.todos.push(todo);
      });
    };
}]);

Function to check number of watchers on page

(function () { 
    var root = $(document.getElementsByTagName('body'));
    var watchers = [];

    var f = function (element) {
        if (element.data().hasOwnProperty('$scope')) {
            angular.forEach(element.data().$scope.$$watchers, function (watcher) {
                watchers.push(watcher);
            });
        }

        angular.forEach(element.children(), function (childElement) {
            f($(childElement));
        });
    };

    f(root);

    console.log(watchers.length);
})();

or via bookmarklet version and searching for ng-app on page

<a href="javascript:(function(){try{var a=$(document.querySelector('[ng-app], [data-ng-app]')),n=[],t=0,r=function(a){a.data().hasOwnProperty('$scope')&&angular.forEach(a.data().$scope.$$watchers,function(a){n.push(a)}),angular.forEach(a.children(),function(a){r($(a))})};r(a),t=n.length,alert(t+' watcher'+(t===1?'':'s')+'.')}catch(c){alert('This is not an Angular app.')}})();">WatchCount</a>

Using Angular $http service example

$http({method: 'GET', url: '/someUrl'})
   .success(function(data, status, headers, config) {
      // this callback will be called asynchronously
      // when the response is available
   })
   .error(function(data, status, headers, config) {
      // called asynchronously if an error occurs
      // or server returns response with an error status.
   });

Checking values for changes explicitly using $apply

first way is prefered because it allows angular to capture, and handle exceptions and errors inside of its framework, second does not

//when we're inside callbacks that are outside of the Angular world, 
//we need to explicitly tell angular to check the values 
//for changes using $apply like this:

scope.$apply(function() {
   ..... // the code 
});

//or you can do this:

... some code that changes the scope
scope.$apply();