Controller in AngularJS

Nov 8, 2014Download as docx, pdf

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The document outlines the role of controllers in AngularJS, describing how they define application behavior by managing the scope while avoiding DOM manipulation and input/output formatting. It also illustrates the controller hierarchy for property access across parent and child controllers, as well as methods for sharing data through services. Best practices for naming controllers and examples of AngularJS applications are provided.

Controllers
Controller is a JavaScript constructor function that is used to augment the Angular Scope. Controllers are the place
where we define our application behaviors by defining properties and functions.
$controller service is responsible for instantiating controllers.
Use controllers to:
 Set up the initial state of the $scope object.
 Add behavior to the $scope object.
Do not use controllers to:
 Manipulate DOM — Controllers should contain only Application logic. Angular has databinding for most
cases and directives to encapsulate manual DOM manipulation.
 Format input — Use angular form controls instead.
 Filter output — Use angular filters instead.
 Share code or state across controllers — Use angular services instead.
 Manage the life-cycle of other components (for example, to create service instances).
Property Initialization in Controller
Action declaration in Controller

NOTE: It is considered a best-practice to name our controllers as [Name]Controller, rather than [Name]Ctrl.
Example
external.js
//defining module
var app = angular.module('IG', []);
//Action Method: increase
//Action Method: decrease
app.controller('FirstController', function ($scope) {
$scope.counter = 0;
$scope.add = function (amount) { $scope.counter += amount; };
$scope.subtract = function (amount) { $scope.counter -= amount; };
});
index.html
<!DOCTYPE html>
<html ng-app="IG">
<head>
<title>AngularJS rootScope and scope :: InterviewGully.com</title>
<script
src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.6/angular.js"></script>
<script src="Scripts/external.js"></script>
</head>
<body>
<div ng-controller="FirstController">
<h4>The simplest adding machine ever</h4>
<button ng-click="add(1)" class="button">Increase</button>
<button ng-click="subtract(1)" class="button alert">Decrease</button>
<h4>Current count: {{ counter }}</h4>
</div>
</body>
</html>
Controller Hierarchy (Scopes within Scopes)
By default, for any property that AngularJS cannot find on a local scope, AngularJS will crawl up to the containing
(parent) scope and look for the property or method there. If AngularJS can’t find the property there, it will walk to that
scope’s parent and so on and so forth until it reaches the Controllers $rootScope.
If it doesn’t find it on the $rootScope, then it moves on and is unable to update the view.
//defining module
var app = angular.module('IG', []);
//Property: person
app.controller('ParentController', function ($scope) {
$scope.person = { greeted: false };
});
//Action: sayHello

app.controller('ChildController', function ($scope) {
$scope.sayHello = function () {
$scope.person.name = "Ari Lerner";
$scope.person.greeted = true;
}
});
To see this behavior in action, let’s create a ParentController that contains the user object and a
ChildController that wants to reference that object.
If we bind the ChildController under the ParentController in our view, then the parent of the ChildController’s $scope
object will be the ParentController’s $scope object. Due to the prototypal behavior, we can then reference data on the
ParentController’s containing $scope on the child scope.
<!DOCTYPE html>
<html ng-app="IG">
<head>
<title>AngularJS rootScope and scope :: InterviewGully.com</title>
<script
src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.6/angular.js"></script>
<script src="Scripts/external.js"></script>
</head>
<body>
<div ng-controller="ParentController">
<div ng-controller="ChildController">
<button ng-click="sayHello()">Say hello</button>
</div>
{{ person }}
</div>
</body>
</html>
Sharing Data between Controller
//defining module
var app = angular.module('IG', []);
//Property: person
app.controller('FirstController', function ($scope,data) {
$scope.person.name = data;
});
//Property: person
app.controller('SecondController', function ($scope,data) {
$scope.person.name = data;
});

//factory services
app.factory('data', function () {
return {
Message: 'hey I am ur service'
};
});
<!DOCTYPE html>
<html ng-app="IG">
<head>
<title>AngularJS rootScope and scope :: InterviewGully.com</title>
<script
src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.6/angular.js"></script>
<script src="Scripts/external.js"></script>
</head>
<body>
<div ng-controller="FirstController">
{{ person }}
</div>
<div ng-controller="SecondController">
{{ person }}
</div>
</body>
</html>

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Completed Sunday 6/8. For Weekend 6/14 & 15th. (Fathers Day Weekend US.) These workshops are also timeless for future students TY. No admissions needed. A 9th FREE WORKSHOP Reiki - Yoga “Intuition-II, The Chakras” Your Attendance is valued. We hit over 5k views for Spring Workshops and Updates-TY. Thank you for attending our workshops. If you are new, do welcome. Grad Students: I am planning a Reiki-Yoga Master Course (As a package). I’m Fusing both together. This will include the foundation of each practice. Our Free Workshops can be used with any Reiki Yoga training package. Traditional Reiki does host rules and ethics. Its silent and within the JP Culture/Area/Training/Word of Mouth. It allows remote healing but there’s limits As practitioners and masters, we are not allowed to share certain secrets/tools. Some content is designed only for “Masters”. Some yoga are similar like the Kriya Yoga-Church (Vowed Lessons). We will review both Reiki and Yoga (Master tools) in the Course upcoming. S9/This Week’s Focus: * A continuation of Intuition-2 Development. We will review the Chakra System - Our temple. A misguided, misused situation lol. This will also serve Attunement later. Thx for tuning in. Your time investment is valued. I do select topics related to our timeline and community. For those seeking upgrades or Reiki Levels. Stay tuned for our June packages. It’s for self employed/Practitioners/Coaches… Review & Topics: * Reiki Is Japanese Energy Healing used Globally. * Yoga is over 5k years old from India. It hosts many styles, teacher versions, and it’s Mainstream now vs decades ago. * Anything of the Holistic, Wellness Department can be fused together. My origins are Alternative, Complementary Medicine. In short, I call this ND. I am also a metaphysician. I learnt during the 90s New Age Era. I forget we just hit another wavy. It’s GenZ word of Mouth, their New Age Era. WHOA, History Repeats lol. We are fusing together. * So, most of you have experienced your Spiritual Awakening. However; The journey wont be perfect. There will be some roller coaster events. The perks are: We are in a faster Spiritual Zone than the 90s. There’s more support and information available. (See Presentation for all sections, THX AGAIN.)

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Controller in AngularJS

1. Controllers Controller is a JavaScript constructor function that is used to augment the Angular Scope. Controllers are the place where we define our application behaviors by defining properties and functions. $controller service is responsible for instantiating controllers. Use controllers to:  Set up the initial state of the $scope object.  Add behavior to the $scope object. Do not use controllers to:  Manipulate DOM — Controllers should contain only Application logic. Angular has databinding for most cases and directives to encapsulate manual DOM manipulation.  Format input — Use angular form controls instead.  Filter output — Use angular filters instead.  Share code or state across controllers — Use angular services instead.  Manage the life-cycle of other components (for example, to create service instances). Property Initialization in Controller Action declaration in Controller

2. NOTE: It is considered a best-practice to name our controllers as [Name]Controller, rather than [Name]Ctrl. Example external.js //defining module var app = angular.module('IG', []); //Action Method: increase //Action Method: decrease app.controller('FirstController', function ($scope) { $scope.counter = 0; $scope.add = function (amount) { $scope.counter += amount; }; $scope.subtract = function (amount) { $scope.counter -= amount; }; }); index.html <!DOCTYPE html> <html ng-app="IG"> <head> <title>AngularJS rootScope and scope :: InterviewGully.com</title> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.6/angular.js"></script> <script src="Scripts/external.js"></script> </head> <body> <div ng-controller="FirstController"> <h4>The simplest adding machine ever</h4> <button ng-click="add(1)" class="button">Increase</button> <button ng-click="subtract(1)" class="button alert">Decrease</button> <h4>Current count: {{ counter }}</h4> </div> </body> </html> Controller Hierarchy (Scopes within Scopes) By default, for any property that AngularJS cannot find on a local scope, AngularJS will crawl up to the containing (parent) scope and look for the property or method there. If AngularJS can’t find the property there, it will walk to that scope’s parent and so on and so forth until it reaches the Controllers $rootScope. If it doesn’t find it on the $rootScope, then it moves on and is unable to update the view. //defining module var app = angular.module('IG', []); //Property: person app.controller('ParentController', function ($scope) { $scope.person = { greeted: false }; }); //Action: sayHello

3. app.controller('ChildController', function ($scope) { $scope.sayHello = function () { $scope.person.name = "Ari Lerner"; $scope.person.greeted = true; } }); To see this behavior in action, let’s create a ParentController that contains the user object and a ChildController that wants to reference that object. If we bind the ChildController under the ParentController in our view, then the parent of the ChildController’s $scope object will be the ParentController’s $scope object. Due to the prototypal behavior, we can then reference data on the ParentController’s containing $scope on the child scope. <!DOCTYPE html> <html ng-app="IG"> <head> <title>AngularJS rootScope and scope :: InterviewGully.com</title> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.6/angular.js"></script> <script src="Scripts/external.js"></script> </head> <body> <div ng-controller="ParentController"> <div ng-controller="ChildController"> <button ng-click="sayHello()">Say hello</button> </div> {{ person }} </div> </body> </html> Sharing Data between Controller //defining module var app = angular.module('IG', []); //Property: person app.controller('FirstController', function ($scope,data) { $scope.person.name = data; }); //Property: person app.controller('SecondController', function ($scope,data) { $scope.person.name = data; });

4. //factory services app.factory('data', function () { return { Message: 'hey I am ur service' }; }); <!DOCTYPE html> <html ng-app="IG"> <head> <title>AngularJS rootScope and scope :: InterviewGully.com</title> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.6/angular.js"></script> <script src="Scripts/external.js"></script> </head> <body> <div ng-controller="FirstController"> {{ person }} </div> <div ng-controller="SecondController"> {{ person }} </div> </body> </html>

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