Showing posts with label ng-controller. Show all posts
Showing posts with label ng-controller. Show all posts

Sunday, August 9, 2015

AngularJS Basics

AngularJS is a Javascript framework which makes it incredibly easy to build web applications

Features of AngularJS: There are many features in AngularJS, primarily 2-way data binding, OO way of JS development, easy mapping between dom and JS model, Create custom tags, Dirty check on objects, implementing Routers.

Components:
  • RouteProvider
  • AngularJS templates (or) partials. 
  • Module
  • Controller

MVC: 
  • View holds the html fragments
  • Controller - holds the action to be performed
  • Model: holds data by getting from the REST services. 

Some attributes: 
  • ng-app: tell that this html page contains angularJS app
  • ng-model: bind the model to the div
  • ng-bind: used to bind the input tag to the model
  • ng-repeat: used to iterate through a list of model and display content. 
  • ng-controller: defines the controller that will be used for this div or section. 
  • ng-show | ng-hide: hide or show a div or section
  • ng-include: include another file in the html


AngularJS Directives: 
You can use directives in different ways:
  • As an attribute to a tag. 
  • As an element
  • As a class
  • As a comment
ng-init: used to initialise angularJS variables

You can also create custom directives: 

You have to use .directive method in the module to define a directive
myAppModule.directive('colorList', function () {
    return {
        restrict: 'AE',
        template:
              "<button ng-click='showHideColors()' type='button'>"
            + "{{isHidden ? 'Show Available Colors' : 'Hide Available Colors'}}"
            + "</button><div ng-hide='isHidden' id='colorContainer'>"
            + "</div>"

        }
});

AngularJS validation: 
  • $dirty
  • $valid
  • $invalid
  • $pristine

AngularJS Expressions: 
<p>My first expression: {{ 5 + 5 }}</p>
(or) 
<p>My first expression: {{ emp.getValue }}</p>
where emp is a angularJS model. 

AngularJS Filters: used to filter a list of values and display 
<div ng-app="myApp" ng-controller="personCtrl">
<p>The name is {{ lastName | uppercase }}</p>
</div>

You can also create custom filters in AngularJS:


Events:
  • ng-click
  • ng-double-click

Angular Services:
$http: 
app.controller('customersCtrl', function($scope, $http) {
    $http.get("http://www.w3schools.com/angular/customers.php")
    .success(function(response) {$scope.names = response.records;});
});

var promise = $http({method: 'POST', url: 'memberservices/register', data: theData});

$window: represents browser window object. 
$location: gets information about the url and gives it to your application
$document: jqlite reference

You can also create custom services: 



—————————— Code Snippets ————————
Simplest AngularJS program
Enter your name : <input type="text" ng-model="ename">
Hello {{ ename }}
<script type="text/javascript" src="../js/lib/angular.min.js"></script>

Sample app code: 
<div ng-app="myApp" ng-controller="myCtrl">

First Name: <input type="text" ng-model="firstName"><br>
Last Name: <input type="text" ng-model="lastName"><br>
<br>
Full Name: {{firstName + " " + lastName}}

</div>

<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
    $scope.firstName= "John";
    $scope.lastName= "Doe";
});
</script>

RouteProvider: used to define which AngularJS controller to call when you hit a URL
helloWorldApp.config(['$routeProvider', '$locationProvider', 
function($routeProvider, $locationProvider){ 
 $routeProvider
   when('/', { 
     templateUrl: 'partials/main.html', 
     controller: 'MainCtrl' }).
   when('/show', { 
     templateUrl: 'partials/show.html', 
     controller: 'ShowCtrl' 
}); 

AngularJS Templates: 
  • ng-view

AngularJS Controllers: 
  • Define methods which would inturn get the data from the server
      • use $http
var addonsControllers = 
  angular.module('addonsControllers', []);

addonsControllers.controller('AddonsCtrl', 
  ['$scope', 'checkCreds', '$location', 'AddonsList', '$http', 'getToken',
    function AddonsCtrl($scope, checkCreds, $location, AddonsList, 
      $http, getToken) {
        if (checkCreds() !== true) {
            $location.path('/loginForm');
        }

        $http.defaults.headers.common['Authorization'] = 
          'Basic ' + getToken();
        AddonsList.getList({},
           function success(response) { 
              console.log("Success:" + 
                     JSON.stringify(response));
                    $scope.addonsList = response;
           },
           function error(errorResponse) {
              console.log("Error:" + 
                     JSON.stringify(errorResponse));                   
           }
        );
        $scope.addonsActiveClass = "active";
}]);

ng-repeat
<li ng-repeat="phone in phones | filter:query">
          {{phone.name}}
          <p>{{phone.snippet}}</p>
        </li>


External controllers: 
<div ng-app="myApp" ng-controller="personCtrl">

First Name: <input type="text" ng-model="firstName"><br>
Last Name: <input type="text" ng-model="lastName"><br>
<br>
Full Name: {{firstName + " " + lastName}}

</div>


<script src="personController.js"></script>