AngularJS Sessions
Introduction
to AJS concepts
è Two way Data Binding
è MVW pattern (Model View Whatever)
è Template
è Custom –directive (Reusable components, Custom
markup)
è REST-friendly
è Deep
linking (Setup a link for any dynamic pages)
è Form Validation
è Server Communication
è Localization
è Dependency injection
è Full testing environment (Both Unit and E2E)
Directives:
Angular comes with a set of these directives
built-in, like ngBind, ngClass and ngModel. Much like you create
controllers and services, you can create your own directives for Angular to
use. When Angular bootstraps your application, the HTML compiler traverses the DOM matching directives against the DOM elements.
è
The ng-app directive initializes an AngularJS
application.
è
The ng-init directive initializes application
data.
è
The ng-model directive binds the value of HTML
controls (input, select, textarea) to application data.
Example:
<div ng-app="" ng-init="firstName='ABC'">
<p>Name: <input type="text" ng-model="firstName"></p>
<p>You wrote: {{ firstName }}</p>
</div>
</div>
Output:
Name: ABC
You
wrote: ABC
Built-In
Directive:
Most useful directives in angularJS:
è ng-app="plaintext"
è ng-controller="plaintext"
è ng-init="expression"
è ng-model="expression"
è ng-include="string"|<ng-include src="string"
onload="expression" autoscroll="expression">
è ng-repeat="([key,] value) in object|array"
è ng-hide|show="boolean"
è ng-submit="expression"
è ng-view|<ng-view>
è ng-bind[-html-unsafe]="expression"
Custom Directive: You can
create your own directive to use in angularJS.
è
Element
directives
è
Attribute
directives
è
CSS class
directives
è
Comment
directives
Example:
myapp.directive('userdirective ', function()
{
var directive = {};
directive.restrict = 'E';
directive.template = "User : {{user.firstName}}
{{user.lastName}}";
directive.scope = {
user : "=user"
}
return directive;
});
Html Page:
<userdirective
user="Ananda"></userdirective >
<userdirective
user="Babu"></userdirective >
Filters:
Filters are used for formatting data displayed to the user.
{{
expression [| filter_name[:parameter_value] ... ] }}
è
amount | currency[:symbol]: Formats
a number as a currency (ie $1,234.56).
è date |
date[:format]
è
array | filter:expression: Selects
a subset of items from array. Expression takes string|Object|function()
è
data | json : Convert a JavaScript object into
JSON string.
è
array | limitTo:limit : Creates
a new array containing only a specified number of elements in an array.
è
text | linky 1: Finds
links in text input and turns them into html links.
è
string | lowercase :
Converts string to lowercase.
è
number | number[:fractionSize] : Formats
a number as text. If the input is not a number an empty string is returned.
è
array | orderBy:predicate[:reverse] :
Predicate is function(*)|string|Array. Reverse is Boolean
è
string | uppercase : Converts
string to uppercase.
Example:
<script>
var app=angular.module("myApp",[]);
app.controller("mtCtrl",fuction($scope){
$scope.firstName ='abc';
$scope.lastName ='ABC';
$scope.quantity=10;
$scope.price=100;
$scope.names=['Anand','Moula','Siva'];
$scope.country=['US','UK','India'];
});
</script>
<div
ng-app="myApp" ng-controller="myCtrl">
<p>The
name is {{ firstName | uppercase }}</p>
<p>The
name is {{ lastName | lowercase }}</p>
<input
type="number" ng-model="quantity">
<input
type="number" ng-model="price">
<p>Total
= {{ (quantity * price) | currency }}</p>
<ul>
<li
ng-repeat="x in names | orderBy:'country'">
{{
x.name + ', ' + x.country }}
</li>
</ul>
<p><input
type="text" ng-model="test"></p>
<ul>
<li ng-repeat="x in names |
filter:test | orderBy:'country'">
{{ (x.name | uppercase) + ', ' + x.country }}
</li>
</ul>
</div>
Data
Binding:
Views, Controllers & Scope
Views:
AngularJS
supports Single Page Application via multiple views on a single page. To do
this AngularJS has provided ng-view and ng-template directives and
$routeProvider services.
ng-view: ng-view tag simply creates a place holder where a
corresponding view (html or ng-template view) can be placed based on the
configuration.
Example:
<div ng-app="mainApp”>
<div ng-view></div>
</div>
Controller: The ngController directive
attaches a controller class to the view. The class contains business logic
behind the application to decorate the scope with functions and values.
Example:
...
</div>
Scope:
It is an object
that refers to the application model. It is an execution context for expressions. Scopes are arranged in
hierarchical structure which mimics the DOM structure of the application.
Scopes can watch expressions and propagate events.
Example:
angular.module('scopeExample',
[])
$scope.username = 'World';
$scope.sayHello = function() {
$scope.greeting = 'Hello ' +
$scope.username + '!';
};
}]);
<div
ng-controller="MyController">
Your name:
<input type="text"
ng-model="username">
<hr> {{greeting}}
</div>
Modules,
Routes, Factories & Services
Module:
You can think of a module as a container for the different
parts of your app – controllers, services, filters, directives, etc.
è An
AngularJS module defines an application.
è A
module is a container for the different parts of an application.
è All
application controllers should belong to a module.
Example:
<script>
var app = angular.module("myApp", []);
app.controller("myCtrl", function($scope) {
$scope.firstName = “Anand";
$scope.lastName = "Moula";
});
</script>
<div ng-app="myApp" ng-controller="myCtrl">
{{ firstName + "
" + lastName }}
</div>
Routes:
The ngRoute module provides routing and
deep linking services and directives for angular apps.
AngularJS routes enable you to create
different URLs for different content in your application. Having different URLs
for different content enables the user to bookmark URLs to specific
content, and send those URLs to friends
etc. In AngularJS each such bookmarkable URL is called a route.
Example:
Views: home.cshtml, about.cshtml,
contact.cshtml
<!-- home.cshtml -->
<div class="cssclass
text-center">
<h1>Home Page</h1>
<p>{{ message }}</p>
</div>
<!-- about.cshtml -->
<div class=" cssclass
text-center">
<h1>About Page</h1>
<p>{{ message }}</p>
</div>
<!-- contact.cshtml -->
<div class=" cssclass
text-center">
<h1>Contact Page</h1>
<p>{{ message }}</p>
</div>
// script.js
var myApp = angular.module('myApp',
['ngRoute']);
myApp.config(function($routeProvider) {
$routeProvider .when('/', {
templateUrl : 'pages/home.cshtml',
controller : 'mainController'
})
// route for the about page
.when('/about', {
templateUrl : 'pages/about.cshtml',
controller : 'aboutController'
})
// route for the contact page
.when('/contact', {
templateUrl : 'pages/contact.cshtml',
controller : 'contactController'
});
});
myApp.controller('mainController',
function($scope) {
$scope.message = 'Everyone come and see
how good I look!';
});
myApp.controller('aboutController',
function($scope) {
$scope.message = 'Look! I am an about
page.';
});
myApp.controller('contactController',
function($scope) {
$scope.message = 'Contact us! Jagan.
This is just a demo.';
});
The when() method takes a path and a route as
parameters. The path is a
part of the URL after the # symbol. The route contains
two properties named templateUrl andcontroller. The templateUrl property tells which HTML template
AngularJS should load and display inside the div with the
ngView directive. The controller property tells which controllers should be
used with the HTML template.
When the application is
loaded, the path is
matched against the part of the URL after the # symbol. If no route paths
matches the given URL the browser will be redirected to the path specified in
the otherwise() function.
Factories:
A factory is a simple function which allows you to add some
logic before creating the object. It returns the created object. When you’re using a Factory you create an object, add properties
to it, then return that same object. When you pass this service into your
controller, those properties on the object will now be available in that
controller through your factory.
Services:
When you’re using Service, it’s instantiated with the ‘new’ keyword.
Because of that, you’ll add properties to ‘this’ and the service will return
‘this’. When you pass the service into your controller, those properties on
‘this’ will now be available on that controller through your service.
Example: Factory and Services
var app =
angular.module('app',[]);
app.service('helloWorldService',
function(){
this.hello = function() {
return "Hello World";
};
});
app.factory('helloWorldFactory',
function(){
return {
hello: function() {
return "Hello World";
}
}
});
Providers:
Providers are the only service you can pass into your
.config() function. Use a provider when you want to provide module-wide
configuration for your service object before making it available.
Example:
var app =
angular.module("app",[]);
app.config(function
($provide) {
$provide.factory("game", function
() {
return {
title: "StarCraft"
};
});
});
app.controller("AppCtrl",
function ($scope, game) {
$scope.title = game.title;
});
Dependency Injection:
Dependency injection is one of AngularJS's best patterns. It
makes testing much simpler, as well as making it more clear upon which any particular
object depends. AngularJS is very flexible on how things can be injected. The
simplest version requires just passing the name of the dependency into the
function for the module:
Example :
var app =
angular.module('app',[]);
app.controller('MainCtrl',
function($scope, $timeout){
$timeout(function(){
console.log($scope);
}, 1000);
});
Localization:
A locale is a specific geographical, political, or cultural
region. The most commonly used locale ID consists of two parts: language code
and country code. For example, en-US, en-AU, and zh-CN are all valid locale IDs that
have both language codes and country codes.
Example: <script
src="l10n/angular-locale_en-in.js"></script> -- This is for India Locale
<script src="l10n/angular-locale_en-us.js"></script> --This is for US Locale
No comments:
Post a Comment