Workshop 12: AngularJS Parte I

AngularJS - Part I Cristina Hernández Roger Vilà

Index ● What is AngularJS? Why Angular JS? ● History of AngularJS ● Angular JS Patterns ● Introduce to AngularJS Code ● Invoking Angular JS ● DataBinding in AngularJS ● Expressions ● Directives ● Filters ● Modules ● Controllers ● Services ● Forms ● Application example

“Angularjs is what HTML would have been if it had been designed for building web applications” https://angularjs.org/

What is Angular JS? AngularJS is an open-source web application framework for client-side MVC and MVVM architectures. Why Angular JS? HTML is great for declaring static documents, but it falters when we try to use it for declaring dynamic views in web- applications. Angular JS lets you extend HTML vocabulary for your application

History of Angular JS AngularJS was originally developed in 2009 by Misko Hevery at Brach Tech LLC. Created at Google as internal project. AngularJS version 1.0 was released in 2012. Currently working on 1.4.9 Angular JS 2 (Beta) https://en.wikipedia.org/wiki/AngularJS

MVC - Model View Controller VIEW MODEL CONTROLLER - Renders the Model data - Sends user actions/events to controller - UI - Defines application behaviour - Maps user actions to Model - Selects view for response - Business Logic - Notifies view changes - Data in general User Action or View Load Maps to particular Model after fetching the data Implements the Business Logic on response data and binds it to View

Model Entire model contained in a single javascript data structure. var obj = { employeeName: "Mattias", company: "Net Insight AB" }

Controller Javascript code that populates the view and reacts to changes in it. function myCtrl( $scope ) { $scope = { employeeName: "Mattias", company: "Net Insight AB" }; $scope.save_info = function() { console.log( $scope.employeeName ); }; }

View "Extended" html. Dynamic and syncronized <div ng-controller = myCtrl> <h2>{{company}}</h2> Employee name: <input ng-model="employeeName"></input> <button ng-click="save_info()" >Submit</button> </div>

Invoking Angular Any application must do two things to start Angular: 1) Load the angular.js library 2) Tell Angular which part of the DOM it should manage with the ng-app directive <script type=”text/javascript” src=”angular.min.js” /> <html> <div ng-app> … </div> ... </html> <html ng-app> .... </html>

Client-Side templates controllers.js: function HelloController($scope) { $scope.greeting = { text: 'Hello' }; } hello.tml: <html ng-app> <head> <script src="angular.js"></script> <script src="controllers.js"></script> </head> <body> <div ng-controller='HelloController'> <p>{{greeting.text}}, World</p> </div> </body> </html> Result: Hello, World

Data Binding - One-way binding: Binding from scope to HTML. “Mustache” syntax {{dato}} Two-way binding: Binding from scopel to HTML, and binding from HTML to scope <input type="text" ng-model="miDato" />

Two-Way Data Binding hello.html <html ng-app> <head> <script src="angular.js"></script> <script src="controllers.js"></script> </head> <body> <div ng-controller='HelloController'> <input ng-model='greeting.text'> <p>{{greeting.text}}, World</p> </div> </body> </html> controllers.js: function HelloController($scope) { $scope.greeting = { text: 'Hello' }; } Hello Hello, World https://docs.angularjs.org/guide/databinding

Expressions Allow you to insert dynamic values into your HTML AngularJS expressions can be written inside double braces: {{expression}} Angular JS expressions can be written inside a directive: ng-bind=”expression” 1) Numerical Operations {{ 4 + 6}} → 10 2) String Operations {{“hello” + “ you”}} → hello you https://docs.angularjs.org/guide/expression

Directives Directives are ways to expand our html. They allow you to add from small pieces of code or full functionality Angular comes with a set of these directives built in, like: ● ng-app ● ng-controller ● ng-model ● ng-bind ● ng-repeat ● ng-init ● ng-show/ng-hide ● ng-class ● ng-click ● ng-form ● ng-submit ● ng-if ● ng-href ● ng-src ● custom directives (Next workshop) https://docs.angularjs.org/api/ng/directive/

ng-model With the ng-model directive you can bind the value of an input field to a variable created in AngularJS <div ng-app="myApp" ng-controller="myCtrl"> Name: <input ng-model="name"> </div> <script> var app = angular.module('myApp', []); app.controller('myCtrl', function($scope) { $scope.name = "John Doe"; }); </script>

ng-repeat <h3>FIFA Golden Ball:</h3> <div ng-app ng-controller="MyCtrl"> <ul> <li ng-repeat="player in players">{{name}}: {{num}}</li> </ul> </div> function MyCtrl($scope) { $scope.players = [ { name: “Roger” num: 6 }, { name: “Messi” num: 5 }, { name: “Cristiano Ronaldo” num: 3 } ]; }

ng-show / ng-hide The ng-show / hide directive shows or hides the given html based on the expression provided in the ng show/hide attribute Click me: <input type="checkbox" ng-model="checked"> <div> Show: <div class="animate-show" ng-show="checked"> <span class="glyphicon glyphicon-thumbs-up"></span> I show up when your checkbox is checked. </div> </div> <div> Hide: <div class="animate-show" ng-hide="checked"> <span class="glyphicon glyphicon-thumbs-down"></span> I hide when your checkbox is checked. </div> </div>

Filters ● Angular filters format data for display to the user. {{ expression [| filter_name[:parameter_value]...] }} {{ totalCost | currency }} ● Filters can be chained and can take optional arguments. {{ totalCost | currency | filter2 | filter3 }} {{ totalCost | currency:”USD$” }}

Built-in Filters ● filter ● currency ● number ● date ● json ● lowercase ● uppercase ● limitTo ● orderBy https://docs.angularjs.org/api/ng/filter

Filters <div ng-init="friends = [{name:'John', phone:'555-1276'}, {name:'Mary', phone:'800-BIG-MARY'}, {name:'Mike', phone:'555-4321'}]"></div> <label>Search: <input ng-model="searchText"></label> <table id="searchTextResults"> <tr><th>Name</th><th>Phone</th></tr> <tr ng-repeat="friend in friends | filter:searchText | orderBy:'name'"> <td>{{friend.name}}</td> <td>{{friend.phone}}</td> </tr> </table>

Filters in Javascript $filter(‘number’)(15,5) {{ 15 | number:5 }}

Modules - Where we write pieces of our Angular application. - Makes our code more maintainable, testable and readable. - Where we define dependencies for our app

Modules var app = angular.module(‘moduleName’, [] ); Dependencies Creating: Including the module: <html ng-app=”moduleName”> .... </html> <html> <div ng-app=”moduleName”> … </div> ... </html>

Modules var app = angular.module(‘moduleName’, [] ) .config(function () { ... }).run(function () { ... }); app.controller(function(){ … }); app.service(function(){ … }); app.directive(function(){ … });

Controllers Controllers are where we define our app’s behavior by defining functions and values. app.controller('ViewCtrl', ['$scope', '$location', 'recipe', function($scope, $location, recipe) { $scope.recipe = recipe; $scope.edit = function() { $location.path('/edit/' + recipe.id); }; }]); <html> <div ng-controller=·ViewCtrl”> … </div> ... </html>

$scope Scope is an object that refers to the application model. VIEW CONTROLLER$scope <input type=”text” ng-model=”name” /> function SimpleController($scope) { $scope.name = “Leo”; }

Services Services are singletons objects that are instantiated only once per app. Services are used to organize and share code across your app. Controllers are view-specific, services are app- specific.

Built-in Services ● $http ● $q ● $window ● $location ● ...

Built-in Services - $http var xmlhttp = new XMLHttpRequest(); xmlhttp.onreadystatechange = function() { if (xmlhttp.readystate == 4 && xmlhttp.status == 200) { var response = xmlhttp.responseText; } else if (xmlhttp.status == 400) { // Handle error gracefully } }; // Setup connection xmlhttp.open(“GET”, “http://myserver/api”, true); // Make the request xmlhttp.send(); $http.get('api/user', {params: {id: '5'} }).success(function(data, status, headers, config) { // Do something successful. }).error(function(data, status, headers, config) { // Handle the error });

Forms Forms and controls provide validation services, so that the user can be notified of invalid input. This provides a better user experience. <div ng-form=”loginForm” > <input type=”text” ng-model=”user.name” name=”uName” required /> <button ng-click=”update(user)” ng-disabled=”loginForm.$invalid”> SAVE </button> </div>

Debugging Batarang → Google Chrome Extension

Workshop 12: AngularJS Parte I

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Workshop 12: AngularJS Parte I