element is the "owner" of an AngularJS application. + * The ng-model directive binds the value of the input field to the application variable name. + * The ng-bind directive binds the innerHTML of the

element to the application variable name. +*/ + Here are content to be intrepreted + +/////////////////////////////////// +// AngularJS Expressions + +// AngularJS expressions are written inside double braces: {{ expression }}. +// AngularJS expressions binds data to HTML the same way as the ng-bind directive. +// AngularJS will "output" data exactly where the expression is written. +// AngularJS expressions are much like JavaScript expressions: They can contain literals, operators, and variables. +// Example {{ 5 + 5 }} or {{ firstName + " " + lastName }} + + + + +

My first expression: {{ 5 + 5 }}

+ + + +//If you remove the ng-app directive, HTML will display the expression as it is, without solving it: + + + + +

My first expression: {{ 5 + 5 }}

+ + + +// AngularJS expressions bind AngularJS data to HTML the same way as the ng-bind directive. + + + + +

Name:

+ + + +// AngularJS numbers are like JavaScript numbers: +

Total in dollar: {{ quantity * cost }}

+ +//AngularJS strings are like JavaScript strings: +

The name is

+ +//AngularJS objects are like JavaScript objects: +

The name is {{ person.lastName }}

+ +//AngularJS arrays are like JavaScript arrays: +

The third result is {{ points[2] }}

+ +// Like JavaScript expressions, AngularJS expressions can contain literals, operators, and variables. +// Unlike JavaScript expressions, AngularJS expressions can be written inside HTML. +// AngularJS expressions do not support conditionals, loops, and exceptions, while JavaScript expressions do. +// AngularJS expressions support filters, while JavaScript expressions do not. + +/////////////////////////////////// +// AngularJS Directives + + +//AngularJS directives are extended HTML attributes with the prefix ng-. +//The ng-app directive initializes an AngularJS application. +//The ng-init directive initializes application data. +//The ng-model directive binds the value of HTML controls (input, select, textarea) to application data. +

Name:

You wrote: {{ firstName }}

+ +//Using ng-init is not very common. You will learn how to initialize data in the chapter about controllers. + +//The ng-repeat directive repeats an HTML element: +

+ {{ x }} +

+ +//The ng-repeat directive used on an array of objects: +

+ {{ x.name + ', ' + x.country }} +

+ +// AngularJS is perfect for database CRUD (Create Read Update Delete) applications. +// Just imagine if these objects were records from a database. + +// The ng-app directive defines the root element of an AngularJS application. +// The ng-app directive will auto-bootstrap (automatically initialize) the application when a web page is loaded. +// Later you will learn how ng-app can have a value (like ng-app="myModule"), to connect code modules. + +// The ng-init directive defines initial values for an AngularJS application. +// Normally, you will not use ng-init. You will use a controller or module instead. +// You will learn more about controllers and modules later. + +//The ng-model directive binds the value of HTML controls (input, select, textarea) to application data. +//The ng-model directive can also: +//Provide type validation for application data (number, email, required). +//Provide status for application data (invalid, dirty, touched, error). +//Provide CSS classes for HTML elements. +//Bind HTML elements to HTML forms. + +//The ng-repeat directive clones HTML elements once for each item in a collection (in an array). + +/////////////////////////////////// +// AngularJS Controllers + +// AngularJS controllers control the data of AngularJS applications. +// AngularJS controllers are regular JavaScript Objects. + +// AngularJS applications are controlled by controllers. +// The ng-controller directive defines the application controller. +// A controller is a JavaScript Object, created by a standard JavaScript object constructor. + +

+ +First Name:
+Last Name:
+
+Full Name: {{firstName + " " + lastName}} + +

+ + + +//Application explained: + +//The AngularJS application is defined by ng-app="myApp". The application runs inside the

. +//The ng-controller="myCtrl" attribute is an AngularJS directive. It defines a controller. +//The myCtrl function is a JavaScript function. +//AngularJS will invoke the controller with a $scope object. +//In AngularJS, $scope is the application object (the owner of application variables and functions). +//The controller creates two properties (variables) in the scope (firstName and lastName). +//The ng-model directives bind the input fields to the controller properties (firstName and lastName). + +//The example above demonstrated a controller object with two properties: lastName and firstName. +//A controller can also have methods (variables as functions): +

+ +First Name:
+Last Name:
+
+Full Name: {{fullName()}} + +

+ + + +//In larger applications, it is common to store controllers in external files. +//Just copy the code between the tags into an external file named personController.js: + +

+ +First Name:
+Last Name:
+
+Full Name: {{firstName + " " + lastName}} + +

+ + + +// For the next example we will create a new controller file: +angular.module('myApp', []).controller('namesCtrl', function($scope) { + $scope.names = [ + {name:'Jani',country:'Norway'}, + {name:'Hege',country:'Sweden'}, + {name:'Kai',country:'Denmark'} + ]; +}); + +//Save the file as namesController.js: +//And then use the controller file in an application: + +

+ +

+ {{ x.name + ', ' + x.country }} +

+ +

+ + + +/////////////////////////////////// +// AngularJS Filers + +// Filters can be added to expressions and directives using a pipe character. +// AngularJS filters can be used to transform data: + +**currency: Format a number to a currency format. +**filter: Select a subset of items from an array. +**lowercase: Format a string to lower case. +**orderBy: Orders an array by an expression. +**uppercase: Format a string to upper case. + +//A filter can be added to an expression with a pipe character (|) and a filter. +//(For the next two examples we will use the person controller from the previous chapter) +//The uppercase filter format strings to upper case: +

+ +

The name is {{ lastName | uppercase }}

+ +

+ +//The lowercase filter format strings to lower case: +

+ +

The name is {{ lastName | lowercase }}

+ +

+ +//The currency filter formats a number as currency: +

+ + + + +

Total = {{ (quantity * price) | currency }}

+ +

+ +//A filter can be added to a directive with a pipe character (|) and a filter. +//The orderBy filter orders an array by an expression: +

+ +

+ {{ x.name + ', ' + x.country }} +

+ +

+ +//An input filter can be added to a directive with a pipe character (|) +//and filter followed by a colon and a model name. +//The filter filter selects a subset of an array: + +

+ +

+ {{ (x.name | uppercase) + ', ' + x.country }} +

+ +

+ +/////////////////////////////////// +// AngularJS AJAX - $http + +//$http is an AngularJS service for reading data from remote servers. + +// The following data can be provided by a web server: +// http://www.w3schools.com/angular/customers.php +// **Check the URL to see the data format** + +// AngularJS $http is a core service for reading data from web servers. +// $http.get(url) is the function to use for reading server data. +

+ +

+ {{ x.Name + ', ' + x.Country }} +

+ +

+ + + +Application explained: + +// The AngularJS application is defined by ng-app. The application runs inside a

. +// The ng-controller directive names the controller object. +// The customersCtrl function is a standard JavaScript object constructor. +// AngularJS will invoke customersCtrl with a $scope and $http object. +// $scope is the application object (the owner of application variables and functions). +// $http is an XMLHttpRequest object for requesting external data. +// $http.get() reads JSON data from http://www.w3schools.com/angular/customers.php. +// If success, the controller creates a property (names) in the scope, with JSON data from the server. + + +// Requests for data from a different server (than the requesting page), are called cross-site HTTP requests. +// Cross-site requests are common on the web. Many pages load CSS, images, and scripts from different servers. +// In modern browsers, cross-site HTTP requests from scripts are restricted to same site for security reasons. +// The following line, in our PHP examples, has been added to allow cross-site access. +header("Access-Control-Allow-Origin: *"); + + +/////////////////////////////////// +// AngularJS Tables + +// Displaying tables with angular is very simple: +

+ + + + + + +

+ +

+ + + +// To sort the table, add an orderBy filter: + + + + + +

+ +// To display the table index, add a with $index: + + + + + + +

+ +// Using $even and $odd + + + + + + + +

+ +/////////////////////////////////// +// AngularJS HTML DOM + +//AngularJS has directives for binding application data to the attributes of HTML DOM elements. + +// The ng-disabled directive binds AngularJS application data to the disabled attribute of HTML elements. + +

+ +

+Button +

+ +

+ +//Application explained: + +// The ng-disabled directive binds the application data mySwitch to the HTML button's disabled attribute. +// The ng-model directive binds the value of the HTML checkbox element to the value of mySwitch. +// If the value of mySwitch evaluates to true, the button will be disabled: +

+ +

+ +// If the value of mySwitch evaluates to false, the button will not be disabled: +

+ +

+ +// The ng-show directive shows or hides an HTML element. + +

+ +

I am visible.

+ +

I am not visible.

+ +

+ +// The ng-show directive shows (or hides) an HTML element based on the value of ng-show. +// You can use any expression that evaluates to true or false: +

I am visible.

+ +/////////////////////////////////// +// AngularJS Events + +// AngularJS has its own HTML events directives. + +// The ng-click directive defines an AngularJS click event. +

+ + + +

+ +

+ + +// The ng-hide directive can be used to set the visibility of a part of an application. +// The value ng-hide="true" makes an HTML element invisible. +// The value ng-hide="false" makes the element visible. +

+ + + +

+First Name:
+Last Name:
+
+Full Name: {{firstName + " " + lastName}} +

+ +

+ + + +//Application explained: + +// The first part of the personController is the same as in the chapter about controllers. +// The application has a default property (a variable): $scope.myVar = false; +// The ng-hide directive sets the visibility, of a

element with two input fields, +// according to the value (true or false) of myVar. +// The function toggle() toggles myVar between true and false. +// The value ng-hide="true" makes the element invisible. + + +// The ng-show directive can also be used to set the visibility of a part of an application. +// The value ng-show="false" makes an HTML element invisible. +// The value ng-show="true" makes the element visible. +// Here is the same example as above, using ng-show instead of ng-hide: +

+ + + +

+First Name:
+Last Name:
+
+Full Name: {{firstName + " " + lastName}} +

+ +

+ + + +/////////////////////////////////// +// AngularJS Modules + +// An AngularJS module defines an application. +// The module is a container for the different parts of an application. +// The module is a container for the application controllers. +// Controllers always belong to a module. + +// This application ("myApp") has one controller ("myCtrl"): + + + + + + +

+{{ firstName + " " + lastName }} +

+ + + + + + +// It is common in AngularJS applications to put the module and the controllers in JavaScript files. +// In this example, "myApp.js" contains an application module definition, while "myCtrl.js" contains the controller: + + + + + + +

+{{ firstName + " " + lastName }} +

+ + + + + + + +//myApp.js +var app = angular.module("myApp", []); + +// The [] parameter in the module definition can be used to define dependent modules. + +// myCtrl.js +app.controller("myCtrl", function($scope) { + $scope.firstName = "John"; + $scope.lastName= "Doe"; +}); + +// Global functions should be avoided in JavaScript. They can easily be overwritten +// or destroyed by other scripts. + +// AngularJS modules reduces this problem, by keeping all functions local to the module. + +// While it is common in HTML applications to place scripts at the end of the +// element, it is recommended that you load the AngularJS library either +// in the or at the start of the . + +// This is because calls to angular.module can only be compiled after the library has been loaded. + + + + + + +

+{{ firstName + " " + lastName }} +

+ + + + + + + +/////////////////////////////////// +// AngularJS Applications + +// AngularJS modules define AngularJS applications. +// AngularJS controllers control AngularJS applications. +// The ng-app directive defines the application, the ng-controller directive defines the controller. +

+ First Name:
+ Last Name:
+
+ Full Name: {{firstName + " " + lastName}} +

+ + +// AngularJS modules define applications: +var app = angular.module('myApp', []); + +// AngularJS controllers control applications: +app.controller('myCtrl', function($scope) { + $scope.firstName= "John"; + $scope.lastName= "Doe"; +}); +``` + +## Source & References + +**Examples +* http://www.w3schools.com/angular/angular_examples.asp + +**References +* http://www.w3schools.com/angular/angular_ref_directives.asp +* http://www.w3schools.com/angular/default.asp +* https://teamtreehouse.com/library/angular-basics/ + +Feedback is welcome! You can find me in: +[@WalterC_87](https://twitter.com/WalterC_87), or +[me@waltercordero.com](mailto:me@waltercordero.com). + -- cgit v1.2.3