AngularJS Essentials

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Now, if we want to obtain a specific car, we need to add some parameters to this URL, and again, the lack of standard makes things harder: GET /retrieveCar?carId=10 HTTP/1.1 GET /getCar?idCar=10 HTTP/1.1 GET /giveMeTheCar?car=10 HTTP/1.1 Chapter 4 Introduced a long time ago by Roy Fielding, the REST method, or Representational State Transfer, has become one of the most adopted architecture styles in the last few years. One of the primary reasons for all of its success is the rise of the AJAX-based technology and also the new generation of web applications, based on the frontend. It's strongly based on the HTTP protocol by means of the use of most of its methods such as GET, POST, PUT, and DELETE, bringing much more semantics and providing standardization. Basically, the primary concept is to replace the verbs for nouns, keeping the URLs as simple and intuitive as possible. This means changing actions such as retrieveCars, listCars, and even getCars for the use of the resource cars, and the method GET, which is used to retrieve information, as follows: GET /cars HTTP/1.1 Also, we can retrieve information about a specific car as follows: GET /cars/1 HTTP/1.1 The POST method is reserved to create new entities and also to perform complex searches that involve a large amount of data. This is an important point; we should always avoid transmitting information that might be exposed to encoded errors through the GET method, as long as it doesn't have a content type. This way, in order to create a new car, we should use the same resource, cars, but this time, with the POST method: POST /cars HTTP/1.1 The car information will be transmitted within the request body, using the desired format. The major part of the libraries and frameworks works really well with JSON, also known as JavaScript Object Notation, which is a lightweight data interchange format. [ 77 ] www.it-ebooks.info
Dependency Injection and Services The following code shows an object literal after being converted into JSON through the JSON.stringify function: { } "plate": "6MBV006", "color": "Blue", "entrance": "2013-12-09T23:46:15.186Z" Also, the framework provides a built-in function called angular.toJson that does the same job of converting an object literal to JSON. To perform the other way round, we can use the angular.fromJson function, which is equivalent to the JSON.parse function. To change any entity that already exists, we can rely on the PUT method, using the same concepts used by the POST method. PUT /cars/1 HTTP/1.1 Finally, the DELETE method is responsible for deleting the existing entities. DELETE /cars/1 HTTP/1.1 Another important thing to keep in mind is the status code that is returned in each response. It determines the result of the entire operation and must allow us to implement the correct application behavior in case there is an error. There are many status codes available in the HTTP protocol; however, we should understand and handle at least the following: • 200 OK • 400 Bad Request • 401 Unauthorized • 403 Forbidden • 404 Not Found • 500 Internal Server Error In case of an error, the response must bring the associated message, explaining what's happening and allowing the developers to handle it. There are many other concepts involving REST. This is just a brief overview and as it is not the purpose of this book, you can consider studying it from a more specific source. [ 78 ] www.it-ebooks.info
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AngularJS Essentials Copyright © 2
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About the Author Rodrigo Branas is
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About the Reviewers Andrei M. Eichl
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Table of Contents The ngIf directiv
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Table of Contents Chapter 7: Unit T
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Preface Only 2 months later, I laun
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Preface A block of code is set as f
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Preface Piracy Piracy of copyright
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Getting Started with AngularJS This
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Getting Started with AngularJS The
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Getting Started with AngularJS
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Getting Started with AngularJS app.
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Creating Reusable Components with D
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Page 67 and 68: Data Handling The following code is
Page 69 and 70: Data Handling Now, the output will
Page 71 and 72: Data Handling The expected result i
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Page 75 and 76: Data Handling Now, let's introduce
Page 77 and 78: Data Handling To finish, we can add
Page 79 and 80: Data Handling The plate must start
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Page 117 and 118: Scope What happens when we change t
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Page 129 and 130: Modules The UI module The UI module
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Page 135 and 136: Unit Testing The topics that we'll
Page 137 and 138: Unit Testing car.entrance = new Dat
Page 139 and 140: Unit Testing parkingService = _park
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Unit Testing Filters Next, we are g
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Unit Testing Creating the element w
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Unit Testing '' + '' + 'Please info
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Unit Testing $httpBackend.flush();
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Unit Testing var _saveCar = functio
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Unit Testing At the moment, we have
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Unit Testing R
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Unit Testing 'src/parkingCtrl.js',
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Automating the Workflow Installatio
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Automating the Workflow grunt.initC
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Automating the Workflow } }); dist:
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Automating the Workflow } }, lib: {
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Automating the Workflow Cache The r
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directives 129 filters 128 service
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installation, Grunt 146 installatio
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two-way data binding $apply functio
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Dependency Injection with AngularJS
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AngularJS Essentials

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