AngularJS Essentials

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Data Handling Most applications demand an intense development effort in order to provide a better interaction with its users. Bringing simplicity and usability is a huge challenge, and as our world is changing at the speed of the light, we must rely on a technology that really allows us to achieve this mission with the least amount of code and pain possible. In terms of data handling, AngularJS offers a complete set of technologies that are capable of accomplishing any challenge related to presenting, transforming, synchronizing, and validating data on the user's interface. All this comes with a very simple syntax that can radically shorten the learning curve. In this chapter, we will talk about data handling using AngularJS. The following topics will be covered in this chapter: • Expressions • Filters • Form validation Expressions An expression is a simple piece of code that will be evaluated by the framework and can be written between double curly brackets, for example, {{car.plate}}. This way of writing expressions is known as interpolation and allows you to easily interact with anything from the scope. www.it-ebooks.info
Data Handling The following code is an example that we have already seen before. Here, we are using it to retrieve the value of the car's plate, color, and entrance, and this is done inside the ngRepeat directive: index.html Plate Color Entrance {{car.plate}} {{car.color}} {{car.entrance}} In our example, for each iteration of the ngRepeat directive, a new child scope is created, which defines the boundaries of the expression. Besides exhibiting the available objects in the scope, the expressions also give us the ability to perform some calculations such as {{2+2}}. However, if you put aside the similarities with JavaScript's eval() function, which is also used to evaluate expressions, AngularJS doesn't use the directive explicitly. The expressions also forgive the undefined and null values, without displaying any error; instead, it doesn't show anything. [ 54 ] 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
Page 15 and 16: Preface Only 2 months later, I laun
Page 17 and 18: Preface A block of code is set as f
Page 19 and 20: Preface Piracy Piracy of copyright
Page 21 and 22: Getting Started with AngularJS This
Page 23 and 24: Getting Started with AngularJS The
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Page 31 and 32: Creating Reusable Components with D
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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 77 and 78: Data Handling To finish, we can add
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Scope What happens when we change t
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Scope if (newValue == oldValue) ret
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Scope ng-model="username" placehold
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Scope Consider the following code s
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Scope Now, we need to start tickGen
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Modules The UI module The UI module
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Modules }, template: "" + "{{title}
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Modules A major part
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Unit Testing The topics that we'll
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Unit Testing car.entrance = new Dat
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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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