AngularJS Essentials

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Chapter 3 For the form, avoid using the name that has already been used inside the ngModel directive; otherwise, we will not be able to perform the validation properly. It would be nice to use some suffix for both the form and the field names as that would help to make things clearer, thus avoiding mistakes. Basic validation The validation process is quite simple and relies on some directives to do the job. The first one that we need to understand is the ngRequired directive. It could be attached to any field of the form in order to intimate the validation process that the field is actually required: In addition to this, we could be a little more specific by using the ngMinlength and ngMaxlength directives. It is really useful to fulfill some kinds of requirements such as defining a minimum or maximum limit to each field. In the following code, we are going to add a basic validation to our parking application. From now on, the field plate will be a required parameter and will also have minimum and maximum limits: [ 63 ] www.it-ebooks.info
Data Handling To finish, we can add a regular expression to validate the format of the plate. This can be done through the ngPattern directive: The result can be evaluated through the implicit object $valid. It will be defined based on the directives of each field. If any of these violate the directives definition, the result will be false. Also, the $invalid object can be used, considering its usefulness, depending on the purpose: Park If the plate is not valid, the following alert should be displayed: The plate is invalid! However, there is a problem with this approach. The alert is displayed even if we type nothing and this might confuse the user. To prevent such situations, there are two properties that we need to understand, which are covered in the next section. [ 64 ] 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
Page 25 and 26: Getting Started with AngularJS
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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 117 and 118: Scope What happens when we change t
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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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