Book Image

Ionic 2 Cookbook - Second Edition

By : Hoc Phan
Book Image

Ionic 2 Cookbook - Second Edition

By: Hoc Phan

Overview of this book

Developing real-time apps is the need of the hour, and apps that deal with humongous amounts of user data and real-time information that needs to be updated frequently are in high demand. Currently, one of the most popular frameworks for this task is Ionic Framework, which is undergoing a major makeover. This book will get you started with Ionic and help you create Angular 2 components that interact with templates. From there, you’ll work with Ionic components and find out how to share data efficiently between them. You’ll discover how to make the best use of the REST API to handle back-end services and then move on to animating the application to make it look pretty. You’ll learn to add in a local push notification in order to test the app. You’ll work with Cordova to support native functionalities on both iOS and Android. From there, you’ll get to grips with using the default themes for each platform as well as customizing your own. Finally, you’ll see how best to deploy your app to different platforms. This book will solve all your Ionic-related issues through dedicated recipes that will help you get the best out of Ionic.
Table of Contents (16 chapters)
Ionic 2 Cookbook Second Edition
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Creating a custom username input directive


Since you have gone through the process of creating a component in the preceding section, you may wonder what the difference is between a component and a directive. If you have some experience with Angular 1, you may notice that it had no definition of a component. Starting in Angular 2, there are the following three kinds of directive:

Kind

Description

Components

They have a template and a class associated with the component (that is, ion-input)

Structural directives

They change the DOM structure within the scope of where it is (that is, *ngIf or *ngFor)

Attribute directives

They change the appearance of the current DOM by intercepting its display or events

You may have a mix of both structural and attribute characteristics in the same directive. In this section, you will learn how to create an attribute directive that can prevent certain characters from being input in the Username as well as showing another DOM node (where it says You are...