Book Image

Rhomobile Beginner's Guide

By : Abhishek Nalwaya
Book Image

Rhomobile Beginner's Guide

By: Abhishek Nalwaya

Overview of this book

The four Rhomobile products – Rhodes, Rhosync, RhoHub, and Rhogallery – provide a complete toolkit for creating a mobile application. Rhomobile is cross-platform and so allows you to build your application for many different types of smartphone – including iPhone and Blackberry – just with a single codebase. This makes it the most preferred and quickest way of developing mobile apps. As you create a native Rhomobile application, you can use the built-in device features such as GPS, Push, and Camera, all with offline capabilities.Rhomobile Beginner's Guide is filled with practical examples to help you to create a mobile application from scratch. You can choose on which operating system to build, as well as for which smartphone to develop your application, giving you the freedom to create a customized mobile application quickly and easily.Once you have learned how to install Rhomobile on Windows, Mac, or Linux, you will create a simple application, which will be used to explore the products of Rhomobile one by one. Things really get going when you write unit test cases for your application before deploying it to the server and making builds for your chosen Smartphone. You will learn about the different aspects of Rhomobile, starting with Rhodes 3, which helps you to build a native mobile application. Rhosync 2.1 carries out the offline device capabilities and RhoHub deploys the code on the server and creates a build for the different smartphones. Rhomobile Beginner's Guide gives you the freedom to create a mobile web application on the platform of your choice, for the smartphone of your choice.
Table of Contents (17 chapters)
Rhomobile Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Metadata validation


In the earlier section, we have learned to create input fields using metadata, but an application would definitely need validation checks to be implemented to make it less prone to errors. Metadata provides an easy way to implement validation in the RhoSync application. Validation is expressed as a key added to an existing metadata definition. Below is a sample showing all of the validations that can be used.

Following options are available with Validation:

  • :regexp

  • :validators

  • :min_len

  • :max_len

  • :min_value

  • :max_value

This is the simple code that we have to add validation:

:validation => {
   :regexp = "^.+$",
   :validators = [:required, :number, :currency, :email, :phone],
   :min_len = 0,
   :max_len = 100,
   :min_value = 10,
   :max_value = 1000
}

Now, to get the errors while validating, use the following code:

errors = validate(SourceName.metadata['validation'],@params)

validate method is available with rhodes-translator, which will form custom error messages depending...