Book Image

Sencha Touch Cookbook

By : Ajit Kumar
Book Image

Sencha Touch Cookbook

By: Ajit Kumar

Overview of this book

Sencha touch is a versatile HTML5-based framework for developing mobile web apps that look and feel native on touch screen devices, and with it you can write your code once and deploy it to both iOS and Android saving you both time and money. The Sencha touch cookbook has a comprehensive selection of recipes covering everything from installation right through to HTML5 geo location. The Sencha Touch Cookbook really is your one stop resource for cross platform HTML5 application development. It covers the basics such as setting up an iOS and Android development environment right through to much more complex development issues such as touch gestures, animation, rich media and geo location. Every recipe is practically focused. Maximum action. Minimum theory.
Table of Contents (17 chapters)
Sencha Touch Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Defining the custom validation


In the previous recipe, we saw out-of-the-box validations available in Sencha Touch. However, for various practical reasons, we may have a need to create additional validation rules and use them across the application. For example, the payment amount must not be negative; date must be prior to today's date, and so on.

In this recipe, we will go through the steps to create a new validation rule and use it in the application.

Getting ready

Make sure that you have set up your development environment by following the recipes outlined in Chapter 1.

How to do it...

Carry out the following steps:

  1. Create and open a new file named ch05_07.js and paste the following code into it:

    Ext.setup({
        onReady: function() {
        
      Ext.apply(Ext.data.validations, {
    
        checkdateMessage: 'date is not within the allowed range',
        checkdate: function(config, value) {
          if (value === undefined) {
            return false;
          }
    
          var graceDays = Ext.isEmpty(config.grace) ? 1...