Book Image

HTML5 Data and Services Cookbook

Book Image

HTML5 Data and Services Cookbook

Overview of this book

HTML5 is everywhere. From PCs to tablets to smartphones and even TVs, the web is the most ubiquitous application platform and information medium bar. Its becoming a first class citizen in established operating systems such as Microsoft Windows 8 as well as the primary platform of new operating systems such as Google Chrome OS. "HTML5 Data and Services Cookbook" contains over 100 recipes explaining how to utilize modern features and techniques when building websites or web applications. This book will help you to explore the full power of HTML5 - from number rounding to advanced graphics to real-time data binding. "HTML5 Data and Services Cookbook" starts with the display of text and related data. Then you will be guided through graphs and animated visualizations followed by input and input controls. Data serialization, validation and communication with the server as well as modern frameworks with advanced features like automatic data binding and server communication will also be covered in detail.This book covers a fast track into new libraries and features that are part of HTML5!
Table of Contents (21 chapters)
HTML5 Data and Services Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Advanced use of built-in constraints and custom validations


So far, we have already used some of the built-in validation mechanisms. Now we are going to take a deeper look at some of them, and how we can add our own customization. We will change the style and apply some more advanced checks as well, when we will see how we can disable validation on certain elements by creating a form that has most of these features.

Note

The current working draft version for the form validation can be found at http://www.whatwg.org/specs/web-apps/current-work/multipage/forms.html#client-side-form-validation.

How to do it...

We will create a form that will have error messages styled using CSS, and custom validation using HTML and JavaScript as follows:

  1. We will start off by creating the head section, where we will include example.css, where the CSS file will contain selectors for the input elements with valid, invalid, optional, and required state:

      <head>
        <title>Built In Validation</title&gt...