Book Image

HTML5 Web Application Development By Example : Beginner's guide

By : Jody Gustafson
Book Image

HTML5 Web Application Development By Example : Beginner's guide

By: Jody Gustafson

Overview of this book

HTML5's new features have made it a real application development platform with widespread adoption throughout the industry for this purpose. Being able to create one application that can run on virtually any device from phone to desktop has made it the first choice among developers. Although JavaScript has been around for a while now, it wasn't until the introduction of HTML5 that we have been able to create dynamic, feature-rich applications rivaling those written for the desktop. HTML5 Web Application Development By Example will give you the knowledge you need to build rich, interactive web applications from the ground up, incorporating the most popular HTML5 and CSS3 features available right now. This book is full of tips, tools, and example applications that will get you started writing your own applications today. HTML5 Web Application Development By Example shows you how to write web applications using the most popular HTML5 and CSS3 features. This book is a practical, hands-on guide with numerous real-world and relevant examples. You will learn how to use local storage to save an application's state and incorporate CSS3 to make it look great. You will also learn how to use custom data attributes to implement data binding. We'll use the new Canvas API to create a drawing application, then use the Audio API to create a virtual piano, before turning it all into a game. The time to start using HTML5 is now. And HTML5 Web Application Development by Example will give you the tips and know-how to get started.
Table of Contents (18 chapters)
HTML5 Web Application Development By Example Beginner's guide
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Time for action – initializing menu items


Next we will initialize the Color menu to set the background color of each item to the color it represents. We could do that in CSS but it would be cumbersome. Instead we are going to write a JavaScript method to set them all with just a little bit of code:

function initColorMenu()
{
    $("#color-menu li").each(function(i, e) {
        $(e).css("background-color", $(e).data("value"));
    });
}

This gets all of the color menu items and iterates over them using the jQuery each() method. For each item it sets the background color using the jQuery css() method to the value of the data-value custom attribute, which is a CSS color name. Just like that we have a menu of colors.

We want to do something similar for the width menu's items, except we will set the bottom border to the width in the data-value custom attribute to give the user some idea of how big the line will be:

function initWidthMenu()
{
    $("#width-menu li").each(function(i, e) {
       ...