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

Getting geographical location input


One of the exciting new features in HTML5 is the geolocation API (http://www.w3.org/TR/geolocation-API/). It allows the developer to ask for the user's location. This API allows the developer to get geographic coordinates, such as latitude and longitude.

Before this API developers had to rely on more crude methods, such as GeoIP databases. These methods produced results that had poor accuracy. Depending on the user's browser, device, and the availability of GPS on it, the geolocation API could give results with a few meters accuracy.

In this recipe, we're going to display the user's location on a map. To do this, we're going to use the Leaflet library. The use of this library to show maps is covered in the Displaying a map recipe, Chapter 2, Display of Graphical Data.

How to do it...

Let's get started.

  1. We're going to create a HTML page with a map placeholder, which will include the leaflet library (both CSS and JS files) and our code for getting and displaying...