Book Image

Learning Responsive Data Visualization

By : Christoph Körner
Book Image

Learning Responsive Data Visualization

By: Christoph Körner

Overview of this book

Using D3.js and Responsive Design principles, you will not just be able to implement visualizations that look and feel awesome across all devices and screen resolutions, but you will also boost your productivity and reduce development time by making use of Bootstrap—the most popular framework for developing responsive web applications. This book teaches the basics of scalable vector graphics (SVG), D3.js, and Bootstrap while focusing on Responsive Design as well as mobile-first visualizations; the reader will start by discovering Bootstrap and how it can be used for creating responsive applications, and then implement a basic bar chart in D3.js. You will learn about loading, parsing, and filtering data in JavaScript and then dive into creating a responsive visualization by using Media Queries, responsive interactions for Mobile and Desktop devices, and transitions to bring the visualization to life. In the following chapters, we build a fully responsive interactive map to display geographic data using GeoJSON and set up integration testing with Protractor to test the application across real devices using a mobile API gateway such as AWS Device Farm. You will finish the journey by discovering the caveats of mobile-first applications and learn how to master cross-browser complications.
Table of Contents (16 chapters)
Learning Responsive Data Visualization
About the Author
About the Reviewer

Handle touch and mouse events with ease

Until now, we have always tried to provide both touch and mouse events for users on a mobile device and on PC or television screens. With D3, we treated a touch event exactly as a mouse click event but only with a different interaction radius. However, it can easily happen that a user has both touch (or multi-touch) and a mouse as input devices. In this section, we solve caveats for developers when providing both input types for the user.

Mouse and touch events

Why could we use a mouse click event to also detect finger touches on a touch screen? To answer this question, we will take a look at the execution chains of events on a target DOM element mouse and go into touch-enabled device. We combine them into one execution chain for touching a target element on a touch device with the finger. Here is the list of events that will be propagated:

  • touchstart: The fingertip touches the screen

  • touchmove: The fingertip moves on the screen

  • touchend: The fingertip...