Introduction to Visualization Using D3.js.png

In this course, you will learn the fundamentals of D3.js (stands for Data-Driven Documents), which is a JavaScript library mainly used for visualization.

In the first half of the course, you will cover DOM (Document Object Model) manipulation, method chaining, data binding, and data loading.

In the second half, you’ll cover visualization concepts and dive deep into SVG which is used to draw different geometrical shapes. After that, you’ll work with various maps and graphs in order to display your data. Lastly, you’ll learn about network visualization with the help of nodes and links.

By the end of this course, you will have a new, powerful data visualization library at your disposal.

Introduction to Visualization Using D3.js

## Problem statement
Add a tooltip to the treemap already drawn in the *Drawing a Treemap* [lesson](https://www.educative.io/pageeditor/10370001/4609988201807872/6320326233817088). The tooltip should show the name of the continent of the country over which the mouse has hovered.

## Expected output


# Problem statement
Add a tooltip to the treemap already drawn in the *Drawing a Treemap* [lesson](https://www.educative.io/pageeditor/10370001/4609988201807872/6320326233817088). The tooltip should show the name of the continent of the country over which the mouse has hovered.

# Expected output


Can you implement a tooltip in a treemap that will show the name of the continent when we hover over the country in the treemap?

Introduction

D3.js Fundamentals

Scales

Drawing Basic Shapes

Chart Fundamentals

Network Visualization, Hierarchical Data, and Interactivity

Conclusion

Challenge: Add Tooltip to a Treemap

Problem statement

Expected output