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Introduction to Visualization Using D3.js

Solution Review: Add Tooltip to a Treemap

Explore how to enhance treemap visualizations with interactive tooltips using D3.js. Learn to create events that display information dynamically on hover and hide it when the cursor leaves, improving user interaction and data clarity in hierarchical visualizations.

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Solution

Explanation

As shown in the above code:

  • Lines 46-50: We have defined a tooltip with the text tooltip in it, and we have made it hidden until some event occurs.
  • Lines 74-79: We have defined two event listeners, mouseover and mouseout, and every time we hover over the country, a mouseover event will occur. We will show the parent name of the rectangle, which, in this case, is the name of the continent. We will also make it visible. When we leave the rectangle, the mouseout event will occur and will make the tooltip hidden again.