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[05] Interactivity - Using React Hooks with D3

✓ Published1🌍 Public
Ggjonor
Last edited Feb 22, 2020
Created on Feb 19, 2020

This interactive bar chart demonstrates how React hooks and D3 v5 work together to create a dynamic, animated visualization. The example uses `useState` and `useEffect` to manage a mutable data array, while D3's `scaleBand`, `scaleLinear`, and `join` method handle the rendering of SVG bars and tooltips. On mouseenter, a tooltip text element appears with data binding, positioned using the band scale’s index value, and animates its opacity and y-position via `transition()`. Buttons trigger data updates—increment, decrement, filter, or append—which re-render the chart through the React state change. The code also demonstrates axis generation with `axisBottom` and `axisRight`, applying a color scale to bar fills based on value.

AI-generated description

2020-w08-3

Tutorials by The Muratorium:

Using React (Hooks) with D3

  • [05] Interactivity
  • Apply selection.on() before transition()
  • On mouseenter, mouseleave events
  • selectAll tooltip and join with single element data
  • For x position, use the index value from the closure, not the index of the tooltip datum
  • Opacity transition to 1
  • Reset animation by removing element on mouseleave
  • Center text with text-anchor="middle" and offset by half bandwidth()
  • join(enter) callback argument to define elements with enter.append()
  • Specify initial tooltip position in enter selection
MIT Licensed

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