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General Update Pattern - D3v5+ drop-down

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JJimMaltby
Last edited Jun 5, 2022
Created on Jun 5, 2022

This example demonstrates the general update pattern for data joins in D3 v5, using a drop-down menu to switch between datasets of single-letter values rendered as animated text elements. It shows how the `join()` method replaces the older `merge()` pattern to handle enter, update, and exit selections efficiently. The code builds a reusable line chart module using the Pro D3 pattern, with SVG rendering and transitions that animate new elements entering from above, existing elements repositioning, and removed elements exiting downward. It derives from Mike Bostock’s original alphabet example and Rob Moore’s updatable chart approach.

AI-generated description

THE GENERAL UPDATE PATTERN - v5+ in reusable format

USING join() rather than merge().

MB alphabet example: https://bl.ocks.org/mbostock/3808234 https://bl.ocks.org/john-guerra/cabfbaed34d942e4dd81199855e4987f

A vanilla HTML implementation of Rob Moores updateable pattern Towards Updatable https://www.toptal.com/d3-js/towards-reusable-d3-js-charts.

It is derived from Mike Bostock's Towards Reusable Charts (https://bost.ocks.org/mike/chart/) as the source of the foundational principles.

UseS the ProD3 pattern (Pro D3.js Use D3.js to Create Maintainable, Modular, and Testable Charts by Marcos Iglesias https://www.apress.com/gp/book/9781484252024) as the basis for further charts.

MIT Licensed

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