Demonstrate d3 enter-update-exit pattern for divs

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Demonstrate d3 enter-update-exit pattern for divs

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Last edited Feb 21, 2020

Created on Feb 21, 2020

This visualization demonstrates the D3.js enter-update-exit pattern by dynamically updating a map legend in response to user selection. It uses a dropdown menu to switch between showing pick-ups, drop-offs, or both, and calls `d3.select` with `.data()` to bind new legend data. The code manually manages transitions: `enter()` appends new divs and spans, then updates existing elements' classes and HTML text, while `exit().remove()` deletes obsolete items. Each legend item is rendered as a colored span with a text label, and the legend updates in place without rebuilding the entire container.

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