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D3 Practice

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Last edited Dec 26, 2023

Created on Dec 26, 2023

Two parallel D3.js panels demonstrate the effect of a key function during data joins. As a button inserts letters one at a time from the alphabet, both panels update their displayed sequence, but only the lower panel uses a key function in its `.data()` call, allowing D3 to track each letter’s identity across transitions. The upper panel, lacking the key, reuses DOM elements by index, causing letters to shift incorrectly. The example uses `d3.select`, `.join()`, and `.transition()` to animate the horizontal positions of styled `div` elements.

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Learning D3

MIT Licensed

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