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Learn D3 1

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Last edited Feb 13, 2024

Created on Feb 13, 2024

This example demonstrates how D3's data join pattern updates circle elements in an SVG as the dataset changes. It first binds an array of two numbers to render a row of circles, then reuses the same selection with a longer array of five numbers, causing the existing circles to update and new ones to enter. The visualization uses the `join()` method in D3 v7 with the `selectAll` and `data` APIs, setting each circle's position via the `cx` attribute based on its bound value. The code runs within a simple container using `select` and creates a fixed 980 by 500 SVG canvas.

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Circles with Black Slate

MIT Licensed

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