Data Joins

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Last edited May 1, 2024

Created on May 1, 2024

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This example demonstrates D3 data joins by binding a dataset of country-weight pairs to SVG elements across two canvases. It starts by selecting and restyling existing rectangles with D3’s `select` and `attr`, then appends circles manually before using `data()` and `join()` to automatically create new circles mapped from the array’s `size` and `weight` values. The code also shows data transformation with `forEach`, grouping countries into weight arrays, and renders everything as SVG in a React setup using D3 v7.

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A bare minimum HTML page demonstrating use of CSS and JavaScript.

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