General Update Pattern

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General Update Pattern

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Last edited May 28, 2021

Created on May 27, 2021

This example demonstrates the general update pattern in D3, using a fruit bowl visualization of apples and lemons. The code renders SVG circles with positions and radii determined by ordinal scales, and animates changes over time. Using `selection.join`-style logic with `enter`, `merge`, and `exit` selections, it handles data updates where fruits are added, removed, or change type. React serves as the framework, while D3 v6 drives the transitions and data binding, with each fruit assigned a unique ID via `Math.random()` for stable keying.

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

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General update pattern

The example demonstrates the D3 general update pattern, animating a row of fruit circles as apples are added, removed, and replaced with lemons over time. It uses d3.select and d3.range to manage data, and the fruitBowl module applies enter, merge, and exit selections with transition.attr to animate circle radius and fill color. Rendering occurs in SVG via a React-free vanilla JavaScript setup, with d3.scaleOrdinal mapping fruit types to colors and sizes. The data consists of a mutable array of fruit objects, each with a random id for keying.

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General Update Pattern --

This example demonstrates the general update pattern in D3 by animating a fruit bowl over time. Apples and lemons are drawn as scaled circles, with colors and radii mapped via `scaleOrdinal`. A sequence of timeouts triggers state changes—removing fruits, replacing an apple with a lemon—and re-renders the SVG. The code uses `selection.selectAll`, `.enter()`, `.merge()`, and `.exit()` to handle the incremental updates.

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