Shopping App Tester

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Shopping App Tester

✓ Published0🌍 Public

Last edited Oct 5, 2017

Created on Oct 5, 2017

This example demonstrates the General Update Pattern for handling dynamic data in D3.js v4, rendered as SVG bar charts. The visualization shows how a shopping app's grocery items (banana, eggs, peanut butter) with price values are displayed as horizontal bars whose widths correspond to price. The code uses `d3.scaleBand` for vertical positioning and `d3.scaleLinear` for width scaling, with `selection.merge()` to combine enter and update selections. Timed tests reveal problems: changing a price only updates the bar's width, while removing an item fails to properly update remaining bars, illustrating common update-pattern pitfalls.

AI-generated description

This example shows the General Update Pattern, which is required to create things with D3.js that update with dynamic data.

Part of the video course: D3.js in Motion.

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