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General Update Pattern Notes

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Aanqi-lu
Last edited Oct 13, 2017
Created on Oct 9, 2017

This example demonstrates D3’s general update pattern by binding an array of numbers to rectangle elements in an SVG canvas. The code calls the render function three times—first with one value, then with five, and finally with an empty array—to show how the enter, update, and exit selections add, modify, and remove rectangles accordingly. It uses d3.select, selection.data, selection.enter, selection.exit, and selection.merge to manage the transitions between states. The rectangles are positioned horizontally by their data values, with a fixed vertical offset and dimensions.

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