Interactive General Update Pattern

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Interactive General Update Pattern

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Last edited Mar 31, 2017

Created on Mar 31, 2017

This interactive visualization demonstrates the general update pattern in D3 v4 by stepping through the code line-by-line using arrow key navigation. It shows how D3 selects existing elements with selectAll, binds data with a key function, and manages enter and exit selections when appending or removing circles. Two side-by-side panels display the executing code and a live SVG visualization, with a step-description box explaining each line. The example uses D3’s selection API to update circle styles, showing how the update selection is merged before applying animations.

AI-generated description

An interactive exploration of the general update pattern (with the v4 API). Use the arrow keys to navigate between lines of code.

The goal is to demonstrate repeated loops through a simplified update function, advancing one line at a time. Details like positioning are omitted so as to focus only on 1) what is selected and 2) what exists in the DOM.

From an idea by Alex Engler. Suggestions or feedback welcome.

forked from <a href='http://bl.ocks.org/cmgiven/'>cmgiven</a>'s block: <a href='http://bl.ocks.org/cmgiven/32d4c53f19aea6e528faf10bfe4f3da9'>Interactive General Update Pattern</a>

mit Licensed

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