simpleEnterExitUpdate

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simpleEnterExitUpdate

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Last edited Jun 18, 2017

Created on Jun 18, 2017

This example demonstrates how D3’s data join handles enter, update, and exit selections in a simple HTML div chart. It starts with three static divs (Billy, Cindy, Walter) and binds them to a new array of five score objects using a key function that matches by name. The existing divs turn red as the update selection, while Alice, David, and Emily are appended in green via `update.enter()`; the exit selection removes any unmatched elements. The code uses `d3.select`, `selectAll`, and `data` with a custom key function, and applies styles directly via `.style()` rather than SVG or canvas rendering.

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