d3 update() enter() exit()

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d3 update() enter() exit()

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Last edited Jan 12, 2021

Created on Jan 12, 2021

This example demonstrates how D3’s data join updates existing DOM elements and adds new ones. The page initially contains three `<p>` elements for dog, cat, and pig. The code binds an array of five numbers to these paragraphs using `d3.select` and `selectAll`, then calls `data()` to get the update set. Using `update.text()`, it rewrites the existing paragraphs with their new values and indices. The `update.enter()` method appends two new `<p>` elements, each filled with the remaining data values via `append` and `text`. The example showcases D3’s declarative enter/update/exit pattern for syncing data to HTML.

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

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