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Enter, Update, Exit

✓ Published0🌍 Public
AAjayyy
Last edited Apr 9, 2019
Created on Apr 9, 2019

The example demonstrates D3's enter, update, and exit selections for data-driven SVG rendering. It generates random scatterplot points and binds them to circles and text labels using an `id` key, visually encoding state changes in blue (new points), green (updated positions), and red (points being removed). The code uses `selection.enter()`, `selection.exit()`, and `transition.attrTween` to animate point placement and opacity over one second. A table below synchronizes with the same data join, and a button triggers new random datasets.

AI-generated description

D3.jsをセレクターを用いた差分レンダリング

D3のセレクターは、単にDOM上に存在しているエレメントを選択するだけでなく、エレメントに束縛したデータをチェックし差分を抽出する機能があります。 以下３種類のセレクターを用いることで、jsxのような差分レンダリングを行うことができます。

update - 束縛したデータに対してすでにDOM存在しているエレメントを選択するセレクター enter - これから新たに追加するエレメントを選択するセレクター exit - データの数に対して多すぎるエレメントを選択するセレクター

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