August 2017
Intermediate to advanced
500 pages
12h 3m
Japanese
Content preview from PythonとJavaScriptではじめるデータビジュアライゼーション
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365
16.9 更新パターン
DOM
要素へデータオブジェクトをバインディングし、そのデータを使って要素の追加や変更を
行う方法を理解したので、データの変更に伴って可視化を更新してみましょう。ここで学ぶ更新パ
ターンは
D3
を効果的に利用するための核で、これまでに目にした優れた
D3
デモのほとんどでこ
の更新パターンかそれに準ずるパターンが採用されています。
16.9
更新パターン
前節では
DOM
にデータをバインディングし、
DOM
を使って要素の追加や挿入を行い、データ
駆動関数で要素の属性を変更する方法を示しました。ここでは、これらの概念を組み合わせ、新し
いデータを使って更新できユーザドリブンの変更と完全なインタラクティブ性を可能にするグラフ
や可視化を作成します。これを実現するために、
D3
の中心的な概念の
1
つのデータ結合（
http://
bost.ocks.org/mike/join/
）を利用した更新パターンを採用します。
enter
メソッドでは、既に
データ結合手法の動作の半分を紹介しました。ここでは
enter
が対となる
exit
と一緒にどのよう
に機能して更新パターンを作成するかを説明します
†
。
1 つのデータバインディング処理で 1 回限りのグラフの構築を想定しているかもしれませんが、
「データを動的に変更する必要があったらどうなるだろうか」と自問する習慣を身に付けるとよいで
しょう。答えがすぐにわからなければ、おそらくその D3 設計は不適切です。自分自身の状況がわか
れば、コードの見直しを実施し、事態が悪化する前に必要な変更を行うことができます ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.