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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332
15 章 可視化
};
}(window.nbviz = window.nbviz || {})); #
❹
❶ 変数をグローバルとして定義することで、
JSLint
（
http://www.jslint.com/
）エラーの発生を防ぐ。
❷
ECMAScript 5
の厳格モード（優れたサニティチェック）を課す。
❸ この関数を共有の
nbviz
名前空間の一部として他のスクリプトに公開する。
❹ 存在する場合は
nbviz
オブジェクトを使い、存在しなければ作成する。
以降の章では、可視化要素の作成に使う
JavaScript
と
D3
について詳しく説明します。最初に、
Nobel-viz
を通じて（データ）サーバからクライアントブラウザへのデータの流れと、クライアン
ト内でのユーザインタラクションによるデータの流れを取り上げます。
15.4.2
基本的なデータの流れ
複雑なプロジェクトでデータを扱う方法は数多くあります。インタラクティブなアプリケーショ
ンやデータ可視化で最も確実なパターンは、中央データオブジェクトで現在のデータをキャッシュ
する方法です。キャッシュされたデータのほかに、このデータセットのアクティブな反映やサブ
セットもメインデータオブジェクトに格納されています。例えば、
Nobel-viz
ではユーザはデータ
の複数のサブセットを選択できます（例えば、物理学賞の受賞者のみなど）。
ユーザが
1
人当たりの受賞者数を選択するなどして異なるデータ反映が生じると、フラグ
†
が設
定されます（この例では、
valuePerCapita ...
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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.