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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360
16 章 D3 入門
−
棒グラフ
はそのような要素はありません。棒がなければ、一体何にデータをバインディングするのでしょう
か。実は、
D3
は水面下でデータを管理しているのです。重要なこととして、
data
が返す
bars
オ
ブジェクトは
nobelData
をバインディングする
DOM
要素を知っていますが、
nobelData
はバイン
ディングされていません。次に、基本的な
enter
メソッドの使用方法を説明します。
16.7
enter
メソッド
D3
の
enter
（
https://github.com/d3/d3/blob/master/CHANGES.md#selections-d3-
selection
）メソッド（およびその仲間の
exit
）は
D3
の優れた能力と表現力の基盤であると同時
に、多くの混乱の元でもあります。
D3
のスキルを伸ばしたければ、このメソッドに深いレベルで
真剣に向き合うべきです。ここでは、単純な例を紹介しましょう。
標準的で単純な小さなデモから始め、ノーベル賞データの各メンバーに棒の長方形を追加しま
す。バインディングするデータとして上位
6
つの受賞国を使います。
var nobelData = [
{key:'United States', value:200},
{key:'United Kingdom', value:80},
{key:'France', value:47},
{key:'Switzerland', value:23},
{key:'Japan', value:21}, ...
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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.