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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87
4.6 プレースホルダを含む基本的なページ
4.5.3
その他のツール
Chrome
デベロッパーツールタブの機能は膨大で、ほぼ毎日のように更新されています。メモリ
や
CPU
のタイムラインやプロファイリング、ネットワークダウンロードの監視、さまざまな形式
の要因に対するページのテストを実行します。しかし、データ可視化の作業では、
Elements
タブ
と
Sources
タブに
99 %
の時間を費やすことになるでしょう。
4.6
プレースホルダを含む基本的なページ
Web
ページの主要な要素の説明は済んだので、これからその要素を組み立ててみましょう。ほ
とんどの
Web
可視化は、小さな
JavaScript
とデータで具体化できる状態にあるプレースホルダ要
素を含む
HTML
と
CSS
のスケルトンから始めます（「
4.2
シングルページアプリケーション」を
参照）。
まず
HTML
スケルトンが必要です。ヘッダ、メイン、サイドバーの
3
つのチャート要素を定め
るコンテンツブロック
<div>
のツリーで構成されている例
4-1
のコードを使います。
例
4-1
HTML
スケルトンの
index.html
ファイル
<!DOCTYPE html>
<meta charset="utf-8">
<link rel="stylesheet" href="style.css" type="text/css" />
<body>
図
4-7
Chrome
デベロッパーツールの
Sources
タブ
88
4 章 Web 開発の基本
<div id="chart-holder" ...
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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.