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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79
4.4 Web ページの作成
これで、このサーバはポート
8000
でローカルにコンテンツを提供するようになりました。ブラ
ウザに
http://localhost:8000
という
URL
を入力するとこのサーバが提供するサイトにアクセスで
きます。
SimpleHTTPServer
はデモなどにも使えるので便利ですが、多くの基本機能がありません。その
ため、第Ⅳ部で説明するように
Flask
（本書での一押しのサーバ）などの適切な開発（および本
番）サーバの使い方を覚えた方がよいでしょう。
4.4.2
DOM
HTTP
で送る
HTML
ファイルはブラウザ側で
DOM
に変換し、
JavaScript
に適応させることが
できます。なぜなら、このプログラム的な
DOM
は
D3
などのデータ可視化ライブラリの基盤だか
らです。
DOM
は階層的なノードで表されるツリー構造で、トップノードがメインの
Web
ページ
やドキュメントになります。
基本的に、自分で記述してもテンプレートから作成しても、その
HTML
はブラウザでノード
のツリー階層に変換され、各ノードが
HTML
要素を表します。トップノードはドキュメントオ
ブジェクトと呼ばれ、他のすべてのノードは親子関係に従って下っていきます。プログラムでの
DOM
の操作は
jQuery
や強力な
D3
などのライブラリの要なので、構造に関心を持つようにしま
しょう。
DOM
の感触をつかむには、
Chrome Developer
（私のお勧めのツールセット）などの
Web
ツールを使ってツリーの枝を調べることです。
Web
ページに何がレンダリングされていても、 ...
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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.