April 2014
Intermediate to advanced
220 pages
4h 7m
Japanese
Content preview from AngularJSアプリケーション開発ガイド
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2.3
テンプレートとデータバインディング
21
図2-3 リセットボタンの追加
2.3.3
Unobtrusive JavaScript
JavaScript
開発の経験を積んでゆくと、いずれ誰かに「
Unobtrusive
な
JavaScript
を書こう」と
言われることでしょう。これは
HTML
の中に
click
や
mousedown
などのイベントハンドラをイン
ラインで記述するべきではないということを意味しており、正しい考え方です。
Unobtrusive JavaScript
（
Unobtrusive
は「控えめな」の意）という概念はさまざまに解釈されて
いますが、以下のような原則に基づいてコードを記述しようという点は共通です。
❶
すべてのブラウザが
JavaScript
に対応しているとはかぎりません。ブラウザ上でコードを実
行しなくてもアプリケーションを利用でき、誰もがコンテンツにアクセスできるようにしま
しょう。
❷
通常とは異なる方法でブラウザを利用するユーザーもいます。スクリーンリーダーを利用し
ている視覚障害者や、一部の携帯電話ユーザーは
JavaScript
に依存したサイトを利用できな
いでしょう。
❸
JavaScript
の挙動はプラットフォームに依存します。
IE
がしばしば問題を引き起こすのは有
名ですが、イベント処理のために必要なコードはブラウザごとに異なります。
❹
イベントハンドラはグローバルな名前空間に記述されます。そのため、同名の関数を持った
ライブラリを統合しようとすると大きな問題を招くでしょう。 ...
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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.