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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151
7
章
その他の便利な機能
この章では、
AngularJS
に用意されている便利な機能のうち今まで解説がなかった（あるいは説
明が不十分だった）ものをいくつか紹介します。
7.1
$location
AngularJS
の
$location
サービスは今までに何度も登場していますが、いつも「こうしてアク
セスします」「こうして利用します」といった簡単な説明ばかりでした。ここでは、
$location
とは
何者なのかをきちんと解説し、これを利用するべき場合とそうではない場合とを明らかにします。
$location
サービスとは、どのブラウザにも用意されている
window.location
をラップしたも
のです。そうだとすると、
window.location
ではなく
$location
をわざわざ利用することにはど
のような意義があるのでしょうか。
内部状態のグローバルな管理が不要に
内部状態を管理するためのグローバルなオブジェクトとして、
window.location
（他に
も、ブラウザが持つ
window
や
document
の各オブジェクト）はよく使われます。アプリ
ケーションの中でこのようなオブジェクトを一度でも使ってしまうと、テストや保守そ
して開発作業さえもがとても面倒になります（今は違うとしても、長期的には必ずそうな
ります）。
$location
サービスを使うと、このような面倒事は内部に隠蔽されます。また、
ユニットテストではモックを注入することによって現在の
URL
に関するテストも行える
ようになります。
APIの提供 ...
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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.