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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5.5
レスポンスの横取り
127
deferred.promise.then(fetchUser)
.then(fetchUserPermissions)
.then(fetchUserListData)
.then(function(list) {
//
データのリストに対して、何らかの処理を行います
}, function(errorReason) {
//
すべてのエラーをこの
1
箇所で処理できます
});
複雑な階層構造は解消され、連鎖のためのスコープや集中的なエラー処理も実現されています。
AngularJS
の
$q
サービスをインクルードすれば、どんなアプリケーションでもこのコードのよう
に非同期処理を行えます。また、この仕組みにはレスポンスインターセプタというとても便利な機
能も含まれています。
5.5
レスポンスの横取り
これまでの解説では、サーバの呼び出しやレスポンスの解釈、優れた抽象化レイヤーによるレス
ポンスのラッピング、非同期処理などを紹介してきました。しかし、実際のアプリケーションでは
サーバ呼び出しのたびに何らかの処理（エラー処理、認証、有害なデータの除去など）を行うこと
がよくあります。
$q
の
API
に精通すると、このような処理はすべてレスポンスインターセプタと呼ばれる仕組み
を使って行えることがわかります。レスポンスインターセプタを使うと、アプリケーションに渡さ
れる前のレスポンスを横取りできます。データの変換やエラー処理など、ありとあらゆる操作を行
えます。
次の例では、レスポンスを横取りしてちょっとした処理を行っています。 ...
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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.