February 2013
Intermediate to advanced
380 pages
7h 45m
Japanese
Content preview from Nodeクックブック
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145
レシピ 5.2 socket.io を使ったシームレスなフォールバック
対してサーバから
socket.io
！という文字列が返されると、
socket
オブジェクトの
message
イベ
ントが発生し、コールバックの
msg
パラメータに格納されたメッセージを
div#output
に出力しま
す。
socket.io
は
WebSocket API
に基づいて実装されています。ミニレシピで
socket.io
の機能を
いくつか紹介します。
関連するレシピ
●
「レシピ
3.3
Ajax
によるブラウザ・サーバ間のデータ転送」
●
「レシピ
5.3
socket.io
越しにコールバック関数を実行する」
●
「レシピ
5.4
socket.io
でリアルタイムウィジェットを作成する」
ミニレシピ
5.2.1
カスタムイベント
socket.io
は、
message
や
connect
、
disconnect
など、あらかじめ設定されているイベントの他
に、カスタムイベントを設定することができます。
emit
メソッドを用いてカスタムイベントを発
生させ、あらかじめ設定されているイベントと同様に
on
メソッドで待機しておくことができます。
本レシピでは、サーバからクライアントに向けて
emit
でカスタムイベントを送り、そしてクラ
イアントから別のカスタムイベントを発生させてサーバに返します。
新しいディレクトリに、レシピ
5.2
の
server.js
と
client.html
をコピーしておいてください。
server.js
の
connection
イベントハンドラと、
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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.