February 2013
Intermediate to advanced
380 pages
7h 45m
Japanese
Content preview from Nodeクックブック
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
158
5 章 Websocket を使って Ajax を超える
のリアルタイム訪問者カウントを行います。
totals
オブジェクトを使ってカウントを保持します。新しい
origin
が発生するたびに、
origin
の値を初期値
0
のプロパティとして
totals
オブジェクトに追記します。
connection
イベントが発
生するたびに、
totals[origin]
の値に
1
を追加します。
disconnect
イベントも待機しておき、発
生するたびに
1
を引きます。
totals
の値がサーバでしか使えない場合は、このソリューションは完成しているとは言えませ
ん。これらの値をサイトごとに、サイトに接続しているブラウザに提供する方法が必要です。
socket.io
のバージョン
0.7
以降では、
socket.join
メソッドを使って複数のソケットのグルー
プを部屋（
Room
）に分ける便利な機能を用意しています。接続中のソケットを
origin
の文字列
が名前に与えられた部屋に分けて、
io.socket.to(origin).emit
メソッドを使って、イベントを
emit
する際に同じ
sites
の部屋に入ったソケットにのみイベントを送信するよう、
socket.io
で
設定します。
io.sockets
の
connection
イベントと
socket
の
disconnect
イベントそれぞれの発生時に
total
カスタムイベントを発生させて、それぞれのサイトの訪問者のソケットにトータル接続数を伝えま
す。
widget_client.js
は
div
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.