There are gems like Faye that allow an action taken by one user to send a real-time push notification to another user, similar to facebook notifications.
Does anyone know of a way to accomplish this using only jquery and ajax?
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Ajax is using http, once http completed it's task, it will disconnect from server. Unless you set interval and keep pooling from server, else you can't push from server. Another way to do this is using web socket or server sent event (SSE)Joey Chong– Joey Chong2015-07-07 06:01:20 +00:00Commented Jul 7, 2015 at 6:01
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FYI, you can read Push : SSE vs WebSocketsJoey Chong– Joey Chong2015-07-07 06:03:32 +00:00Commented Jul 7, 2015 at 6:03
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2 Answers
Following on Joey Chong's answer, you can use SSE (Servent-Sent Events) to push messages to a user (Faye is based on websocket, that may be a problem with some proxies and firewalls, and it looks like you don't really need a bidirectional connection).
For more information on websockets and SSE : here and here.
If you don't want to build your SSE server or just want to test some client-side code, StreamData will allow you to turn any JSON API into SSE pushes (disclaimer: I represent this firm). It's free up to one million messages, so you can try and leave it if SSE is not what you are looking for.
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halfer
FYI, on your website I get this for the Bitcoin example: "Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at proxy.streamdata.io/https://api.bitcoinaverage.com...". I get the same for the first example too now, though that worked a while ago! FF/Ubuntu LTS/NoScript.
Nicolas Babel
Thx very much for the feed-back) (and for the edit, I will remember to put the disclaimer each time). About the error message, proxy.streamdata.io is a demo proxy on which we don't guarantee SLA as no identification is required. Last week, a lot of requests were made and we reach our maximum number of connections allowed. We have risen the limits. It should work fine now on the demo proxy. You can also test it via creating a user and then we guarantee a much higher limit even in freemium.
No, there's no way to do that directly. But, there are some push notification APIs like Chrome Push Notification API and PushBullet which are useful if you want to send push notifications from your web application.