Push System without node.JS

Question

I want to create a facebook-like notification system (the one who appears on the bottom-left side of the screen when someone comment on your post, for example).

The thing here is that the server needs to send you a notification when someone comments in the site in this exactly moment. I think this is called PUSH-System (sorry for my bad english).

I tried with node.JS but my dedicated server can't install it. Only if I buy a very expensive VPS plan.

So, is there a way using jQuery or something like that to make this Push notification system?

Thanks !!

, rodrigo.-

See these related SO questions: stackoverflow.com/questions/7594425/ajax-push-system and stackoverflow.com/questions/9138309/… — Jeremy Harris
– Jeremy Harris, Commented Mar 11, 2012 at 18:45

Community · Accepted Answer · 2017-05-23 11:52:41Z

2

If you want a low latency, efficient solution you should use WebSockets. However you need to have fallbacks in place such as long-polling / short polling available if the browser doesn't support WebSockets.

The WebSocket Protocol provides a full-duplex (two way) connection between the server and client. Traditional HTTP is half-duplex (one way). This link will give you an overview of the benefits of using WebSockets vs HTTP: http://www.websocket.org/quantum.html.

You need to be aware that most modern browsers support WebSockets, but use different protocols. See here: What browsers support HTML5 WebSocket API?.

edited May 23, 2017 at 11:52

CommunityBot

11 silver badge

answered May 7, 2012 at 23:41

Jack

15.9k20 gold badges71 silver badges93 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Jeremy Harris · Accepted Answer · 2012-03-11 18:52:37Z

1

In addition to the references I posted in the comments above, implementing a Long Polling technique is a common solution to eliminate large amounts of normal polling. Here is what Wikipedia says about it:

Long polling is a variation of the traditional polling technique and allows emulation of an information push from a server to a client. With long polling, the client requests information from the server in a similar way to a normal poll. However, if the server does not have any information available for the client, instead of sending an empty response, the server holds the request and waits for some information to be available. Once the information becomes available (or after a suitable timeout), a complete response is sent to the client. The client will normally then immediately re-request information from the server, so that the server will almost always have an available waiting request that it can use to deliver data in response to an event. In a web/AJAX context, long polling is also known as Comet programming.

answered Mar 11, 2012 at 18:52

Jeremy Harris

24.7k13 gold badges84 silver badges133 bronze badges

2 Comments

rec Over a year ago

Thanks i don't understud how Comet work but i will study it soon. Making a request with jQuery AJAX API in a setTimeOut function is bad, right?

Jeremy Harris Over a year ago

Using Javascript's setTimeout() isn't bad as it only runs once and times out. Using setInterval() on the other hand, will allow you to make AJAX calls repeatedly on a set time increment. This "polling" can bog down your server and application. That is where "long polling" comes in. You make a single request using Javascript/jQuery and the server holds that connection until it has data which, to a user of the application, appears as though the server just "pushed" the data to the application when really all it did was delay returning the data.

Collectives™ on Stack Overflow

Push System without node.JS

2 Answers 2

Comments

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related