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Okay guys, I'm trying to integrate a facebook-like messaging system into my web application. I can't post the link unfortunately because it requires login.
I have the database with a conversation table, a messages table, and the html page which calls all the messages based on the given conversation id. I also have a text area and submit button for sending a new message and adding it to the database.
Now I've heard two different methods..
That I should have javascript check for updates every second or so to see new messages, and update with ajax. Would this put too much strain on a server?
or.
To use a frame work like node.js. This method makes very little sense to me as I really don't understand requests very well.
So stack overflow, which method (or neither) would be the best way to implement this?
Polling is resource-heavy. You should consider something like WebSockets.
With WebSockets, you basically will have the client chat user apps subscribe the to the WebSocket, and then the back end server application would notify them when they should check for updates, or just push the new message updates out to them right over the WebSocket connection.
Here is a demo chat application you can look at. Here's the WebSocket website.
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I'm building pretty simple appointment system with node js, js and sql.
im getting the data: name, hour, day -> store it in sql (sending sms to the client) and edit the day and hour in the sql so it will not show it on the website.
everything is working well.
now i want that when some user made appointment it will show to other users that this hour in this day is not available (right now it is happening but the other users should refresh the page to see the update).
i think socket io can help me here.
i read all the documentation and its all about chat rooms.. before i get my hands dirty with socket io and trying to modify it, i want to ask for help . do you think it is possible to do it? and if yes what is the best way for your opinion.
thanks in advance
Yes. You definitely can use WebSocket API (or any library built on top of it, e.g. Socket.io) to update a client's webpage without it having to refresh the page.
You could simply emit an event from your NodeJS application on receiving an an appointment request and handle the event's payload at the client's end to update the webpage.
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So I want to make a website which visualize in real time some simulations which take some time to compute and I would like to know the easiest way to do it.
For now, the javascript front-end get the final result in once from the flask api and show it to the user. I would like the backend to send the result of the simulation in real-time, with batch of data at time intervals while it still computes, and the frontend to display the results in real time without having to re-load the page each time. How could I do that easily ?
Thanks
There are two common methods for doing this:
Web Sockets
Server-Sent Events (SSE)
If the frontend of your application needs to speak to the backend very often, then it would be best to open up a web socket for this channel of communication. Here is a list of popular frameworks for commonly used languages, including Python: https://github.com/facundofarias/awesome-websockets
If the frontend of your application just needs to listen for updates, then it may be better to use open up an event stream with SSE. Note that this can be done nowadays in most browsers in plain JavaScript at the frontend, but the backend may be a little more involved. Since you're using Flask, you might want to take a look at Flask-SSE.
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I have been searching across the Web to find a solution to this:
Basically what I want to setup is a way to have an HTML page on a live production site to kept updated. This is because I have setup a SilverStripe Application as part of a graphics system (green chroma key) that runs through normal HTML.
AJAX load doesn't seem to be an option here since the load would be every 1 second or half a second to make sure the page is live.
I looked into web socket quite vaguely but the whole concept of integrating it with my project confused me entirely.
Anyone got any ideas of what could be done?
To do this you'll need a combination of:
AJAX, you'll need to never do a full page load after the initial Web 1.0 request.
Session history management, you'll need this in order to not break the browser navigation (e.g. back/forward buttons).
Web Sockets, you'll need this so when new content arrives on the server it is received by the client without first having to poll the server.
Web sockets will be the greatest challenge. I listed them in the order in which you should approach the project, in three phases.
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I tried creating a chat application in Php and i used the below logic.
1.Get input from user-1 and insert it into the table.
2.Run an ajax function every 5 seconds to look for new entries in the table and display to user-2.
3.vice-versa.
This procedure is really too very slow and the browser hangs often.
How does the real-time chat application actually works ? Can the database trigger an event automatically in the front-end so that we need not hit the database every 5 seconds? If yes, how it is done?
Thanks.
That strategy is called polling and it served us good in the early 2000s, but it has done its time.
A better enhancement is long-polling. We request a webpage, but the server doesn't immediately respond but waits until there's new information available. When the clients receives the new information, it immediately sends a new request and so forth.
Now in 2015, we have HTML5 Websockets and HTML5 SSE (Server Sent Events), that allows both the client and the server to send data whenever data (on either side) is available.
You might consider using node.js (javascript) or Ratchet (PHP) on your server.
Or just long polling, like facebook...
You can use Websockets, they are supported natively in modern browsers.
https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API
And use a PHP library to use them server side : http://socketo.me
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I am creating a PHP application, where I want one user make a database entry. It should be reflected to all the users whoever have this app open on their browser will get instant notification that some data has been updated on the database or with whatever data has been inserted.
Is there any way I can get real time notification of data inserted or updated? On all the opened browser without any delay.
We use AJAX for now. But it seems like our application is now working slow due to continues request. Any other way? Which is free.
Thank you!
Take a look at Pusher (https://pusher.com/). It does what you want to achieve and it works like a charm.
I don't know what do you use on your server side but even if it isn't Laravel, take a look at Jeffrey's Laracast about implementing real time notifications in Laravel (PHP). https://laracasts.com/lessons/pusher-awesomeness
Have a fun! When I did it, my app became extremely sexy. Real time notifications, DOM manipulations etc.
You can use web sockets. One existing library example for PHP is Ratchet.