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I have a small internal web system designed in `ASP.NET MVC 5. Max 50 users.
I am trying to implement something along the lines of this:
The idea is to display who is currently online (logged in on the website) to all the other users.
How would I go about implementing this in .net.
I have two issues:
Knowing / Managing the users login status
The transport mechanism / technology
For issue 1, I have looked into the SessionData property in .net i'm just not 100% sure on which mechanism within the MVC framework to use.
Could I use some sort of session linked variable?
For issue 2, do I need to have a JavaScript Function fire off every 30 seconds to say, "hey i'm still here" and then store that in memory or db and query it every 30 seconds.
Yes, it's very easy by using SignalR:
ASP.NET SignalR is a new library for ASP.NET developers that makes
developing real-time web functionality easy. SignalR allows
bi-directional communication between server and client. Servers can
now push content to connected clients instantly as it becomes
available. SignalR supports Web Sockets, and falls back to other
compatible techniques for older browsers. SignalR includes APIs for
connection management (for instance, connect and disconnect events),
grouping connections, and authorization.
I did it myself, you can look at my site SignalRTC to check how it works.
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I am pretty new to web dev, and I wanted to create a simple UI in Javascript with the Google Maps Places API to familiarize myself with everything. My question is, would I just make direct URL requests with the user’s variables, or would I have to create something server side, and if so, what would I have to do?
It depends on your application's functionality. Generally, you could keep all everything on the client-side. If you app is a server-rendered one, meaning you would be using a JavaScript framework like React or Vue, you could use just the website state to keep track of users' variables and send out requests to the Google APIs to do the heavy work.
You could also look into tools like Firebase, also created by the folks at Google to handle storage or user authentication. There are rich docs on how to include Firebase in your web application for your framework of choice. This way you can create language-agnostic backend resources that conform to all of the security measures and scales automatically so you can focus on the users' experience.
In case you would like to offer some less-common functionality or have complete control over the backend you could write up an API of your own and have it deployed on a separate backend server.
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I'm about to create a web application first but even though I manage the development with rails, graph and react. should I use python thinking more in the future of the application, if it grows in time? Or if you know about a technology stay first with it for development and then migrate?
Couple of option you can choose for web application
Use GRAND Stack : GraphQl +Reactjs + Apollo server+ Node js + Neo4j(instead of this use any other database which you are comfortable)
If web app event based : Then user Nodejs as server-side technology (MERN)
If web app as Data-computation/ Algorithms solution : then Go we React(Front end) +Nodejs(orchestration/ Middle layer) + Python(application layer/or back-end )+ any DB
Yes, i say every framework is good enough, in the long run every thing comes down to one question, how efficient code did u write?
Django
You can use django if you are interested in python. It is a famous framework which has its own ORM and many security built in features another option is flask
I will share my experience.
Recently, coded a website in laravel 5.5, at first everything was fine but when the number of user(s) grew to >50k. The site became slow and my servers showed 100% cpu usage. Later i changed the code, tried to remove nested loops, optimized my queries and used cache technologies like memchached. The site is working fine now.
i hope that answers your question.
I hope the best for you,
Happy Coding
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I would like to add a live chat support channel in my website, mainly focused on new users who have specific questions about my services and i´be been thinking about the best way to implement this solution myself. do note that i do not intend to use third party solutions.
What i´ve thought about retrieving messages: i can have a form on the page that will activate on user click (like a "start chat" button), once the button is clicked, i will GET all messages in the database related to the client's IP address (if it's not a logged in user) through a web service and load it into the DOM. after this, i will have a javascript function that will execute every XX seconds asking whether there are new messages.
to send messages: the user will have a textArea with a "send" button that will trigger a POST to a web service in order to save their message into the database, on the Support/web admin side, everything will work in a similar fashion but with the option of having several chats at the same time. Also i think I can achieve this by using JQUERY and ajax requests.
Is this a good idea to implement a live chat services? or am I far off from the ideal way of doing this? I have browsed around and all i get is suggestions to use third party service which i definitely do not want to use. Thanks!
You should have a look at websockets, especially at the socket.io library, which provides you an event based communication between the clients and the server.
They even have an example how to create a live chat:
http://socket.io/get-started/chat/
I you want a chat that is not just a "proof of concept", you should go for using XMPP, it's the most popular (and maybe the only-one) opensource instant-messaging protocol. There are several implementations in multiple languages and it has proven its robustness.
Wikipedia :
Extensible Messaging and Presence Protocol (XMPP) is a communications protocol for message-oriented middleware based on XML (Extensible Markup Language). It enables the near-real-time exchange of structured yet extensible data between any two or more network entities.
source
You could also take a look at IRC, which is quite old but still useful.
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I'm using Trigger.io to make an app I can deploy to both the app store and google play.
I'm researching baas backends that offer native sdk's for android and apple, but also offer javascript sdk's which I assume are meant for things like Trigger or Phonegap.
My question is do the app store guidelines favor one kind of back end service over another? Is javascript risky for backend? I just want to be sure before I pay for a service. The services I'm considering are cloudmine and shephertz.
They shouldn't know anything about your back-end web service.
Sounds like you are talking about making a hybird app though, which is also fine (and is technically a client). There are a ton of hybrid frameworks out there: Ionic, Cordova, Cocoon, PhoneGap, apparently Trigger.io, etc. They wouldn't be useful if app stores rejected them.
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I'm on developing a new application. It is going to work as follows,
=> All the user will be assigned to a group.
=> When a user logs in, the home page will show a textarea to add a message with all messages of the users who are in that group
=> Somtimes it is possible for one user will be assigned with more than one group, in that case the user have to select the groups they want to share their message.
=> The message sometimes have images and videos as well
In other words a chat room which is almost like the facebook newsfeed.
Now, my question, is there any plugins or script which is easy to be customised. Flash, Javascript.
Or what I can do is send ajax request every second to check the database for new message, grab and fetch on the screen. But the only thing I'm afraid is will it makes the server and/or the app slow or dead.
Please suggest me good solution dear genius brothers.
There are no such scripts to create an chatgroup that easy, you can use ajax to fetch the messages if you like.
But websockets or Server sent events would be a much better idea.
However using Server sent events (SSE) on apache is also not really a good idea as apache will create a proces for each open connection. If you would like to use SSE I suggest using nginx
Link to SSE.
https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events#Error_handling
Websockets.
https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API
Well learn:
jquery
nodejs
And then come back with other questions.
If you can learn, then learn the following:
Node.js
Angular.js
Socket.io
Express.js
They can make your life easier and this app can be possible in minutes. Look for a demo on the angular site.