user has loged in

[Arleston Lueders]

Hi Folks,

I would like to know how can I restrict access for just one user in my application. If another user log in with the same ID, it blocks or shows a message "Just alowed 1 login per user".

How can I know when this user has loged off? I would like to implement this in my app, but not sure where to start.

Thanks guys.

[Chris G]

There may be a better way, but my first thought is to track the logged in userId in the application scope. When a new user logs in, validate their credentials and make sure that ID doesn't already exist in the application scope.

[Risto]

Just set a flag called loggedin or something in the db. When the user logs in check by doing where user "whatever" and loggedin eq false. If someone is already logged in with that user
display your message.

When the user clicks logout just set the loggedin flag back to false and log them out. Obviously you could make this as sophisticated as you want, but that's the basics.

I'm also writing this not having any idea how you authenticate, or even if your using a database.

[Chris G]

that would work, assuming the user is responsible enough to logout explicitly. That may or may not be realistic.

even with the application variable approach, you'd have to worry about user's simply walking away from their machine, so with either approach, you'd have to develop a mechanism that times out.

You'd want something you could refresh whenever there is activity. I'd hate to track that with a DB call everytime. I'd still go with the application variable because everytime that user loads a new page, you could refresh the variable. If the user walks away, that variable will disappear automatically once the timeout has been reached (right?)

[Per Djurner]

Sounds like onSessionEnd would be useful here.

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