How to Detect when sever communication is down?

General
1

I wnat to lock the current ui of server communication is down. It will be unlocked when server comunication is established again. But i wasnt able to find a way to detect the server status when comunication is down (eg when network cable is unpluged). is there a way to do that. any help would be appriciated…

2

The standard Vaadin mechanisms like Hearbeat are mainly made so that the server side notices when the client is gone (eg by closing the browser).
I don’t know of any built-in way to do this for the client but you could do this using Javascript. (see
http://stackoverflow.com/questions/5224197/javascript-check-if-server-is-online
). You could add your javascript by either making a Javascript extension maybe to the UI class or by creating and integrating a small simle Javascript Component.
Take a look at the Javascript section here:
https://vaadin.com/wiki/-/wiki/Main/Vaadin+7

3

hi Marius,

Thanks for the quick reply. I’ll try that out and see.