I have made an application in EXTJS using PHP. when i leave my application for sometime stale in no activity mode/ sever sessions are gone, and any of the store can not fetch any data from any webservice. it returns null and thus the UI do not get filled by data at all.
at this point i want user to be redirected to login page and login again and to show him such an alert stating the same.
please let me know how can i do that using extjs.