How can you call a controller method from JavaScript in salesforce?

Hi Saurabh,

You need to use apex:actionFunction within vf page and define "action" attribute to Function to call. For e.g

<apex:actionFunction action="{!login}" name="login"/>

here action="{!login}" is my function name to call and within javascript call name attribute within actionfunction according to your condition.

hope this will help you.