Thanks Alikutty and Najoshi for you reply

@ Alikutty - I have the values stored at server side. I have also written an script include to filter the dropdown. But it is filtering only at the loading time. But I need to refresh the 2nd dropdown every time when I change my first dropdown. This is not happening. How to achive the functionality when I change the value in my first dropdown.

Regards,

Vikash