How to send different parameters to server side on different callbacks.

Hi, Guys

I have a few drop down lists on the page and a display button, when click the button, the dropdown list values would be sent back to server side and get data back to display via datatables API.

the first time the data is displayed correctly. then I change the dropdown list settings and try to get a new data back. the datatables just show the same data.

I found from the website that i need fnReloadAjax to reload new parameters from client side, howerver I do not know how to do it.

Could someone throw an example.

thanks