In an iframe, how to append a field alias to the relative Zoho Form URL in the default "Add another response" button

In an iframe, how to append a field alias to the relative Zoho Form URL in the default "Add another response" button

Using javascript I can initially load the ZOHO form on my site in an iframe by populating a field alias and appending to the ZOHO form URL.
On the "Thank You" page that appears in the iframe after a successful submit, and in the default button "Add another response", would also like the relative url to be appended with the same field alias.
I have been unable to achieve this requirement. 
Does anyone have any ideas/suggestions?  Thank you in advance!