display coupon when user likes me on Facebook

I would like to reveal the hidden coupon textbox field when the user likes the page.

How to make this?

You can achieve this by adding a condition to our widget Facebook like me first. 

Here is the condition that I've added to the demo form.

Please check the demo form below to see how it works.

http://form.jotformpro.com/form/43455439699977? 

Hope this information helps. Let us know if you need any further assistance. We will be glad to help.

Thanks!

The issue now is when I like and unlike the page.

The hidden field no longer can hide.

Any solution?