What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Could you please explain in more detail how is the price will be calculated?
In your example, when you say: "a user inputs birthday" you mean they type the word birthday or is it something more like choosing the option "birthday" from a dropdown maybe.
You can use conditional logic to calculate prices based on a selection or multiple selections and we also have a lot of widgets that you can use.
I suggest that you create an account first (for FREE) and check the options that we have available.
If you have any more questions or hit a bump, just let us know and we'll happy to help.
I mean each member registering in a family must provide a name and birth date. For instance, the birthdate entered is 11/1/14. If that person will be under 3 years of age by 1/1/2015, then their membership is free. So essentially the logic would be if birthdate < 1/1/2012 then price = $0, else price = $50.
I will get on there and test the limits of the conditional logic.
You can use this guide as your reference for creating the conditional logic: https://www.jotform.com/help/268-How-to-Insert-Text-or-Mathematical-Caculation-into-a-field-using-a-Condition.
So, for example, you can have it like this:
By using Before and After ruling and/or Equals and Not Equals to date.
Let us know if you need any further assistance implementing this to your form.