Conditional fields let a field show up only when it’s relevant. You set a rule once, and Air Fill checks it as people fill out the form. This is a Pro feature; on the free plan you’ll see Conditional fields as a locked row in the field’s settings.
Set a condition on a field
- In the form editor’s Build view, tap the field you want to control to open its settings.
- Find the Visibility section and open the Show this field picker. You’ll see Always, With conditions, Only when empty, and Never.
- Choose With conditions. A Conditions row appears.
- Tap Conditions to open the Conditions editor.
Build the rule
At the top of the editor is a Show when header with a control to match All or Any of these conditions. Use All when every condition has to be true, and Any when one is enough.
Tap Condition to add a rule. Each condition has three parts:
- A Field to check — this can be any other field in your form.
- A condition (the operator).
- A Value to check against. Instead of a fixed value, you can tap Compare to another field…, or use Today for date fields.
The operators you can pick depend on the type of field you’re checking. A text field offers things like equals, contains, and is empty. A number field offers is greater than or is between. A date field offers is today or is before today. A checkbox offers is checked or is unchecked.
For more involved logic, tap Group to nest conditions inside a group. You can nest several levels, which lets you mix All and Any rules together.
What happens on the form
The field shows up only when its conditions are met. When a field is hidden by its conditions, its value isn’t included when the form is submitted.
The other Show this field options
- Always keeps the field visible every time.
- Only when empty shows the field until it already has a value — handy for a prefilled field. The value is still submitted.
- Never hides the field on the form.
Good to know
Conditions decide whether a field appears; they don’t make it required. If you need an answer, turn on the field’s separate Required toggle.
The same idea applies to sections and the submit button: a section has a Show when option, and the submit button has an Allow submit when option, both built the same way.