Field IDs let you reference answers from one field inside another. You can use them to dynamically populate labels, build selection lists, or even pre-fill default values. This guide explains the different ways to use Field IDs to make your forms more dynamic and intelligent.
Instructions
Referencing a Field in a Label
- Create or locate the source field you want to reference (e.g. Child’s date of birth).
- Copy the Field ID (e.g. [@123456789]).
- In the label of another field, paste the Field ID where you want the value to appear.
EXAMPLE:
Instead of writing: "Child’s date of birth"
You could write: "[@123456789]’s date of birth"
Using Field IDs in a Selection List
- Create fields that gather the options you want to list (e.g. Applicant Name and Respondent Name).
- Add a new field using Radio, Checkbox, or Select.
- In the options list, insert the relevant Field IDs instead of text.
EXAMPLE:
Options list:
- [@987654321]
- [@123456789]
The form will display the answers from those fields as the selectable options.
Referencing a Field in a Default Value
- Add a new field where you want to insert a previously collected answer.
- In the Default Value section of the field settings, type the Field ID (e.g. [@123456789]).
- Save the field.
NOTE: This works well for summarising answers or pre-filling repeated data.
Tips for Use
- Make sure the field you’re referencing appears above the field that uses the reference.
- Use Field IDs in dynamic labels to personalise the form experience.
- Use Field IDs in selection lists to streamline options based on previous answers.
Common Issues & Solutions
- Issue: The Field ID doesn’t resolve—it just shows as text.
- Solution: Check that the Field ID is typed correctly and references a field above it in the form.
- Issue: I don’t know where to find the Field ID.
- Solution: In the Form Builder, click on a field and look for the Field ID in the settings panel or section view.