Pre-fill data in a form

This will only work with custom fields in your form (not core fields or action-only fields)

Note: if your field name has spaces in it, then you need to use %20 in the URL for each space.

A current example of this is the volunteer form for Upgrade Democracy and here is a URL that allows for the first question to be auto-filled.

The custom field is ASUD_PrefRole and the url mechanism is

source=ASUD_PrefRole=Steward

Here is the full URL (with an extra source parameter showing the person is signing up from the Rebel Toolkit):

https://actionnetwork.org/forms/upgrade-democracy-crew-signup?source=RTUDCrew&ASUD_PrefRole=Steward&

You can see this and various other pre-selected choices on the Upgrade Democracy volunteering page