Creating a drop-down list in XLSForm

[danbjoseph]

To make it easier for collectors to find the right option in a large list you might try:

• cascading select
• select widget with autocomplete
• dynamic selects from pre-loaded data
• or check out these posts on using search in the appearance column 1 and 2

You can collect signatures with the signature widget. There is not a current implementation for taking a fingerprint scan. If you search for fingerprint, there are several posts in the forum about how someone might implement a fingerprint scanner, such as this one:

Feeding fingerprint data from reader to ODK Collect?

What you should be able to do is to develop a small custom app that uses the print reader's SDK to read a fingerprint and convert that print to a unique identifier according to your project's need. The actual print reading should be guarded securely for the privacy of your users. You can then call this custom app from Collect and return the unique identifier to Collect once the print has been identified. Documentation on using external apps can be found here and there's an example project here. …

If you need a system in which a requirement is pulling up previously submitted records you might want to explore the use of ODK-X tools (currently called ODK 2).