Multi-select

The multi-select field shows a set of options and stores the chosen option IDs as a string array.

Options and validation

options, allowOther, and shuffleOptions behave like the select field. Fillo rejects unknown IDs, duplicate values, and more than one free-text Other answer. A required field must contain at least one choice.

There's no minimum- or maximum-selection option in the current schema. If the form has to enforce something like "choose exactly three," use a custom field.

Add a multi-select field

In the dashboard, select Add block, choose Multi-select, and add the options in their default display order.

const topicsField = {
  id: "topics",
  kind: "multi_select",
  label: "What do you need help with?",
  options: [
    { id: "setup", label: "Setup" },
    { id: "billing", label: "Billing" },
    { id: "security", label: "Security" },
  ],
  allowOther: true,
} as const;

URL prefill uses a comma-separated list of option IDs, for example ?topics=setup,security. Invalid IDs are ignored.

Related

• Select: Store one visible choice.
• Custom: Enforce a minimum or maximum number of selections.
• Prefill and hidden fields: Seed choices from a query string or app state.