Rezi Forms

When to use

Use this skill when:

• Building forms with multiple inputs
• Need field validation and error display
• Handling form submission with loading states

Source of truth

• packages/core/src/forms/useForm.ts — useForm() hook
• packages/core/src/widgets/types.ts — InputProps, FieldProps, CheckboxProps, SelectProps
• packages/core/src/widgets/ui.ts — ui.input(), ui.field(), ui.checkbox(), ui.select()
• packages/core/src/ui/recipes.ts — recipe.input(), recipe.button(), recipe.select() for design-system styling

Steps

1. Use the useForm() hook inside a defineWidget:

   import { defineWidget, ui, useForm } from "@rezi-ui/core";
   
   const MyForm = defineWidget<{ onSubmit: (v: Values) => void }>((props, ctx) => {
     const form = useForm(ctx, {
       initialValues: { name: "", email: "" },
       validate: (values) => {
         const errors: Record<string, string> = {};
         if (!values.name) errors.name = "Required";
         if (!values.email.includes("@")) errors.email = "Invalid email";
         return errors;
       },
       onSubmit: async (values) => props.onSubmit(values),
     });
   
     return ui.column({ gap: 1 }, [
       ui.field({
         label: "Name",
         error: form.errors.name,
         children: ui.input({ id: "field-name", ...form.bind("name") }),
       }),
       ui.field({
         label: "Email",
         error: form.errors.email,
         children: ui.input({ id: "field-email", ...form.bind("email") }),
       }),
       ui.actions([
         ui.button({ id: "cancel", label: "Cancel", intent: "secondary", onPress: () => {} }),
         ui.button({ id: "save", label: "Save", intent: "primary", onPress: form.handleSubmit }),
       ]),
     ]);
   }, { name: "MyForm" });

2. Bind fields using form.bind("fieldName") — returns object-form input props (value, onInput, onBlur, disabled)

3. Use ui.field() to wrap inputs with labels and error display

4. Access form state via form.errors, form.touched, form.dirty, form.submitting

5. Use success/warning for non-submit side actions:

   ui.button({ id: "approve", label: "Approve", intent: "success", onPress: handleApprove });
   ui.button({ id: "review", label: "Needs Review", intent: "warning", onPress: handleReview });

Design system note

Inputs are recipe-styled by default when semantic color tokens are available (for example via a ThemeDefinition preset). Manual overrides merge on top via the same mergeTextStyle(baseStyle, ownStyle) pattern used by the renderer. Use manual style only for targeted overrides (merged on top of recipe output). For button visuals, use intent (primary, secondary, danger, success, warning, link) in app code. Do not use dsVariant/dsTone in app-level form code.

Verification

• Validation errors display next to fields
• Submission works and calls onSubmit
• Touched/dirty state tracked correctly