shadcn/ui Integration

next-server-actions works seamlessly with shadcn/ui components. This guide shows how to integrate your server actions with reusable form components using shadcn/ui.

---

Getting Started

Installation

To use Slot in custom form components, install the @radix-ui/react-slot package:

npm

npm install @radix-ui/react-slot

Yarn

yarn add @radix-ui/react-slot

pnpm

pnpm install @radix-ui/react-slot

You’ll also need the Label component from shadcn/ui. Install it using:

npm

npx shadcn@latest add label

Yarn

npx shadcn@latest add label

pnpm

pnpm dlx shadcn@latest add label

---

Create Shared Form Components

Create a file called form-fields.tsx in your app/components directory. This file defines reusable components for form layout, validation messages, and accessibility attributes.

Copy the following code into form-fields.tsx:

"use client";

import { ComponentProps, createContext, useContext, useId } from "react";
import { cn } from "@/lib/utils";
import { Label } from "@/components/ui/label";
import { Slot } from "@radix-ui/react-slot";

type Context = { id: string; name: string; errors: string[] };
const FormFieldContext = createContext<Context>({} as Context);

interface FormFieldProps<S extends object> extends ComponentProps<"div"> {
  name: keyof S;
  errors?: { [K in keyof S]?: string[] };
}

export function FormField<S extends object>({
  className,
  name,
  errors,
  ...props
}: FormFieldProps<S>) {
  const id = useId();
  const fieldErrors = errors ? errors[name] ?? [] : [];

  return (
    <FormFieldContext.Provider value={{ id, name: name as string, errors: fieldErrors }}>
      <div className={cn("space-y-2", className)} {...props} />
    </FormFieldContext.Provider>
  );
}

export function FormControl(props: ComponentProps<typeof Slot>) {
  const { id, errors } = useContext(FormFieldContext);
  const hasError = errors.length > 0;

  const messages = errors.map((_, index) => `form-message-${id}-${index}`);

  return (
    <Slot
      id={id}
      aria-invalid={hasError}
      aria-describedby={`form-description-${id} ${messages.join(" ")}`}
      {...props}
    />
  );
}

export function FormLabel({
  className,
  ...props
}: ComponentProps<typeof Label>) {
  const { id, errors } = useContext(FormFieldContext);

  return (
    <Label
      htmlFor={id}
      className={cn(className, errors.length > 0 && "text-destructive")}
      {...props}
    />
  );
}

export function FormMessage() {
  const { id, errors } = useContext(FormFieldContext);

  return errors.map((error, index) => (
    <p
      key={error}
      id={`form-message-${id}-${index}`}
      className="text-[0.8rem] font-medium text-destructive"
    >
      {error}
    </p>
  ));
}

export function FormDescription({ className, ...props }: ComponentProps<"p">) {
  const { id } = useContext(FormFieldContext);

  return (
    <p
      id={`form-description-${id}`}
      className={cn("text-[0.8rem] text-muted-foreground", className)}
      {...props}
    />
  );
}

---

Example Usage

Define a validation schema and form types:

import { z } from "zod";

export const schema = z.object({
  email: z.string().email(),
  password: z.string().min(8),
});

export type FormData = z.infer<typeof schema>;

Now use the shared components to build a clean form:

"use client";

import Form from "next/form";
import { useActionState } from "react";
// the server action from previous example
import { signIn } from "@lib/actions/sign-in";
// import the components
import {
  FormField,
  FormControl,
  FormLabel,
  FormMessage,
} from "@/components/form-fields";
import { Input } from "@/components/ui/input";
import { Button } from "@/components/ui/button";
// import the schema
import { FormData } from "@/lib/definitions";

export function SignInForm() {
  const [state, action, pending] = useActionState(signIn, { ok: false });

  return (
    <Form action={action} className="grid gap-4 mx-auto max-w-2xl py-12">
      <FormField<FormData> name="email" errors={state.errors}>
        <FormLabel>Email</FormLabel>
        <FormControl>
          <Input name="email" type="email" />
        </FormControl>
        <FormMessage />
      </FormField>

      <FormField<FormData> name="password" errors={state.errors}>
        <FormLabel>Password</FormLabel>
        <FormControl>
          <Input name="password" type="password" />
        </FormControl>
        <FormMessage />
      </FormField>

      <hr />

      <Button disabled={pending}>
        {pending ? "Submitting..." : "Submit"}
      </Button>
    </Form>
  );
}

---

Usage with Select

You can also use FormField with the Select component from shadcn/ui.

"use client";

import {
  FormField,
  FormControl,
  FormLabel,
  FormMessage,
} from "@/components/form-fields";
import {
  Select,
  SelectContent,
  SelectGroup,
  SelectItem,
  SelectLabel,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";

<FormField<FormData> name="fruit" errors={state.errors}>
  <FormLabel>Fruit</FormLabel>
  <FormControl>
    <Select name="fruit">
      <SelectTrigger>
        <SelectValue placeholder="Select a fruit" />
      </SelectTrigger>
      <SelectContent>
        <SelectGroup>
          <SelectLabel>Fruits</SelectLabel>
          <SelectItem value="apple">Apple</SelectItem>
          <SelectItem value="banana">Banana</SelectItem>
          <SelectItem value="blueberry">Blueberry</SelectItem>
          <SelectItem value="grapes">Grapes</SelectItem>
          <SelectItem value="pineapple">Pineapple</SelectItem>
        </SelectGroup>
      </SelectContent>
    </Select>
  </FormControl>
  <FormMessage />
</FormField>

warning

Always pass the name prop to inputs like Input, Textarea, or Select. This is required for the form data to be submitted properly.