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Question

Let’s consider a schema written in zod.

import { z } from "zod";

const schema = z.object({
  name: z.string().min(2, {
    message: "Enter a valid name",
  }),
  website: z.string().min(2, {
    message: "Enter a valid website",
  }).optional(),
  phone: z.string().min(10, {
    message: "Enter a valid phone number",
  }),
});

I know that name and phone are required fields and website is a optional field.

import {
  Form,
  FormControl,
  FormLabel,
  FormDescription,
  FormField,
  FormItem,
  FormMessage,
} from "@/components/ui/form";
import { z } from "zod";
import { zodResolver } from "@hookform/resolvers/zod";

export default function FormPage() {
  const form = useForm<z.infer<typeof schema>>({
    resolver: zodResolver(formSchema),
  });

  return (
    <Form {...form}>
      <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-8">
            <FormField
              control={form.control}
              name="name"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Name</FormLabel>
                  <FormControl>
                    <Input {...field} />
                  </FormControl>
                  <FormDescription>Enter your name.</FormDescription>
                  <FormMessage />
                </FormItem>
              )}
            />
            <FormField
              control={form2.control}
              name="website"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Website</FormLabel>
                  <FormControl>
                    <Input {...field} />
                  </FormControl>
                  <FormDescription>Enter your website.</FormDescription>
                  <FormMessage />
                </FormItem>
              )}
            />
            <FormField
              control={form.control}
              name="phone"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Phone Number</FormLabel>
                  <FormControl>
                    <Input {...field} />
                  </FormControl>
                  <FormDescription>Enter your phone number.</FormDescription>
                  <FormMessage />
                </FormItem>
              )}
            />
        <Button type="submit" className="w-full mt-6">
          Submit
        </Button>
      </form>
    </Form>
  );
}

The issue at hand is, in the UI part I don’t see any asterisk (*) to show it required as important.

Only when I click on submit it shows as required, because it was not filled

What can I do that via schema the required information is properly inferred and it shows the mark ?

I tried modifying the form.tsx of shadcn to get the mark but it would require me to explicitly mention it is a required field

const FormLabel = React.forwardRef<
  React.ElementRef<typeof LabelPrimitive.Root>,
  React.ComponentPropsWithoutRef<typeof LabelPrimitive.Root> & {
    required?: boolean;
  }
>(({ className, required, ...props }, ref) => {
  const { error, formItemId } = useFormField();

  return (
    <Label
      ref={ref}
      className={cn(
        error && "text-destructive",
        required && 'after:ml-0.5 after:text-destructive after:content-["*"]',
        className
      )}
      htmlFor={formItemId}
      {...props}
    />
  );
});
FormLabel.displayName = "FormLabel";

The modified code part

 <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-8">
            <FormField
              control={form.control}
              name="name"
              render={({ field }) => (
                <FormItem>
                  <FormLabel required>Name</FormLabel> {/* Added required here  */}
                  <FormControl>
                    <Input {...field} />
                  </FormControl>
                  <FormDescription>Enter your name.</FormDescription>
                  <FormMessage />
                </FormItem>
              )}
            />
            <FormField
              control={form2.control}
              name="website"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Website</FormLabel>
                  <FormControl>
                    <Input {...field} />
                  </FormControl>
                  <FormDescription>Enter your website.</FormDescription>
                  <FormMessage />
                </FormItem>
              )}
            />
            <FormField
              control={form.control}
              name="phone"
              render={({ field }) => (
                <FormItem>
                  <FormLabel required>Phone Number</FormLabel> {/* Added required here  */}
                  <FormControl>
                    <Input {...field} />
                  </FormControl>
                  <FormDescription>Enter your phone number.</FormDescription>
                  <FormMessage />
                </FormItem>
              )}
            />
        <Button type="submit" className="w-full mt-6">
          Submit
        </Button>
      </form>

I was trying to find a way where I don’t have to pass required in the FormLabel and it will detect automatically which is a required field by Zod and Mark it as required via asterisk.

Complete form.tsx take from shadcn/ui forms

import * as React from "react";
import * as LabelPrimitive from "@radix-ui/react-label";
import { Slot } from "@radix-ui/react-slot";
import {
  Controller,
  ControllerProps,
  FieldPath,
  FieldValues,
  FormProvider,
  useFormContext,
} from "react-hook-form";

import { cn } from "@/lib/utils";
import { Label } from "@/components/ui/label";

const Form = FormProvider;

type FormFieldContextValue<
  TFieldValues extends FieldValues = FieldValues,
  TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>
> = {
  name: TName;
};

const FormFieldContext = React.createContext<FormFieldContextValue>(
  {} as FormFieldContextValue
);

const FormField = <
  TFieldValues extends FieldValues = FieldValues,
  TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>
>({
  ...props
}: ControllerProps<TFieldValues, TName>) => {
  return (
    <FormFieldContext.Provider value={{ name: props.name }}>
      <Controller {...props} />
    </FormFieldContext.Provider>
  );
};

const useFormField = () => {
  const fieldContext = React.useContext(FormFieldContext);
  const itemContext = React.useContext(FormItemContext);
  const { getFieldState, formState } = useFormContext();

  const fieldState = getFieldState(fieldContext.name, formState);

  if (!fieldContext) {
    throw new Error("useFormField should be used within <FormField>");
  }

  const { id } = itemContext;

  return {
    id,
    name: fieldContext.name,
    formItemId: `${id}-form-item`,
    formDescriptionId: `${id}-form-item-description`,
    formMessageId: `${id}-form-item-message`,
    ...fieldState,
  };
};

type FormItemContextValue = {
  id: string;
};

const FormItemContext = React.createContext<FormItemContextValue>(
  {} as FormItemContextValue
);

const FormItem = React.forwardRef<
  HTMLDivElement,
  React.HTMLAttributes<HTMLDivElement>
>(({ className, ...props }, ref) => {
  const id = React.useId();

  return (
    <FormItemContext.Provider value={{ id }}>
      <div ref={ref} className={cn("space-y-2", className)} {...props} />
    </FormItemContext.Provider>
  );
});
FormItem.displayName = "FormItem";

const FormLabel = React.forwardRef<
  React.ElementRef<typeof LabelPrimitive.Root>,
  React.ComponentPropsWithoutRef<typeof LabelPrimitive.Root> & {
    required?: boolean;
  }
>(({ className, required, ...props }, ref) => {
  const { error, formItemId } = useFormField();

  return (
    <Label
      ref={ref}
      className={cn(
        error && "text-destructive",
        required && 'after:ml-0.5 after:text-destructive after:content-["*"]',
        className
      )}
      htmlFor={formItemId}
      {...props}
    />
  );
});
FormLabel.displayName = "FormLabel";

const FormControl = React.forwardRef<
  React.ElementRef<typeof Slot>,
  React.ComponentPropsWithoutRef<typeof Slot>
>(({ ...props }, ref) => {
  const { error, formItemId, formDescriptionId, formMessageId } =
    useFormField();

  return (
    <Slot
      ref={ref}
      id={formItemId}
      aria-describedby={
        !error
          ? `${formDescriptionId}`
          : `${formDescriptionId} ${formMessageId}`
      }
      aria-invalid={!!error}
      {...props}
    />
  );
});
FormControl.displayName = "FormControl";

const FormDescription = React.forwardRef<
  HTMLParagraphElement,
  React.HTMLAttributes<HTMLParagraphElement>
>(({ className, ...props }, ref) => {
  const { formDescriptionId } = useFormField();

  return (
    <p
      ref={ref}
      id={formDescriptionId}
      className={cn("text-sm text-muted-foreground", className)}
      {...props}
    />
  );
});
FormDescription.displayName = "FormDescription";

const FormMessage = React.forwardRef<
  HTMLParagraphElement,
  React.HTMLAttributes<HTMLParagraphElement>
>(({ className, children, ...props }, ref) => {
  const { error, formMessageId } = useFormField();
  const body = error ? String(error?.message) : children;

  if (!body) {
    return null;
  }

  return (
    <p
      ref={ref}
      id={formMessageId}
      className={cn("text-sm font-medium text-destructive", className)}
      {...props}
    >
      {body}
    </p>
  );
});
FormMessage.displayName = "FormMessage";

export {
  useFormField,
  Form,
  FormItem,
  FormLabel,
  FormControl,
  FormDescription,
  FormMessage,
  FormField,
};

Thiết kế website giá rẻ

Danh mục

How can I automatically check for a required field in the form, and a asterisk (*) in FormLabel in shadcn/ui, zod