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https://github.com/airjp73/remix-validated-form

Form component and utils for easy form validation in remix
https://github.com/airjp73/remix-validated-form

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Form component and utils for easy form validation in remix

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README 

        
# Remix Validated Form



A form library built for [Remix](https://remix.run) to make validation easy.



## Features



- Client-side, field-by-field and form-level validation

- Re-use validation on the server

- Set default values for the entire form in one place

- Supports nested objects and arrays

- Easily detect if a specific form is being submitted

- Validation library agnostic

- Can work without JS



## Docs



The docs are located a [remix-validated-form.io](https://www.remix-validated-form.io).



## Demo



https://user-images.githubusercontent.com/2811287/145734901-700a5085-a10b-4d89-88e1-5de9142b1e85.mov



To run `sample-app`:



```bash

git clone https://github.com/airjp73/remix-validated-form

cd ./remix-validated-form

yarn install

yarn build

yarn sample-app

```



## Getting started



### Install



#### Base package



```bash

npm install remix-validated-form

```



#### Validation library adapter



There are official adapters available for `zod` and `yup`.

If you're using a different library, see the [Validation library support](#validation-library-support) section below.



- @rvf/zod

- @rvf/yup



```bash

npm install @rvf/zod

```



If you're using zod, you might also find `zod-form-data` helpful.



### Create an input component



In order to display field errors or do field-by-field validation, it's recommended to incorporate this library into an input component using `useField`.



```tsx

import { useField } from "@rvf/remix";



type MyInputProps = {

  name: string;

  label: string;

};



export const MyInput = ({ name, label }: MyInputProps) => {

  const { error, getInputProps } = useField(name);

  return (

    


      {label}

      

      {error && {error}}

    


  );

};

```



### Create a submit button component



To best take advantage of the per-form submission detection, we can create a submit button component.



```tsx

import { useFormContext, useIsSubmitting } from "@rvf/remix";



export const MySubmitButton = () => {

  const isSubmitting = useIsSubmitting();

  const { isValid } = useFormContext();

  const disabled = isSubmitting || !isValid;



  return (

    

      {isSubmitting ? "Submitting..." : "Submit"}

    

  );

};

```



### Using the form



Now that we have our components, making a form is easy.



```tsx

import { DataFunctionArgs, json, redirect } from "@remix-run/node";

import { useLoaderData } from "@remix-run/react";

import * as yup from "yup";

import { validationError, ValidatedForm, withYup } from "@rvf/remix";

import { MyInput, MySubmitButton } from "~/components/Input";



// Using yup in this example, but you can use anything

const validator = withYup(

  yup.object({

    firstName: yup.string().label("First Name").required(),

    lastName: yup.string().label("Last Name").required(),

    email: yup.string().email().label("Email").required(),

  }),

);



export const action = async ({ request }: DataFunctionArgs) => {

  const fieldValues = await validator.validate(await request.formData());

  if (fieldValues.error) return validationError(fieldValues.error);

  const { firstName, lastName, email } = fieldValues.data;



  // Do something with correctly typed values;



  return redirect("/");

};



export const loader = async (args: DataFunctionArgs) => {

  return json({

    defaultValues: {

      firstName: "Jane",

      lastName: "Doe",

      email: "[email protected]",

    },

  });

};



export default function MyForm() {

  const { defaultValues } = useLoaderData();

  return (

    

      

      

      

      

    

  );

}

```



### Nested objects and arrays



You can use nested objects and arrays by using a period (`.`) or brackets (`[]`) for the field names.



```tsx

export default function MyForm() {

  const { defaultValues } = useLoaderData();

  return (

    

      

      

      

      

      

      

      

      

      

    

  );

}

```



## Validation Library Support



There are official adapters available for `zod` and `yup` , but you can easily support whatever library you want by creating your own adapter.



And if you create an adapter for a library, feel free to make a PR on this repository 😊



### Creating an adapter



Any object that conforms to the `Validator` type can be passed into the the `ValidatedForm`'s `validator` prop.



```ts

type FieldErrors = Record;



type ValidationResult =

  | { data: DataType; error: undefined }

  | { error: FieldErrors; data: undefined };



type ValidateFieldResult = { error?: string };



type Validator = {

  validate: (unvalidatedData: unknown) => ValidationResult;

  validateField: (

    unvalidatedData: unknown,

    field: string,

  ) => ValidateFieldResult;

};

```



In order to make an adapter for your validation library of choice, you can create a function that accepts a schema from the validation library and turns it into a validator.



Note the use of `createValidator`.

It takes care of unflattening the data for nested objects and arrays since the form doesn't know anything about object and arrays and this should be handled by the adapter.

For more on this you can check the implementations for `withZod` and `withYup`.



The out-of-the-box support for `yup` in this library works as the following:



```ts

export const withYup = (

  validationSchema: Schema,

  // For best result with Typescript, we should type the `Validator` we return based on the provided schema

): Validator> =>

  createValidator({

    validate: (unvalidatedData) => {

      // Validate with yup and return the validated & typed data or the error



      if (isValid) return { data: { field1: "someValue" }, error: undefined };

      else return { error: { field1: "Some error!" }, data: undefined };

    },

    validateField: (unvalidatedData, field) => {

      // Validate the specific field with yup



      if (isValid) return { error: undefined };

      else return { error: "Some error" };

    },

  });

```



## Frequenty Asked Questions



### Why are my fields triggering the native HTML validations before `remix-validated-form` ones?



This is happening because you or the library you are using is passing the `required` attribute to the fields.

This library doesn't take care of eliminating them and it's up to the user how they want to manage the validation errors.

If you wan't to disable all native HTML validations you can add `noValidate` to ``.

We recommend this approach since the validation will still work even if JS is disabled.



### How do we trigger toast messages on success?



Problem: how do we trigger a toast message on success if the action redirects away from the form route? The Remix solution is to flash a message in the session and pick this up in a loader function, probably in root.tsx

See the [Remix](https://remix.run/docs/en/v1/utils/sessions#sessionflashkey-value) documentation for more information.



### Why is my cancel button triggering form submission?



Problem: the cancel button has an onClick handler to navigate away from the form route but instead it is submitting the form.

A button defaults to `type="submit"` in a form which will submit the form by default. If you want to prevent this you can add `type="reset"` or `type="button"` to the cancel button.