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useForm is a custom hook designed to facilitate form state management and validation in Vue 3 applications. This documentation provides a comprehensive guide on how to integrate and utilize useForm effectively within your project.

Installation

To start using useForm, first, ensure you have the package installed in your Vue 3 project. You can install it via npm or yarn:

npm install @resourge/vue3-hook-form

or

yarn add @resourge/vue3-hook-form

Usage

Importing the Package

import { useForm } from '@resourge/vue3-hook-form';

Defining Form Data Model and Validation Schema

import { object, string } from '@resourge/schema';

// Define the shape of your form data
export class LoginUserFormModel {
  public username = '';
  public password = '';

  toModel() {
    return {
      username: this.username,
      password: this.password,
    };
  }
}

// Define a schema for form validation
const schema = object<LoginUserFormModel>({
  username: string().notNullable().required('Username is required'),
  password: string().notNullable().required('Password is required')
});

Creating a Form Instance

export const useLoginForm = () => {
  return useForm<LoginUserFormModel>(new LoginUserFormModel(), {
    validate: (form) => {
      return schema.validate(form);
    },
    validateDefault: true
  });
};

Using the Form Instance in Vue Component

<template>
  <form @submit.prevent="onSubmit">
    <FormControl :label="T.pages.login.form.username" :errors="getErrors('username')">
      <Input v-model="form.username" type="text" />
    </FormControl>
    <FormControl :label="T.pages.login.form.password" :errors="getErrors('password')">
      <Input v-model="form.password" type="password" />
    </FormControl>
    <div class="form-actions">
      <Button :label="T.pages.login.actions.enter" type="submit" variant="primary" />
    </div>
  </form>
</template>

<script>
import { useLoginForm } from '../modules/useForm.ts';

export default {
  setup() {
    const { form, handleSubmit, getErrors } = useLoginForm();

    const onSubmit = handleSubmit(async () => {
      // Your form submission logic here
    });

    return {
      form,
      onSubmit,
      getErrors
    };
  }
};
</script>

Properties and Methods

• changeValue(key, value): Updates the value of a specific field in the form.
• errors: An object containing validation errors for the form fields.
• field: Options and configurations for the form fields.
• form: Representation of the current state of the form data.
• getErrors(key): Get the validation errors for a specific field in the form.
• getIsDirtyField(key): Checks if a specific field in the form has been modified.
• getValue(key): Get the current value of a specific field in the form.
• handleSubmit(onSubmit): Handles form submission.
• hasError(key): Checks if a specific field in the form has validation errors.
• isDirty: Indicates whether the form has been modified.
• isValid: Indicates whether the form is currently in a valid state.
• onChange(key): Attaches an event listener to a specific form field.
• reset(newForm): Resets the form to a specified state.
• resetIsDirty: Resets the dirty state of the form.
• setError(error): Sets a validation error for the form or a specific field.
• watch(callback): Registers a callback function to watch for changes in the form’s state.

Support for Complex Forms

useForm supports complex forms such as wizards, multi-step, and nested state. Here’s an example of defining a nested form:

// Define the shape of your form data
export class UserAddressModel {
  public street = '';
  public city = '';
  public postalCode = '';
}

export class UserProfileModel {
  public firstName = '';
  public lastName = '';
  public address = new UserAddressModel();
}

// Define a schema for nested form validation
const addressSchema = object<UserAddressModel>({
  street: string().notNullable().required('Street is required'),
  city: string().notNullable().required('City is required'),
  postalCode: string().notNullable().required('Postal code is required')
});

const userSchema = object<UserProfileModel>({
  firstName: string().notNullable().required('First name is required'),
  lastName: string().notNullable().required('Last name is required'),
  address: addressSchema // Nested validation schema
});

// Create a form instance with default values and validation
export const useUserProfileForm = () => {
  return useForm<UserProfileModel>(new UserProfileModel(), {
    validate: (form) => {
      return userSchema.validate(form);
    },
    validateDefault: true
  });
};

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