fonk-required-by-field-validator

This is a fonk microlibrary that brings validation capabilities to:

• Validate if a field of a form is required by another field.

How to install it:

npm install @lemoncode/fonk-required-by-field-validator --save

How to add it to an existing form validation schema:

We have the following form model:

const myFormValues = {
  person : 'John',
  country: 'U.S.A',
  state: 'California',
}

We can add a requiredByField validation to the myFormValues

import { requiredByField } from '@lemoncode/fonk-required-by-field-validator';

const validationSchema = {
  field: {
    state: [
      {
        validator: requiredByField.validator,
        customArgs: {
          field: 'country',
          value: 'U.S.A',
        },
      },
    ],
  },
};

• Or with a condition:

import { requiredByField } from '@lemoncode/fonk-required-by-field-validator';

const validationSchema = {
  field: {
    state: [
      {
        validator: requiredByField.validator,
        customArgs: {
          field: 'country',
          condition: fieldValue =>
            fieldValue === 'U.S.A' || fieldValue === 'Australia',
        },
      },
    ],
  },
};

• Another condition:

import { requiredByField } from '@lemoncode/fonk-required-by-field-validator';

const validationSchema = {
  field: {
    state: [
      {
        validator: requiredByField.validator,
        customArgs: {
          field: 'country',
          condition: (fieldValue, values) =>
            fieldValue === 'U.S.A' && values.person === 'John',
        },
      },
    ],
  },
};

You can customize the error message displayed in two ways:

• Globally, replace the default error message in all validationSchemas (e.g. porting to spanish):

import { requiredByField } from '@lemoncode/fonk-required-by-field-validator';

requiredByField.setErrorMessage('El campo es requerido');

• Locally just override the error message for this validationSchema:

import { requiredByField } from '@lemoncode/fonk-required-by-field-validator';

const validationSchema = {
  field: {
    state: [
      {
        validator: requiredByField.validator,
        customArgs: {
          field: 'country',
          value: 'U.S.A',
        },
        message: 'Required field',
      },
    ],
  },
};

Please, refer to fonk to know more.

License

MIT

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