fonk-negative-number-validator

This is a fonk microlibrary that brings validation capabilities to:

• Validate if a field of a form is a negative number

How to install it:

npm install @lemoncode/fonk-negative-number-validator --save

How to add it to an existing form validation schema:

We have the following form model:

const myFormValues = {
  product: 'shoes',
  price: 20,
}

We can add a negativeNumber validation to the myFormValues

import { negativeNumber } from '@lemoncode/fonk-negative-number-validator';

const validationSchema = {
  field: {
    price: [negativeNumber.validator],
  },
};

The validator must be configured with the following required arguments:

export interface CustomValidatorArgs {
  strictTypes?: boolean;
  allowZero?: boolean;
}

These are the default arguments:

let defaultCustomArgs: CustomValidatorArgs = {
  strictTypes: false,
  allowZero: false,
};

You can specify the custom arguments in two ways:

• Locally just customize the arguments for this validationSchema (e.g. We can specify if the validator allows zero):

import { negativeNumber } from '@lemoncode/fonk-negative-number-validator';

const validationSchema = {
  field: {
    price: [
      {
        validator: negativeNumber.validator,
        customArgs: { allowZero: true },
      },
    ],
  },
};

• Globally, replace the default custom arguments in all validationSchemas (e.g. enable strict types):

import { negativeNumber } from '@lemoncode/fonk-negative-number-validator';

negativeNumber.setCustomArgs({ strictTypes: true });

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 { negativeNumber } from '@lemoncode/fonk-negative-number-validator';

negativeNumber.setErrorMessage('El campo debe de ser un número negativo');

• Locally just override the error message for this validationSchema:

import { negativeNumber } from '@lemoncode/fonk-negative-number-validator';

const validationSchema = {
  field: {
    price: [
      {
        validator: negativeNumber.validator,
        message: 'Error message only updated for the validation schema',
      },
    ],
  },
};

Please, refer to fonk to know more.

License

MIT

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