This is a [fonk](https://github.com/Lemoncode/fonk) microlibrary that brings validation capabilities to validate if a field of a form is a negative number
npm install @lemoncode/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:
``bash`
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
`javascript
import { negativeNumber } from '@lemoncode/fonk-negative-number-validator';
const validationSchema = {
field: {
price: [negativeNumber.validator],
},
};
`
The validator must be configured with the following required arguments:
`javascript`
export interface CustomValidatorArgs {
strictTypes?: boolean;
allowZero?: boolean;
}
These are the default arguments:
`javascript`
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):
`javascript
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):
`javascript
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):
`javascript
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:
`javascript
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.
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