rule

Specification

A synchronous rule applied to the field as the top priority validation. When the rule rejects, all the remaining validation chain is ignored.

Definition

type Rule = RegExp | (params) => boolean

Parameters

The following parameters are exposed to the rule when it is a function:

Parameter name

Type

Description

get

Function

value

any

The current value of the field.

fieldProps

Object

Props of the current field.

fields

Object

Map of all fields.

form

Object

A reference to the current Form

Example

Regular expression

import React from 'react'
import { Form } from 'react-advanced-form'
import { Input } from 'react-advanced-form-addons'

export default class Example extends React.Component {
  render() {
    return (
      <Form>
        <Input
          name="username"
          rule={/^\d+/} />
      </Form>
    )
  }
}

Resolver function

import React from 'react'
import { Form } from 'react-advanced-form'
import { Input } from 'react-advanced-form-addons'

export default class Example extends React.Component {
  validateUsername = ({ get, value, fieldProps, fields, form }) => {
    /* "username" is valid only when equals to "foo" */
    return value === 'foo'
  }
  
  render() {
    return (
      <Form>
        <Input
          name="username"
          rule={this.validateUsername} />
      </Form>
    )
  }
}

Reactive rule

import React from 'react'
import { Form } from 'react-advanced-form'
import { Input } from 'react-advanced-form-addons'

export default class Example extends React.Component {
  render() {
    return (
      <Form>
        <Input
          name="password"
          type="password"
          required />
        <Input
          name="confirmPassword"
          rule={({ get, value }) => {
            /* Valid only when equals to "password" field's value */
            return value === get(['password', 'value'])
          }}
          required />
      </Form>
    )
  }
}

Read more about Reactive props feature, it is a game-changer.

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