React Schema

Installation

yarn

yarn add @traveloka/react-schema-form

npm

npm i @traveloka/react-schema-form --save

Motivation

Form is common in any application. The final result of form is data. This library would separate the UI and Form logic by giving basic API to Field Component. The flow how to get the data, would be the responsible of the Field Component.

Getting Started

Basic Usage

// InputField.js

import React from 'react';

export default function InputField({ onChange, value, ...rest }) {
  return (
    <input onChange={(e) => onChange(e.target.value)} value={value} {...rest} />
  );
}

// LoginForm.js

import React from 'react';
import { Form, Field } from '@traveloka/react-schema-form';  // ES6
import InputField from './InputField';

export default class LoginForm extends React.Component {

  form = null;

  render() {
    return (
      <React.Fragment>
        <Form fieldRef={(el) => form = el}>
          <Field name="email" component={InputField} />
          <Field name="password" component={InputField} type="password"/>
        </Form>
        <button onClick={this.handleSubmit}>Submit</button>
      </React.Fragment>
    );
  }

  handleSubmit = () => {
    this.props.onSubmit(this.form.getValues());
  }
}

Documentation

- Field

Importing

var Field = require('@traveloka/react-schema-form').Field;  // ES5

import { Field } from '@traveloka/react-schema-form';  // ES6

Props

Property	Type	Default Value	Description
name	string	none	required
fieldRef	React.createRef	none	to be able access field methods.
component	React.ClassComponent	none	required
revalidateOnError	boolean	true	will auto validate when have an error
validateOnChange	boolean	false	will auto validate when value is changes
normalize	function	(value) => value	will serialize the value
defaultValue	any		default value.
rules	func	array of func

Methods

Methods	Description
getValue() => any	return current field value
setValue(newValue: any) => any	set current field value
getError() => ValidationResult	return current field error message
setError(error: ValidationResult) => ValidationResult	set current field error
validate() => ValidationResult	trigger field to validate
reset() => void	reset field to defaultValue, and remove error
initialize(value: any) => any	set field defaultValue
getDefaultValue() => any	get field defaultValue
hasError() => boolean	return true if field have an error
isDirty() => boolean	return true if field value is not same with defaultValue

Given Props to Field Component

Methods	Description
name: String	the Field name
label: String	UC Words of name
isDirty: Boolean	state of the changes value of field
error: String | null	field error
onChange: (v) => any	function to change field value
value: any	the value of field

Usage

1. A Component

This can be any component class that you have written or have imported from a third party library.

/// MyCustomInput.js
import React, { Component } from 'react'

class MyCustomInput extends Component {
  static propTypes = {
    value: PropTypes.any,
    onChange: PropTypes.func,
    isDirty: PropTypes.bool,
    error: PropTypes.string,
  }

  render() {
    const { value, onChange } = this.props
    return (
      <div>
        <span>The current value is {value}.</span>
        <button type="button" onClick={() => onChange(value + 1)}>Inc</button>
        <button type="button" onClick={() => onChange(value - 1)}>Dec</button>
      </div>
    )
  }
}

Then, somewhere in your form...

import MyCustomInput from './MyCustomInput'
...
<Field name="myField" component={MyCustomInput}/>

2. Validation

Field accept rules as props. Rules can be a function / array of function. Each function accept one arguments, the value. The function just need to return null / string. The return value would be the error message for the field component (eg: if there's no error, return null).

// MyErrorableInput.js

import React from 'react';

export default function MyErrorableInput({ value, onChange, error, ...rest }) {
  return (
    <div>
      <input value={value} onChange={(e) => onChange(e.target.value)} {...rest} />
      {!!error && <div className="error">{error}</div>}
    </div>
  );
}

For rule functions

// isEmail.js
export default function isEmail(value) {
  return value.contains('@') ? null : `${value} is not an email format.`;
}

// maxLength.js
const maxLength = (length) => (value) => {
  return value && value.length <= length ? null : `Length must not exceed ${length} chars.`;
}

Then somewhere in your form...

import isEmail from './isEmail';
import maxLength from './maxLength';
import MyErrorableInput from './MyErrorableInput';

<Field name="email" component={MyCustomInput} rules={[isEmail, maxLength(10)]}>

- Form

Props

Property	Type	Default Value	Description
array	boolean	false	would return the values as array
normalize	function	(val) => val	a function that normalize the form values
fieldRef	React.createRef	none	to be able access field methods.

Methods

Methods	Description
getValue() => ValueByFieldName	return form value by fieldName
setValue(newValue: ValueByFieldName) => ValueByFieldName	set form value by fieldName
getError() => ValidationResultByFieldName	return form error message by fieldName
setError(error: ValidationResultByFieldName) => ValidationResultByFieldName	set form error by fieldName
validate() => ValidationResultByFieldName	trigger form to validate
reset() => void	reset form to defaultValue, and remove error
initialize(value: ValueByFieldName) => any	set form defaultValue by fieldName
getDefaultValue() => ValueByFieldName	get defaultValue by fieldName
hasError() => boolean	return true if some field have an error
hasErrorField(fieldName: string) => boolean	return true if field have an error
isDirty() => boolean	return true if some field value is not same with defaultValue
isDirtyField(fieldName: string) => boolean	return true if field value is not same with field defaultValue
getValueField(fieldName: string) => any	return field value
setValueField(fieldName: string, value: any) => any	set field value
getErrorField(fieldName: string) => ValidationResult	return field error message
setErrorField(fieldName: string, error: ValidationResult) => ValidationResult	set field error message
validateField(fieldName: string) => ValidationResult	validate specify field

Children Function Params

Property	Type	Description
values	[name: string]: any	form value by fieldName
isDirty	boolean	true if some field value is not same with defaultValue
hasError	boolean	true if some field have an error
error	[name: string]: ValidationResult	form error message by fieldName

Nested Forms

You could also build a nested form like this

<Form fieldRef={form => this.form = form}>
  <div>
    <Field name="email" component={InputField} />
    <Form name="profile">
      <Field name="first" component={InputField} />
      <Field name="last" component={InputField} />
    </Form>
  </div>
</Form>

// when you get value
this.form.getValue()
{
  email: ...,
  profile: {
    first: ...,
    last: ...
  }
}

Playground

• Example 1
• Example 2