React Formulation

Easy form validation

Inspired by react-reformed

Table of Contents

1. Installation
2. Demo
3. Usage
4. HOC
5. Inline Form
6. Advanced
7. Custom validation rules
8. Custom error messages
9. API
10. Component options

Installation

npm install @bynder/react-formulation --save

Demo

If you want to try out a little demo first, you can check it out here or try it yourself:

git clone git@github.com:Bynder/react-formulation.git
cd react-formulation
npm install
npm start

Usage

React formulation offers two types of forms. The first one is a high order component for larger forms, the second one is a component for a form with just one input field and a submit and cancel button.

HOC

If you have a larger form you'll use the High order component:

import { withValidation, Validator } from '@bynder/react-formulation';

@withValidation({
    validateOn: 'change', // optional, default value is 'blur'
    schema: {
        firstname: {
            required: true,
        },
        lastname: {
            minLength: 2,
            maxLength: 30,
        },
        // ...more validation rules
    }
})
class YourForm extends React.Component {
    componentWillMount() {
        this.props.setInitialModel({
        	firstname: 'Foo',
        	lastname: 'Bar',
        });
    }

    onSubmit() {
        // handle submit
    }

    render() {
        // Wrap your entire form in a <Validator.Form> component
        // Add a submit handler
        // Wrap every input in a <Validator> component
        // Provide a name to Validator (must match the name you provided in the schema)
        return (
            <Validator.Form onSubmit={this.onSubmit}>
                <Validator name="firstname">
                    <input />
                </Validator>
                <Validator name="lastname">
                    <input />
                </Validator>
                <button type="submit">Submit</submit>
            </Validator.Form>
        );
    }
}

export default YourForm;

Inline Form

For forms with just a single input you'll use the Inline Form component

import { InlineForm } from '@bynder/react-formulation';

// Wrap your input and buttons in an <InlineForm> component.
// Provide the name of your input, validation rules, initial value,
// and optionally custom messages to this component.
// Add an onSubmit handler.
// Wrap the input in a <InlineForm.Field> component.
const YourInlineForm = () => (
    <InlineForm
        name="firstname"
        initialValue="Foo"
        rules={{
            required: true,
            minLength: 2,
            maxLength: 30,
        }}
        messages={{
            // Custom validation messages
            required: 'Please don\'t leave me empty',
            minLength: condition => `Please use a minimum of ${condition} characters`,
        }}
        onSubmit={(val) => { // handle submit }}
    >
        <InlineForm.Field resetOnEscape>
            <label htmlFor="inlineform-name">Name</label>
            <input id="inlineform-name" />
        </InlineForm.Field>
        <InlineForm.Errors /> // (optional) This will display the error messages
        <InlineForm.Cancel> // (optional) This will reset your form when you click cancel
            <button type="button">
                Cancel
            </button>
        </InlineForm.Cancel>
        <InlineForm.Submit> // (optional) This disables the submit button if the field isn't valid
            <button type="submit">
                Save
            </button>
        </InlineForm.Submit>
);

export default YourInlineForm;

Advanced

The basic usage might not be enough for you. Luckily we added some advanced options.

Custom validation rules

Of course you can add your own validation rules to the schema. Here you can see an example of how that might work:

@withValidation({
    schema: {
        name: {
            required: true, // default validation
            mustNotContainSpecialCharacters: { // custom validation
                test: val => !(/[^a-zA-Z0-9]/).test(val),
                message: 'This field cannot contain special characters',
            },
        },
        // ...
    }
})
// ...

Custom error messages

In the example above you can see that it's possible to add custom validation rules and custom messages for those rules. You can also add custom messages for the default validation rules. You can use this option to add translations.

@withValidation({
    schema: {
        name: {
            required: true,
        },
        // ...
    },
    messages: {
        required: 'This field is required.',
    }
})
// ...

API

The following options are injected by the react-formulation high order component.

setInitialModel(model: Object)

Allows you to set the initial values of the model

Usage:

this.props.setInitialModel({
    firstname: 'Foo',
    lastname: 'Bar',
});

isTouched: boolean

Returns true if any of the fields have been changed, otherwise returns false.

Usage:

this.props.isTouched;

getSchema(name: String)

Returns the errors for the given input (name).

Usage:

this.props.getSchema('lastname');

Returns:

// console.log(this.props.getSchema('lastname'));
{
    errors: [{
        condition: true,
        rule: 'required'
    }],
    isTouched: true,
    isValid: false,
}

schema: Object

Returns the complete error schema.

Usage:

<button disabled={!this.props.schema.isValid && !this.props.isTouched} />

Returns:

// console.log(this.props.schema);
{
    isValid: true,
    fields: {
        firstname: {
            errors: [],
            isTouched: true,
            isValid: true
        },
        lastname: {
            errors: [{
                condition: true,
                rule: 'required'
            }],
            isTouched: true,
            isValid: false,
        }
    }
}

validateForm(initialModel: Object [optional])

Validates the entire form.

Usage:

this.props.validateForm();

setProperty(prop: String, value: Any)

Set a specific property on a model.

Usage:

this.props.setProperty('firstname', 'foo');

setModel(model: Object)

Override the existing model

Usage:

this.props.setModel({
    firstname: 'bar',
    lastname: 'foo',
});

isButtonDisabled: boolean

Tells you if your submit button should be disabled.

Usage:

<button type="submit" disabled={this.props.isButtonDisabled} />

resetValidation(): Function

Removes the validation errors from your form, sets isValid to null.

Usage:

this.props.resetValidation();

Returns:

// console.log(this.props.schema);
{
    isValid: null,
    fields: {
        firstname: {
            errors: [],
            isTouched: false,
            isValid: null
        },
        // ...
    }
}

clearForm(): Function

Removes all values from all models.

Usage:

this.props.clearForm();

resetForm(): Function

Resets the validation and sets the form to its initial model.

Usage:

this.props.resetForm();

setTouched(): Function

Sets the forms touched state to true.

Usage:

this.props.setTouched();

setUntouched(): Function

Sets the forms touched state to false.

Usage:

this.props.setUntouched();

model: Object

Returns the complete model.

Usage:

this.props.model;

Returns

{
    firstname: {
        isTouched: false,
        value: 'Foo'
    },
    lastname: {
        isTouched: true,
        value: 'Bar'
    },
    phone: {
        isTouched: false,
        value: '0123456789'
    }
}

Component options

<Validator />

Property	Type	Default	Description
name	string	undefined	Name of the model
hideErrors	bool	false	Hide error messages

<Validator.Form />

Property	Type	Default	Description
onSubmit	func	undefined	Submit handler
... props

<InlineForm />

Property	Type	Default	Description
name	string	undefined	Name of the model
initialValue	object	undefined	Initial value of the model
onSubmit	func	undefined	Submit handler
rules	object	undefined	Validation rules
messages	object	undefined	Custom validation messages
... props

<InlineForm.Field />

Property	Type	Default	Description
resetOnEscape	bool	false	Resets the input value on escape
... props

<InlineForm.Errors />

Property	Type	Default	Description
... props

<InlineForm.Cancel />

Property	Type	Default	Description
style	object	{ display: 'inline' }	CSS style attribute
... props

<InlineForm.Submit />

Property	Type	Default	Description
style	object	{ display: 'inline' }	CSS style attribute
... props