Validation component for react forms

Simple form validation component for react forms inspired by formsy-react

Default validation rules:

• matchRegexp
• isEmail
• isEmpty
• required
• trim
• isNumber
• isFloat
• isPositive
• minNumber
• maxNumber
• minFloat
• maxFloat
• minStringLength
• maxStringLength
• isString
• maxFileSize
• allowedExtensions

Some rules can accept extra parameter, example:

<YourValidationInput
   {...someProps}
   validators={['minNumber:0', 'maxNumber:255', 'matchRegexp:^[0-9]$']}
/>

Usage

import React from 'react';
import { ValidatorComponent } from 'react-form-validator-core';

class TextValidator extends ValidatorComponent {

    render() {
        const { errorMessages, validators, requiredError, validatorListener, ...rest } = this.props;

        return (
            <div>
                <input
                    {...rest}
                    ref={(r) => { this.input = r; }}
                />
                {this.errorText()}
            </div>
        );
    }

    errorText() {
        const { isValid } = this.state;

        if (isValid) {
            return null;
        }

        return (
            <div style={{ color: 'red' }}>
                {this.getErrorMessage()}
            </div>
        );
    }
}

export default TextValidator;

...
import { ValidatorForm } from 'react-form-validator-core';
...
render() {
    return (
        <ValidatorForm
            ref="form"
            onSubmit={this.handleSubmit}
        >
            <TextValidator
                onChange={this.handleChange}
                name="email"
                value={email}
                validators={['required', 'isEmail']}
                errorMessages={['this field is required', 'email is not valid']}
            />
            <button type="submit">submit</button>
        </ValidatorForm>
    );
}
...

class FileValidator extends ValidatorComponent {
  render() {
    const { errorMessages, validators, requiredError, validatorListener, value, ...rest } = this.props;
    return (
      <div>
        <input type="file" {...rest}>
        {this.errorText()}
      </div>
    );
  }

  errorText() {
    const { isValid } = this.state;

    if (isValid) {
      return null;
    }

    return <div style={{ color: "red" }}>{this.getErrorMessage()}</div>;
  }
}
export default FileValidator;

...
import { ValidatorForm } from 'react-form-validator-core';
...
render() {
    return (
        <ValidatorForm
            ref="form"
            onSubmit={this.handleSubmit}
        >
            <FileValidator
                onChange={this.handleChange}
                name="file"
                type="file"
                value={file}
                validators={['isFile', 'maxFileSize:' + 1 * 1024 * 1024, 'allowedExtensions:image/png,image/jpeg']}
                errorMessages={['File is not valid', 'Size must not exceed 1MB', 'Only png and jpeg']}
            />
            <button type="submit">submit</button>
        </ValidatorForm>
    );
}
...

You can add your own rules

ValidatorForm.addValidationRule('isPasswordMatch', (value) => {
    if (value !== this.state.user.password) {
        return false;
    }
    return true;
});

And remove them

componentWillUnmount() {
    ValidatorForm.removeValidationRule('isPasswordMatch');
}

API

ValidatorForm

• Props

Prop	Required	Type	Default value	Description
onSubmit	true	function		Callback for form that fires when all validations are passed
instantValidate	false	bool	true	If true, form will be validated after each field change. If false, form will be validated only after clicking submit button.
onError	false	function		Callback for form that fires when some of validations are not passed. It will return array of elements which not valid.
debounceTime	false	number	0	Debounce time for validation i.e. your validation will run after debounceTime ms when you stop changing your input

• Methods

Name	Params	Return	Description
resetValidations			Reset validation messages for all validated inputs
isFormValid	dryRun: bool (default true)	Promise	Get form validation state in a Promise (true if whole form is valid). Run with dryRun = false to show validation errors on form

All validated fields (ValidatorComponent)

• Props

Prop	Required	Type	Default value	Description
validators	false	array		Array of validators. See list of default validators above.
errorMessages	false	array		Array of error messages. Order of messages should be the same as validators prop.
name	true	string		Name of input
validatorListener	false	function		It triggers after each validation. It will return true or false
withRequiredValidator	false	bool		Allow to use required validator in any validation trigger, not only form submit

• Methods

Name	Params	Return	Description
getErrorMessage			Get error validation message
validate	value: any, includeRequired: bool		Run validation for current component
isValid		bool	Return current validation state
makeInvalid			Set invalid validation state
makeValid			Set valid validation state

Implementations

• material-ui

Contributing

This component covers all my needs, but feel free to contribute.