Validation component for react-native forms

Simple form validation component for React-Native inspired by formsy-react. Web version: react-material-ui-form-validator

Unfortunately I don't have Mac, so this library is tested only on Android.

Supported types:

• TextInput

Default validation rules:

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

Some rules can accept extra parameter, example:

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

Example

Usage

import React from 'react';
import { Button } from 'react-native';
import { Form, TextValidator } from 'react-native-validator-form';

class MyForm extends React.Component {
    state = {
        email: '',
    }

    handleChange = (email) => {
        this.setState({ email });
    }

    submit = () => {
        // your submit logic
    }

    handleSubmit = () => {
        this.refs.form.submit();
    }

    render() {
        const { email } = this.state;
        return (
            <Form
                ref="form"
                onSubmit={this.handleSubmit}
            >
                <TextValidator
                    name="email"
                    label="email"
                    validators={['required', 'isEmail']}
                    errorMessages={['This field is required', 'Email invalid']}
                    placeholder="Your email"
                    type="text"
                    keyboardType="email-address"
                    value={email}
                    onChangeText={this.handleChange}
                />
                 <Button
                    title="Submit"
                    onPress={this.handleSubmit}
                />
            </Form>
        );
    }
}

You can add your own rules

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

And remove them

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

Usage

import React from 'react';
import { Button } from 'react-native';
import { Form, TextValidator } from 'react-native-validator-form';

class ResetPasswordForm extends React.Component {
    state = {
        user: {},
    }

    componentWillMount() {
        // custom rule will have name 'isPasswordMatch'
        Form.addValidationRule('isPasswordMatch', (value) => {
            if (value !== this.state.user.password) {
                return false;
            }
            return true;
        });
    }

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

    handlePassword = (event) => {
        const { user } = this.state;
        user.password = event.nativeEvent.text;
        this.setState({ user });
    }

    handleRepeatPassword = (event) => {
        const { user } = this.state;
        user.repeatPassword = event.nativeEvent.text;
        this.setState({ user });
    }

    submit = () => {
        // your submit logic
    }

    handleSubmit = () => {
        this.refs.form.submit();
    }

    render() {
        const { user } = this.state;
        return (
            <Form
                ref="form"
                onSubmit={this.handleSubmit}
            >
                <TextValidator
                    name="password"
                    label="text"
                    secureTextEntry
                    validators={['required']}
                    errorMessages={['This field is required']}
                    type="text"
                    value={user.password}
                    onChange={this.handlePassword}
                />
                <TextValidator
                    name="repeatPassword"
                    label="text"
                    secureTextEntry
                    validators={['isPasswordMatch','required']}
                    errorMessages={['Password mismatch','This field is required']}
                    type="text"
                    value={user.repeatPassword}
                    onChange={this.handleRepeatPassword}
                />
                <Button
                    title="Submit"
                    onPress={this.handleSubmit}
                />
            </Form>
        );
    }
}

Advanced usage

API

Form

• 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 | Descriptipon | |------------------|--------|--------|----------------------------------------------------| | 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 (Input)

• 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 | | errorStyle | false | object | { container: { top: 0, left: 0, position: 'absolute' }, text: { color: 'red' }, underlineValidColor: 'gray', underlineInvalidColor: 'red' } } | Error styles | | 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 | Descriptipon | |------------------|--------|--------|----------------------------------------------------| | 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 |

Contributing

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