react-validation-provider v0.1.19

React Validation Provider

Non-intrusive validation library for React

Requirements

Changelog

View changelog

Installation

npm install --save react-validation-provider

Example usage

The first you need to define in you application is the form element types that is going to be validated. This is done by wrapping the input elements/components inside a react component that is decorated with @validate decorator.

import { validate } from 'react-validation-provider';

@validate()
export default class TextInput extends React.Component {
  render() {
    return (
      <input type="text" {...this.props} />
    );
  }
}

//alternative without using decorator
import { validate } from 'react-validation-provider';

class TextInput extends React.Component {
  render() {
    return (
        <input type="text" {...this.props} />
    );
  }
}

export default validate()(TextInput);

Afterwards you simply place these components inside your form components

    <label>Name</label>
    <TextInput value={this.state.name}
               onChange={(ev) => this.setState({name: ev.target.value})}
               rules={[required]} />
    <label>Year</label>
    <TextInput value={this.state.year}
               onChange={(ev) => this.setState({year: ev.target.value})}
               rules={[required, year]} />

The rules prop is a special prop used by the component to validate the value prop of the wrapped component. The rules are simply implemented by defining and object with a validation expression and a message hint method.

export const required = (message = "Required field") => {
  return {
    handlesNull: true,
    validate: value => {
        return value != null && !!value.trim();
    },
    hint: () => {
        return message;
    }
  };
};

// 1900 - 2099
export const year = (message = "Invalid year") => {
  return {
    validate: value => {
        return /^(19|20)\d{2}$/.test(value);
    },
    hint: () => {
        return message;
    }
  };
};

The last thing you have to define the the validation scope. This is typically the top most form component that contains all the input components that are going to be evaluate. The result of the evaluated validation is injected into the isValid prop.

import React from 'react';
import { scope, isValid } from 'react-validation-provider';
import TextInput from './my-test-input';

@scope() // the validation boundary
@isValid // inject the result (props.isValid)
export default class MyForm extends React.Component {

  state = {
    name: null,
    year: null
  };

  onSubmit() {
    // submit data to api...
  }

  render() {
    return(
      <div>
        <label>Name</label>
        <TextInput
          value={this.state.name}
          onChange={(ev) => this.setState({name: ev.target.value})}
          rules={[required]} />
        <label>Year</label>
        <TextInput
          value={this.state.year}
          onChange={(ev) => this.setState({year: ev.target.value})}
          rules={[required, year]} />

        <button
          disabled={!this.props.isValid}
          onClick={() => this.onSubmit()}>Submit</button>
      </div>
    );
  }
}