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react-state-helpers

v1.6.6

Published

component state helpers for react to help reduce boilerplate and to not rely on redux for everything

Downloads

461

Readme

React State Helpers

npm version Build Status Code Climate

Installation

yarn add react-state-helpers

Higher Order Component Wrapper

You can add react-state-helpers to any project quickly and easily with the supplied decorator.

import React, { Component } from 'react';
import wrapStateHelpers from 'react-state-helpers';

// login could be a function that takes on object with the keys:
// userName, and password
import { login } from 'src/api';

@wrapStateHelpers
export default class Example extends Component {
  componentDidMount() {
    this.props.setWrappingState({
      userName: ''
    });
  }

  render() {
    const {
      handleSubmit, mut,
      values: { userName }
    } = this.props;

    return (
      <div>
        Welcome, { userName }!
        <form onSubmit={handleSubmit(login)}>
          <input name='userName' type='text' onChange={mut('userName')}/>
          <input name='password' type='password' />

          <input type='submit' value='Login' />
        </form>
      </div>
    )
  }
}

If you are on an older version of Javascript you can use the following syntax for the same results...

import React, { Component } from 'react';
import wrapStateHelpers from 'react-state-helpers';

class Example extends Component {
  // ... methods are the same
}
export default wrapStateHelpers(Example);

Mut Usage

Arguments:
string (string): The name of the mutating property as it appears in the component state.
[function = () => {}] (function): A preprocessing function

import React, { Component } from 'react';
import wrapStateHelpers from 'react-state-helpers';

@wrapStateHelpers
export default class Example extends Component {

  render() {
    // mut is a part of the props that wrapStateHelpers brings in.
    const {
      props: {
        mut,
        values: { someKey, someNumber }
      }
    } = this;

    return (
      <input
        type='text'
        value={someKey}
        onChange={mut('someKey')} />
      <input
        type='number'
        value={someNumber}
        onChange={mut('someNumber', parseInt)} />
    );
  }
}

Toggle Usage

Arguments:
string (string): The name of property to be toggled as it appears in the component state.

import React, { Component } from 'react';
import wrapStateHelpers from 'react-state-helpers';
import { Modal, Button } from 'reactstrap'; // external package

@wrapStateHelpers
export default class Example extends Component {
  render() {
    const {
      props: {
        toggle,
        values: { showModal }
      },
    } = this;

    return (
      <div>
        <Button onClick={toggle('showModal')}>Open</Button>
        <Modal isOpen={showModal}>
          <Button onClick={toggle('showModal')}>{'Cancel'}</Button>
        </Modal>
      </div>
    );
  }
}

HandleSubmit Usage

Arguments:

function (function): The handler function for submitting a form.

import React, { Component } from 'react';
import wrapStateHelpers from 'react-state-helpers';
import * as actions from 'src/actions';

const mapStateToProps = state => state;
const mapDispatchToProps = dispatch => ({
  login() {
    dispatch(actions.login);
  }
});

@connect(mapStateToProps, mapDispatchToProps)
@wrapStateHelpers
class Example extends Component {
  render() {
    const { login, handleSubmit } = this.props;

    const submit = values => login(values.username, values.password);

    return(
      <form onSubmit={handleSubmit(submit)}>
        <input name='username' type='text' />
        <input name='password' type='password' />
        <button type='submit'>Login</button>
      </form>
    );
  }
}

Shorthand Redux

With using redux as the source of data, the first paramater of mut becomes irrelevant.

Arguments:

function (function): A redux action that accepts the value of the input as a parameter

import React, { Component } from 'react';
import PropTypes from 'prop-types';
import { bindActionCreators } from 'redux';
import { connect } from 'react-redux';
import wrapStateHelpers from 'react-state-helpers';

import * as actions from 'js/actions';

const mapStateToProps = state => ({
  someKey: state.somewhere.someKey
});

const mapDispatchToProps = dispatch => ({
  setSomeKey: bindActionCreators(actions.somewhere.setSomeKey, dispatch)
});

// Chaining decorators is super easy!
@connect(mapStateToProps, mapDispatchToProps)
@wrapStateHelpers
export default class Example extends Component {
  static propTypes = {
    someKey: PropTypes.string
  }

  render() {
    const { someKey, setSomeKey, withValue } = this.props;

    return (
      <input
        type='text'
        value={someKey}
        onChange={withValue(setSomeKey)} />
    );
  }
}

Available Functions

These functions can be found in your components props after using wrapStateHelpers

  • findValue
    • takes an event or value and returns the value.
    • useful, if you want a common interface for handling events.
      • ex:
        handleChange(e) {
          const value = findValue(e);
          this.setState({ someKey: value });
        }
        
        // in render...
        <input value={someKey} onChange={handleChange} />
  • mut
    • provides a short-hand for setting a state value.
  • toggle
    • set a value in the state to its inverse.
  • handleSubmit
    • creates a helper that will pass in all form values to a callback function.

Want to stop using redux-forms?

Most components don't need to use redux-forms, as many inputs don't need to change the state every onChange, onKeyUp, onKeyDown etc.

Before

import { Field } from 'redux-form';
// ... in render
<Field
  name='firstName'
  component='input'
  type='text' />
<Field
  name='lastName'
  component='input'
  type='text' />
// ...
export default reduxForm({ form: 'formname' })(MyComponent);

After

no reliance on redux!

import wrapStateHelpers from 'react-state-helpers';
// ... before class declaration
@wrapStateHelpers
// ... in render
const {
  props: { mut },
  state: { firstName, lastName }
} = this;
// ... still in render
<input
  value={firstName}
  onChange={mut('firstName')}
  type='text' />
<input
  value={lasteName}
  onChange={mut('lastName')}
  type='text' />