Global-Emitter

A global storage that emits events when an item changes.

Install

$ npm i -S @logicamente.info/global-emitter # NPM user
$ yarn add @logicamente.info/global-emitter # YARN user

How to use it

// LISTENER
const { globalEmitter } = require('@logicamente.info/global-emitter');
globalEmitter.on('Item', console.log);

[...]

// PROVIDER
const { setGlobal } = require('@logicamente.info/global-emitter');
setGlobal('Item', 10); // Storages at global and emits to all listeners

// console output: 10

React sample

App contains Form and List components. When a new text is submited at Form, it executes setGlobal to perform a emission. List sets a listener at its componentDidMount that runs appendText on every emission.

No more props (or other complex state managers) to make components communicate!

import React, { Component } from 'react';
import { globalEmitter, setGlobal } from '@logicamente.info/global-emitter';

class App extends Component {
  render() {
    return (
      <div>
        <Form />
        <List />
      </div>
    )
  }
}

class Form extends Component {
  state = {}

  onSubmit(e) {
    e.preventDefault();
    setGlobal('TextForm', this.state.text);
    this.setState({ text: '' });
  }

  render() {
    return (
      <form onSubmit={this.onSubmit.bind(this)}>
        <input type="text" placeholder="write something..." required
          value={this.state.text}
          onChange={(e) => this.setState({ text: e.target.value })}
        />
        <button type="submit">Send</button>
      </form>
    );
  }
}

class List extends Component {
  state = { list: [] };

  componentDidMount() {
    globalEmitter.on('TextForm', this.appendText.bind(this));
  }

  appendText(text) {
    this.setState({ list: this.state.list.concat([text]) });
  }

  render() {
    return (
      <ul>
        {this.state.list.map((l, i) => <li key={i}>{l}</li>)}
      </ul>
    );
  }
}