redux-on-action

Do something async when Redux action happens. Yet another (tiny, ~185 bytes) Redux async middleware.

Table of Contents

• Install
• Usage
• API
• License

Install

npm install --save redux-on-action

Usage

First you have to apply the middleware:

import { createStore, applyMiddleware } from 'redux';
import createOnActionMiddleware from 'redux-on-action';
import rootReducer from './reducers/index';

const { middleware, onAction } = createOnActionMiddleware();

const store = createStore(
  rootReducer,
  applyMiddleware(middleware),
);

Then you can setup action listener:

onAction('IMPORT_START_REQUEST', async (action, dispatch, getState) => {
  dispatch({ type: 'IMPORT_STARTED' });

  await importDirectory(
    action.payload.directoryPath,
    importedFileCount => dispatch({ type: 'IMPORT_PROGRESS', payload: importedFileCount }),
  );

  dispatch({ type: 'IMPORT_FINISHED' });
});

API

createOnActionMiddleware

Returns object with fields:

• middleware - Function, Redux middleware.
• onAction - Function, see onAction.

onAction

Registers action listener. When specified action is dispatched - provided function will be called.

Arguments

• action - String, type of Redux action.
• callback - onActionCallback, function that will be called when action is dispatched.

onActionCallback

Function specified as onAction callback.

Arguments

• action - Object, dispatched Redux action.
• dispatch - Function, Redux dispatch function.
• getState - Function, Redux getState function.

Mulitple action listeners

You can setup many listeners for single action type. Every registered callback will be called in order in which they were registered.

onAction('MY_ACTION', () => console.log('first!'));
onAction('MY_ACTION', () => console.log('second!'));

dispatch({ type: 'MY_ACTION' });
// first!
// second!

License

This project is licensed under the MIT license.