React Redux Loading Bar

A React component that provides Loading Bar (aka Progress Bar) for long running tasks. Works out of the box with redux-promise-middleware and can be easily tweaked for other usage.

Consists of:

• React component — displays loading bar and simulates progress
• Redux reducer — manages loading bar's part of the store
• Redux middleware — dispatches SHOW/HIDE for actions with promises

Examples

See Demo or its source code.

Installation

npm install --save react-redux-loading-bar

Usage

Mount the LoadingBar component anywhere in your application:

import LoadingBar from 'react-redux-loading-bar'

export default class Header extends React.Component {
  render() {
    return (
      <header>
        <LoadingBar />
      </header>
    )
  }
}

Good news is that it doesn't include any positioning, so you can attach it to the top of any block or the whole page.

Install the reducer to the store:

import { combineReducers } from 'redux'
import { loadingBarReducer } from 'react-redux-loading-bar'

const reducer = combineReducers({
  // app reducers
  loadingBar: loadingBarReducer,
})

(Optional) Apply middleware to automatically show and hide loading bar on actions with promises:

import { createStore, applyMiddleware } from 'redux'
import { loadingBarMiddleware } from 'react-redux-loading-bar'
import rootReducer from './reducers'

const store = createStore(
  rootReducer,
  // promise middleware
  applyMiddleware(loadingBarMiddleware())
)

Usage with custom suffixes or another Promise Middleware

You can configure promise type suffixes that are used in your project:

import { createStore, applyMiddleware } from 'redux'
import { loadingBarMiddleware } from 'react-redux-loading-bar'
import rootReducer from './reducers'

const store = createStore(
  rootReducer,
  applyMiddleware(
    loadingBarMiddleware({
      promiseTypeSuffixes: ['REQUEST', 'SUCCESS', 'FAILURE'],
    })
  )
)

If you're not using redux-promise-middleware or any other promise middleware, you can skip installing the loadingBarMiddleware() and dispatch SHOW/HIDE actions manually. The other option is to write your own middleware that will be similar to the bundled one.

Usage without middleware

You can dispatch SHOW/HIDE actions wherever you want by importing the corresponding action creators:

import { showLoading, hideLoading } from 'react-redux-loading-bar'

dispatch(showLoading())
// do long running stuff
dispatch(hideLoading())

You need to dispatch HIDE as many times as SHOW was dispatched to make the bar disappear. In other words, the loading bar is shown until all long running tasks complete.

Usage with redux-saga

Install the loadingBarMiddleware() and mount Loading Bar in your application. You can import and dispatch showLoading and hideLoading from your sagas.

import { showLoading, hideLoading } from 'react-redux-loading-bar'

export function* fetchData() {
  try {
    yield put(showLoading())
    const payload = yield call(API, params)
    // payload processing
  } finally {
    yield put(hideLoading())
  }
}

Usage with jQuery Ajax Requests

If you happen to use jQuery for Ajax requests, you can dispatch SHOW/HIDE actions on ajaxStart/ajaxStop global events:

$(document).on('ajaxStart', this.props.actions.showLoading)
$(document).on('ajaxStop', this.props.actions.hideLoading)

See a demo or checkout the code.

Styling

You can apply custom styling right on the LoadingBar component. For example you can change the color and height of the loading bar:

<LoadingBar style={{ backgroundColor: 'blue', height: '5px' }} />

Alternatively, you can specify your own CSS class.

Please note that will disable default styling (which is color: red; height: 3px; position: absolute;).

<LoadingBar className="loading" />

Don't forget to set height, color and position for the loading class in your CSS files.

Configure Progress Simulation

You can change updateTime (by default 200ms), maxProgress (by default 90%) and progressIncrease (by default 5%):

<LoadingBar updateTime={100} maxProgress={95} progressIncrease={10} />

Tests

npm test

Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code.

To see what has changed in recent versions of Loading Bar, see the CHANGELOG.

Licensed MIT. Copyright 2016-current Anton Mironov.