react-fetch-preloader

Library for displaying preloader when response is longer than duration.

Motivation

You can see gif right above to understand idea.

Install

npm install --save react-fetch-preloader
yarn add react-fetch-preloader

Components

ShowPreloader

Properties

Required

url

Url of response - string

loaded

React component, when response is successful render this component

Not required

fetch

Function to fetch data. Default - window.fetch

duration

Number - if response is longer this value - show preloader(in ms). Default - 500

errored

React component, when response is failed render this component. Default -

() => null

preloader

React component for display preloader. Default -

() => <span>Loading...</span>

withPreloader HOC component

withPreloader provides two extra functions:

preload

Takes two specified params: id and url

renderPreloader

Takes one specified param: id

You can check example of using HOC in example section

More details and example

Basic examples

API is unstable now, so I need to figure out what will be the best realization.

Multiple fetches fires onClick

You can use ShowPreloader component for this purpose

import React from 'react';
import { ShowPreloader } from 'react-fetch-preloader';
 
const URL = 'https://randomuser.me/api/?results=';
 
const SORT = [1, 10];
 
class App extends React.Component {
  state = {
    item: 10,
  };
 
  setItem = item => () => {
    if (item !== this.state.item) {
      this.setState({ item });
    }
  };
 
  render() {
    const { item } = this.state;
 
    return (
      <div className="App">
        <div className="sort">
          {SORT.map(sort => (
            <button
              type="button"
              onClick={this.setItem(sort)}
              key={sort}
            >
              Load {sort} items
            </button>
          ))}
        </div>
        <ShowPreloader
          duration={300}
          preloader={YourPreloaderComponent}
          loaded={LoadedComponent}
          errored={ErrorComponent}
          url={`${URL}${item}`}
        />
      </div>
    );
  }
}

Fetches with HOC

You can use HOC component to fetch data in different places of your App

import React from 'react';
import ReactDOM from 'react-dom';
import { withPreloader } from 'react-fetch-preloader';
 
import Preloader from './Preloader';
import Card from './Card';
 
import './styles.css';
 
const Error = data => {
  console.log(data);
  return <h1>Oops :( Error</h1>;
};
 
class App extends React.Component {
  preload = (id, url) => () => {
    this.props.preload(id, url);
  };
 
  render() {
    const { renderPreloader } = this.props;
    return (
      <div className="App">
        <div className="sort">
          <button
            type="button"
            onClick={this.preload(1, 'https://randomuser.me/api/?results=20')}
          >
            Load 20 items
          </button>
          <button
            type="button"
            onClick={this.preload(2, 'https://randomuser.me/api/?results=10')}
          >
            Load 10 items
          </button>
        </div>
        <div>Some content here</div>
        {renderPreloader(1, {
          duration: 0,
        })}
        <div>And here...</div>
        {renderPreloader(2)}
      </div>
    );
  }
}
 
const WrappedApp = withPreloader(App);
 
const rootElement = document.getElementById('root');
ReactDOM.render(
  <WrappedApp
    preloadOptions={{
      duration: 1000,
      preloader: Preloader,
      loaded: Card,
      errored: Error,
    }}
  />,
  rootElement,
);

You can clone this repository and check example

git clone https://github.com/mmarkelov/react-preloader.git
cd ./react-preloader/example
yarn && yarn run dev

TODO

• Clearify tests
• Write clearer description
• Write more examples
• SSR