Asyncdataloader-react NPM

AsyncDataLoader assumes you are using react-redux (https://github.com/reactjs/react-redux)

AsyncDataLoader is a React Higher Order Component which takes responsibility of fetching data of the Wrapped Component and offers many options like showing an interface preview of the Wrapped Component while data is being fetched, refetch data after specified time.

Installation

npm install asyncdataloader-react --save

Usage

Step-1

Add the reducer to your redux reducers

    import {reducer} from 'asyncdataloader-react';

    const reducers = {
      // your other reducers
      asyncDataLoader: reducer,
    };

Add the following in your redux initial state

export const initialState = {
  // Other inital objects
  asyncDataLoader: {
    components: {},
  },
};

Step-2

    import React, { PropTypes } from 'react';
    import { asyncDataLoader } from 'asyncdataloader-react';


    const InterfacePreview = (props) => <div>Loading</div>;
    const get = (url) =>
      // Return a new promise.
       new Promise((resolve, reject) => {
        // Do the usual XHR stuff
         const req = new XMLHttpRequest();
         req.open('GET', url);

         req.onload = function () {
          // This is called even on 404 etc
          // so check the status
           if (req.status == 200) {
            // Resolve the promise with the response text
             resolve(req.response);
             // Dispatch actions, to store response in redux
           } else {
            // Otherwise reject with the status text
            // which will hopefully be a meaningful error
             reject(Error(req.statusText));
           }
         };

        // Handle network errors
         req.onerror = function () {
           reject(Error('Network Error'));
         };

        // Make the request
         req.send();
       });
    class Example extends React.Component {


      static fetchDataAsync(dispatch, params, location) {
        return get('https://jsonplaceholder.typicode.com/posts/1');
      }
      render() {
        return <div>Success</div>;
      }


    }

    export default asyncDataLoader(Example, {
      componentName: 'Example',
      refreshInterval: 60000,
    },
    InterfacePreview);

It also allows nested components(you can have multiple components with asyncDataLoader nested at different levels).

Parameters

@param {React.Component} WrappedComponent

The Component to be rendered; Component should have a static method with the
signature as follows:

static fetchDataAsync(dispatch, params, location, extraArguments);

If you want to refetch data invoke this.props.fetch() inside the WrappedComponent's methods.

@param {String} options.componentName

componentName needs to be unique,it is used to monitor the load status of
the component. Async Load Status of a Component is of the form :

 asyncLoadStatus[componentName] : {
  loaded: 1/2/3,(1: Loaded Successfully, 2: Not Loaded, 3: Error while Loading)
  loadCount: 1...,
  loadTime: 12345(in milliseconds),
}

@param {Number} options.refreshInterval

refreshInterval is the time specified in milliseconds. After every specified milliseconds, data is fetched again. If not specified, data is only fetched once.

@param {function} options.wrappedComponentMapStateToProps

If the component needs to be connected to the redux store using 'connect' from 'react-redux',then specify mapStateToProps as wrappedComponentMapStateToProps

@param {type} options.wrappedComponentMapDispatchToProps

@param {type} options.enforceNoPreview

If specified, shows no preview before fetching data

@param {React.Component} InterfacePreview

Specify InterfacePreview if you want to specify custom preview to your Component while the data is being fetched. If not specified, a default loading gif is shown