React-polling NPM

🔔 react-polling

Easy to use polling service built with react that follows the render props pattern.

Note: Read more about render props here Render Props Pattern

🚚 Installation

yarn add react-polling

npm i react-polling --save

⚡️ Usage

Default usage (the lib will internally use fetch to make api calls)

import React from 'react';

<ReactPolling
  url={'url to poll'}
  interval= {3000} // in milliseconds(ms)
  retryCount={3} // this is optional
  onSuccess={() => console.log('handle success')}
  onFailure={() => console.log('handle failure')} // this is optional
  method={'GET'}
  headers={headers object} // this is optional
  body={JSON.stringify(data)} // data to send in a post call. Should be stringified always
  render={({ startPolling, stopPolling, isPolling }) => {
    if(isPolling) {
      return (
        <div> Hello I am polling</div>
      );
    } else {
      return (
        <div> Hello I stopped polling</div>
      );
    }
  }}
/>

Custom lib for making api calls (provide us your promise function and we will use that to make api calls)

import React from 'react';
// import of some lib for making http calls
// let's say you are using axios
import axios from "axios";

const fetchData = () => {
  // return a promise
  return axios.get("some polling url");
}

const App = () => {
  return (
    <ReactPolling
      url={'url to poll'}
      interval= {3000} // in milliseconds(ms)
      retryCount={3} // this is optional
      onSuccess={() => console.log('handle success')}
      onFailure={() => console.log('handle failure')} // this is optional
      promise={fetchData} // custom api calling function that should return a promise
      render={({ startPolling, stopPolling, isPolling }) => {
        if(isPolling) {
          return (
            <div> Hello I am polling</div>
          );
        } else {
          return (
            <div> Hello I stopped polling</div>
          );
        }
      }}
    />
  );
}

📒 Api

🔔 react-polling

Props	Type	Default	Description
url	string	null	url/api to poll
interval	number	3000	Interval of polling
retryCount	number	0	Number of times to retry when an api polling call fails
onSuccess	function	-	Callback function on successful polling. This should return true to continue polling
onFailure	function	() => {}	Callback function on failed polling or api failure
method	string	GET	HTTP Method of the api to call
headers	object	-	Any specific http headers that need to be sent with the request
body	object	-	The data that need to be sent in a post/put call
render	function	-	Render function to render the ui
promise	function	-	custom function that should return a promise
backOffFactor	number	1	exponential back off factor for api polling(interval*backOffFactor)
children	function	-	React children function based on child props pattern

onSuccess (required)

This function will be called every time the polling service gets a successful response. You should return true to continue polling and false to stop polling. It has the following signature:

function onSuccess(response) {
  // You can do anything with this response, may be add to an array of some state of your react component
  // return true to continue polling
  // return false to stop polling
}

onFailure (not compulsory field)

This function will be called every time the polling service gets a failure response from the api, it can be 401 or 500 or any failure status code. You can do some cleaning up of your variables or reseting the state here.

function onFailure(error) {
  // You can log this error to some logging service
  // clean up some state and variables.
}

promise (when you need your own api calling logic and not the default fetch which this lib uses)

This function will be called every time the polling service wants to poll for some data. Ideally inside this function you should write your api calling logic.

function fetchPosts() {
  return axios.get("some url");
}

backOffFactor(default is 1) (not compulsory field)

This option is only needed if you want to exponentially increase the rate at which we poll the api. For example

if backOffFactor is 2 and interval is 3000, then the first polling call will be made after 3000ms
Next polling call will happen after interval*backOffFactor = 3000*2 = 6000ms later