How to add global loading/spin effect in axios int

问题:

I am use axios for API call in a React project, and I want to add a loading or spinning effect globally in between a api call's request and response in my axios interceptor, here is the code of my interceptor.

import Axios from 'axios'

Axios.interceptors.request.use(function (config) {
  // spinning start to show
  const token = window.localStorage.token;
  if (token) {
     config.headers.Authorization = `token ${token}`
  }
  return config
}, function (error) {
  return Promise.reject(error);
});

Axios.interceptors.response.use(function (response) {
  // spinning hide
  return response;
}, function (error) {
  return Promise.reject(error);
});

回答1:

Perhaps you could take a simpler approach, where you display a full-screen loading message while your app is busy loading data via axios?

For example, you could make the following additions to your code/project to show a global "loading message" on screen while during axio requests:

CSS:

/* Define css class for global loading message to cover 
   screen during axios operations */

.loading-indicator:before {
    content: '';
    background: #000000cc;
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
}

.loading-indicator:after {
    content: 'Loading';
    position: fixed;
    width: 100%;
    top: 50%;
    left: 0;
    z-index: 1001;
    color:white;
    text-align:center;
    font-weight:bold;
    font-size:1.5rem;        
}

Javascript:

Axios.interceptors.request.use(function (config) {

  // spinning start to show
  // UPDATE: Add this code to show global loading indicator
  document.body.classList.add('loading-indicator');

  const token = window.localStorage.token;
  if (token) {
     config.headers.Authorization = `token ${token}`
  }
  return config
}, function (error) {
  return Promise.reject(error);
});

Axios.interceptors.response.use(function (response) {

  // spinning hide
  // UPDATE: Add this code to hide global loading indicator
  document.body.classList.remove('loading-indicator');

  return response;
}, function (error) {
  return Promise.reject(error);
});

Using this method, you could even use CSS3 animations to replace the "loading" message with a animated spinner, or something similar - hope this helps!

回答2:

You can setup axios interceptors in a higher level component let's say App. You can define a loading state in the reducer with "SHOW_LOADER" & "HIDE_LOADER" action types. These interceptors will dispatch the corresponding actions before a request is sent and received via axios, updating the loading state in store through which you can render a Loader component.

Hope this answers your question.

App Component

import React from 'react';
import axios from 'axios'
import { connect } from 'react-redux';
import { loading } from '../actions'
import Loader from './Loader'

class App extends React.Component{
 componentWillMount(){
   const self = this
   axios.interceptors.request.use(function (config) {
     // spinning start to show
     self.props.loading(true)
     return config
    }, function (error) {
      return Promise.reject(error);
    });

    axios.interceptors.response.use(function (response) {
     // spinning hide
      self.props.loading(false)

     return response;
   }, function (error) {
     return Promise.reject(error);
   });
 }
 render(){
   return (
    <div>
      { this.props.loader ? <Loader /> : null }

      {/* 
        Your other components
      */}
    </div>
   )
 }

}

const mapStateToProps = (state)=>{
  return {
    loader: state.loader
  }
}

export default connect(mapStateToProps,{
  loading
})(App);

Loader Reducer

const loader = (state = false, action) => {
    switch (action.type) {
        case "SHOW_LOADER":
            return action.data;
            break;
        case "HIDE_LOADER":
            return action.data;
            break;
        default:
            return state;
    }
}

export default loader;

Action

export const loading = (bool)=>{
  return bool ? {
    type:"SHOW_LOADER",
    data:bool
  }: {
    type: "HIDE_LOADER",
    data: bool
  }
}