how to show loader in react . using hooks

Question

I am using axios for communicate with server.I want to show loader when user request to server and hide the loader when request is complete

So i make a custom component to do this task .but my UI hang when I click multiple times on same button

const Loader = () => {
    const { loadingCount } = useLoadingState(),
        {showLoading, hideLoading} = useLoadingActions();

    useEffect(()=>{
        const self = this
        axios.interceptors.request.use(function (config) {
            showLoading();
            return config
        }, function (error) {
            return Promise.reject(error);
        });

        axios.interceptors.response.use(function (response) {
            // spinning hide
            // self.props.loading(false)
            hideLoading()
            return response;
        }, function (error) {
            hideLoading();
            return Promise.reject(error);
        });
    })


    return (
        <div>
            {loadingCount > 0 ?<div style={{position:"fixed",display:"flex",justifyContent:"center",alignItems:"center",width:'100%',height:'100%',zIndex:999999}}>
                {/*{loadingCount > 0 ? */}
                <Spin tip="Loading..." style={{zIndex:999999}}></Spin>
                {/*: null}*/}
            </div>: null}
        </div>





    );
};

Problem is on useeffect

when I comment out useEffect code it works perfectly .

NoTe : showloading and hideloading increase and decrease the loading count.

I think I have deallocate axios object the when component is unmount.???

Solution 1

Add empty array to sencod parameter to useEffect.
It works like componentDidMount() in functional component.

const { useState, useEffect } = React;

const Counter = () => {
  const [count, setCount] = useState(0)
  const [isLoaded, setIsLoaded] = useState(false);
  
  useEffect(() => {
    setTimeout(() => {
      setIsLoaded(true);
    }, 3000);
  }, []); // here

  return (
    <div>
      {
        isLoaded &&
        <div>
          <p>You clicked {count} times</p>
          <button onClick={() => setCount(count + 1)}>
            Click me
          </button>
        </div>
      }
    </div>
  )
}

ReactDOM.render(<Counter />, document.getElementById('app'))

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.7.0-alpha.2/umd/react.development.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.7.0-alpha.2/umd/react-dom.production.min.js"></script>
<div id="app"></div>

Solution 2

i usualy use this code to show loading when request data is processing and hide when it's done

const Loader = () => {
   const {data, setdata} = useState([])
  
    useEffect(()=>{
        axios.get('your host').then(res => {
           setdata(res.data);        
        }).catch(err => {
          setdata(res.data);
        }
    });


    return (
        <div>
            {data.length > 0 
            ?
              <div style={{position:"fixed",display:"flex",justifyContent:"center",alignItems:"center",width:'100%',height:'100%',zIndex:999999}}> </div>
             :
             <Spin tip="Loading..." style=        {{zIndex:999999}}>
             </Spin>
        </div>
    );
};

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>