Vfrdtyky

class HttpClient {

  constructor() {

   this.connectionCount$ = new rxjs.BehaviorSubject(0);

   this.loading$ = new rxjs.BehaviorSubject(false);

  }

  

  incrementConnectionCount() {

    this.connectionCount$.next(this.connectionCount$.getValue() + 1);

    if (this.connectionCount$.getValue() === 1) {

      this.loading$.next(true);

    }

  }

  

  decrementConnectionCount() {

    this.connectionCount$.next(this.connectionCount$.getValue() - 1);

    if (this.connectionCount$.getValue() === 0) {

      this.loading$.next(false);

    }

  }



  get(url) {

    this.incrementConnectionCount();

    setTimeout(() => { // Simulate a http call that takes 2 seconds

      this.decrementConnectionCount();

    }, 2000);

  }

  

  // Do the same for the other verbs, put, post, delete etc

}



const httpClient = new HttpClient();



// Anywhere you want a loading spinner subscribe to the loading observable and show and hide the spinner

httpClient.loading$.subscribe(loading => {

  document.getElementById('loading').style.display = loading ? 'block' : 'none';

});



// Show the connection count

httpClient.connectionCount$.subscribe(connectionCount => {

  document.getElementById('connectionCount').innerText = connectionCount;

});



// Each time you click the button you will simulate a http get that takes two seconds, press it multople times and it will show for 2 seconds after the last click

document.getElementById('load').addEventListener('click', () => {

  httpClient.get('someUrl');

});

#loading {

  display: none;

}



svg {

  vertical-align: middle;

}

<script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/6.3.3/rxjs.umd.min.js"></script>



<button id="load">Load</button> Connection count: <span id="connectionCount"></span>



<div id="loading"> <!-- Get a funky loading spinner from loading.io -->

  <svg xmlns="http://www.w3.org/2000/svg" class="lds-cutiefox" width="80px" height="80px" viewBox="0 0 100 100" preserveAspectRatio="xMidYMid">

      <g transform="rotate(80.5368 50 50)">

        <animateTransform attributeName="transform" type="rotate" values="360 50 50;0 50 50" keyTimes="0;1" dur="1.5s" repeatCount="indefinite" calcMode="spline" keySplines="0.5 0 0.5 1" begin="-0.15000000000000002s"/>

        <circle cx="50" cy="50" r="39.891" stroke="#ffc254" stroke-width="14.4" fill="none" stroke-dasharray="0 300">

          <animate attributeName="stroke-dasharray" values="15 300;55.1413599195142 300;15 300" keyTimes="0;0.5;1" dur="1.5s" repeatCount="indefinite" calcMode="linear" keySplines="0 0.4 0.6 1;0.4 0 1 0.6" begin="-0.069s"/>

        </circle>

        <circle cx="50" cy="50" r="39.891" stroke="#fff1cf" stroke-width="7.2" fill="none" stroke-dasharray="0 300">

          <animate attributeName="stroke-dasharray" values="15 300;55.1413599195142 300;15 300" keyTimes="0;0.5;1" dur="1.5s" repeatCount="indefinite" calcMode="linear" keySplines="0 0.4 0.6 1;0.4 0 1 0.6" begin="-0.069s"/>

        </circle>

        <circle cx="50" cy="50" r="32.771" stroke="#000000" stroke-width="1" fill="none" stroke-dasharray="0 300">

          <animate attributeName="stroke-dasharray" values="15 300;45.299378454348094 300;15 300" keyTimes="0;0.5;1" dur="1.5s" repeatCount="indefinite" calcMode="linear" keySplines="0 0.4 0.6 1;0.4 0 1 0.6" begin="-0.069s"/>

        </circle>

        <circle cx="50" cy="50" r="47.171" stroke="#000000" stroke-width="1" fill="none" stroke-dasharray="0 300">

          <animate attributeName="stroke-dasharray" values="15 300;66.03388996804073 300;15 300" keyTimes="0;0.5;1" dur="1.5s" repeatCount="indefinite" calcMode="linear" keySplines="0 0.4 0.6 1;0.4 0 1 0.6" begin="-0.069s"/>

        </circle>

      </g>

      <g transform="rotate(143.103 50 50)">

        <animateTransform attributeName="transform" type="rotate" values="360 50 50;0 50 50" keyTimes="0;1" dur="1.5s" repeatCount="indefinite" calcMode="spline" keySplines="0.5 0 0.5 1"/>



        <path fill="#ffc254" stroke="#000000" d="M97.2,50c0,6.1-1.2,12.2-3.5,17.8l-13.3-5.4c1.6-3.9,2.4-8.2,2.4-12.4"/>

        <path fill="#fff1cf" transform="translate(0,-0.1)" d="M93.6,50c0,1.2,0,2.4-0.1,3.6L93,57.2c-0.4,2-2.3,3.3-4.2,2.8l-0.2-0.1c-1.8-0.5-3.1-2.3-2.7-3.9l0.4-3 c0.1-1,0.1-2,0.1-3"/>

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      </g>

      <g transform="rotate(80.5368 50 50)">

        <animateTransform attributeName="transform" type="rotate" values="360 50 50;0 50 50" keyTimes="0;1" dur="1.5s" repeatCount="indefinite" calcMode="spline" keySplines="0.5 0 0.5 1" begin="-0.15000000000000002s"/>



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      </g></svg>

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</div>