Blog post REST API CHART ASYNCHRONOUS LOADING

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>ZingSoft Demo</title>

  <script nonce="undefined" src="https://cdn.zingchart.com/zingchart.min.js"></script>
  <style>
    html,
    body {
      height: 100%;
      width: 100%;
      margin: 0;
      padding: 0;
    }

    #myChart {
      height: 100%;
      width: 100%;
      min-height: 150px;
    }

    .zc-ref {
      display: none;
    }

    #myChart button {
      position: absolute;
      top: 15px;
      left: 10px;
      z-index: 1000;
    }
  </style>
</head>

<body>
  <div id="myChart">
    <a class="zc-ref" href="https://www.zingchart.com">Powered by ZingChart</a>
    <button onclick="window.parent.location.reload()">Reload Data</button>
  </div>
  <script>
    ZC.LICENSE = ["569d52cefae586f634c54f86dc99e6a9", "b55b025e438fa8a98e32482b5f768ff5"]; // make the AJAX request
    var oReq = new XMLHttpRequest();
    oReq.addEventListener("load", renderFirstPlotInChart);
    oReq.open("GET", "https://zingchart-rest-api.glitch.me/api/data/plot/v1");
    oReq.send();

    // define chart JSON
    var myConfig = {
      type: 'bar',
      title: {
        text: 'Multiple Plots Rendering Asynchronously Using API',
        mediaRules: [{
          maxWidth: 500,
          visible: false
        }]
      },
      plot: {
        // barWidth: 25, // this will prevent users from noticing the barwidth changing
        animation: {}, // add animation to make the chart look alive
      },
      legend: {},
      scaleY: {
        values: '0:300:100' // this will prevent users from noticing the scale repaint
      },
      series: [{
        values: [],
        text: '',
      }]
    };

    /*
     * callback for GET request is when we will render the chart
     */
    function renderFirstPlotInChart() {
      myConfig.series[0].values = JSON.parse(this.responseText);
      myConfig.series[0].text = this.responseURL.slice(-2);
      zingchart.render({
        id: 'myChart',
        data: myConfig,
        height: '100%',
        width: '100%'
      });
    }

    /*
     * append the plots using ZingChart API method addplot
     * https://www.zingchart.com/docs/api/methods/#zingchart__exec__api__addplot
     */
    function addAnotherPlot() {
      zingchart.exec('myChart', 'addplot', {
        data: {
          values: JSON.parse(this.responseText),
          text: this.responseURL.slice(-2)
        }
      });
    }
    /*
     * Bind plots after the chart has rendered
     */
    zingchart.bind('myChart', 'load', function(e) {

      /*
       * make AJAX request for the last two plots
       * Use setTimeouts to show what the effect
       * would look like when using large dataset
       */
      setTimeout(function() {

        // call for second dataset
        oReq = new XMLHttpRequest();
        oReq.addEventListener("load", addAnotherPlot);
        oReq.open("GET", "https://zingchart-rest-api.glitch.me/api/data/plot/v2");
        oReq.send();

        // call for third dataset
        setTimeout(function() {
          oReq = new XMLHttpRequest();
          oReq.addEventListener("load", addAnotherPlot);
          oReq.open("GET", "https://zingchart-rest-api.glitch.me/api/data/plot/v3");
          oReq.send();
        }, 1000);

      }, 2000);
    });
  </script>
</body>

</html>

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>ZingSoft Demo</title>

  <script src="https://cdn.zingchart.com/zingchart.min.js"></script>
</head>

<body>
  <div id="myChart">
    <a class="zc-ref" href="https://www.zingchart.com">Powered by ZingChart</a>
    <button onclick="window.parent.location.reload()">Reload Data</button>
  </div>
</body>

</html>

html,
body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}

#myChart {
  height: 100%;
  width: 100%;
  min-height: 150px;
}

.zc-ref {
  display: none;
}

#myChart button {
  position: absolute;
  top: 15px;
  left: 10px;
  z-index: 1000;
}

// make the AJAX request
var oReq = new XMLHttpRequest();
oReq.addEventListener("load", renderFirstPlotInChart);
oReq.open("GET", "https://zingchart-rest-api.glitch.me/api/data/plot/v1");
oReq.send();

// define chart JSON
var myConfig = {
  type: 'bar',
  title: {
    text: 'Multiple Plots Rendering Asynchronously Using API',
    mediaRules: [{
      maxWidth: 500,
      visible: false
    }]
  },
  plot: {
    // barWidth: 25, // this will prevent users from noticing the barwidth changing
    animation: {}, // add animation to make the chart look alive
  },
  legend: {},
  scaleY: {
    values: '0:300:100' // this will prevent users from noticing the scale repaint
  },
  series: [{
    values: [],
    text: '',
  }]
};

/*
 * callback for GET request is when we will render the chart
 */
function renderFirstPlotInChart() {
  myConfig.series[0].values = JSON.parse(this.responseText);
  myConfig.series[0].text = this.responseURL.slice(-2);
  zingchart.render({
    id: 'myChart',
    data: myConfig,
    height: '100%',
    width: '100%'
  });
}

/*
 * append the plots using ZingChart API method addplot
 * https://www.zingchart.com/docs/api/methods/#zingchart__exec__api__addplot
 */
function addAnotherPlot() {
  zingchart.exec('myChart', 'addplot', {
    data: {
      values: JSON.parse(this.responseText),
      text: this.responseURL.slice(-2)
    }
  });
}
/*
 * Bind plots after the chart has rendered
 */
zingchart.bind('myChart', 'load', function(e) {

  /*
   * make AJAX request for the last two plots
   * Use setTimeouts to show what the effect
   * would look like when using large dataset
   */
  setTimeout(function() {

    // call for second dataset
    oReq = new XMLHttpRequest();
    oReq.addEventListener("load", addAnotherPlot);
    oReq.open("GET", "https://zingchart-rest-api.glitch.me/api/data/plot/v2");
    oReq.send();

    // call for third dataset
    setTimeout(function() {
      oReq = new XMLHttpRequest();
      oReq.addEventListener("load", addAnotherPlot);
      oReq.open("GET", "https://zingchart-rest-api.glitch.me/api/data/plot/v3");
      oReq.send();
    }, 1000);

  }, 2000);
});