disabling right click context menu

<!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;
    }
  </style>
</head>

<body>
  <button onClick="showMenu()">Show Menu</button>
  <div id="myChart"><a class="zc-ref" href="https://www.zingchart.com">Powered by ZingChart</a></div>
  <script>
    ZC.LICENSE = ["569d52cefae586f634c54f86dc99e6a9", "b55b025e438fa8a98e32482b5f768ff5"];
    var myConfig = {
      type: 'bar',
      series: [{
        values: [35, 42, 67, 89, 25, 34, 67, 85]
      }]
    };

    /* return false to stop right click contextmenu */
    zingchart.bind('myChart', 'contextmenu', function(e) {
      return false;
    });

    /* still should trigger the contextmenu */
    window.showMenu = function(e) {
      zingchart.exec('myChart', 'showmenu', {
        x: 10,
        y: 20
      });
    }

    zingchart.render({
      id: 'myChart',
      data: myConfig,
      height: '100%',
      width: '100%'
    });
  </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>
  <button onClick="showMenu()">Show Menu</button>
  <div id="myChart"><a class="zc-ref" href="https://www.zingchart.com">Powered by ZingChart</a></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;
}

var myConfig = {
  type: 'bar',
  series: [{
    values: [35, 42, 67, 89, 25, 34, 67, 85]
  }]
};

/* return false to stop right click contextmenu */
zingchart.bind('myChart', 'contextmenu', function(e) {
  return false;
});

/* still should trigger the contextmenu */
window.showMenu = function(e) {
  zingchart.exec('myChart', 'showmenu', {
    x: 10,
    y: 20
  });
}

zingchart.render({
  id: 'myChart',
  data: myConfig,
  height: '100%',
  width: '100%'
});