HELP CENTER center scale label click

<!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>
  <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',
      scaleY: {
        label: {
          text: 'Expenses',
          flat: false,
          cursor: 'pointer'
        }
      },
      scaleX: {
        label: {
          text: 'Hour',
          flat: false,
          cursor: 'pointer'
        }
      },
      series: [{
        values: [35, 42, 67, 89, 25, 34, 67, 85]
      }]
    };

    zingchart.bind(null, 'label_click', function(e) {
      if (e.labelid === 'si_title') {
        if (e.scale === 'scale-x') {
          window.alert('scale-x clicked');
        } else {
          window.alert('scale-y clicked');
        }

      }
    });

    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>
  <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',
  scaleY: {
    label: {
      text: 'Expenses',
      flat: false,
      cursor: 'pointer'
    }
  },
  scaleX: {
    label: {
      text: 'Hour',
      flat: false,
      cursor: 'pointer'
    }
  },
  series: [{
    values: [35, 42, 67, 89, 25, 34, 67, 85]
  }]
};

zingchart.bind(null, 'label_click', function(e) {
  if (e.labelid === 'si_title') {
    if (e.scale === 'scale-x') {
      window.alert('scale-x clicked');
    } else {
      window.alert('scale-y clicked');
    }

  }
});

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