examples/decimal-custom-hover.html

<!doctype html>
<head>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/raphael/2.1.2/raphael-min.js"></script>
  <script src="../morris.js"></script>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/prettify/r224/prettify.min.js"></script>
  <script src="lib/example.js"></script>
  <link rel="stylesheet" href="lib/example.css">
  <link rel="stylesheet" href="http://cdnjs.cloudflare.com/ajax/libs/prettify/r224/prettify.min.css">
  <link rel="stylesheet" href="../morris.css">
</head>
<body>
<h1>Decimal Data</h1>
<div id="graph"></div>
<pre id="code" class="prettyprint linenums">
var decimal_data = [];
for (var x = 0; x <= 360; x += 10) {
  decimal_data.push({
    x: x,
    y: 1.5 + 1.5 * Math.sin(Math.PI * x / 180).toFixed(4)
  });
}
window.m = Morris.Line({
  element: 'graph',
  data: decimal_data,
  xkey: 'x',
  ykeys: ['y'],
  labels: ['sin(x)'],
  parseTime: false,
  hoverCallback: function (index, options, default_content, row) {
    return default_content.replace("sin(x)", "1.5 + 1.5 sin(" + row.x + ")");
  },
  xLabelMargin: 10,
  integerYLabels: true
});
</pre>
</body>