D3 Examples - wine quality test 4

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
</head>
​
<body>
  
  dataset
  <select onchange="loadData()" id="dataset">
    <option>red_wine</option>
    <option>white_wine</option>
  </select>
  
  <script>
    var f = document.getElementById("dataset").selectedOptions[0].text;
    var dataFile = f + ".csv";
    var headerNames =[];
    d3.csv(dataFile, function(d) {
            headerNames=Object.keys(d);
        });
    var svg = d3.select('body').append('svg')
              .attr('height', '1100')
              .attr('width', '600');
    svg.append("text")
    .attr("x",100)
    .attr("y", 100)
    .text(headerNames.length);
  </script>
</body>
    