D3 Examples - Alpha Frequencies

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <button id="btn-asc">Sort Ascending</button>
  <button id="btn-desc">Sort Descending</button> 
  <hr />
  <script>
    
    var width = 960;
    var height = 500;
    
    var xScale = d3.scaleLinear()
                        .range([0, width]);
        
      
      var chart = d3.select("body")
                                .append("svg")
                                .attr("width", width)
                                .attr("height", height);
    var dataset;
    
    
    d3.csv("alpha_frequencies.csv", function(error, data) {
      
      dataset = data;
      dataset.forEach(function(d) {
        d.frequency = +d.frequency; // parseFloat(d.frequency)
      });
      dataset.sort(function(a, b) {
        return b.frequency - a.frequency;
      });
      var max_freq = d3.max(dataset, function(d) {
        return d.frequency;
      })
      // Set Domain of the scale
      xScale.domain([0, max_freq]);
​
      
      var rects = chart.selectAll("rect")
                    .data(dataset);
      
      rects.enter()
        .append("rect")
        .attr("width", function(d) { return xScale(d.frequency); })
        .attr("y", function(d, i) { return i * 20})
        .attr("height", 18);
    
      d3.selectAll("#btn-asc")
        .on("click", function(){
        console.log("Clicked")
        dataset.sort(function(a, b) {
          return b.frequency - a.frequency;
        });
        console.log("clicked Asc")
        chart.selectAll("rect")
                .data(dataset)
        .attr("width", function(d) { return xScale(d.frequency); })
        .attr("y", function(d, i) { return i * 20})     });
​
    d3.select("#btn-desc")
        .on("click", function(){
        dataset.sort(function(a, b) {
          return a.frequency - b.frequency;
        });
        console.log("clicked Desc")
        chart.selectAll("rect")
        .data(dataset)
        .attr("width", function(d) { return xScale(d.frequency); })
        .attr("y", function(d, i) { return i * 20})     });
    
    });
​
    
  </script>
</body>
​
    