D3 Examples - Horizontal Bar Chart Sort 2

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<!DOCTYPE html>
<head>
​
  <meta charset="utf-8">
  <link href="https://fonts.googleapis.com/css?family=Josefin+Slab" rel="stylesheet">
  <script src="https://d3js.org/d3.v4.min.js"></script>
​
  <style>
    h1 {
      margin: 0px 0px 15px 20px;
      font-family: 'Josefin Slab', serif;
    }
    .bar {
      fill: steelblue;
    }
    .bar:hover {
      fill: brown;
    }
    .label {
      fill: black;
      font: 10px sans-serif;
    }
    .y path, .y stroke, .y line {
      display: none;
    }
    .x path, .x stroke {
      display: none;
    }
    
    div.tooltip {
      position: absolute;
      text-align: center;
      width: 50px;
      height: 14px;
      padding: 2px;
      font: 12px sans-serif;
      background: lightsteelblue;
      border: 0px;
      border-radius: 8px;
    }
  </style>
​
</head>
<h1>Testing using code I found in Blockbuilder.</h1>
<body>
​
  <script>
    var margin = {
        top: 20,
        right: 20,
        bottom: 30,
        left: 180
      };
    
    var width = 960 - margin.left - margin.right;
    var height = 3528 - margin.top - margin.bottom;
    var svg = d3.select("body").append("svg")
        .attr("width", width + margin.left + margin.right)
        .attr("height", height + margin.top + margin.bottom)
      .append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
    
    var x = d3.scaleLinear()
          .range([0, width]);
    
    var y = d3.scaleBand()
        .range([height, 0]);
    
    var xAxis = d3.axisTop(x)
        .ticks(10);
    
    var yAxis = d3.axisLeft(y);
    
    // Define the div for the tooltip
    var tooltip = d3.select("body").append("div")   
        .attr("class", "tooltip")               
        .style("opacity", 0); 
    
    d3.csv("dat.csv", type, function(error, data) {
      if (error) throw error;
      data.sort(function(a, b) {
        return a.total - b.total;
      });
      
      x.domain([0, d3.max(data, function(d) { return d.total; })]);
      
      y.domain(data.map(function(d) { return d.program; }))
        .paddingInner(0.1);
      
      svg.append("g")
          .attr("class", "x axis")
          .attr("transform", "translate(0," + -2 + ")")
          .call(xAxis);
      
      svg.append("g")
          .attr("class", "y axis")
          .call(yAxis);
      
      svg.selectAll(".bar")
          .data(data)
        .enter().append("rect")
          .attr("class", "bar")
          .attr("x", 0)
          .attr("height", y.bandwidth())
          .attr("y", function(d) { return y(d.program); })
          .attr("width", function(d) { return x(d.total); })
        .on("mouseover", function(d) {
            tooltip.transition()        
                .duration(200)      
                .style("opacity", .9);  
        
                tooltip.html(d.total)   
                .style("left", (d3.event.pageX + 20) + "px")        
                .style("top", (d3.event.pageY - 10) + "px");
            })                  
        .on("mouseout", function(d) {       
            tooltip.transition()        
                .duration(500)      
                .style("opacity", 0)
                });   
    });
    
    function type(d) {
      d.total = +d.total;
      return d;
    }
  </script>
​
</body>
    