D3 Examples - genome browser 4 with numbers

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
</head>
<body>
  <script>
    var svg = d3.select("body").append("svg");
    d3.json("genes.json.txt", function(error, json) {
          if (error) return console.warn(error);
      svg.attr("width", function (d) {
        return d3.max(json, function (d) {
          return d.genomelength/10;
        })
      })
      .attr("height", 2000);
      
            var genomes = svg.selectAll(".genomes")
        .data(json)
          .enter()
        .append ("g");
      genomes.attr("transform", function(d, i){ return "translate(0," + ( (i*225)) + ")"});
      
    genomes.append("rect") //background for ruler
      .attr({x: 0, y: 100, width: function (d) {return d.genomelength/10}, height: 30})
        .style({"stroke-width": "2px", "fill": "white", "stroke": "black"});
      
      var genes = genomes.selectAll(".genes")
        .data(function(d) { return d.genes; })
          .enter()
        .append ("g");
      
      genes.append("rect") // gene boxes
        .attr("x", function (d) { return d.start/10; })
          .attr("y", function (d) { return 100; })
        .attr("height", function(d) { return 0;})
        .attr("width", function (d) { return (d.stop-d.start)/10; })
        .attr("style", function (d) { return (d.dirction)})
        .style ("fill", function (d) {
            if (d.direction === "forward") { 
              return "turquoise";
            }
            else if (d.direction === "reverse") { 
              return "lightpink";
            }
                else {
              return "black";
            }
        })
 
        .attr("y", function (d) {
        if (d.direction === "forward") {
          if (d.name%2 === 0)
            return 60;
          else {
            return 40;
          }
        }
        else {
          if (d.name%2 === 0)
            return 140;
          else {
            return 170;
          }
        }
      })
                .attr("x", function (d) {
            if (d.direction === "forward") {
            return (0 - ((d.stop-d.start)/10)) - 2;
          }
            else if (d.direction === "reverse") {
            w = d3.select("svg").style("width");
            return w;
          }
      })
      .style ("stroke", function (d) {
            if (d.direction === "forward") { 
              return "lightseagreen";
            }
            else if (d.direction === "reverse") { 
              return "hotpink";
            }
                else {
              return "black";
            }
        })
        .style ({"stroke-width": "2px"})
            .transition().delay(3000).duration(1000)
        .attr("height", function (d) {
                return 30;
        })
        .attr("x", function (d) { 
                return d.start/10; 
      })
​
      ;
                
      
      genes.append("text") // gene name
        .attr("x", function (d) { 
                return ((d.stop+d.start)/2)/10; 
        })
          .attr("y", function (d) { 
        if (d.direction === "forward") {
          if (d.name%2 === 0)
            return 80;
            else {
            return 60;
        }
        }
        else {
          if (d.name%2 === 0)
            return 160;
          else {
            return 190;
          }
        }
      })
        .transition().delay(4000).duration(1000)
        .text ( function (d) { return d.name; })
            .style({"text-anchor": "middle", "font-family": "ariel", "font-weight": "bold"})
        .style ("fill", function(d) {
        if (d.direction === "forward") {
          return "black";
        }
        else {
          return "black";
        }
      });
      
      genes.append("text") // pham name
        .attr("x", function(d) { 
        return ((d.start + d.stop)/2)/10;
        })
        .attr("y", function (d) {
      if (d.direction == "forward") {
        if (d.name % 2 === 0) {
            return 50;
        }
        else { 
          return 30;
        }
      }
            else if (d.direction == "reverse") {
        if (d.name % 2 === 0) {
            return 190;
        }
            else { 
            return 220;}
      }
    })
    
    .style({"text-anchor": "middle", "fill": "black", "font-family": "ariel", "font-weight": "bold"})
    .text(function(d) {
      return d.pham
    })
    .attr("fill-opacity", 0)
    .transition().delay(3500).duration(1500)
        .attr("fill-opacity", 1);
    
            
    var group = genomes.selectAll(".a") // tickmarks
      .data(function (d) {
        ticks = [];
        genome_position = d3.range(d.genomelength);
        genome_position.forEach(function (currentValue, index, myArray) {
          if(currentValue % 1000 === 0) {
            ticks.push(currentValue);
          }
        });
        return ticks;
      })
      .enter()
        .append("g");
    group.append("rect")
        .style({"fill": "black"})
      .attr({x: 0, y: 100, width: "1px", height: 30})
            .transition().duration(3000)
        .attr("transform", function (d) { return "translate(" + d/10 + ",0)"; });
        var group2 = genomes.selectAll(".b")
      .data(function (d) {
        ticks = [];
        genome_position = d3.range(d.genomelength);
        genome_position.forEach(function (currentValue, index, myArray) {
          if(currentValue % 500 === 0) {
            ticks.push(currentValue);
          }
        });
        return ticks;
      })
      .enter()
        .append("g");
    group2.append("rect")
        .style({"fill": "black"})
      .attr({x: 0, y: 100, width: "1px", height: 15})
        .transition().duration(2000)
      .attr("transform", function (d) { return "translate(" + d/10 + ",0)"; });
        var group3 = genomes.selectAll(".c")
      .data(function (d) {
        ticks = [];
        genome_position = d3.range(d.genomelength);
        genome_position.forEach(function (currentValue, index, myArray) {
          if(currentValue % 100 === 0 & currentValue % 1000 !== 0 & currentValue % 500 !== 0) {
            ticks.push(currentValue);
          }
        });
        return ticks;
      })
      .enter()
        .append("g");
    group3.append("rect")  
        .style({"fill": "black"})
      .attr({x: 0, y: 115, width: "1px", height: 15})
        .transition().duration(1000)
      .attr("transform", function (d) { return "translate(" + d/10 + ",0)"; })
    group.append("text")
        .text(function (d,i) {
            return i;
    })
      .attr({y: 115, width: "1px", height: 15})
        .attr("x", function(d) {return (d/10)+2;})
        .attr({"font-size": "10px", "fill":"grey"});
    });
    
  </script>
</body>
​
    