D3 Examples - genome browser(testing3)

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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").attr("height",1000);
        
    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;
      })
    
    var rects = svg.selectAll(".genes")
        .data(json)
      .enter()
        .append("rect");
    
    
    
    var tickMarks = {thousand: [], fivehundred: [], onehundred: []};
    
    var genome_positions = [];
        for  (var i = 1; i <= d.genomelength; i++) {genome_positions.push(i);}
    
    genome_positions.forEach(function(currentValue, index, myArray){
      if (currentValue % 1000 === 0) {tickMarks.thousand.push(currenValue);}
      else if (currentValue % 500 === 0) {tickMarks.fivehundred.push(currentValue);}
            else if (currentValue % 100 === 0) {tickMarks.onehundred.push(currentValue);}
    })
    var text= svg.selectAll (".text")
        .data(json)
        .enter()
        .append("text");
      
    var textLabels= text
        .attr("x", function (d) { return ((d.stop+d.start)/10)/2; })
            .attr("y", function (d) { return 90; })
            .attr("y", function (d) {
        if (d.direction==="forward"&& d.name%2!=0) { return 92;} 
                else if (d.direction==="forward" && d.name%2===0){return 62}
                else if (d.direction==="reverse"&& d.name%2 !=0){return 182;}
                else if (d.direction==="reverse"&&d.name%2 ===0){return 152}})
            .text(function (d){return d.name})
            .attr("font-family", "arial")
            .attr("font-size", "20px")
            .attr("text-anchor","middle")
            .attr("fill", "purple");
      
    var rectAttributes = rects
        .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; })
        .style({"fill": function (d) {
                    if (d.direction ==="reverse") {return "silver"} 
                    else if (d.direction === "forward"){ return"gold"}},
                    "stroke":"black", "stroke-width": "2px"})
                .attr("y", function (d) {
                    if (d.direction == "forward") {
                    if (d.name % 2 === 0) {
                    return 70;}
                    else { return 40;}}
                    else if (d.direction == "reverse") {
                    if (d.name % 2 === 0) {
                    return 160;}
                    else { return 130; }}})
                .attr("x", function (d) {
                    if (d.direction === "forward") {
                    return (0 - ((d.stop-d.start)/10)) - 2;}
                    else if (d.direction === "reverse") {
                    return (d.genomelength/10) + 2;}})
                .transition().delay(3000).duration(1000)
                .attr("x", function (d) { return d.start/10; })
                .attr("y", function (d) {
                    if (d.direction==="forward" && d.name%2 !=0) { return 70;}
                    else if (d.direction==="forward" && d.name%2===0){return 40}
                    else if (d.direction==="reverse"&&d.name%2 !=0){return 155;}
                    else if (d.direction==="reverse"&&d.name%2 ===0){return 130}})
                .attr("height", function (d) {return 30;})
    
    var group = svg.selectAll(".a")
      .data(tickMarks.thousand)
      .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)"; });
    group.append("text")
        .text(function (d){return d/1000})
        .attr({x: 3, y: 113, width: "1px", height: 30})
        .attr("transform", function (d) { return "translate(" + d/10 + ",0)"; })
      .attr("font-family", "sans-serif")
      .attr("font-size", "15px")
      .attr("text-anchor","start")
      .attr("fill", "purple"); 
    
    var group2 = svg.selectAll(".b")
      .data(tickMarks.fivehundred)
      .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)"; });
    })})
    </script>
</body>
​
    