D3 Examples - genome browser with tool tip and multi genome

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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>
  <script src="//d3js.org/d3.v3.min.js" language="JavaScript"></script>
  <script src="https://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script>
  
  <style>
    body { 
        margin: ;
        position:fixed;
        top:0;
        right:0;
        bottom:0;
        left:2; 
    }
    /* Tip box */
    .d3-tip {
      line-height: 1;
        font-weight: bold;
      padding: 11px;
      background: rgba(0, 0, 0, 0.8);
      color: #ff0505;
      border-radius: 2px;
    }
        /* This is for the little triangle for the tooltip */
    .d3-tip:after {
      box-sizing: border-box;
      display: inline;
      font-size: 10px;
      width: 100%;
      line-height: 1;
      color: rgba(0, 0, 0, 0.8);
      content: "\25BC";
      position: absolute;
      text-align: center;
    }
    /* Style northward tooltips differently */
    .d3-tip.n:after {
      margin: -1px 0 0 0;
      top: 100%;
      left: 0;
    }
    /* Lower tip box */
    .d3-hidden {
      line-height: 1;
        font-weight: bold;
      padding: 11px;
      background: rgba(1, 34, 34, 0.8);
      color: #1fe429;
      border-radius: 2px;
    }
        /* This is for the little triangle for the tooltip */
    .d3-hidden:after {
      box-sizing: border-box;
      display: inline;
      font-size: 20px;
      width: 100%;
      line-height: 1;
      color: rgba(1, 0, 0, 0.8);
      content: "\25BC";
      position: absolute;
      text-align: center;
    }
    /* Style northward tooltips differently */
    .d3-hidden.n:after {
      margin: -60px 0 0 0;
      top: 100%;
      left: 0;
    }
    a {
      cursor: pointer;
      text-decoration: underline;
      color: black;
    }
    #download {
      border: 1px solid silver;
      position: absolute;
      opacity: 0;
    }
  </style>
</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 sequences = svg.selectAll(".genomes")
        .data(json)
        .enter()
        .append("g");
      sequences.attr("transform", function(d, i) { 
        return "translate(0," + (10 + (i*225)) + ")"; 
      });
      
      //starting the ruler
      sequences.append("rect")
        .attr({x: -500, y: 100, width: function(d) { 
          return d.genomelength/10; }, height: 30
              })
        .style({"stroke-width": "2px", "fill": "white", "stroke": "black"})
        .attr("stroke-opacity", 0)
        .transition(1000).duration(1000)
        .attr({x: 0})
        .attr("stroke-opacity", 1);
      
      //grouping the 3 tick groups and displaying them
        var group = sequences.selectAll(".a")
        .data(function (d) {
          ticks = [];
          genome_positions = d3.range(d.genomelength);
          genome_positions.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})
        .attr({x: function (d) { return d/10; }, y: 100, width: "1px", height: 30})
            .transition().duration(3000)
        .attr("transform", function (d) { return "translate(" + d/10 + ",0)"; });
    //numbers @1000 ticks
    group.append("text")
        .attr("y", 112)
        .attr("x", function(d) {
        return (d/10) + 1
      })
        .style({"font-size":"20px","fill":"red"})
        .transition().duration(2000).delay(2000)
        .style({"font-family":"verdana","font-size":"10px","fill":"green"})
      .text(function(d,i) {
            return i;
    })
        var group2 = sequences.selectAll(".b")
      .data(function(d) {
        ticks = [];
        genome_positions = d3.range(d.genomelength);
        genome_positions.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})
        .attr({x: function(d) {return d/10;}, y: 100, width: "1px", height: 15})
      .transition().duration(3000)
      .attr("transform", function (d) {
        return "translate(" + d/10 + ",0)";
        });
        var group3 = sequences.selectAll(".onehundredticks")
      .data(function(d) {
        ticks = [];
        genome_positions = d3.range(d.genomelength);
        genome_positions.forEach(function (currentValue, index, myArray) {
          if (currentValue % 100 === 0 & currentValue % 500 !== 0 
              & currentValue % 1000 !== 0) {
            ticks.push(currentValue);
          }
        });
        return ticks;
      })
      .enter()
        .append("g");
    group3.append("rect")
        .style({"fill": "black"})
      //.attr({x: 0, y: 115, width: "1px", height: 15})
        .attr({x: function (d) { return d/10; }, y: 115, width: "1px", height: 15})
      .transition().duration(3000)
      .attr("transform", function (d) { 
        return "translate(" + d/10 + ",0)"; 
        });
    
      var genes = sequences.selectAll(".genes")
        .data(function(d) { return d.genes;})
          .enter()
        .append("g");
        
      //Hover box when you mouseover genes
      var tip = d3.tip()
      .attr('class', 'd3-tip')
      .offset(function (d) {
        if (d.direction == "forward") {
            return [-20, -8];
        }
        else if (d.direction == "reverse") {
            return [-20, -8];
        }
      })
      .html(function(d) {
        return "<b>Product:</b> <span style='color:white'>" 
          + d.product + "</span>";
      })
      //Clickable tip box attr
      var hidden = d3.tip()
        .attr('class', 'd3-hidden')
        .offset(function (d) {
        if (d.direction == "forward") {
            return [80, -8];
            }
        else if (d.direction == "reverse") {
            return [80, -8];
        }
      })
      .html(function(d) {
        return "<a style=color:white target=_blank href=https://blast.ncbi.nlm.nih.gov/Blast.cgi>BLAST:</a><span style='color:white'>" 
          + " " + d.translation + "</span>";
      })
        //call the "tool-tips"
      svg.call(tip);
      svg.call(hidden);
      
         //add in gene boxes with transistion
         genes.append("rect")
        .on('mouseover', tip.show).on('mouseout', tip.hide)
        .on('click', hidden.show).on('dblclick', hidden.hide)
        .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;
          }
        })
          .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 === "forward") {
            return "009900";
          }
          else if   (d.direction === "reverse"){
            return "FF6600";
          }
          else  {
            return "yellow";
          }
        })
        .style({"stroke":"black", "stroke-width":"2px"})
            .transition().delay(2000).duration(2000)
            .attr("x", function (d) { 
          return d.start/10; 
        })
          .attr("y", function (d) { 
          if (d.direction == "forward" && d.name%2==0) {
          return 34; 
          }
          else if (d.direction == "forward" && d.name%2!==0) {
            return 67; 
          }
          else if (d.direction == "reverse" && d.name%2==0) {
            return 133;
          }
          else if (d.direction == "reverse" && d.name%2!==0) {
            return 165;
          }
          else  {
            return 60;
          }
        })
        .attr("height", function (d) {return 30;})
        group.on("click", function() {
            console.log("rect");
        })
        //text in gene boxes
      genes.append("text") 
        .attr("x", function (d) { return ((d.start+d.stop)/10)/2})
        .style("text-anchor","middle")
        .style({"font-family":"verdana","font-size":"18px","fill":"white"})
        .attr("y", function (d) { 
          if (d.direction === "forward" && d.name%2==0) {
            return 58;
          }
          else if (d.direction === "forward" && d.name%2!==0) {
            return 91;
          }
          else if (d.direction === "reverse" && d.name%2==0) {
            return 151;
          }
          else if (d.direction === "reverse" && d.name%2!==0) {
            return 185;
          }
          else {
            return 80;
            }
        })
        .text(function (d) {
            return d.name;})
          //var c = 0;
          //var g = 0;
          //for (var i=0; i<=d.sequence.length; i++) {
           // if (d.sequence[i] === "C") {c++; }
           // else if (d.sequence[i] === "G") {g++;}
          //}
         // return (((c+g)/d.sequence.length)*100);})
        //.attr("fill-opacity",0)
        //.transition().duration(3000).delay(2000)
        //.attr("fill-opacity",1);
​
      // text above or below boxes
      genes.append("text") 
        .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 28;
            }
            else { return 59;}
          }
          else if (d.direction == "reverse") {
            if (d.name % 2 === 0) {
              return 181;
            }
              else { return 213;}
          }
        })
        .style({"text-anchor":"middle","fill":"black","font-weight":"bold"})
        .attr("font-family","sans-serif")
        .text(function(d) {return d.subnum})
        .attr("fill-opacity", 0)
        .transition().delay(4500).duration(1000)
        .attr("fill-opacity", 1);
       
 });
  </script>
  
</body>
​
    