cs 724 final chart

<!DOCTYPE html>
<meta charset="utf-8">
<head>
<h2>Does a great defense make a superbowl winning quarterback appear greater then they are?</h2>
<style>

.rectangle {
	fill: blue;
}

.rectangle:hover {
	fill: orange;
}
.axis {
  font: 14px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
</style>
</head>
<body>
<div id="drop" align=center></div>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>

var margin = {top: 50, right: 45, bottom: 95, left: 45},
    width = 1000 - margin.left - margin.right,
    height = 475 - 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 + ")");

d3.tsv("mergedqb.txt", function(error, data){

// Get every column value
	var elements = Object.keys(data[0])
		.filter(function(d){
			return ((d != "SuperBowlWinningQb") & (d != "SuperBowlD")&(d !="Year") );});
	var selection = elements[0];

var xAxis = d3.svg.axis()
		.scale(x)
	    .orient("bottom");

var yAxis = d3.svg.axis()
		.scale(y1)
	    .orient("left");

svg.append("g")
    	.attr("class", "x axis")
    	.attr("transform", "translate(0," + height + ")")
    	.call(xAxis)
    	.selectAll("text")
    	.style("font-size", "10px")
      	.style("text-anchor", "end")
      	.attr("dx", "-0.920000000000002em")
      	.attr("dy", "-.60em")
      	.attr("transform", "rotate(-90)" );

svg.append("g")
    	.attr("class", "y axis")
    	.call(yAxis);

svg.selectAll("rectangle")
		.data(data)
		.enter()
		.append("rect")
		.attr("class","rectangle")
		.attr("width", width/data.length)
		.attr("height", function(d){
			return height+2 - y1(+d[selection]);
		})
		.attr("x", function(d, i){
			return (width / data.length) * i ;
		})

.attr("y", function(d){
			return y1(+d[selection]);
		})
		.append("title")
		.text(function(d){
           			return d.Year+ " "+  d.SuperBowlWinningQb+" "+ d[selection];
		});

var selector = d3.select("#drop")
    	.append("select")
    	.attr("id","dropdown")
    	.on("change", function(d){
        	selection = document.getElementById("dropdown");
					if (this.value === "RegularSeasonQbRating"){
        	y1.domain([0, d3.max(data, function(d){
				return +d[selection.value];})]);

yAxis.scale(y1);
					
        	d3.selectAll(".rectangle")
           		.transition()
	            .attr("height", function(d){
					return height - y1(+d[selection.value]);
				})
				.attr("x", function(d, i){
					return (width / data.length) * i ;
				})
				.attr("y", function(d){
					return y1(+d[selection.value]);
				})
         .style("fill", function(d) {  if (d.QBRank == "1")  {return "red"}
                                else if (d.QBRank =="2")  {return "red"}
                                else if (d.QBRank =="3") {return "red"} 
                                else if (d.QBRank =="4") {return "red"}  
                                else if (d.QBRank =="5") {return "red"}})
           		.ease("linear")
           		.select("title")
           		.text(function(d){
           			return d.Year+ " "+ d.SuperBowlWinningQb+ " "+ d[selection.value];
           		});
      
           	d3.selectAll("g.y.axis")
           		.transition()
           		.call(yAxis);}
          else if(this.value === "QBRank"){
        	y.domain([1, d3.max(data, function(d){
				return +d[selection.value];})]);

yAxis.scale(y);
					
        	d3.selectAll(".rectangle")
           		.transition()
	            .attr("height", function(d){
					return height - y(+d[selection.value]);
				})
				.attr("x", function(d, i){
					return (width / data.length) * i ;
				})
				.attr("y", function(d){
					return y(+d[selection.value]);
				})
          .style("fill", function(d) {   
															 if (d.QBRank =="1") {return "red"}  
                                else if (d.QBRank =="2") {return "red"} 
                                else if (d.QBRank =="3") {return "red"} 
                                else if (d.QBRank =="4") {return "red"} 
                                else if (d.QBRank =="5") {return "red"}})
           		.ease("linear")
           		.select("title")
           		.text(function(d){
                {return d.Year+ " "+ d.SuperBowlWinningQb+ " "+ d[selection.value];}
          		});
      
           	d3.selectAll("g.y.axis")
           		.transition()
           		.call(yAxis);}
      		else {
        	y.domain([0, d3.max(data, function(d){
				return +d[selection.value];})]);

yAxis.scale(y);
					
        	d3.selectAll(".rectangle")
           		.transition()
	            .attr("height", function(d){
					return height - y(+d[selection.value]);
				})
				.attr("x", function(d, i){
					return (width / data.length) * i ;
				})
				.attr("y", function(d){
					return y(+d[selection.value]);
				})
         .style("fill", function(d) {  if (d.DRank == "1")  {return "red"}
                                else if (d.DRank =="2")  {return "red"}
                                else if (d.DRank =="3") {return "red"} 
                                else if (d.DRank =="4") {return "red"}  
                                else if (d.DRank =="5") {return "red"}})
           		.ease("linear")
           		.select("title")
           		.text(function(d){
           			return d.Year+ " "+ d.SuperBowlD+ " "+ d[selection.value];
           		});
  svg.append("text")
  	.attr("class", "label")
    .attr("x", 175-margin.left)       // set x position of label
    .attr("y", 16-margin.top/2)
    .style("text-anchor", "middle")
  	.text ("18 Defenses ranked in the top 5 vs only 4 Quarterbacks")
    .style('fill', "Black")
           	d3.selectAll("g.y.axis")
           		.transition()
           		.call(yAxis);}});

selector.selectAll("option")
      .data(elements)
      .enter().append("option")
      .attr("value", function(d){
        return d;
      })
      .text(function(d){
        return d;
      })
   
//input color legend to chart
  // y-axis label
  svg.append("text")
  	.attr("class", "label")
    .attr("x", 65-margin.left)       // set x position of label
    .attr("y", 0-margin.top/2)			// set y position of label
    .style("text-anchor", "start")  // left-justify
  	.text ("= Ranked in the Top 5")
    .style('fill', "Black")

svg.append("text")
  	.attr("class", "label")
    .attr("x", 0-margin.left)       // set x position of label
    .attr("y", 0-margin.top/2)			// set y position of label
    .style("text-anchor", "start")  // left-justify
  	.text ("Red Bars")
    .style('fill', "Red")
});

</script>
</body>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js