D3 Examples - Botanical Barcode (Tess of the d'Urbervilles)

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  font: 1em sans-serif;
}
​
/*.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}*/
​
.bar {
  fill: #00cc00;
}
​
.bar:hover {
  fill: #008f00;
}
​
/*.x.axis path {
  display: none;
}*/
​
.d3-tip {
  line-height: 1;
  word-wrap: break-word;
 /* font-weight: bold;*/
  width: 40%;
  padding: 12px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  border-radius: 2px;
}
​
/* Creates a small triangle extender for the tooltip */
.d3-tip:after {
  box-sizing: border-box;
  display: inline;
  font-size: 1em;
  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;
}
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script>
<script>
​
var margin = {top: 40, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 800 - margin.top - margin.bottom;
​
var tip = d3.tip()
  .attr('class', 'd3-tip')
  .offset([-10, 0])
  .html(function(d) {
    return "<span style='color:white'>" + "\"..." + d.beginContext + "</span><span style='color:yellow'>" + " " + d.word2 + "</span> <span style='color:white'>" + d.endContext +  "...\"" + "<br/>" + "<strong>Frequency: </strong>" + d.word2freq + "</span>";
​
  })
​
var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom);
​
svg.call(tip);
​
d3.json("https://api.myjson.com/bins/1ksi3",  function(error, json) {
​
// var max = d3.max(d3.values(json, function(d){return d.location2;}));
​
​
var max = d3.max(json, function(d) { return Number(d.location2); });
​
console.log(max);
​
  svg.selectAll(".bar")
      .data(json)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return (d.location2/max * 500); })
      .attr("width", 3)
      .attr("y", 150)
      .attr("height", 500)
      .on('mouseover', tip.show)
      .on('mouseout', tip.hide);
​
});
​
​
</script>
    