D3 Examples - New England Minimum Wage

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<!DOCTYPE html>
<style>
​
  .bar:hover {
    opacity: 0.7;
  }
  .label {
    font-family: Arial;
    font-size: 14pt;
  }
  div.tooltip { 
    position: absolute;         
    text-align: center;         
    width: 100px;                   
    height: 28px;                   
    padding: 2px;               
    font: 12px sans-serif;      
    background: black;  
    border: 0px;        
    border-radius: 8px;         
    pointer-events: none;
    color: white;
}
.axis line {
    fill: none;
    stroke: black;
    shape-rendering: crispEdges;
}
​
.axis text {
    font-family: Arial;
    font-size: 14px;
}
​
</style>
<svg width="500" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
var svg = d3.select("svg"),
    margin = {top: 20, right: 20, bottom: 100, left: 80},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
var x0 = d3.scaleBand()
    .rangeRound([0, width])
    .paddingInner(0.1);
​
var x1 = d3.scaleBand()
    .padding(0.05);
​
var y = d3.scaleLinear()
    .rangeRound([height, 0]);
​
var z = d3.scaleOrdinal()
    .range(["#3B88AD", "#FFA500"]);
​
function round2Fixed(value) {
  value = +value;
​
  if (isNaN(value))
    return NaN;
​
  // Shift
  value = value.toString().split('e');
  value = Math.round(+(value[0] + 'e' + (value[1] ? (+value[1] + 2) : 2)));
​
  // Shift back
  value = value.toString().split('e');
  return (+(value[0] + 'e' + (value[1] ? (+value[1] - 2) : -2))).toFixed(2);
}
  
var yAxisLabelText = "Minimum Hourly Wage ($)";
var yAxisLabelOffset = 35;  
  
var tooltip = d3.select("body").append("div")
    .attr("class", "tooltip")
    .style("opacity", 0);
​
d3.csv("MinimumWage.csv", function(d, i, columns) {
  for (var i = 1, n = columns.length; i < n; ++i) d[columns[i]] = +d[columns[i]];
  return d;
}, function(error, data) {
  if (error) throw error;
​
  var keys = data.columns.slice(1);
​
  x0.domain(data.map(function(d) { return d.State; }));
  x1.domain(keys).rangeRound([0, x0.bandwidth()]);
  y.domain([0, 15]);
​
  var bar = g.selectAll(".bar")
    .data(data)
    .enter().append("g")
    .attr("transform", function(d) { return "translate(" + x0(d.State) + ",0)"; });
  bar.selectAll("rect")
    .data(function(d) { return keys.map(function(key) { return {key: key, value: d[key]}; }); })
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x1(d.key); })
      .attr("y", function(d) { return y(d.value); })
      .attr("width", x1.bandwidth())
      .attr("height", function(d) { return height - y(d.value); })
      .attr("fill", function(d) { return z(d.key); });
  bar
  .on("mouseover", function(d) {
          tooltip.transition()
               .duration(200)
               .style("opacity", .9);
        var elements = document.querySelectorAll(':hover');
        l = elements.length
        l = l-1
        elementData = elements[l].__data__
          tooltip.html(d.State + ":<br/>$" + round2Fixed(elementData.value) + " in " + elementData.key)
               .style("left", (d3.event.pageX + 5) + "px")
               .style("top", (d3.event.pageY - 28) + "px");
      })
      .on("mouseout", function(d) {
          tooltip.transition()
               .duration(500)
               .style("opacity", 0);
      })
  
  g.append("g")
       .attr("transform", "translate(0, "+y(7.25)+")")
       .append("line")
       .attr("x2", width)
       .style("stroke", "Red")
       .style("stroke-width", "2px");       
  
  g.append("g")
      .attr("class", "axis")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x0))
      .selectAll("text")
      .attr("transform", "translate(-12,4), rotate(-45)")
      .style("text-anchor", "end");
​
  g.append("g")
      .attr("class", "axis")
      .call(d3.axisLeft(y).ticks(4))
    .append("text")
      .attr("x", 2)
      .attr("y", y(y.ticks().pop()) + 0.5)
      .attr("dy", "0.32em")
      .attr("fill", "#000")
      .attr("font-weight", "bold")
      .attr("text-anchor", "start");
  
  var yAxisLabel = g.append("text")
        .style("text-anchor", "middle")
        .attr("transform", "translate(-" + yAxisLabelOffset + "," + (height / 2) + ") rotate(-90)")
        .attr("class", "label")
        .text(yAxisLabelText);
​
  var legend = g.append("g")
      .attr("font-family", "sans-serif")
      .attr("font-size", 12)
      .attr("text-anchor", "end")
    .selectAll("g")
    .data(keys.slice().reverse())
    .enter().append("g")
      .attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });
​
  legend.append("rect")
      .attr("x", width - 19)
      .attr("width", 19)
      .attr("height", 19)
      .attr("fill", z);
​
  legend.append("text")
      .attr("x", width - 24)
      .attr("y", 9.5)
      .attr("dy", "0.32em")
      .text(function(d) { return d; });
  
  g.append("rect")
      .attr("x", width - 19)
      .attr("y", 50)
      .attr("width", 19)
      .attr("height", 2)
      .attr("fill", "red");
  
  g.append("text")
       .attr("transform","translate(" + (width-24) + ", 54)")
       .attr("font-family", "sans-serif")
       .attr("font-size", 12)
       .attr("text-anchor", "end")
         .text("Federal Minimum Wage: $7.25");  
  
});
​
</script>
    