D3 Examples - Bar Chart - Tornadic Activity

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  font: 10px sans-serif;
}
​
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
.bar {
  fill: steelblue;
}
​
.bar text   {
    color: #000000;
}
​
.x.axis path {
  display: none;
}
​
div.tooltip {   
  position: absolute;           
  text-align: left;                 
  padding: 2px;           
  font: 12px sans-serif;        
  background: #EDEDED;   
  border: 0px;      
  border-radius: 8px;           
  pointer-events: none;         
}
​
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
​
var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
    
var div = d3.select("body").append("div").attr("class", "tooltip").style("opacity", 0);
​
var x = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1);
​
var y = d3.scale.linear()
    .range([height, 0]);
​
var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");
​
var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");
​
var svg = d3.select("body").append("svg")
    .attr("class", "chart")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
d3.csv("tornado90-13.csv", function(error, data) {
​
  data.forEach(function(d) {
    d.total = +d.total
    d.year = +d.year;
  });
​
  x.domain(data.map(function(d) { return d.year; }));
  y.domain([0, d3.max(data, function(d) { return d.total; })]);
​
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);
​
  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Tornado count");
​
  svg.selectAll(".bar")
      .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.year); })
      .attr("width", x.rangeBand())
      .attr("y", function(d) { return y(d.total); })
      .attr("height", function(d) { return height - y(d.total); })
      .on("mouseover", function (d) {
                div.transition()
                .duration(1000)
                .style("opacity", .9);
                div.html(
                    "<table>"
                    +"<tr><th>Year</th> <th>Total</th></tr>" 
                    + "<tr><td>" + d.year + ":</td><td>" + d.total + "</td></tr>"    
                    + "</table>")
                .style("left", (d3.event.pageX) + "px")
                .style("top", (d3.event.pageY-20) + "px")
            })
            .on("mouseout", function (d){
                div.transition()
                .duration(500)
                .style("opacity", 0);
            });
    
});
​
</script>
    