D3 Examples - Number of Public Bicycle Hires

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  font: 10px sans-serif;
}
​
.bar {
  fill: #003687;
}
​
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
.x.axis path {
  display: none;
}
​
</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script>
​
var margin = {top: 20, right: 20, bottom: 40, left: 30},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
var parseDate = d3.time.format("%d/%m/%Y").parse,
    nformat = d3.format('s'),
    dateFormat = d3.time.format("%d/%m");
​
var x = d3.scale.ordinal()
    .rangeRoundBands([0, width],.1);
​
var y = d3.scale.linear()
    .range([height, 0]);
​
var xAxis = d3.svg.axis()
    .scale(x)
    .tickFormat(dateFormat)
    .orient("bottom");
​
var yAxis = d3.svg.axis()
    .scale(y)
    .tickFormat(nformat)
    .orient("left");
​
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.csv("data.csv", function(error, data) {
  if (error) throw error;
​
  data.forEach(function(d) {
    d.date = parseDate(d.date);
    d.cycles = +d.cycles;
  });
  var max = d3.max(data, function(d) { return d.cycles; });
  x.domain(data.map(function(d) { return d.date; }));
  y.domain([0,max]);
​
  svg.selectAll(".bar")
      .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.date); })
      .attr("width", x.rangeBand())
      .attr("y", function(d) { return y(d.cycles); })
      .attr("height", function(d) { return height - y(d.cycles); });
​
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)
    .selectAll("text")
      .attr("y", 0)
      .attr("x", 9)
      .attr("dy", ".35em")
      .attr("transform", "rotate(90)")
      .style("text-anchor", "start");
​
  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("font-weight", "bold")
      .style("text-anchor", "end")
      .text("Number of Bicycle Hires");
​
  var extremum = data.filter( function(d) { return d.cycles===max; })[0];
​
  var legend = svg.append("g")
      .attr("class", "legend")
      .attr("transform", "translate(" + (x(extremum.date)+ x.rangeBand()/2) + ",70)")
      .style("fill","#e32118");
  
  legend.append("circle")
      .attr("r",4);
​
  legend.append("line")
      .attr("x1",0)
      .attr("y1",0)
      .attr("x2",70)
      .attr("y2",0)
      .style("stroke","#e32118")
      .style("stroke-width","2px");
​
  legend.append("text")
      .attr("x",75)
      .attr("y",4)
      .style("font-size","12px")
      .text("09/07 TFL Tube Strike");
​
});
​
</script>
​
    