D3 Examples - BarChart

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
  <script src= "https://cdnjs.com/libraries/d3-legend"></script>
  <link href='https://fonts.googleapis.com/css?family=Poiret+One' rel='stylesheet' type='text/css'>
<style>
   body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
   svg { width:100%; height:100%;}
     
  .bar {fill: steelblue;}
     
  .bar:hover {fill: red;}
     
  .axis path,
  .axis line {
    fill: black;
    stroke: #000;
    shape-rendering: crispEdges;
  }
​
  .x.axis path {
    display: none;
  }
     
     
  .my-text {
    font-size: 1em;
    font-family: 'Poiret One', cursive;
  } 
  
  
</style>
​
</head>
<body class="my-text">
  <H1>Bar Chart - Visits Data</H1>
  <script>
    var margin = {top: 20, right: 20, bottom: 30, left:80
                 },
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
    
    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")
    .ticks(5);
    
    var svg = d3.select("body").append("svg")
      .attr("width",width+ margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
      .append("g")
      .attr("class","viewport")
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
    
     function render(data){
       
       x.domain(data.map(function(d) { return d.period; }));
       y.domain([0, d3.max(data, function(d) { return d.visits; })]);
     
      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("visits");
       
     svg.selectAll(".bar")
      .data(data)
      .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.period); })
      .attr("width", x.rangeBand())
      .attr("y", function(d) { return y(d.visits); })
      .attr("height", function(d) { return height - y(d.visits); });  
     
     }
    
    function type(d){
        d.visits = +d.visits;
        return d;
    }
    
    d3.csv("visits.csv", type, render);
    
    
  </script>
</body>
​
    