D3 Examples - Bar Maryland Counties

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<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */
​
body {
  margin:0;
  position:fixed;
  top:0;
  right:0;
  bottom:0;
  left:0;
}
​
.bar { 
  fill: steelblue;
}
​
.bar:hover {
  fill: brown;
}
​
.label {
  fill: black;
  font: 10px sans-serif;
  text-anchor: middle;
}
</style>
<body>
    
<!-- load the d3.js library -->     
<script src="//d3js.org/d3.v4.min.js"></script>
​
<script>
// set the dimensions and margins of the graph
var margin = {top: 20, right: 20, bottom: 80, left: 80}, // 1. Adjust margin to make room for axis labels
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
// set the ranges
var x = d3.scaleBand()
          .range([0, width])
          .padding(0.05);
​
var y = d3.scaleLinear()
          .range([height, 0]);
​
var xAxis = d3.axisBottom(x);
var yAxis = d3.axisLeft(y)
        .ticks(10, "%");
          
// append the svg object to the body of the page
// append a 'group' element to 'svg'
// moves the 'group' element to the top left margin
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 + ")");
​
// get the data
var url = "https://raw.githubusercontent.com/MTClass/Project/master/CountyPop.csv"
  
d3.csv(url, function(error, data) {
  if (error) throw error;
​
  // format the data
  data.forEach(function(d) {
    d.Pop = +d.Pop;
  });
​
  // Scale the range of the data in the domains
  x.domain(data.map(function(d) { return d.County; }));
  y.domain([0, d3.max(data, function(d) { return d.Pop; })]);
​
  // append the rectangles for the bar chart
  svg.selectAll(".bar")
      .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.County); })
      .attr("width", x.bandwidth())
      .attr("y", function(d) { return y(d.Pop); })
      .attr("height", function(d) { return height - y(d.Pop); });
​
  // add the x Axis
  svg.append("g")
      .attr("class", "x axis")  // 2. Add a class so we can select X-axis to customize text
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));
​
  // 3. Custom text formatting on the X-Axis
  d3.selectAll(".x.axis .tick text")
      .attr("text-anchor", "start")
      .attr("transform", "rotate(15)");
  
  // add the y Axis
  svg.append("g")
      .call(d3.axisLeft(y));
  
  // NEW: Title
svg.append('text')
    .attr('x', width / 4)
    .attr('y', "1em")
    .style('font-size', '1.5em')
    .style('text-anchor', 'middle')
    .text('Maryland Population by Counties')
​
// NEW: Source
svg.append('text')
    .attr('x', width / 5)
    .attr('y', "30em")
    .style('font-size', '1em')
    .style('text-anchor', 'middle')
    .text('Source : ACS 2011-2015')
​
});
</script>
</body>
    