D3 Examples - country population barchart (step 3: axes)

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
    
    d3.csv("gapminder_avg.csv", function(data) {
      data.forEach(function(d) {
        
        d.population = +d.population;
        d.lifeexp = +d.lifeexp;
        d.gdp = +d.gdp;
        
      });
​
      var filteredData = data
        .filter(function(d) {return +d.population > 100000000;})
        .sort(function(a,b) {return a.population < b.population;})
      
      var xScale = d3.scaleLinear()
        .domain([0,1000000000])
        .range([0,500]);
        
      // Using data-binding (the d3 way) and store the selection as a variable
​
      var svgElements = svg.selectAll("g")
          .data(filteredData)
        .enter()
          .append("g");
​
      // Add sub elements to each "g" element
​
      svgElements
          .append("text")
          .text(function(d) { return d.country;})
          .attr("y", function(d,i) { return 200+40*i;})
          .attr("x", 100)
          .attr("font-size", 20)
​
      // Add more sub elements to each "g" element
​
      svgElements
          .append("rect")
          .attr("y", function (d,i) {return 176+40*i;})
          .attr("x", 100)
          .attr("width", function (d) {return xScale(d.population);})
          .attr("height",36)
          .attr("opacity",0.2)
      
      var bottomAxis = d3.axisBottom(xScale)
          .ticks(5);
​
      svg.append("g")
          .attr("transform", "translate(100,450)")
          .call(bottomAxis);
​
      svg.append("text")
          .text("population in 1980")
          .attr("transform", "translate(100,440)")
          .attr("font-size",10)
          .attr("font-family","sans-serif")
    });
​
​
​
  </script>
</body>
​
    