D3 Examples - circle area plot

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Circles</title>
        <script type="text/javascript" src="https://d3js.org/d3.v4.js"></script>
        <script src="//d3js.org/d3-scale-chromatic.v0.3.min.js"></script>
    </head>
    <body>
        <script type="text/javascript">
​
​
        var h = 800;
        var w = 500;
        var padding = 10;
​
        var data;
        var svg = d3.select("body")
                    .append("svg")
                    .attr("width", w)
                    .attr("height", h);
​
        // load in the coordinates data
        d3.json("coordinate_data.json", function(error, data) {
          // define some scales
          xScale = d3.scaleLinear()
                      .domain([0, d3.max(data, function(d) {
                        return d.x;
                      })])
                      .range([padding, w - padding]);
          yScale = d3.scaleLinear()
                      .domain([0, d3.max(data, function(d) {
                        return d.y;
                      })])
                      .range([padding, h - padding]);
          var colorScale = d3.scaleOrdinal(d3.schemeDark2);
​
          var circles = svg.selectAll("circle")
              .data(data)
              .enter()
              .append("circle")
              .attr("cx", function(d) { return xScale(d.x); })
              .attr("cy", function(d) { return yScale(d.y); })
              .attr("r", 10)
              .attr("fill", "grey");
​
          svg.on("click", function() {
            circles.attr("fill", function(d) {
              return colorScale(d.category)
            })
          })
​
        });
​
​
​
​
        </script>
    </body>
</html>
​
    