D3 Examples - [basic shapes] clickable circle

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="https://d3js.org/d3-selection-multi.v1.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    var svg = d3.select("body").append("svg")
      .attrs({"width": 960,
                  "height": 500,
              "bgcolor": "black"})
​
    var ball = svg.append("circle")
        .attrs({  // provided by selection-multi module
          "r": 73,
          "cx": 480,
          "cy": 250
          })
        .style("fill", "#ffe41e");
    
    var changeColor = function() {
      if (ball.green) {
        ball.style("fill", "#ffe41e");
        ball.green = false;
      } else {
        ball.green = true;
        ball.style("fill", "green");
      }
    }
    
    ball.on("click", changeColor);
    
  </script>
</body>
​
    