D3 Examples - Events

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v3.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .red {
      fill: red;
    }
    .blue {
      fill: blue;
    }
    .orange {
      fill: orange;
    }
  </style>
</head>
​
<body>
  <p><a href="https://blockbuilder.org">Blockbuilder</a></p>
  <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", 150)
​
    svg.append("circle")
      .attr("class", "red")
      .attr("cx", 100)
      .attr("cy", 75)
      .attr("r", 20);
    
    svg.append("circle")
      .attr("class", "blue")
      .attr("cx", 200)
      .attr("cy", 75)
      .attr("r", 20);
    
    d3.select("circle.red")
      .on("mouseenter", function (){
        console.log("MOUSEENTER", this)
        })
      .on("mouseleave", function (){
        console.log("MOUSELEAVE", this)
        })
    
    d3.select("circle.blue")
      .on("mousedown", function (){
        console.log("MOUSEDOWN", this)
        })
        // use namespace to register multiple handlers
        // Otherwise the same handler will unregister the previous
      .on("mousedown.second", function (){
        console.log("MOUSEDOWN 2", this)
        });
    
    d3.select("a")
      .on("click", function (){
        d3.event.preventDefault();
        })
        // use namespace to register multiple handlers
        // Otherwise the same handler will unregister the previous
      .on("click.second", function (){
        console.log("CLICKED 2", this);
        });
  </script>
</body>
​
    