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<html>
<head>
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@2.10.3/d3.v2.js"></script>
<title>Drag And Drop</title>
</head>
<body>
<div id="viz"></div>
<script type="text/javascript">
var vizSVG = d3.select("#viz")
.append("svg:svg")
.attr("width", 400)
.attr("height", 300);
vizSVG.append("svg:circle")
.attr("id", "blueCircle")
.attr("cx", 50)
.attr("cy", 140)
.attr("r", 40)
.attr("fill", "blue")
.call(d3.behavior.drag().on("drag", move));
vizSVG.append("svg:circle")
.attr("id", "redCircle")
.attr("cx", 100)
.attr("cy", 140)
.attr("r", 40)
.attr("fill", "red")
.call(d3.behavior.drag().on("drag", move));
function move(){
this.parentNode.appendChild(this);
var dragTarget = d3.select(this);
dragTarget
.attr("cx", function(){return d3.event.dx + parseInt(dragTarget.attr("cx"))})
.attr("cy", function(){return d3.event.dy + parseInt(dragTarget.attr("cy"))});
};
</script>
</body>
</html>
Modified http://mbostock.github.com/d3/d3.js to a secure url
https://mbostock.github.com/d3/d3.js