D3 Examples - slider time test

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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; }
    .track,
    .track-inset,
    .track-overlay {
      stroke-linecap: round;
    }
​
    .track {
      stroke: #000;
      stroke-opacity: 0.3;
      stroke-width: 10px;
    }
​
    .track-inset {
      stroke: #ddd;
      stroke-width: 8px;
    }
​
    .track-overlay {
      pointer-events: stroke;
      stroke-width: 50px;
      stroke: transparent;
      cursor: crosshair;
    }
​
    .meanSliderHandle {
      fill: #fff;
      stroke: #000;
      stroke-opacity: 0.5;
      stroke-width: 1.25px;
    }  
  </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);
    
    var data = [1, 2, 3, 4, 5];
    
    function update(numCircles) {
      data = [];
      for (var i = 0; i < numCircles; i++){
        data.push(i);
      }
      
      var circles = svg.selectAll("circle")
        .data(data);
      circles.enter()
        .append("circle")
        .attr("cy", 60)
        .attr("cx", function(d, i) {return i*100 + 30;})
        .attr("r", function(d) {return d*d;});
      circles.exit().remove();
    }
    
    var sliderScale = d3.scaleLinear()
    .range([0,159])
    .domain([1, 10])
    .clamp(true);
    
    var slider = svg.append("g")
      .attr("class", "slider")
      .attr("transform", "translate(" + 50 + "," + 200 + ")");
    
    slider.append("line")
      .attr("class", "track")
      .attr("x1", 0)
      .attr("x2", 159)
    .select(function() { return this.parentNode.appendChild(this.cloneNode(true)); })
      .attr("class", "track-inset")
    .select(function() { return this.parentNode.appendChild(this.cloneNode(true)); })
      .attr("class", "track-overlay")
      .call(d3.drag()
          .on("start.interrupt", function() { slider.interrupt(); })
          .on("start drag", function() { 
                var numCircles = sliderScale.invert(d3.event.x);
            sliderHandle.attr("cx", sliderScale(numCircles));
            update(numCircles);
          }));
    
    var sliderHandle = slider.insert("circle", ".track-overlay")
      .attr("class", "sliderHandle")
      .attr("r", 9)
      .attr("cx", sliderScale(1)); 
    
    update(5);
    
    
    
​
  </script>
</body>
​
    