D3 Examples - interactive line chart

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .line {
      fill: none;
      stroke: black;
      stroke-width: 1.5px;
    }
  </style>
</head>
​
<body>
  <script>
    // Margin setup
    var margin = {top: 20, right: 30, bottom: 20, left: 100},
        width = 760 - margin.left - margin.right,
        height = 300 - margin.top - margin.bottom;
        
    // Basic SVG canvas
    var svg = d3.select("body").append("svg")
        .attr("width", width + margin.left + margin.right)
        .attr("height", height + margin.top + margin.bottom)
      .append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
    // https://bl.ocks.org/zanarmstrong/raw/05c1e95bf7aa16c4768e/
    var parseDate = d3.timeParse("%b-%Y");
    var displayDate = d3.timeFormat("%b %y");
    var displayValue = d3.format(",.0f");
            
    // Temporal scale
    var x = d3.scaleTime()
        .range([0, width]);
​
        // Linear scale
    var y = d3.scaleLinear()
        .range([height, height - 200]);
​
    var line = d3.line()
        .x(function(d) { return x(d.date); })
        .y(function(d) { return y(d.value); });
    
    var g = svg.append("g")
        .attr("transform", "translate(10, 0)");
    
    d3.text("https://gist.githubusercontent.com/mbostock/1256572/raw/44c086a6019de56dce35a47197a19468b3e4ad57/stocks.csv", function(data) {
​
      var dsv = d3.dsvFormat()
      var data = dsv.parse(raw())
          
      // Pre-processing
      // {"id" : 1, "name": "A", "value": 10, "date": "2016-01"}
      data.forEach(function(d) {
        d["date"] = parseDate(d.date);
        d.price=parseInt(d.price);
      });
      
      var nested_data=d3.nest()
         .key(function(d) { return d.symbol;})
         .rollup(function(leaves){
           return d3.sum(leaves,function(d){
             return d.price;
           });
           
         })
      .entries(data);
      
      console.log(nested_data)
      
      x.domain(d3.extent(data, function(d) { return d.date; }));
            y.domain([0, d3.max(data, function(d) { return d.price; })]);
​
      g.selectAll(".line").data(nested_data).enter()
         .append("path")
         .attr("class","line")
      .attr("d",function(d) { return line(d.values);});
      
      g.selectAll(".label").data(nested_data).enter()
         .append("text")
         .attr("class","label")
         .attr("transform", function(d,i) {
        return "translate(50," + (i*20 +30) + ")";
      })
    });
​
  </script>
</body>
​
    