D3 Examples - simple line chart from dataset

xxxxxxxxxx
 
<!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; }
    .line {
      fill: none;
      stroke: black;
      stroke-width: 1.5px;
    }
  </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 width = 800;
    var height = 400;
​
    // https://bl.ocks.org/zanarmstrong/raw/05c1e95bf7aa16c4768e/
    var parseDate = d3.time.format("%Y-%m");
    var displayDate = d3.time.format("%b %y");
    var displayValue = d3.format(",.0f");
    
    // Ordinal scale
    var x = d3.scale.ordinal()
        .rangeRoundBands([0, width], .5);
​
    var y = d3.scale.linear()
        .range([height, height - 200]);
​
    var line = d3.svg.line()
        .x(function(d) { return x(d.name); })
        .y(function(d) { return y(d.value); });
    
    var g = svg.append("g")
        .attr("transform", "translate(50, 0)")
    
    d3.json("https://gist.githubusercontent.com/mbostock/1256572/raw/44c086a6019de56dce35a47197a19468b3e4ad57/stocks.csv", function(data) {
​
      console.log(raw);
      
      var dsv = d3.dsvFormat(',');
      var data = dsv.parse(raw);
      
      // Pre-processing
      data.forEach(function(d) {
                d.price = parseInt(d.price);
        d.date = parseDate(d.date);
       
      });
      
      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.value; })]);
      
      svg.selectAll("text").data(data).enter()
       .append("text")
        .text(function(d, i) { return displayDate(d.date); })
        .attr("y", 420)
        .attr("x", function(d) { return x(d.name); })
        .style("font-size", 10)
        .style("font-family", "monospace");
​
      g.selectAll(".value").data([data[data.length -1]]).enter()
       .append("text")
        .text(function(d, i) { return displayValue(d.value); })
        .attr("class", "value")
        .attr("y", function(d) { return y(d.value); })
        .attr("x", width - 20)
        .style("font-size", 20)
        .style("font-family", "monospace");
​
      g.selectAll("path").data([data]).enter().append("path")
        .attr("class", "line")
        .attr("d", line);
​
      
    });
​
  </script>
</body>
​
    