D3 Examples - sparkline

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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; }
    
    .chart {
      margin: 100px;
      border: 1px solid #ddd;
    }
  </style>
</head>
​
<body>
  <script>
    var margin = { top: 10, right: 10, bottom: 10, left: 10 };
    var outerWidth = 300;
    var outerHeight = 100;
    var width = outerWidth - margin.left - margin.right;
    var height = outerHeight - margin.top - margin.bottom;
​
    var svg = d3.select("body").append("svg")
        .attr('class', 'chart')
      .attr("width", outerWidth)
      .attr("height", outerHeight)
    .append('g')
        .attr('transform', `translate(${margin.left}, ${margin.top})`);
    
    var x = d3.scaleTime().range([0, width]);
    var y = d3.scaleLinear().range([height, 0]);
    
    var line = d3.line()
        .x(d => x(d.date))
        .y(d => y(d.value));
    
    var target = d3.line()
        .x(d => x(d.date))
        .y(d => y(d.target));
    
    function draw(error, data) {
      if (error) return;
      
      data.forEach((d) => {
        d.value = +d.value;
        d.target = +d.target;
        d.date = new Date(d.date);
      });
      
      data2 = data.slice(0, 10);
      
      x.domain(d3.extent(data, d => d.date));
      y.domain([0, d3.max(data, d => d.value+d.target)]);
      
      svg.append('path')
        .attr('class', 'target')
        .attr('stroke', '#ddd')
        .attr('fill', 'none')
        .attr('d', target(data));
      
      svg.append('path')
        .attr('class', 'line')
        .attr('stroke', 'skyblue')
        .attr('fill', 'none')
        .attr('d', line(data));
    }
    
    d3.csv('data.csv', draw);
​
  </script>
</body>
​
    