D3 Examples - FEM: Exercise 2 Line

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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; }
    svg {
      width: 100%;
      height: 100%;
    }
    
  </style>
</head>
​
<body>
  
  <svg></svg>
  <script>
    
    function updateCity(c){
      var city = c;
      var width = 800;
      var height = 300;
      var margin = {top: 20, right: 20, bottom: 20, left: 20};
​
      // dataset of city temperatures across time
      d3.tsv('data.tsv', (err, data) => {
        // clean the data
        data.forEach(d => {
          d.date = d3.timeParse("%Y%m%d")(d.date);
          d.date = new Date(d.date); // x
          d[city] = +d[city]; // y
        });
        
        //extents
        var xExtent = d3.extent(data, d => d.date);
        var yExtent = d3.extent(data, d => d[city]);
        var yMax = d3.max(data, d => d[city]);
        
        //scales
        var xScale = d3.scaleTime()
            .domain(xExtent)
            .range([margin.right, width - margin.left]);
                
        var yScale = d3.scaleLinear()
            .domain([0, yMax])
            .range([height - margin.top, margin.bottom]);
        
        //line
        var line = d3.line()
            .x(d => xScale(d.date))
            .y(d => yScale(d[city]));
        
        var svg = d3.select('svg');
        svg.append('path')
            .attr('d', line(data))
            .attr('stroke', 'steelblue')
            .attr('fill', 'none');
        
        //x-axis & y-axis
        var xAxis = d3.axisBottom().scale(xScale);
        var yAxis = d3.axisLeft().scale(yScale);
        
        svg.append('g')
            .attr('transform', 'translate(' + [0, height - margin.bottom] + ')')
            .call(xAxis);
        
        svg.append('g')
        .attr('transform', 'translate(' + [margin.left, 0] + ')')
            .call(yAxis);
      });
     }
    
    updateCity('New York');
  </script>
</body>
​
​
    