D3 Examples - real line graph

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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>
  <script>
    var city = "San Francisco";
    var width = 800;
    var height = 300;
    var margin = {top:20,bottom:20,left:20,right:20};
   
    d3.tsv ('data.tsv',(err,data) => {
      data.forEach(d => {
        d.date = d3.timeParse('%Y%m%d')(d.date);
        d.date = new Date(d.date);
        d[city] = ++d[city];//converting data to integer
      });
      
      //create the scales
      var xExtent = d3.extent(data,d => d.date);
      var xScale = d3.scaleTime()
        .domain(xExtent)
        .range([margin.left,width-margin.right]);
      
      var yMax = d3.max(data,d => d[city]);
      var yScale = d3.scaleLinear()
        .domain([0,yMax])
        .range([height-margin.bottom,margin.top]);
      var heightScale = d3.scaleLinear()
      .domain([0,yMax])
      .range([0,height-margin.top-margin.bottom]);
      
      //create the rectangles
      var svg = d3.select('svg');
      
      var rect = svg.selectAll('rect')
        .data(data) 
        .enter().append('rect')
        .attr('width',2)
        .attr('height',function(d){return heightScale(d[city])})
        .attr('x',function(d) {return xScale(d.date)})
        .attr('y',function(d) {return yScale(d[city])})
        .attr('fill','blue')
        .attr('stroke','white');
      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);
      
      
    });
​
  </script>
</body>
​
    