line chart (temporal data) by romsson

index.html

<!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; }
  </style>
</head>

<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var margin = {top: 20, right: 10, bottom: 20, left: 10};

    var width = 480 - margin.left - margin.right,
        height = 250 - margin.top - margin.bottom;
    
    var svg = d3.select("body").append("svg")
      .attr("width", width)
      .attr("height", height)

 //   var data = d3.range(10).map(Math.random)

   	d3.json("dataset.json", function(data) { 

      var parseDate = d3.timeParse("%Y-%m")
      var displayDate = d3.timeFormat("%b %y")
      
      data.forEach(function(d) {
        d.value = +d.value;
        d.date = parseDate(d.date);
      });
      
      var x = d3.scaleTime()
          .domain(d3.extent(data, function(d) { return d.date; }))
          .range([margin.left, width + margin.left])

      var y = d3.scaleLinear()
          .domain([d3.min(data, function(d) { return d.value; }), 
                   d3.max(data, function(d) { return d.value; })])
          .range([margin.top, height + margin.top])

        var line = d3.line()
          .curve(d3.curveMonotoneX)
          .x(function(d, i) {  return x(d.date); })
          .y(function(d, i)  {  return height-y(d.value); })

      svg.selectAll("path").data([data]).enter()
        .append("path")
        .style("fill", "none")
        .style("stroke", "black")
        .attr("d", line);

      svg.selectAll("text").data(data).enter()
      	.append('text')
      	.attr("x", function(d, i) {  return x(d.date); })
      	.attr("y", function(d, i)  {  return height; })
      	.text(function(d) { return displayDate(d.date)})
      
    })

  </script>
</body>

dataset.json

[{"id" : 1, "name": "A", "value": 10, "date": "2016-01"}, 
{"id" : 2, "name": "B", "value": 30, "date": "2016-02"}, 
{"id" : 3, "name": "C", "value": 20, "date": "2016-03"} ,
{"id" : 3, "name": "C", "value": 20, "date": "2016-04"} ]