D3 Examples - 538 Tweet Activity Heatmap

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<!DOCTYPE html>
<meta charset="utf-8">
<html>
  <head>
    <style>
      rect.bordered {
        stroke: #E6E6E6;
        stroke-width:2px;   
      }
​
      text.mono {
        font-size: 9pt;
        font-family: Consolas, courier;
        fill: #aaa;
      }
​
      text.axis-workweek {
        fill: #000;
      }
​
      text.axis-worktime {
        fill: #000;
      }
    </style>
    <script src="https://d3js.org/d3.v3.js"></script>
  </head>
  <body>
    <div id="chart"></div>
    <script type="text/javascript">
      var margin = { top: 50, right: 0, bottom: 100, left: 30 },
          width = 960 - margin.left - margin.right,
          height = 430 - margin.top - margin.bottom,
          gridSize = Math.floor(width / 24),
          legendElementWidth = gridSize*2,
          buckets = 9,
          colors = ["#ffffd9","#edf8b1","#c7e9b4","#7fcdbb","#41b6c4","#1d91c0","#225ea8","#253494","#081d58"],
          days = ["Mo", "Tu", "We", "Th", "Fr", "Sa", "Su"],
          times = ["1a", "2a", "3a", "4a", "5a", "6a", "7a", "8a", "9a", "10a", "11a", "12a", "1p", "2p", "3p", "4p", "5p", "6p", "7p", "8p", "9p", "10p", "11p", "12p"];
          datasets = ["hours.csv", "data2.tsv"];
​
      var svg = d3.select("#chart").append("svg")
          .attr("width", width + margin.left + margin.right)
          .attr("height", height + margin.top + margin.bottom)
          .append("g")
          .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
      var dayLabels = svg.selectAll(".dayLabel")
          .data(days)
          .enter().append("text")
            .text(function (d) { return d; })
            .attr("x", 0)
            .attr("y", function (d, i) { return i * gridSize; })
            .style("text-anchor", "end")
            .attr("transform", "translate(-6," + gridSize / 1.5 + ")")
            .attr("class", function (d, i) { return ((i >= 0 && i <= 4) ? "dayLabel mono axis axis-workweek" : "dayLabel mono axis"); });
​
      var timeLabels = svg.selectAll(".timeLabel")
          .data(times)
          .enter().append("text")
            .text(function(d) { return d; })
            .attr("x", function(d, i) { return i * gridSize; })
            .attr("y", 0)
            .style("text-anchor", "middle")
            .attr("transform", "translate(" + gridSize / 2 + ", -6)")
            .attr("class", function(d, i) { return ((i >= 9 && i <= 18) ? "timeLabel mono axis axis-worktime" : "timeLabel mono axis"); });
​
      var heatmapChart = function(tsvFile) {
        d3.csv(tsvFile,
        function(d) {
          return {
            day: +d.day,
            hour: +d.hour,
            value: +d.value
          };
        },
        function(error, data) {
          var colorScale = d3.scale.quantile()
              .domain([0, buckets - 1, d3.max(data, function (d) { return d.value; })])
              .range(colors);
​
          var cards = svg.selectAll(".hour")
              .data(data, function(d) {return d.day+':'+d.hour;});
​
          cards.append("title");
​
          cards.enter().append("rect")
              .attr("x", function(d) { return (d.hour - 1) * gridSize; })
              .attr("y", function(d) { return (d.day - 1) * gridSize; })
              .attr("rx", 4)
              .attr("ry", 4)
              .attr("class", "hour bordered")
              .attr("width", gridSize)
              .attr("height", gridSize)
              .style("fill", colors[0]);
​
          cards.transition().duration(1000)
              .style("fill", function(d) { return colorScale(d.value); });
​
          cards.select("title").text(function(d) { return d.value; });
          
          cards.exit().remove();
​
          var legend = svg.selectAll(".legend")
              .data([0].concat(colorScale.quantiles()), function(d) { return d; });
​
          legend.enter().append("g")
              .attr("class", "legend");
​
          legend.append("rect")
            .attr("x", function(d, i) { return legendElementWidth * i; })
            .attr("y", height)
            .attr("width", legendElementWidth)
            .attr("height", gridSize / 2)
            .style("fill", function(d, i) { return colors[i]; });
​
          legend.append("text")
            .attr("class", "mono")
            .text(function(d) { 
                if (Math.round(d) === 0) { return "≥ 0"; }; return "≥ " + Math.round(d) + "00"; })
            .attr("x", function(d, i) { return legendElementWidth * i; })
            .attr("y", height + gridSize);
​
          legend.exit().remove();
​
        });  
      };
​
      heatmapChart(datasets[0]);
      
    </script>
  </body>
</html>
    