D3 Examples - 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: sans-serif;
        fill: #aaa;
      }
​
      text.axis-workweek {
        fill: #000;
      }
​
      text.axis-worktime {
        fill: #000;
    
      }
      text.timeLabel {
        transform: rotate(-90deg);
      }
    </style>
    <script src="https://d3js.org/d3.v3.js"></script>
  </head>
  <body>
    <div id="chart"></div>
    <div id="dataset-picker">
    </div>
    <script type="text/javascript">
      var margin = { top: 100, right: 0, bottom: 100, left: 100 },
          width = 960 - margin.left - margin.right,
          height = 480 - margin.top - margin.bottom,
          gridSize = Math.floor(width / 24),
          legendElementWidth = gridSize*2,
          buckets = 9,
          colors = ["#f7f7f7","#FEF889","#bcda7f","#66b565","#4a935e","#3d794e"], // alternatively colorbrewer.YlGnBu[9]
          days = ["Holmes, Tammy","Clark", "JoanWagner", "JanePalmer", "KevinJones", "JacobLewis", "ZacharyWong"],
          times = ["LA.8.RL.8.1", "LA.8.RL.8.2", "LA.8.RL.8.3", "LA.8.RL.8.4", "LA.8.RL.8.5", "LA.8.RL.8.6", "LA.8.RL.8.7", "LA.8.RL.8.8", "LA.8.RL.8.9", "LA.8.RL.8.10", "LA.8.RI.8.1", "LA.8.RI.8.2", "LA.8.RI.8.3", "LA.8.RI.8.4", "LA.8.RI.8.5", "LA.8.RI.8.6", "LA.8.RI.8.7", "LA.8.RI.8.8", "LA.8.RI.8.9", "LA.8.RI.8.10", "LA.8.RI.8.11", "LA.8.RI.8.12", "LA.8.RI.8.13", "LA.8.RI.8.14"];
          datasets = ["data.tsv", "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", 10)
            .attr("y", function(d, i) { return (i * gridSize)+20; })
            
            .attr("transform", "translate(" + gridSize / 2 + ", -6)")
            .attr("class", function(d, i) { return ((i >= 7 && i <= 16) ? "timeLabel mono axis axis-worktime" : "timeLabel mono axis"); });
​
      var heatmapChart = function(tsvFile) {
        d3.tsv(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) { return "≥ " + Math.round(d); })
            .attr("x", function(d, i) { return legendElementWidth * i; })
            .attr("y", height + gridSize);
​
          legend.exit().remove();
​
        });  
      };
​
      heatmapChart(datasets[0]);
      
      var datasetpicker = d3.select("#dataset-picker").selectAll(".dataset-button")
        .data(datasets);
​
      datasetpicker.enter()
        .append("input")
        .attr("value", function(d){ return "Dataset " + d })
        .attr("type", "button")
        .attr("class", "dataset-button")
        .on("click", function(d) {
          heatmapChart(d);
        });
    </script>
  </body>
</html>
    