D3 Examples - London Small Multiples

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="london-grid.js"></script>
  <style>
    body {
      margin: 0;
    }
    
    text {
      font-family: monospace;
    }
    
    .label {
      font-size: 10px;
    }
    
    .constituency .background {
      fill: grey;
      fill-opacity: 0.2;
    }
    
    div.tooltip {
      position: absolute;
      text-align: left;
      padding: 5px;
      font: 10px monospace;     
      background-color: rgba(255, 255, 255, .95);
      border: 1px solid lightgray;
      pointer-events: none; 
      width: 100px;
    }
    
    div.tooltip .result {
      float: right;
    }
    
    div.tooltip .name {
      font-weight: bold;
    }
    
  </style>
</head>
​
<body>
  <script>
   
   var cfg = {
      gridLength: 11,
      gridHeight: 10,
      paddingX: 25,
        paddingY: 15,
    }
    
    var margin = {top: 15, right: 100, bottom: 15, left: 100};
    
    var width = 960 - margin.left - margin.right,
            height = 500 - margin.top - margin.bottom;
    
    var svg = d3.select("body").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 div = d3.select("body").append("div")
        .attr("class", "tooltip")
        .style("opacity", 0);
    
    var rectWidth = (width / cfg.gridLength) - cfg.paddingX,
        rectHeight = (height / cfg.gridHeight) - cfg.paddingY;    
    
    var dataUrl = "results.json";
    
    var colours = {
      "Con": "#0087dc",
      "Green": "#008066",
      "Lab": "#d50000",
      "LabCoop": "#d50000",
      "LibDem": "#FDBB30",
      "UKIP": "#B3009D"
    };
    
    var constituencies = svg.append("g").attr("class", "constituencies");  
    
    function calculateCoords(d) {
      var x = d.position.x * (rectWidth + cfg.paddingX);
      var y = d.position.y * (rectHeight + cfg.paddingY);
      return [x, y];
    }
    
    // Only include data for five main parties
    var filteredGeData = {};
    
    d3.json(dataUrl, function(geData) {
     
      for (var c in geData) {
        var candidates = [];
        for (var i in geData[c].candidates) {
          if (colours[geData[c].candidates[i].party]) {
            candidates.push(geData[c].candidates[i]);
          }
        }
        filteredGeData[c] = {
          ons: c,
          name: geData[c].name,
          candidates: candidates
        };
      }
     
        var constituency = constituencies.selectAll("g")
            .data(londonGrid)
        .enter().append("g")
            .attr("class", "constituency")
            .attr("transform", d => "translate(" + [calculateCoords(d)[0], calculateCoords(d)[1]] + ")")
        .on("mouseover", showLabel)
        .on("mouseout", hideLabel);
​
        constituency.append("rect")
        .attr("class", "background")
            .attr("width", rectWidth)
            .attr("height", rectHeight);
      
        constituency.each(addBarchart);
      
    });
    
    function addBarchart(d) {
      var barchart = d3.select(this),
          results = filteredGeData[d.ons_code];
      
      var x = d3.scaleBand()
        .domain(results.candidates.map(d => d.party))
        .range([0, rectWidth]);
      
      var y = d3.scaleLinear()
        .domain([0, 100])
        .range([rectHeight, 0]);
            
      var bars = barchart.append("g")
        .selectAll("rect")
        .data(results.candidates)
      .enter().append("rect")
        .attr("x", d => x(d.party))
        .attr("y", d => y(d.percentageShare))
        .attr("width", x.bandwidth())
        .attr("height", d => rectHeight - y(d.percentageShare))
        .style("fill", d => colours[d.party]);
      
      var label = barchart.append("text")
        .attr("class", "label")
        .attr("x", rectWidth)
        .attr("dx", -rectWidth / 3)
        .attr("dy", rectHeight / 3)
        .text(d => d.name.slice(0, 2));
      
    }
    
    function showLabel(d) {
            var left = calculateCoords(d)[0],
          right = calculateCoords(d)[1];
      
      var candidates = filteredGeData[d.ons_code].candidates;
      
      var html = "<span class='name'>" + filteredGeData[d.ons_code].name + "</span></br></br>";
      
      candidates.forEach(function(c) {
        html += c.party;
        html += "<span class='result'>" + Math.round(c.percentageShare) + "%</span>";
        html += "</br>";
      });
      
      div.transition()
        .duration(200)
        .style("opacity", 1)
      div.html(html)    
        .style("left", (left + margin.left + rectWidth + 10) + "px")        
        .style("top", (right + margin.top) + "px")
        }
    
    function hideLabel(d) {     
      div.transition()
        .duration(200)
        .style("opacity", 0)
    }
    
  </script>
</body>
​
    