Small Multiple Bar Charts UK GE 2017

Sortable D3.js small multiple bar charts for the 2017 UK GE results.

Data from FT. Uses d3-tip for tooltips.

Open in full browser mode to see all 632 constituency results

forked from officeofjane's block: Small multiple bar charts with tooltips

forked from tlfrd's block: Small Multiple Bar Charts UK GE 2017

<!DOCTYPE html>

<html>
<meta charset="utf-8">
<head>
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="d3-tip.js"></script>
  
  <style type="text/css">
  body {
    font: 11px sans-serif;
    margin: 10px;
  }

.axis path,
  .axis line {
    fill: none;
    stroke: #000;
    shape-rendering: crispEdges;
  }

.bar:hover {
    fill: #bcbcbc ;
  }

.x.axis path {
    display: none;
  }
  </style>
</head>

<body>
Sort by
<a href="#" class="sort-btn" data-sort="Cons">Conservative</a> /
<a href="#" class="sort-btn" data-sort="Lab">Labour</a> /
<a href="#" class="sort-btn" data-sort="LD">Lib Dems</a> /
<a href="#" class="sort-btn" data-sort="Gre">Greens</a> /
<a href="#" class="sort-btn" data-sort="PC">Plaid Cymru</a> /
<a href="#" class="sort-btn" data-sort="SNP">SNP</a> /
<a href="#" class="sort-btn" data-sort="UKIP">UKIP</a>
  
  <div id="vis"></div>
<script type="text/javascript">

// need to switch to d3v4 and use ES6 where possible for mapping data
  
var margin = {top: 45, right: 100, bottom: 20, left: 20},
    width = 300 - margin.left - margin.right,
    height = 110 - margin.top - margin.bottom;
  
var barWidth = 50;

var formatPercent = d3.format(".0%");
  
var dataUrl = "https://raw.githubusercontent.com/ft-interactive/ge2017-dataset/master/financialTimes_ge2017_dataset.csv";

var partyColours = {
  "Cons": "#0087dc",
  "Gre": "#008066",
  "Lab": "#d50000",
  "LD": "#FDBB30",
  "PC": "#3F8428",
  "SNP": "#FFF95D",
  "UKIP": "#B3009D"
};

var x = d3.scaleBand()
    .range([0, width])
		.round(0.1);

// Scales. Note the inverted domain fo y-scale: bigger is up!
var y = d3.scaleLinear()
    .range([height, 0]);

var xAxis = d3.axisBottom()
    .scale(x);

var yAxis = d3.axisLeft()
    .scale(y)
    .tickFormat(formatPercent);

var tip = d3.tip()
  .attr('class', 'd3-tip')
  .offset([-1, 0])
  .html(function(d) {
    return Math.round(d.percent) + "%";
  })

var nestedGeData = [];
  
d3.selectAll(".sort-btn")
  .on("click", function(d) {
    d3.event.preventDefault();
  	sortByParty(this.dataset.sort);
  });

d3.csv(dataUrl, function(geData) {
        
    var parties = [
      "Cons",
      "Gre",
      "Lab",
      "LD",
      "PC",
      "SNP",
      "UKIP"
    ]
 
    geData.forEach(function(g) {
      var key = g.PCON15CD;
      var seat = g.seat;

x.domain(parties);

y.domain([0, 100]);

var svg = d3.select("#vis").selectAll("svg")
      .data(nestedGeData)
      .enter()
      .append("svg:svg")
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
    .append("g")
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
    	.each(multiple);

svg.append("g")
        // Hide y axis
        // .attr("class", "y axis")
        // .call(yAxis)
      .append("text")
      .attr("x", 0)
      .attr("y", 0)
      .attr("dy", "-1em")
      .attr("text-anchor", "start")
      .attr("font-size", "1.1em")
      .text(function(d) { return d.seat});

svg.call(tip);

});
  
  function multiple(constituency) {
      
      var svg = d3.select(this);
      var x = d3.scaleBand();
      
      var sortedValues = constituency.values.sort(function(a, b) {
        return b.percent - a.percent;
      });
	
      x.domain(sortedValues.map(function(d) { return d.party; }))

var calculatedWidth = barWidth * (x.domain().length - 1);

x.range([0, calculatedWidth])
        .round(0.1);      
      
      
      var xAxis = d3.axisBottom()
        .scale(x);
      
      var yAxis = d3.axisLeft()
        .scale(y)
        .tickFormat(formatPercent);
      	
      svg.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis);
      
      svg.selectAll(".bar")
        .data(function(d) { return d.values; })
        .enter()
        .append("rect")
        .attr("class", "bar")
        .attr("x", function(d) { return x(d.party); })
        .attr("width", x.bandwidth())
        .attr("y", function(d) { return y(d.percent); })
        .attr("height", function(d) { return height - y(d.percent); })
        .attr("fill", function(d) {return partyColours[d.party]})
        .on('mouseover', tip.show)
        .on('mouseout', tip.hide);
    }
  
  	function sortByParty(partyName) {
      
      d3.selectAll("svg").remove();
      
      var filteredData = nestedGeData.filter(function(a) {
        for (var i in a.values) {
          if (a.values[i].party === partyName) {
            return true;
          }
        }
        return false;
      });
    
      var nestedGeDataSorted = filteredData.sort(function(a, b) {
       	var aPc;
        var bPc;
        for (var i in a.values) {
          if (a.values[i].party === partyName) {
            aPc = a.values[i].percent;
          }
        }
        for (var i in b.values) {
          if (b.values[i].party === partyName) {
            bPc = b.values[i].percent;
          }
        }
        return bPc - aPc;
      });
      
      var svg = d3.select("#vis").selectAll("svg")
        .data(nestedGeDataSorted)
        .enter()
        .append("svg:svg")
        .attr("width", width + margin.left + margin.right)
        .attr("height", height + margin.top + margin.bottom)
      .append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
        .each(multiple);

svg.append("g")
          // Hide y axis
          // .attr("class", "y axis")
          // .call(yAxis)
        .append("text")
        .attr("x", 0)
        .attr("y", 0)
        .attr("dy", "-1em")
        .attr("text-anchor", "start")
        .attr("font-size", "1.1em")
        .text(function(d) { return d.seat});
    }

</script>
</body>
</html>

Modified http://d3js.org/d3.v4.min.js to a secure url

https://d3js.org/d3.v4.min.js