Tornado Chart - d3.js

HTML

<p id="example"></p>

CSS

.bar--positive {
  fill: #9BCCF5;
}

.bar--negative {
  fill: pink;
}

text {
  font: 10px sans-serif;
}

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

JavaScript

function tornadoChart() {
  var margin = {top: 20, right: 30, bottom: 40, left: 100},
    width = 550 - margin.left - margin.right,
    height = 200 - margin.top - margin.bottom;

 var x = d3.scale.linear()
      .range([0, width]);

  var y = d3.scale.ordinal()
      .rangeRoundBands([0, height], 0.1);

 var xAxis = d3.svg.axis()
      .scale(x)
      .orient("bottom")
      .ticks(7)

 var yAxis = d3.svg.axis()
      .scale(y)
      .orient("left")
      .tickSize(0)
  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 + ")");

  function chart(selection) {
    selection.each(function(data) {

      x.domain(d3.extent(data, function(d) { return d.interactions; })).nice();
      y.domain(data.map(function(d) { return d.age; }));

      var minInteractions = Math.min.apply(Math, data.map(function(o){return o.interactions;}))
      yAxis.tickPadding(Math.abs(x(minInteractions) - x(0)) + 10);

      var bar = svg.selectAll(".bar")
          .data(data)

      bar.enter().append("rect")
          .attr("class", function(d) { return "bar bar--" + (d.interactions < 0 ? "negative" : "positive"); })
          .attr("x", function(d) { return x(Math.min(0, d.interactions)); })
          .attr("y", function(d) { return y(d.age); })
          .attr("width", function(d) { return Math.abs(x(d.interactions) - x(0)); })
          .attr("height", y.rangeBand())

      bar.enter().append('text')
          .attr("text-anchor", "middle")
          .attr("x", function(d,i) {
              return x(Math.min(0, d.interactions)) + (Math.abs(x(d.interactions) - x(0)) / 2);
          })
          .attr("y", function(d,i) {
              return y(d.age) + (y.rangeBand() / 2);
          })
          .attr("dy", ".35em")
          .text(function (d) { return d.interactions; })

     ...