D3 Examples - Sortable bar chart

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•<!DOCTYPE html>
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<! based on https://bl.ocks.org/mbostock/3885705 by Mike Bostock >
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<title>Bar chart</title>
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<meta charset="utf-8">
<link type="text/css" rel="stylesheet" href="tooltip-styles-barchart.css">
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​
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<style>
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body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  position: relative;
  width: 960px;
}
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.axis text {
  font: 10px sans-serif;
}
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.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
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.bar {
  fill: orangered;
  fill-opacity: .9;
}
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.bar:hover {
  fill: red;
}
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.x.axis path {
  display: none;
}
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label {
  position: absolute;
  top: 10px;
  right: 10px;
  
  
}
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</style>
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<body>
​
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<p></p>
<label><input type="checkbox"> Sort values</label>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="d3-tip.js"></script>
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<script>
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var margin = {top: 50, right: 20, bottom: 30, left: 30},
    width = 1350 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
var formatPercent = d3.format(".0%");
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var x = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1, 1);
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var y = d3.scale.linear()
    .range([height, 0]);
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var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");
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var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .tickFormat(formatPercent);
​
    var tip = d3.tip()
  .attr('class', 'd3-tip')
  .offset([-23, -8])
  .html(function(d) {
    return "<strong>Frequency:</strong> " + d.frequency;
  })
    
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 + ")");
    
    
​
  
  svg.call(tip);
​
d3.tsv("barchart.tsv", function(error, data) {
​
  data.forEach(function(d) {
    d.frequency = +d.frequency;
  });
​
  x.domain(data.map(function(d) { return d.letter; }));
  y.domain([0, d3.max(data, function(d) { return d.frequency; })]);
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  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);
​
  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Frequency");
​
  svg.selectAll(".bar")
      .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.letter); })
      .attr("width", x.rangeBand())
      .attr("y", function(d) { return y(d.frequency); })
      .attr("height", function(d) { return height - y(d.frequency); })
      .on('mouseover', tip.show)
      .on('mouseout', tip.hide);
​
  d3.select("input").on("change", change);
  
​
  
  svg.selectAll(".bar")
    .filter(function (d) {return d.letter == "N" ; })
    .style("fill", "black");
    
​
​
​
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  function change() {
​
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    // Copy-on-write since tweens are evaluated after a delay.
    var x0 = x.domain(data.sort(this.checked
        ? function(a, b) { return b.frequency - a.frequency; }
        : function(a, b) { return d3.ascending(a.letter, b.letter); })
        .map(function(d) { return d.letter; }))
        .copy();
​
    var transition = svg.transition().duration(750),
        delay = function(d, i) { return i * 50; };
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    transition.selectAll(".bar")
        .delay(delay)
        .attr("x", function(d) { return x0(d.letter); });
​
    transition.select(".x.axis")
        .call(xAxis)
      .selectAll("g")
        .delay(delay);
  }
});
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</script>
​
</body>
    