verticalBar_animation_tweening

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font: 12px sans-serif;
}

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

</style>
<body>
  <h1 id="title">Run Count by Day of Week</h1>
  <div id="dropdown"></div>
  <div id="chart"></div>
  <div id="mouseover"> </div>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="//d3js.org/d3-scale-chromatic.v0.3.min.js"></script>
<script>

var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 400 - margin.top - margin.bottom;

var x = d3.scaleBand()
    .padding([.1])
    .rangeRound([0, width]);

var y = d3.scaleLinear()
    .range([height, 0]);

var numberFormat = d3.format(",d")

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 + ")");

d3.tsv("running.tsv", function(error, data) {
  if (error) throw error;

data.forEach(function(d) {
    d["Distance"] = +d["Distance"];
    d["Elevation Gain"] = +d["Elevation Gain"];
    d["Avg HR"] = +d["Avg HR"];
    d["Max HR"] = +d["Max HR"];
  });

var dateOrder = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]

// Aggregate data
  var nestedData = d3.nest()
        .key(function(d) { return d["Day of Week"]})
        .rollup(function(leaves) {
          return {
            "Distance": d3.sum(leaves, function(d) { return d["Distance"]}),
            "Number of Runs": leaves.length,
            "Avg HR": d3.mean(leaves, function(d) { return d["Avg HR"]}),
            "Elevation Gain": d3.sum(leaves, function(d) { return d["Elevation Gain"]}),
            "Max HR": d3.max(leaves, function(d) { return d["Max HR"]})
          }
        })
        .entries(data);

var options = ["Distance","Elevation Gain","Avg HR","Max HR"];

x.domain(d3.set(data.map(function(d) { return d["Day of Week"]; })).values().sort(function(a,b) { return dateOrder.indexOf(a) - dateOrder.indexOf(b); }));
  x.domain(dateOrder);
  y.domain(d3.extent(nestedData.map(function(d) { return d.value["Number of Runs"] }))).nice();

svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x))

svg.append("g")
      .attr("class", "y axis")
      .call(d3.axisLeft(y))

var color = d3.scaleOrdinal(d3.schemeSet3);

// Add custom scales
    var elevationColor = d3.scaleLinear()
        .range(["white", "steelblue"])
        .domain(d3.extent(nestedData.map(function(d) { return d.value["Elevation Gain"] })))

svg.selectAll(".bar")
      .data(nestedData)
    .enter().append("rect")
      .attr("class",function(d) { return "bar " + d.value["Day of Week"]; })
      .attr("width", x.bandwidth())
      .attr("height", function(d) { return height - y(d.value["Number of Runs"]); })
      .attr("x", function(d) { return x(d.key); })
      .attr("y", function(d) { return y(d.value["Number of Runs"]); })

// Adjusting by color 
      .style("stroke", "#000")
      .style("fill", "steelblue")
      // .style("fill", function(d) { return elevationColor(d.value["Elevation Gain"]); })
      .style("fill", function(d) { return color(d.key); })

// Adding interactions
      .on("mouseenter", function(d) {

d3.select("#mouseover")
        .text(d.key + ": " + 
          d.value["Number of Runs"] + " runs, " + 
          numberFormat(d.value["Distance"]) + " miles ran, " + 
          numberFormat(d.value["Elevation Gain"]) + " total elevation gain, and an average BPM of" + 
          numberFormat(d.value["Avg HR"])
          )

})
      .on("mouseleave", function(d) {

d3.select("#mouseover")
        .text("");

})

svg.selectAll(".bar-text")
      .data(nestedData)
    .enter().append("text")
      .attr("class",function(d) { return "bar-text " + d.value["Day of Week"]; })
      .attr("x", function(d) { return x(d.key); })
      .attr("y", function(d) { return y(d.value["Number of Runs"]); })
      .attr("dy", -2)
      .text(function(d) { return numberFormat(d.value["Number of Runs"])})

// Add in other features, like a dropdown for different metrics
  var options = ["Number of Runs", "Elevation Gain","Distance","Avg HR","Max HR"];
  
  var dropdown = d3.select("#dropdown")
      .append("select")
      .on("change", change);

dropdown.selectAll("option")
      .data(options)
    .enter().append("option")
    .text(function(d) { return d; }); 
    
  function change() {

var column = this.value,
        text = column + " by Day of Week";

y.domain(d3.extent(nestedData.map(function(d) { return d.value[column] }))).nice();

d3.select("#title")
      .text(text)

d3.selectAll(".bar")
      .transition()
      .duration(2000)
      .attr("height", function(d) { return height - y(d.value[column]); })
      .attr("y", function(d) { return y(d.value[column]); });

d3.selectAll(".bar-text")
      .transition()
      .duration(2000)
      .attr("y", function(d) { return y(d.value[column]); })
      .attr("dy", -2)   
      .on("start", function repeat(d) {
      d3.active(this)
          .tween("text", function() {
            var that = d3.select(this),
                i = d3.interpolateNumber(that.text().replace(/,/g, ""), d.value[column]);
            return function(t) { that.text(numberFormat(i(t))); };
          })
        .transition()
          .delay(1500)
          .on("start", repeat);
    });

d3.select(".y")
      .transition()
      .call(d3.axisLeft(y))
      .select(".label")
      .text(column)
  }

});

</script>

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

https://d3js.org/d3-scale-chromatic.v0.3.min.js