D3 Examples - 2016 MLB Team ERA

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
  body { font: 12px sans-serif}  
  
.bar {
  fill: steelblue;
}
​
.axis text {
  font: 10px sans-serif;
}
​
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
.x.axis path {
  display: none;
}
​
  .d3-tip {
  line-height: 1;
  font-weight: bold;
  padding: 12px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  border-radius: 2px;
}
​
/* Creates a small triangle extender for the tooltip */
.d3-tip:after {
  box-sizing: border-box;
  display: inline;
  font-size: 10px;
  width: 100%;
  line-height: 1;
  color: rgba(0, 0, 0, 0.8);
  content: "\25BC";
  position: absolute;
  text-align: center;
}
​
/* Style northward tooltips differently */
.d3-tip.n:after {
  margin: -1px 0 0 0;
  top: 100%;
  left: 0;
}
</style>
<svg class="chart"></svg>
<script src="//d3js.org/d3.v3.min.js" charset="utf-8"></script>
<script src="https://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script>
​
<script>
​
var margin = {top: 20, right: 30, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
var x = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1);
​
var y = d3.scale.linear()
    .range([height, 0]);
​
var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");
​
var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");
  
var tip = d3.tip()
  .attr('class', 'd3-tip')
  .offset([-10, 0])
  .html(function(d) {
    return "<strong>Earned Run Average (ERA):</strong> <span style='color:red'>" + d.ERA + "</span>";
  })
​
var chart = d3.select(".chart")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
chart.call(tip);  
  
d3.tsv("data.tsv", type, function(error, data) {
  x.domain(data.map(function(d) { return d.teamID; }));
  y.domain([0, d3.max(data, function(d) { return d.ERA; })]);
​
  chart.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);
​
  chart.append("g")
      .attr("class", "y axis")
      .call(yAxis);
​
  chart.selectAll(".bar")
      .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.teamID); })
      .attr("y", function(d) { return y(d.ERA); })
      .attr("height", function(d) { return height - y(d.ERA); })
      .attr("width", x.rangeBand())
        .on('mouseover', tip.show)
      .on('mouseout', tip.hide);
  
});
​
function type(d) {
  d.ERA = +d.ERA; // coerce to number
  return d;
}
​
</script>
    