Wrapping Long Labels 2.0

This example, using satirical data from The Onion, demonstrates how to wrap long axis labels to fit on multiple lines.

forked from mbostock's block: Wrapping Long Labels 2.0

forked from anonymous's block: Wrapping Long Labels 2.0

forked from ericsoco's block: Wrapping Long Labels 2.0

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

.bar {
  fill: steelblue;
}

.bar:hover {
  fill: brown;
}

.title {
  font: bold 14px "Helvetica Neue", Helvetica, Arial, sans-serif;
}

.axis {
  font: 10px sans-serif;
}

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

.x.axis path {
  display: none;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var margin = {top: 80, right: 180, bottom: 80, left: 180},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1, .3);

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")
    .ticks(8, "%");

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 + ")");

d3.tsv("data.tsv", type, function(error, data) {
  x.domain(data.map(function(d) { return d.name; }));
  y.domain([0, d3.max(data, function(d) { return d.value; })]);

svg.append("text")
      .attr("class", "title")
      .attr("x", x(data[0].name))
      .attr("y", -26)
      .text("Why Are We Leaving Facebook?");

svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)
    .selectAll(".tick text")
      .call(wrap, x.rangeBand());

svg.append("g")
      .attr("class", "y axis")
      .call(yAxis);

svg.selectAll(".bar")
      .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.name); })
      .attr("width", x.rangeBand())
      .attr("y", function(d) { return y(d.value); })
      .attr("height", function(d) { return height - y(d.value); });
});

function wrap (text, width) {

text.each(function() {

var breakChars = ['/', '&', '-'],
      text = d3.select(this),
      textContent = text.text(),
      spanContent;

breakChars.forEach(char => {
      // Add a space after each break char for the function to use to determine line breaks
      textContent = textContent.replace(char, char + ' ');
    });

var words = textContent.split(/\s+/).reverse(),
      word,
      line = [],
      lineNumber = 0,
      lineHeight = 1.1, // ems
      x = text.attr('x'),
      y = text.attr('y'),
      dy = parseFloat(text.attr('dy') || 0),
      tspan = text.text(null).append('tspan').attr('x', x).attr('y', y).attr('dy', dy + 'em');

while (word = words.pop()) {
      line.push(word);
      tspan.text(line.join(' '));
      if (tspan.node().getComputedTextLength() > width) {
        line.pop();
        spanContent = line.join(' ');
        breakChars.forEach(char => {
          // Remove spaces trailing breakChars that were added above
          spanContent = spanContent.replace(char + ' ', char);
        });
        tspan.text(spanContent);
        line = [word];
        tspan = text.append('tspan').attr('x', x).attr('y', y).attr('dy', ++lineNumber * lineHeight + dy + 'em').text(word);
      }
    }
  });

}

function type(d) {
  d.value = +d.value;
  return d;
}

</script>

https://d3js.org/d3.v3.min.js