Custom Tooltip Contents

The Tooltip class has body, footer, and title methods that accept valid HTML strings as the return value to be rendered inside of the tooltip. These methods are accessible through the tooltipConfig method of a visualization.

Additionally, when using these methods in conjunction with a visualization, like the Treemap generated here, each function is passed the current data point being interacted with, allowing the returned HTML to contain data specific to the current user interaction.

.tooltip-table {
  width: 100%;

.tooltip-table .data {
  text-align: right;

.tooltip-footer {
  opacity: 0.5;
var data = [
  {id: "alpha", value: 29, year: 2010},
  {id: "beta",  value: 10, year: 2010},
  {id: "gamma", value: 2,  year: 2010},
  {id: "delta", value: 29, year: 2010},
  {id: "eta",   value: 25, year: 2010}

new d3plus.Treemap()
    body: function(d) {
      var table = "<table class='tooltip-table'>";
      table += "<tr><td class='title'>Year:</td><td class='data'>" + d.year + "</td></tr>";
      table += "<tr><td class='title'>Value:</td><td class='data'>" + d.value + "</td></tr>";
      table += "</table>";
      return table;
    footer: function(d) {
      return "<sub class='tooltip-footer'>Data Collected in 2012</sub>";
    title: function(d) {
      var txt =;
      return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();;