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HTML 

              
                <div id='header'>
  <h1 id="title">A big ol Graph</h1>
  <p id='description'>A big looooooooooooooonnnnnggg description</p>
  <div class='data_select'>
    <button class='data_select-button data_select_0 active' onClick='changeData(0)'>
      Kickstarter Data
    </button>
    <button class='data_select-button data_select_1' onClick='changeData(1)'>
      Movie Data
    </button>
    <button class='data_select-button data_select_2' onClick='changeData(2)'>
      Video Game Data
    </button>
  </div>
</div>
<div id='root'></div>
<div id='source'></div>
<div id='legend'></div>

<!-- <script src='https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js'></script> -->
!

CSS 

              
                * {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

#header {
  text-align: center;
}

#root {
  margin: auto;
  position: relative;
  width: 960px;
/*   border: 3px dashed tomato; */
}

#legend {
  text-align: center;
  margin-top: 20px;
}

g {
  overflow: hidden;
}

.tile {
  border: 1px solid white;
  font: 10px sans-serif;
  line-height: 12px;
  overflow: hidden;
  position: absolute;
  text-indent: 2px;
  background: steelblue;
}

text {
  cursor: default;
}

.tooltip_text {
  fill: black;
  font-size: 0.8em;
}

button {
  margin: 0px 5px 20px 5px;
  font-size: 1.1em;
  padding: 5px 10px;
  cursor: pointer;
  background-color: #fff;
  border: 2px solid #29B6F6;
  border-radius: 10px;
  transition: 0.2s linear;
  box-shadow: 5px 5px 10px rgba(0,0,0,0.1);
}

button:hover {
  background-color: #B2E8F7;
}

button:active, button.active:active {
  background-color: #42A5F5;
  color: #fff;
  box-shadow: 2px 2px 10px rgba(0,0,0,0.1);
}

button.active {
  background-color: #64B5F6;
  color: #ecf0f1;
  box-shadow: 3px 3px 10px rgba(0,0,0,0.1);
}

#source {
  font-size: 1em;
  text-align: center;
  color: #bec3c7;
  padding: 10px;
}
!

JS 

              
                console.clear();

const kickstarter_url = "https://cdn.rawgit.com/freeCodeCamp/testable-projects-fcc/a80ce8f9/src/data/tree_map/kickstarter-funding-data.json"
const movie_url = "https://cdn.rawgit.com/freeCodeCamp/testable-projects-fcc/a80ce8f9/src/data/tree_map/movie-data.json"
const games_url = "https://cdn.rawgit.com/freeCodeCamp/testable-projects-fcc/a80ce8f9/src/data/tree_map/video-game-sales-data.json"

const data_arr = [kickstarter_url, movie_url, games_url];
var data_selected = 0
const headers = [
  {name: 'Kickstarter Projects', desc: 'The top 100 pledged Kickstarter projects'},
  {name: 'Movie Sales', desc: 'The top videogames by sales, aranged by genre'},
  {name: 'Video Game Sales', desc: 'The most popular movies by sales, aranged by genre'}
]

function render() {
  console.log('rendering...')
  
$.getJSON(data_arr[data_selected], data => {
  console.log("=========================")
  
  const width   = 960,
        height  = 500;

  const color = d3.scaleOrdinal().range(d3.schemeCategory20c)

  const treemap = d3.treemap().size([width, height])//.paddingOuter(5).paddingInner(3);
  
  d3.select('#title').text(headers[data_selected].name)
  d3.select('#description').text(headers[data_selected].desc)
  d3.select('#source').text('Source: ' + data_arr[data_selected])
  
  d3.select('#root')
    .selectAll('*')
    .remove()

  const svg = d3.select('#root')
                 .append('svg')
                 .style('position', 'relative')
                 .style('width', width + 'px')
                 .style('height', height + 'px')

  const root = d3.hierarchy(data, d => d.children)
                 .sum(d => d.value);

  const tree = treemap(root)

  const node = svg.datum(root)
                  .selectAll('.node')
                  .data(tree.leaves())
                  .enter()
                  .append('g')
  
                  .on('mouseover', function (d) {
                    tooltip
                     .style('opacity', 1)//.attr('display', null)
                    tooltip.attr('data-value', d.data.value)
                    var tooltip_width = Math.max(d.data.name.length * 8, `Value: ${d.data.value}`.length * 8)
                    
                    var x = d3.mouse(this)[0] > width - 200 ? 
                                d3.mouse(this)[0] - 25 - tooltip_width : 
                                d3.mouse(this)[0] + 25;
                    
                    var y =  d3.mouse(this)[1] > height - 200 ? 
                                d3.mouse(this)[1] - 100 : 
                                d3.mouse(this)[1];
                    
                    tooltip.attr('transform', `translate(${x}, ${y})`)
                    tooltip_name.text(d.data.name)
                    tooltip_catt.text(`Category: ${d.data.category}`)
                    tooltip_value.text(`Value: ${d.data.value}`)
                    tooltip_back.attr('width', tooltip_width)
                  })
                  .on('mousemove', function (d) {
                    var tooltip_width = Math.max(d.data.name.length * 8, `Value: ${d.data.value}`.length * 8)
                    
                    var x = d3.mouse(this)[0] > width - 200 ? 
                                d3.mouse(this)[0] - 25 - tooltip_width : 
                                d3.mouse(this)[0] + 25;
                    
                    var y =  d3.mouse(this)[1] > height - 70 ? 
                                d3.mouse(this)[1] - 50 : 
                                d3.mouse(this)[1];
                    
                    tooltip.attr('transform', `translate(${x}, ${y})`)
                  })
                  .on('mouseout', function () {
                    tooltip//.attr('display', 'none')
                     .style('opacity', 0)
                  })
  
const node_rect =  node.append('rect')
                        .attr('class', 'tile')
                        .style('x', d => d.x0)
                        .style('y', d => d.y0)
                        .style('width', d => Math.max(0, d.x1 - d.x0 - 1) + 'px')
                        .style('height', d => Math.max(0, d.y1 - d.y0 - 1) + 'px')
                        .style('fill', d => color(d.parent.data.name))
                        // .text(d => d.data.name);
                        .attr('data-name', d => d.data.name)
                        .attr('data-category', d => d.data.category)
                        .attr('data-value', d => d.data.value)
  
  const node_text = node.append('text')
                        // .text(d => d.data.name)
                        .attr('x', d => d.x0)
                        .attr('y', d => d.y0)
                        .attr("fill", "black")
                        .attr("font-size", "0.6em")
                        .attr("transform", "translate(4, 10)")
                        
  const node_text_tspan = node_text.selectAll('tspan')
                                   .data(d => d.data.name.split(' ').map(each => ({ name: each, x0: d.x0, y0: d.y0 })))
                                   .enter()
                                   .append('tspan')
                                   .text(d => d.name)
                                   .attr('x', d => d.x0)
                                   .attr('y', (d, i) => d.y0 + (i * 10))
                                   // .style('transform', (d, i) => `translate(0px, ${i * 4}px)`)
  
  // translate inside a tspan does nothing
  // cannot put a 'text' inside a 'rect'
  
  const tooltip = svg.append('g')
                     .style('opacity', 0)
                     // .attr('display', 'none')
                     .attr('transform', 'translate(50, 50)')
                     .attr('id', 'tooltip')
  
  const tooltip_back = tooltip.append('rect')
                              .attr('stroke', '#000000')
                              .attr('fill', '#fff')
                              .attr('width', '150px')
                              .attr('height', '60px')
  
  const tooltip_name = tooltip.append('text')
                              .text('Wii Sports Resort')
                              .attr('class', 'tooltip_text')
                              .style('transform', 'translate(4px, 15px)')
                                    // .attr("text-anchor", "middle");
  
  const tooltip_catt = tooltip.append('text')
                              .text('Cattegory: Wii')
                              .attr('class', 'tooltip_text')
                              .style('transform', 'translate(4px, 30px)')
                                    // .attr("text-anchor", "middle");
  
  const tooltip_value = tooltip.append('text')
                              .text('Value: 5.28')
                              .attr('class', 'tooltip_text')
                              .style('transform', 'translate(4px, 45px)')
                                    // .attr("text-anchor", "middle");
  
  const key_data = d3.set(data.children.map(each => each.name))
  
  d3.select('#legend').selectAll('*').remove()
  
  var legend_width = 700
  
  const legend_svg = d3.select('#legend')
                        .append('svg')
                        .attr('width', legend_width)
                        // .style('border', '1px dashed tomato')
  
  const legend_item = legend_svg.append('g')
                                .selectAll('g')
                                .data(root.children)
                                .enter()
                                .append('g')
                                .attr('transform', (d, i) => {
                                  var col = i % 3 == 0 ? 0 : (i+2) % 3 == 0 ? 1 : 2;
                                  return `translate(${(col * (legend_width/3)) + 50}, ${(Math.floor(i/3) * 20) + 20})`
                                })
                                
                     legend_item.append('text')
                                .text(d => d.data.name)
                                // .attr('text-anchor', 'middle')
  
  const legend_icon = legend_item.append('rect')
                                .attr('class', 'legend-item')
                                  .attr('width', 15)
                                  .attr('height', 15)
                                  .attr('fill', d => color(d.data.name))
                                  .attr('transform', 'translate(-25, -13)')
  
});
  
  
}

render()

function changeData (num) {
  data_selected = num
  render()
  $('button').removeClass('active')
  $(`.data_select_${num}`).addClass('active')
}
!
999px

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