Counties of the United Kingdom

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    <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@12.10.3/d3.csv.js"></script>
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rect {
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</style>
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    <h1>Counties of the United Kingdom</h1>
    <p>A demonstration of using CSV data for treemaps, at the request of <a href="https://github.com/blackbird25">blackbird25</a>.  Click to zoom!
    <div id="body"></div>
    <p>Treemap zooming based on <a href="https://mbostock.github.com/d3/talk/20111018/#23">a slide</a> by <a href="https://bost.ocks.org/mike">Mike Bostock</a>.
    <p class="source">Data source: <a href="https://blog.acmultimedia.co.uk/2007/09/list-of-uk-counties-in-sql-csv-format/">acmultimedia</a>.

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    y = d3.scale.linear().range([0, h]),
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    root,
    node;

var treemap = d3.layout.treemap()
    .round(false)
    .size([w, h])
    .sticky(true)
    .children(function(d) { return d.values; })
    .value(function(d) { return 1; });

var svg = d3.select("#body").append("svg:svg")
    .attr("width", w)
    .attr("height", h)
  .append("svg:g")
    .attr("transform", "translate(.5,.5)");

d3.csv("uk-counties.csv", function(data) {
  node = root = {values: d3.nest()
      .key(function(d) { return d.Country; })
      .rollup(function(d) {
        return d.map(function(d) {
          return {key: d.County};
        });
      })
      .entries(data)};

var nodes = treemap.nodes(root)
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var cell = svg.selectAll("g")
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      .attr("class", "cell")
      .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
      .on("click", function(d) { return zoom(node == d.parent ? root : d.parent); });

cell.append("svg:rect")
      .attr("width", function(d) { return d.dx - 1; })
      .attr("height", function(d) { return d.dy - 1; })
      .style("fill", function(d) { return color(d.parent.key); });

cell.append("svg:text")
      .attr("x", function(d) { return d.dx / 2; })
      .attr("y", function(d) { return d.dy / 2; })
      .attr("dy", ".35em")
      .attr("text-anchor", "middle")
      .text(function(d) { return d.key; })
      .style("opacity", function(d) { d.w = this.getComputedTextLength(); return d.dx > d.w ? 1 : 0; });

d3.select(window).on("click", function() { zoom(root); });

});

function zoom(d) {
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      .attr("transform", function(d) { return "translate(" + x(d.x) + "," + y(d.y) + ")"; });

t.select("rect")
      .attr("width", function(d) { return kx * d.dx - 1; })
      .attr("height", function(d) { return ky * d.dy - 1; })

t.select("text")
      .attr("x", function(d) { return kx * d.dx / 2; })
      .attr("y", function(d) { return ky * d.dy / 2; })
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node = d;
  d3.event.stopPropagation();
}

</script>
  </body>
</html>

Modified http://mbostock.github.com/d3/d3.js to a secure url

Modified http://mbostock.github.com/d3/d3.csv.js to a secure url

Modified http://mbostock.github.com/d3/d3.layout.js to a secure url

https://mbostock.github.com/d3/d3.js

https://mbostock.github.com/d3/d3.csv.js

https://mbostock.github.com/d3/d3.layout.js