For example https://observablehq.com/@d3/zoomable-treemap
If you paste the fragments of script into a <script> tag in a HTML file the (obviously) it doesn't work.
How are you supposed to run these things?
And what the heck is italic f?
Why are no statements terminated with a semicolon and why are things declared without var?
Surely this cannot possibly work?
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<!-- Load d3.js -->
<script src="https://d3js.org/d3.v4.js"></script>
</head>
<body>
<h1>H1</h1?
<!-- Create a div where the graph will take place -->
<div id="my_dataviz"></div>
<script type="text/javascript">
chart = {
const x = d3.scaleLinear().rangeRound([0, width]);
const y = d3.scaleLinear().rangeRound([0, height]);
const svg = d3.create("svg")
.attr("viewBox", [0.5, -30.5, width, height + 30])
.style("font", "10px sans-serif");
let group = svg.append("g")
.call(render, treemap(data));
function render(group, root) {
const node = group
.selectAll("g")
.data(root.children.concat(root))
.join("g");
node.filter(d => d === root ? d.parent : d.children)
.attr("cursor", "pointer")
.on("click", d => d === root ? zoomout(root) : zoomin(d));
node.append("title")
.text(d => `${name(d)}\n${format(d.value)}`);
node.append("rect")
.attr("id", d => (d.leafUid = DOM.uid("leaf")).id)
.attr("fill", d => d === root ? "#fff" : d.children ? "#ccc" : "#ddd")
.attr("stroke", "#fff");
node.append("clipPath")
.attr("id", d => (d.clipUid = DOM.uid("clip")).id)
.append("use")
.attr("xlink:href", d => d.leafUid.href);
node.append("text")
.attr("clip-path", d => d.clipUid)
.attr("font-weight", d => d === root ? "bold" : null)
.selectAll("tspan")
.data(d => (d === root ? name(d) : d.data.name).split(/(?=[A-Z][^A-Z])/g).concat(format(d.value)))
.join("tspan")
.attr("x", 3)
.attr("y", (d, i, nodes) => `${(i === nodes.length - 1) * 0.3 + 1.1 + i * 0.9}em`)
.attr("fill-opacity", (d, i, nodes) => i === nodes.length - 1 ? 0.7 : null)
.attr("font-weight", (d, i, nodes) => i === nodes.length - 1 ? "normal" : null)
.text(d => d);
group.call(position, root);
}
function position(group, root) {
group.selectAll("g")
.attr("transform", d => d === root ? `translate(0,-30)` : `translate(${x(d.x0)},${y(d.y0)})`)
.select("rect")
.attr("width", d => d === root ? width : x(d.x1) - x(d.x0))
.attr("height", d => d === root ? 30 : y(d.y1) - y(d.y0));
}
// When zooming in, draw the new nodes on top, and fade them in.
function zoomin(d) {
const group0 = group.attr("pointer-events", "none");
const group1 = group = svg.append("g").call(render, d);
x.domain([d.x0, d.x1]);
y.domain([d.y0, d.y1]);
svg.transition()
.duration(750)
.call(t => group0.transition(t).remove()
.call(position, d.parent))
.call(t => group1.transition(t)
.attrTween("opacity", () => d3.interpolate(0, 1))
.call(position, d));
}
// When zooming out, draw the old nodes on top, and fade them out.
function zoomout(d) {
const group0 = group.attr("pointer-events", "none");
const group1 = group = svg.insert("g", "*").call(render, d.parent);
x.domain([d.parent.x0, d.parent.x1]);
y.domain([d.parent.y0, d.parent.y1]);
svg.transition()
.duration(750)
.call(t => group0.transition(t).remove()
.attrTween("opacity", () => d3.interpolate(1, 0))
.call(position, d))
.call(t => group1.transition(t)
.call(position, d.parent));
}
return svg.node();
}
data = FileAttachment("flare-2.json").json()
treemap = data => d3.treemap()
.tile(tile)
(d3.hierarchy(data)
.sum(d => d.value)
.sort((a, b) => b.value - a.value))
function tile(node, x0, y0, x1, y1) {
d3.treemapBinary(node, 0, 0, width, height);
for (const child of node.children) {
child.x0 = x0 + child.x0 / width * (x1 - x0);
child.x1 = x0 + child.x1 / width * (x1 - x0);
child.y0 = y0 + child.y0 / height * (y1 - y0);
child.y1 = y0 + child.y1 / height * (y1 - y0);
}
}
name = d => d.ancestors().reverse().map(d => d.data.name).join("/")
width = 954
height = 924
format = d3.format(",d")
d3 = require("d3@5")
</script>
</body>
</html>