chart = {
const root = stratify(table);
root.x0 = dy / 2;
root.y0 = 0;
root.descendants().forEach((d, i) => {
d.id = i;
d._children = d.children;
if (d.depth && d.data.name.length !== 7) d.children = null;
});
const svg = d3.create("svg")
.attr("viewBox", [-margin.left, -margin.top, width, dx])
// Changes text size and font
.style("font", "15px sans-serif")
.style("font-weight", "bold")
.style("user-select", "none");
const gLink = svg.append("g")
.attr("fill", "none")
// Changes line color and width
.attr("stroke", "#999999")
.attr("stroke-opacity", 1)
.attr("stroke-width", 3);
const gNode = svg.append("g")
.attr("cursor", "pointer")
.attr("pointer-events", "all");
function update(source) {
const duration = d3.event && d3.event.altKey ? 2500 : 250;
const nodes = root.descendants().reverse();
const links = root.links();
// Compute the new tree layout.
tree(root);
let left = root;
let right = root;
root.eachBefore(node => {
if (node.x < left.x) left = node;
if (node.x > right.x) right = node;
});
const height = 700
// const height = right.x - left.x + margin.top + margin.bottom;
const transition = svg.transition()
.duration(duration)
.attr("viewBox", [-margin.left, left.x - margin.top, width, height])
.tween("resize", window.ResizeObserver ? null : () => () => svg.dispatch("toggle"));
// Update the nodes…
const node = gNode.selectAll("g")
.data(nodes, d => d.id);
// Enter any new nodes at the parent's previous position.
const nodeEnter = node.enter().append("g")
.attr("transform", d => `translate(${source.y0},${source.x0})`)
.attr("fill-opacity", 0)
.attr("stroke-opacity", 0)
.on("click", (event, d) => {
d.children = d.children ? null : d._children;
update(d);
});
// Add circles, make circles clickable links if endpoints
nodeEnter
.append("a")
.attr("href", d=>d._children ? null : "https://www.unlockingtheairwaves.org/" + d.data.urlcomponent)
.attr("target","_blank")
.append("circle")
// .attr("class","clickable")
// .attr("cx",0)
// .attr("cy",0)
.attr("r",6)
.attr("fill", d => d._children ? "#839711" : "#000000")
.attr("stroke-width", 10);
nodeEnter.append("text")
.attr("dy", "0.31em")
.attr("x", 10)
.attr("text-anchor", "start")
.attr("font-weight", d => d._children ? "bold" : "normal")
.text(d => d.data.name)
.clone(true).lower()
.attr("stroke-linejoin", "round")
.attr("stroke-width", 3)
.attr("stroke", "white");
// Transition nodes to their new position.
const nodeUpdate = node.merge(nodeEnter).transition(transition)
.attr("transform", d => `translate(${d.y},${d.x})`)
.attr("fill-opacity", 1)
.attr("stroke-opacity", 1);
// Transition exiting nodes to the parent's new position.
const nodeExit = node.exit().transition(transition).remove()
.attr("transform", d => `translate(${source.y},${source.x})`)
.attr("fill-opacity", 0)
.attr("stroke-opacity", 0);
// Update the links…
const link = gLink.selectAll("path")
.data(links, d => d.target.id);
// Enter any new links at the parent's previous position.
const linkEnter = link.enter().append("path")
.attr("d", d => {
const o = {x: source.x0, y: source.y0};
return diagonal({source: o, target: o});
});
// Transition links to their new position.
link.merge(linkEnter).transition(transition)
.attr("d", diagonal);
// Transition exiting nodes to the parent's new position.
link.exit().transition(transition).remove()
.attr("d", d => {
const o = {x: source.x, y: source.y};
return diagonal({source: o, target: o});
});
// Stash the old positions for transition.
root.eachBefore(d => {
d.x0 = d.x;
d.y0 = d.y;
});
}
update(root);
return svg.node();
}
Setup for the tree
diagonal = d3.linkHorizontal().x(d => d.y).y(d => d.x)
tree = d3.tree().nodeSize([dx, dy])
dx = 25
dy = 225
margin = ({top: 20, right: 100, bottom: 20, left: 40})
d3 = require("d3@6")
Importing and parsing the CSV to hierarchy
text = FileAttachment("Content Standard Links-Observable@4.csv").text()
table = d3.csvParse(text)
stratify = d3.stratify()
.id(d => d[table.columns[0]])
.parentId(d => d[table.columns[1]])
data = stratify(table)
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