In response to a Stack Overflow question, How to convert to D3's JSON format?.
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Tree Layout from CSV
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| license: gpl-3.0 |
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| source | target | |
|---|---|---|
| A1 | A2 | |
| A2 | A3 | |
| A2 | A4 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .link { | |
| fill: none; | |
| stroke: #000; | |
| } | |
| .node { | |
| stroke: #fff; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var margin = {top: 40, right: 40, bottom: 40, left: 40}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| var tree = d3.layout.tree() | |
| .size([height, width]); | |
| var diagonal = d3.svg.diagonal() | |
| .projection(function(d) { return [d.y, d.x]; }); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| d3.csv("graph.csv", function(error, links) { | |
| if (error) throw error; | |
| var nodesByName = {}; | |
| // Create nodes for each unique source and target. | |
| links.forEach(function(link) { | |
| var parent = link.source = nodeByName(link.source), | |
| child = link.target = nodeByName(link.target); | |
| if (parent.children) parent.children.push(child); | |
| else parent.children = [child]; | |
| }); | |
| // Extract the root node and compute the layout. | |
| var nodes = tree.nodes(links[0].source); | |
| // Create the link lines. | |
| svg.selectAll(".link") | |
| .data(links) | |
| .enter().append("path") | |
| .attr("class", "link") | |
| .attr("d", diagonal); | |
| // Create the node circles. | |
| svg.selectAll(".node") | |
| .data(nodes) | |
| .enter().append("circle") | |
| .attr("class", "node") | |
| .attr("r", 4.5) | |
| .attr("cx", function(d) { return d.y; }) | |
| .attr("cy", function(d) { return d.x; }); | |
| function nodeByName(name) { | |
| return nodesByName[name] || (nodesByName[name] = {name: name}); | |
| } | |
| }); | |
| </script> |
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