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<!DOCTYPE html> |
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<html lang="en"> |
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<head> |
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<meta charset="utf-8"> |
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<title>Collapsible Tree Example</title> |
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<style> |
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.node circle { |
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fill: #fff; |
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stroke: steelblue; |
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stroke-width: 3px; |
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} |
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.node text { font: 12px sans-serif; } |
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.link { |
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fill: none; |
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stroke: #ccc; |
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stroke-width: 2px; |
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} |
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</style> |
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</head> |
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<body> |
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<!-- load the d3.js library --> |
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<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script> |
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<script> |
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// ************** Generate the tree diagram ***************** |
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var margin = {top: 20, right: 120, bottom: 20, left: 120}, |
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width = 960 - margin.right - margin.left, |
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height = 500 - margin.top - margin.bottom; |
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var i = 0; |
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var tree = d3.layout.tree() |
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.size([height, width]); |
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var diagonal = d3.svg.diagonal() |
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.projection(function(d) { return [d.y, d.x]; }); |
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var svg = d3.select("body").append("svg") |
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.attr("width", width + margin.right + margin.left) |
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.attr("height", height + margin.top + margin.bottom) |
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.append("g") |
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.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); |
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// load the external data |
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d3.csv("treedata.csv", function(error, data) { |
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// *********** Convert flat data into a nice tree *************** |
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// create a name: node map |
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var dataMap = data.reduce(function(map, node) { |
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map[node.name] = node; |
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return map; |
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}, {}); |
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// create the tree array |
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var treeData = []; |
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data.forEach(function(node) { |
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// add to parent |
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var parent = dataMap[node.parent]; |
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if (parent) { |
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// create child array if it doesn't exist |
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(parent.children || (parent.children = [])) |
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// add node to child array |
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.push(node); |
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} else { |
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// parent is null or missing |
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treeData.push(node); |
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} |
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}); |
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root = treeData[0]; |
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update(root); |
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}); |
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function update(source) { |
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// Compute the new tree layout. |
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var nodes = tree.nodes(root).reverse(), |
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links = tree.links(nodes); |
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// Normalize for fixed-depth. |
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nodes.forEach(function(d) { d.y = d.depth * 180; }); |
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// Declare the nodes… |
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var node = svg.selectAll("g.node") |
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.data(nodes, function(d) { return d.id || (d.id = ++i); }); |
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// Enter the nodes. |
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var nodeEnter = node.enter().append("g") |
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.attr("class", "node") |
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.attr("transform", function(d) { |
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return "translate(" + d.y + "," + d.x + ")"; }); |
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nodeEnter.append("circle") |
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.attr("r", 10) |
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.style("fill", "#fff"); |
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nodeEnter.append("text") |
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.attr("x", function(d) { |
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return d.children || d._children ? -13 : 13; }) |
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.attr("dy", ".35em") |
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.attr("text-anchor", function(d) { |
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return d.children || d._children ? "end" : "start"; }) |
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.text(function(d) { return d.name; }) |
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.style("fill-opacity", 1); |
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// Declare the links… |
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var link = svg.selectAll("path.link") |
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.data(links, function(d) { return d.target.id; }); |
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// Enter the links. |
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link.enter().insert("path", "g") |
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.attr("class", "link") |
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.attr("d", diagonal); |
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} |
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</script> |
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</body> |
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</html> |
How can i make it collapsible ?