| license: mit |
This is a simple graph layout for flow
It is derived from the example of https://bl.ocks.org/d3noob/8329404 which was, in turn derived from the Mike Bostock Collapsible tree example but it is a VERY cut down version without the ability to update (collapse).
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Collapsible Tree Example</title> | |
| <style> | |
| .node circle { | |
| fill: #fff; | |
| stroke: steelblue; | |
| stroke-width: 3px; | |
| } | |
| .node text { | |
| font: 12px sans-serif; | |
| } | |
| .link { | |
| fill: none; | |
| stroke: #ccc; | |
| stroke-width: 2px; | |
| } | |
| .link-text{ | |
| font: 10px sans-serif; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <!-- load the d3.js library --> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script> | |
| <script> | |
| var data = [ | |
| { id: 1, "name": "Are you happy today?", "parent": null }, | |
| { id: 2, "name": "Are you currently performing to your potential?", "parent": 1, "parentAnswer": "yes" }, | |
| { id: 3, "name": "Are you healthy?", "parent": 1, "parentAnswer": "no" }, | |
| { id: 4, "name": "Do you think you're getting out enough?", "parent": 2, "parentAnswer": "yes" }, | |
| { id: 5, "name": "Are you getting enough exercise?", "parent": 3, "parentAnswer": "yes" }, | |
| { id: 6, "name": "Have you considered swimming?", "parent": 5, "parentAnswer": "yes" }, | |
| { id: 7, "name": "Would new socks help?", "parent": 2, "parentAnswer": "no" }, | |
| ]; | |
| // *********** Convert flat data into a nice tree *************** | |
| // create a name: node map | |
| var dataMap = data.reduce(function (map, node) { | |
| map[node.id] = node; | |
| return map; | |
| }, {}); | |
| // create the tree array | |
| var treeData = []; | |
| data.forEach(function (node) { | |
| // add to parent | |
| var parent = dataMap[node.parent]; | |
| if (parent) { | |
| // create child array if it doesn't exist | |
| (parent.children || (parent.children = [])) | |
| // add node to child array | |
| .push(node); | |
| } else { | |
| // parent is null or missing | |
| treeData.push(node); | |
| } | |
| }); | |
| // ************** Generate the tree diagram ***************** | |
| var margin = { top: 20, right: 120, bottom: 20, left: 120 }, | |
| width = 1050 - margin.right - margin.left, | |
| height = 500 - margin.top - margin.bottom; | |
| var i = 0; | |
| 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.right + margin.left) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| root = treeData[0]; | |
| update(root); | |
| function update(source) { | |
| // Compute the new tree layout. | |
| var nodes = tree.nodes(root).reverse(), | |
| links = tree.links(nodes); | |
| // Normalize for fixed-depth. | |
| nodes.forEach(function (d) { d.y = d.depth * 180; }); | |
| // Declare the nodes… | |
| var node = svg.selectAll("g.node") | |
| .data(nodes, function (d) { return d.id || (d.id = ++i); }); | |
| // Enter the nodes. | |
| var nodeEnter = node.enter().append("g") | |
| .attr("class", "node") | |
| .attr("transform", function (d) { | |
| return "translate(" + d.y + "," + d.x + ")"; | |
| }); | |
| nodeEnter.append("circle") | |
| .attr("r", 10) | |
| .style("fill", "#fff"); | |
| nodeEnter.append("text") | |
| .attr("x", function (d) { | |
| return d.children || d._children ? 0 : 13; | |
| }) | |
| .attr("dy", "-1.35em") | |
| .attr("text-anchor", function (d) { | |
| return d.children || d._children ? "end" : "start"; | |
| }) | |
| .text(function (d) { return d.name; }) | |
| .style("fill-opacity", 1); | |
| // Declare the links… | |
| var link = svg.selectAll("path.link") | |
| .data(links, function (d) { return d.target.id; }); | |
| // Enter the links. | |
| link.enter().insert("path", "g") | |
| .attr("class", "link") | |
| .attr("d", diagonal); | |
| link.enter().append("text") | |
| .attr("class", "link-text") | |
| .attr("y", function (d) { | |
| return (d.target.x + d.source.x)/2; | |
| }) | |
| .attr("x", function (d) { | |
| return (d.target.y + d.source.y)/2; | |
| }) | |
| .text((d) => { | |
| return d.target.parentAnswer}); | |
| } | |
| </script> | |
| </body> | |
| </html> |
