Getting Sankey diagram in D3 from csv file

StackOverflow https://stackoverflow.com/questions/20476471

Pregunta

I am attempting to create a Sankey diagram from a csv file. I am utilizing code provided by timelyportfolio, and also the code from the d3 site (and even the sample csv files). However, when I try to run the code in Chrome, I am getting a blank Html page, indicating that the code is crashing. I attempted to redirect the source codes to files on my desktop, but I am still running into the same issues. (I am working on a computer with Windows XP)

I have pasted the code below:

    <!DOCTYPE html>
    <meta charset="utf-8">
    <title>SANKEY Experiment</title>
    <style>

    .node rect {
      cursor: move;
      fill-opacity: .9;
      shape-rendering: crispEdges;
    }

    .node text {
      pointer-events: none;
      text-shadow: 0 1px 0 #fff;
    }

    .link {
      fill: none;
      stroke: #000;
      stroke-opacity: .2;
    }

    .link:hover {
      stroke-opacity: .5;
    }

    </style>
    <body>

    <p id="chart">

    <script src="http://d3js.org/d3.v3.js"></script>
    <script src="C:\Documents and Settings\jennifer.ducz\Desktop\sankey.js"></script>
    <script>

    var units = "Units";

    var margin = {top: 10, right: 10, bottom: 10, left: 10},
        width = 1400 - margin.left - margin.right,
        height = 740 - margin.top - margin.bottom;

    var formatNumber = d3.format(",.0f"),    // zero decimal places
        format = function(d) { return formatNumber(d) + " " + units; },
        color = d3.scale.category20();

    // append the svg canvas to the page
    var svg = d3.select("#chart").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 + ")");

    // Set the sankey diagram properties
    var sankey = d3.sankey()
        .nodeWidth(36)
        .nodePadding(10)
        .size([width, height]);

    var path = sankey.link();

    // load the data with d3.csv instead of d3.json
    //for another much simpler example uncomment the below
    d3.csv("C:\Documents and Settings\jennifer.ducz\Desktop\sankey.csv", function(error, data) {
    //d3.csv("d3noob_energy.csv", function(error, data) {
            //set up graph in same style as original example but empty
            graph = {"nodes" : [], "links" : []};

                    data.forEach(function (d) {
                        graph.nodes.push({ "name": d.source });
                        graph.nodes.push({ "name": d.target });

                        graph.links.push({ "source": d.source, "target": d.target, "value": +d.value });
                    });

                    //thanks Mike Bostock https://groups.google.com/d/msg/d3-js/pl297cFtIQk/Eso4q_eBu1IJ
                    //this handy little function returns only the distinct / unique nodes
                    graph.nodes = d3.keys(d3.nest()
                             .key(function (d) { return d.name; })
                             .map(graph.nodes));

                    //it appears d3 with force layout wants a numeric source and target
                    //so loop through each link replacing the text with its index from node
                    graph.links.forEach(function (d, i) {
                        graph.links[i].source = graph.nodes.indexOf(graph.links[i].source);
                        graph.links[i].target = graph.nodes.indexOf(graph.links[i].target);
                    });

                    //now loop through each nodes to make nodes an array of objects rather than an array of strings
                    graph.nodes.forEach(function (d, i) {
                        graph.nodes[i] = { "name": d };
                    });

      sankey
          .nodes(graph.nodes)
          .links(graph.links)
          .layout(32);

    // add in the links
      var link = svg.append("g").selectAll(".link")
          .data(graph.links)
        .enter().append("path")
          .attr("class", "link")
          .attr("d", path)
          .style("stroke-width", function(d) { return Math.max(1, d.dy); })
          .sort(function(a, b) { return b.dy - a.dy; });

    // add the link titles
      link.append("title")
            .text(function(d) {
            return d.source.name + " → " + 
                    d.target.name + "\n" + format(d.value); });

    // add in the nodes
      var node = svg.append("g").selectAll(".node")
          .data(graph.nodes)
        .enter().append("g")
          .attr("class", "node")
          .attr("transform", function(d) { 
              return "translate(" + d.x + "," + d.y + ")"; })
        .call(d3.behavior.drag()
          .origin(function(d) { return d; })
          .on("dragstart", function() { 
              this.parentNode.appendChild(this); })
          .on("drag", dragmove));

    // add the rectangles for the nodes
      node.append("rect")
          .attr("height", function(d) { return d.dy; })
          .attr("width", sankey.nodeWidth())
          .style("fill", function(d) { 
              return d.color = color(d.name.replace(/ .*/, "")); })
          .style("stroke", function(d) { 
              return d3.rgb(d.color).darker(2); })
        .append("title")
          .text(function(d) { 
              return d.name + "\n" + format(d.value); });

    // add in the title for the nodes
      node.append("text")
          .attr("x", -6)
          .attr("y", function(d) { return d.dy / 2; })
          .attr("dy", ".35em")
          .attr("text-anchor", "end")
          .attr("transform", null)
          .text(function(d) { return d.name; })
        .filter(function(d) { return d.x < width / 2; })
          .attr("x", 6 + sankey.nodeWidth())
          .attr("text-anchor", "start");

    // the function for moving the nodes
      function dragmove(d) {
        d3.select(this).attr("transform", 
            "translate(" + (
                   d.x = Math.max(0, Math.min(width - d.dx, d3.event.x))
                ) + "," + (
                       d.y = Math.max(0, Math.min(height - d.dy, d3.event.y))
                ) + ")");
        sankey.relayout();
        link.attr("d", path);
      }
    });

    </script>

    </body>
    </html>

If someone can tell me what I'm doing wrong, please let me know.

Edit: This is the sample data I'm using courtesy of timelyportfolio

source  target  value
    Barry   Elvis   2
    Frodo   Elvis   2
    Frodo   Sarah   2
    Barry   Alice   2
    Elvis   Sarah   2
    Elvis   Alice   2
    Sarah   Alice   4
¿Fue útil?

Solución 2

if you are not using MAMP or any other kind of virtual server, Chrome won't load the csv or any other local files other than the html. Try using a local webserver and everything should be fine

Otros consejos

I've never played with it; however, 1) run your developer tools/console to see exactly which line is crashing the app

2) the following link discusses problems/solutions in formatting the data

http://www.d3noob.org/2013/02/sankey-diagrams-description-of-d3js-code.html

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