title: d3js returning "[object%20Object]" and "Uncaught TypeError: Cannot read property: nodes of undefined"
body: <p>I am new to Javascript and Django. I have to animate a svg file with D3js, so to practice and understand how it works I decided to add <a href="http://bl.ocks.org/mbostock/4062045" rel="nofollow">the miserables widget</a> to my local Django website. I have a simple view:</p>
  
  <pre><code>def miserable(request):
      return render_to_response('index.html')
  </code></pre>
  
  <p>The url is:
  <code>url(r'^moremiser/$','more_miserable')</code>and I copied both index.html and miserable.json into my template folder. When I go to the url that is supposed to display the widget all I get is a blank screen. what am I doing wrong? The person who set up the local website installed tinymce and compressor, could they be causing the problem?
  here is the code for index.html and miserables.json. They both are in my templates folder:</p>
  
  <pre><code>#index.html       
  &lt;!DOCTYPE html&gt;
      &lt;meta charset="utf-8"&gt;
      &lt;style&gt;
  
      .node {
        stroke: #fff;
        stroke-width: 1.5px;
      }
  
      .link {
        stroke: #999;
        stroke-opacity: .6;
      }
  
      &lt;/style&gt;
      &lt;body&gt;
      &lt;script src="http://d3js.org/d3.v3.min.js"&gt;&lt;/script&gt;
      &lt;script&gt;
  
      var width = 960,
          height = 500;
  
      var color = d3.scale.category20();
  
      var force = d3.layout.force()
          .charge(-120)
          .linkDistance(30)
          .size([width, height]);
  
      var svg = d3.select("body").append("svg")
          .attr("width", width)
          .attr("height", height);
  
      d3.json("miserables.json", function(error, graph) {
        force
            .nodes(graph.nodes)
            .links(graph.links)
            .start();
  
        var link = svg.selectAll(".link")
            .data(graph.links)
          .enter().append("line")
            .attr("class", "link")
            .style("stroke-width", function(d) { return Math.sqrt(d.value); });
  
        var node = svg.selectAll(".node")
            .data(graph.nodes)
          .enter().append("circle")
            .attr("class", "node")
            .attr("r", 5)
            .style("fill", function(d) { return color(d.group); })
            .call(force.drag);
  
        node.append("title")
            .text(function(d) { return d.name; });
  
        force.on("tick", function() {
          link.attr("x1", function(d) { return d.source.x; })
              .attr("y1", function(d) { return d.source.y; })
              .attr("x2", function(d) { return d.target.x; })
              .attr("y2", function(d) { return d.target.y; });
  
          node.attr("cx", function(d) { return d.x; })
              .attr("cy", function(d) { return d.y; });
        });
      });
  
  &lt;/script&gt;
  
  #miserables.json
  {
    "nodes":[
      {"name":"Myriel","group":1},
      {"name":"Napoleon","group":1},
      {"name":"Mlle.Baptistine","group":1},
      {"name":"Mme.Magloire","group":1},
      {"name":"CountessdeLo","group":1},
      {"name":"Geborand","group":1},
      {"name":"Champtercier","group":1},
      {"name":"Cravatte","group":1},
      {"name":"Count","group":1},
      {"name":"OldMan","group":1},
      {"name":"Labarre","group":2},
      {"name":"Valjean","group":2},
      {"name":"Marguerite","group":3},
      {"name":"Mme.deR","group":2},
      {"name":"Isabeau","group":2},
      {"name":"Gervais","group":2},
      {"name":"Tholomyes","group":3},
      {"name":"Listolier","group":3},
      {"name":"Fameuil","group":3},
      {"name":"Blacheville","group":3},
      {"name":"Favourite","group":3},
      {"name":"Dahlia","group":3},
      {"name":"Zephine","group":3},
      {"name":"Fantine","group":3},
      {"name":"Mme.Thenardier","group":4},
      {"name":"Thenardier","group":4},
      {"name":"Cosette","group":5},
      {"name":"Javert","group":4},
      {"name":"Fauchelevent","group":0},
      {"name":"Bamatabois","group":2},
      {"name":"Perpetue","group":3},
      {"name":"Simplice","group":2},
      {"name":"Scaufflaire","group":2},
      {"name":"Woman1","group":2},
      {"name":"Judge","group":2},
      {"name":"Champmathieu","group":2},
      {"name":"Brevet","group":2},
      {"name":"Chenildieu","group":2},
      {"name":"Cochepaille","group":2},
      {"name":"Pontmercy","group":4},
      {"name":"Boulatruelle","group":6},
      {"name":"Eponine","group":4},
      {"name":"Anzelma","group":4},
      {"name":"Woman2","group":5},
      {"name":"MotherInnocent","group":0},
      {"name":"Gribier","group":0},
      {"name":"Jondrette","group":7},
      {"name":"Mme.Burgon","group":7},
      {"name":"Gavroche","group":8},
      {"name":"Gillenormand","group":5},
      {"name":"Magnon","group":5},
      {"name":"Mlle.Gillenormand","group":5},
      {"name":"Mme.Pontmercy","group":5},
      {"name":"Mlle.Vaubois","group":5},
      {"name":"Lt.Gillenormand","group":5},
      {"name":"Marius","group":8},
      {"name":"BaronessT","group":5},
      {"name":"Mabeuf","group":8},
      {"name":"Enjolras","group":8},
      {"name":"Combeferre","group":8},
      {"name":"Prouvaire","group":8},
      {"name":"Feuilly","group":8},
      {"name":"Courfeyrac","group":8},
      {"name":"Bahorel","group":8},
      {"name":"Bossuet","group":8},
      {"name":"Joly","group":8},
      {"name":"Grantaire","group":8},
      {"name":"MotherPlutarch","group":9},
      {"name":"Gueulemer","group":4},
      {"name":"Babet","group":4},
      {"name":"Claquesous","group":4},
      {"name":"Montparnasse","group":4},
      {"name":"Toussaint","group":5},
      {"name":"Child1","group":10},
      {"name":"Child2","group":10},
      {"name":"Brujon","group":4},
      {"name":"Mme.Hucheloup","group":8}
    ],
    "links":[
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    ]
  }
  </code></pre>
  
  <p>When I open the Javascript debugger in Google Chrome, I see that instead of going to the url "moremiser" the server try to go to "moremiser/[object%20Object] and then the other error message appears:""Uncaught TypeError: Cannot read property: nodes of undefined". What should I modify?</p>