Summing up the weight of all edges to a node in D3.js?

Question

I want to sum up the weight of all edges connected to a node and use it as the node score? The sum would be an array where than I would need to order them from the highest node with more edges to the lowest one. By the way I am using force layout in D3.

Thank you.

So far:

var sum=[]
            edges.style("stroke", function(d, i) {

                if ((d.source.name == node_name)  ||  (d.target.name == node_name))

                {   dataset.nodes.push(function(d){
                    //console.log(d.name)
                    return {sum:d.name}});

                    sum+= d.weight;
                    //console.log(d3.max(sum))
                    return  "#000"}
                else
                {
                    return "#ccc"}

            });

        })

Answer 1

As you're loading your data with d3.json , one approach would be to calculate the score directly after the data is loaded and not on click like in your fiddle. If your data is formatted like this example , then the following code stores the score of each node as score attribute on the node. Maybe you have to adjust the attribute names nodes , links , source , target , score and value according to your dataset.

d3.json("assignments.json", function(error, graph) {
  graph.nodes = graph.nodes.map(function(node, index){
    node.score = graph.links
      .filter(function(d){
        return (d.source === index || d.target === index);
      })
      .map(function(d){
        return d.value;
      })
      .reduce(function(prev, curr){
        return prev + curr;
      },0);
    return node;
  });
/**
 * init force here
 */
});