D3 Force Directed Map Source and Target Properties - d3.js

Question

Is it possible to use names other than source and target for a D3 Force Directed Map? I am connecting to an API that provides me with the needed information but they are supplying it as 'src-port' and 'dst-port'. If I change the names in a static JSON file to 'source' and 'target' the links on my map appear. If I leave it as is, I get the following error message:
e.source is undefined
Is there a way I can specify what property names to look for instead of using the defaults, 'source' and 'target'?
Here is the complete code to work with:
function buildMap(node, ids, mode) {
d3.select("svg").remove();
width = 960,
height = 500;
svg = d3.select(node).append("svg")
.attr("width", width)
.attr("height", height)
.attr("id","chart")
.attr("preserveAspectRatio","xMidYMid")
.attr("viewBox","0 0 960 500");
var color = d3.scale.category20();
var force = d3.layout.force()
.charge(-220)
.linkDistance(40)
.size([width, height]);
var tip = d3.tip()
.attr('class', 'd3-tip')
.offset([-10, 0])
.html(function (d) {
return "<strong>DPID:</strong> <span style='color:red'>" + d.dpid + "</span><br />" + "<strong>Type:</strong> <span style='color:red'>" + d.type + "</span>";
})
svg.call(tip);
//d3.json("http://192.168.1.82:9000/wm/onos/topology", function(error, graph) {
d3.json("http://localhost:9001/data/nodes.json", function(error, graph) {
force
.nodes(graph.switches)
.links(graph.links.forEach(function(l) {
l.source = l["src-port"];
l.target = l["dst-port"];
})
)
.on("tick", tick)
.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.switches)
.enter().append("circle")
.attr("class", function(d) {
//if(d.type == undefined) {
return "node";
//} else {
// return d.type;
//}
})
.attr("r", function(d) {
//if(d.type == undefined) {
return 5;
//} else {
// switch(d.type) {
// case "core":
// return 10;
// break;
// case "agg":
// return 8;
// break;
// default:
// return 5;
// }
//}
})
.style("fill", function(d) {
//var count = ids.length;
//if(count <= 0)
// return d.color;
var color = "#15a9ff";
//if(d3.select(this).style("fill") == color){
// for (i = 0; i <= count; i++) {
// if(ids[i] != undefined) {
// if(ids[i].attributes.id == d.instance_id) {
// color = d.color;
// }
// }
// }
return color;
// }
}
)
.on('mouseover', tip.show)
.on('mouseout', tip.hide)
.call(force.drag)
.on("click", function (d) {
enyo.Signals.send("onNodeSelected", d);
});
//node.append("title")
// .text(function(d) { return d.name; });
function tick(e) {
//if(mode == "tree") {
// var k = 6 * e.alpha;
// graph.links.forEach(function(d, i) {
// d.source.y -= k;
// d.target.y += k;
// });
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
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; });
//} else {
// 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; });
}
//}
});
}

Answer 1

There is no way to do this through the API; you would have to modify the source. One easy way of dealing with this is to simply copy the values in src-port and dst-port into source and target:
links.forEach(function(l) {
l.source = l.src-port;
l.target = l.dst-port;
});