D3.js labeled force graph does not reload data - d3.js

Question

I am trying to create a force graph in d3.js with some labels on top of each node and also some content-dependent style (for instance, the colour of the node is dependent on a 'type' property). I am starting with one of the examples but I cannot make the graph to display new data when I update it. For instance, when changing the text property on the list of data, the label on the node should change, however it does not. I think the problem might be in the data()/enter() procedure, which I am still trying to fully understand. What I have so far managed to get is the following: https://jsfiddle.net/5Luv0btd/2/ . Any help would be much appreciated!

Answer 1

That is because once you've entered the data, you do not have to operate on the nodeEnter anymore. The reason is simple: .enter() merges into the update selection when you append or insert.. In other words, after chaining .enter(), node effectively refers to both the old and new data. Citing the example for the v3.x documentation for d3:
var update_sel = svg.selectAll("circle").data(data)
update_sel.attr(/* operate on old elements only */)
update_sel.enter().append("circle").attr(/* operate on new elements only */)
update_sel.attr(/* operate on old and new elements */)
update_sel.exit().remove() /* complete the enter-update-exit pattern */
Therefore, working with node itself will suffice, i.e.:
// Enter selection
node.enter().append("g")
.attr("class", "node")
.call(drag);
// From this point onwards:
// `node` will refer to both old and new data
// Do magic ;)
node.append("circle")
.attr("r", 10)
.style('fill', function(d) {
return color(d.type)
})
.attr("width", 16)
.attr("height", 16);
node.append("text")
.attr("dx", 0)
.attr("dy", ".35em")
.text(function(d) {
return d.name
})
.attr("text-anchor", "middle");
See working fiddle here: https://jsfiddle.net/teddyrised/5Luv0btd/5/, or refer to the code snippet below:
var data = {
"nodes": [{
"name": "Myriel",
"type": 1
}, {
"name": "Napoleon",
"type": 1
}, {
"name": "Mlle.Baptistine",
"type": 1
}, {
"name": "Mme.Magloire",
"type": 1
}, {
"name": "CountessdeLo",
"type": 1
}, {
"name": "Geborand",
"type": 1
}, {
"name": "Champtercier",
"type": 1
}, {
"name": "Cravatte",
"type": 1
}, {
"name": "Count",
"type": 1
}, {
"name": "OldMan",
"type": 1
}, {
"name": "Labarre",
"type": 2
}, {
"name": "Valjean",
"type": 2
}, {
"name": "Marguerite",
"type": 3
}, {
"name": "Mme.deR",
"type": 2
}, {
"name": "Isabeau",
"type": 2
}, {
"name": "Gervais",
"type": 2
}, {
"name": "Tholomyes",
"type": 3
}, {
"name": "Listolier",
"type": 3
}, {
"name": "Fameuil",
"type": 3
}, {
"name": "Blacheville",
"type": 3
}, {
"name": "Favourite",
"type": 3
}, {
"name": "Dahlia",
"type": 3
}, {
"name": "Zephine",
"type": 3
}, {
"name": "Fantine",
"type": 3
}, {
"name": "Mme.Thenardier",
"type": 4
}, {
"name": "Thenardier",
"type": 4
}, {
"name": "Cosette",
"type": 5
}, {
"name": "Javert",
"type": 4
}, {
"name": "Fauchelevent",
"type": 0
}, {
"name": "Bamatabois",
"type": 2
}, {
"name": "Perpetue",
"type": 3
}, {
"name": "Simplice",
"type": 2
}, {
"name": "Scaufflaire",
"type": 2
}, {
"name": "Woman1",
"type": 2
}, {
"name": "Judge",
"type": 2
}, {
"name": "Champmathieu",
"type": 2
}, {
"name": "Brevet",
"type": 2
}, {
"name": "Chenildieu",
"type": 2
}, {
"name": "Cochepaille",
"type": 2
}, {
"name": "Pontmercy",
"type": 4
}, {
"name": "Boulatruelle",
"type": 6
}, {
"name": "Eponine",
"type": 4
}, {
"name": "Anzelma",
"type": 4
}, {
"name": "Woman2",
"type": 5
}, {
"name": "MotherInnocent",
"type": 0
}, {
"name": "Gribier",
"type": 0
}, {
"name": "Jondrette",
"type": 7
}, {
"name": "Mme.Burgon",
"type": 7
}, {
"name": "Gavroche",
"type": 8
}, {
"name": "Gillenormand",
"type": 5
}, {
"name": "Magnon",
"type": 5
}, {
"name": "Mlle.Gillenormand",
"type": 5
}, {
"name": "Mme.Pontmercy",
"type": 5
}, {
"name": "Mlle.Vaubois",
"type": 5
}, {
"name": "Lt.Gillenormand",
"type": 5
}, {
"name": "Marius",
"type": 8
}, {
"name": "BaronessT",
"type": 5
}, {
"name": "Mabeuf",
"type": 8
}, {
"name": "Enjolras",
"type": 8
}, {
"name": "Combeferre",
"type": 8
}, {
"name": "Prouvaire",
"type": 8
}, {
"name": "Feuilly",
"type": 8
}, {
"name": "Courfeyrac",
"type": 8
}, {
"name": "Bahorel",
"type": 8
}, {
"name": "Bossuet",
"type": 8
}, {
"name": "Joly",
"type": 8
}, {
"name": "Grantaire",
"type": 8
}, {
"name": "MotherPlutarch",
"type": 9
}, {
"name": "Gueulemer",
"type": 4
}, {
"name": "Babet",
"type": 4
}, {
"name": "Claquesous",
"type": 4
}, {
"name": "Montparnasse",
"type": 4
}, {
"name": "Toussaint",
"type": 5
}, {
"name": "Child1",
"type": 10
}, {
"name": "Child2",
"type": 10
}, {
"name": "Brujon",
"type": 4
}, {
"name": "Mme.Hucheloup",
"type": 8
}],
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"value": 1
}, {
"source": 76,
"target": 63,
"value": 1
}, {
"source": 76,
"target": 62,
"value": 1
}, {
"source": 76,
"target": 48,
"value": 1
}, {
"source": 76,
"target": 58,
"value": 1
}]
};
var width = 960,
height = 500,
color = d3.scale.category20();
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var force = d3.layout.force()
.gravity(0.05)
.distance(100)
.charge(-100)
.size([width, height]);
var draw = function(data) {
force
.nodes(data.nodes)
.links(data.links)
.start();
var drag = d3.behavior.drag().origin(function(d) {
return d;
});
var link = svg.selectAll(".link")
.data(data.links);
var linkEnter = link.enter().append("line")
.attr("class", "link");
var node = svg.selectAll(".node")
.data(data.nodes, function(d) {
return d.name
});
node.enter().append("g")
.attr("class", "node")
.call(drag);
node.append("circle")
.attr("r", 10)
.style('fill', function(d) {
return color(d.type)
})
.attr("width", 16)
.attr("height", 16);
node.append("text")
.attr("dx", 0)
.attr("dy", ".35em")
.text(function(d) {
return d.name
})
.attr("text-anchor", "middle");
link.exit().remove();
node.exit().remove();
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("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
});
}
draw(data);
setTimeout(function(d) {
data.nodes[0].name = "A changed name";
data.nodes[0].type = 2;
// The node 'Myriel' should now have the labed 'A changed name'
draw(data)
}, 2000);
.link {
stroke: #ccc;
}
.node text {
pointer-events: none;
font: 10px sans-serif;
}
<script src="//d3js.org/d3.v3.min.js"></script>