Labels / text on the nodes of a D3 force directed graph
14,610
Solution 1
You are adding the text element inside the circle element - try running your code and have a look at the svg with the DOM inspector. I'm not sure text is allowed there. Instead add the text elements separately - like another rendering of the nodes:
var texts = svg.selectAll("text.label")
.data(graph.nodes)
.enter().append("text")
.attr("class", "label")
.attr("fill", "black")
.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; });
texts.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
});
Solution 2
Another option would be to add both circle and text elements inside a g container element as shown below:
var container = svg.selectAll("g.node").data(graph.nodes).enter().append("g")
.attr("class", "node")
.attr("transform", function (d) {
return "translate(" + d.x + "," + d.y + ")";
}).call(force.drag);
container.append("circle")
.attr("r", 5)
.style("fill", color);
container.append("text")
.style("text-anchor", "middle")
.text(function (d) {
return d.name;
});
Here you can play with a working jsfiddle:
Author by
Devester
Updated on June 05, 2022Comments
-
Devester almost 2 years
I still not understanding why the code bellow does not display its labels / text... I have defined the css and set the attribute like the title when the move is over the node:
Json:
{ "nodes":[ {"name":"t1","group":1}, {"name":"t2","group":1}, {"name":"t3","group":1}, {"name":"t4","group":1}, {"name":"hate","group":2}, {"name":"good","group":2}, {"name":"aiport","group":3}, {"name":"flight","group":3} ], "links":[ {"source":0,"target":4,"value":4}, {"source":0,"target":5,"value":4}, {"source":1,"target":4,"value":4}, {"source":2,"target":5,"value":4}, {"source":3,"target":5,"value":4}, {"source":4,"target":6,"value":4}, {"source":5,"target":6,"value":4}, {"source":5,"target":7,"value":4} ] }
Code:
<!DOCTYPE html> <meta charset="utf-8"> <style> .node { fill: #555; stroke: #999; stroke-width: 1.5px; } .link { stroke: #999; stroke-opacity: .6; } </style> <body> <script src="http://d3js.org/d3.v3.min.js"></script> <script> var width = 1024, height = 768; 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("data.json", function(error, graph) { force .nodes(graph.nodes) .links(graph.links) .start(); var link = svg.selectAll("line.link") .data(graph.links) .enter().append("line") .attr("class", "link") .style("stroke-width", function(d) { return Math.sqrt(d.value); }); var node = svg.selectAll("circle.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; }); node.append("text") .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; }); }); }); </script> </body> </html>