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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<style>
.node {
stroke: #fff;
stroke-width: 1.5px;
}
.link {
stroke: #999;
stroke-opacity: .6;
}
</style>
<body>
</body>
<script src="d3.v3.min.js"></script>
<script>
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("data.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", function(d) {return d.r;})
.style("fill", function(d) { return color(d.group); })
node.append("title")
.text(function(d) { return d.name; });
node.append("text")
.text("A");
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>
</html>
The code above is using D3js to draw a Force-directed graph drawing from some data, and I just want to place some text on the circle so I use node.append("text") you can see it above.
But however when add it it does not work, there is still not text on the circle so I wonder how could it be????
441
SVG does not allow a text element inside an circle element. You should put the circle and the text element inside a common g. Try something like this (not tested):
var node = svg.selectAll(".node")
.data(graph.nodes).enter().append('g').classed('node', true);
node.append("circle")
.attr("r", function(d) {return d.r;})
.style("fill", function(d) { return color(d.group); })
.append("title")
.text(function(d) { return d.name; });
node.append("text")
.text("A");
And then instead of setting cx and cy on nodes, set the transform property on the g.node:
force.on("tick", function() {
// ...
node.attr("transform", function(d) { return 'translate(' + [d.x, d.y] + ')'; })
});
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