[英]Labeling network nodes in D3
I need to draw labels (names) besides nodes with D3. 除了带有D3的节点外,我还需要绘制标签(名称)。 Here's my code:
这是我的代码:
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
var width = window.innerWidth,
height = 400;
var color = d3.scale.category20();
var force = d3.layout.force()
.charge(-120)
.linkDistance(40)
.size([width, height]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.call(d3.behavior.zoom().on("zoom", redraw))
.append('g');
function redraw() {
svg.attr("transform",
"translate(" + d3.event.translate + ")"
+ " scale(" + d3.event.scale + ")");}
var drag = force.stop().drag()
.on("dragstart", function(d) {
d3.event.sourceEvent.stopPropagation();
});
d3.json("/static/net.json", function(error, graph) {
if (error) throw error;
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.degree; })
.style("fill", function(d) { return color(d.group); })
.call(force.drag);
node.append("title")
.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>
For some reason, labels only appear if I hover over nodes with the mouse, instead of always being drawn. 由于某些原因,仅当我将鼠标悬停在节点上时才会显示标签,而不是始终绘制标签。
When I replace: 当我更换时:
node.append("title")
.text(function(d) { return d.name; })
with: 与:
node.append("text")
.attr("dx", 12)
.attr("dy", ".35em")
.text(function(d) { return d.name });
No label appear at all, even when hovering. 即使悬停也不显示任何标签。
Is there something obvious I am missing in this code? 这段代码中我明显缺少什么吗?
The issue is that you're trying to append a text element to a circle. 问题是您正在尝试将文本元素附加到圆上。
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", function(d) { return d.degree; })
.style("fill", function(d) { return color(d.group); })
.call(force.drag);
// node here consists of svg circles.
node.append("text")
.text(function(d) { return d.name; })
Try this instead 试试这个
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("g")
.attr("class", "node")
.call(force.drag); // moved this here
node.append("circle")
.attr("r", function(d) { return d.degree; })
.style("fill", function(d) { return color(d.group); })
// .call(force.drag);
// node here is a `g` element so we can append text elements to it.
node.append("text")
.text(function(d) { return d.name; })
I also moved the call(force.drag)
up to after the .attr("class", "node")
line in order to have it apply to all children of a given node
element. 我还将
call(force.drag)
移到.attr("class", "node")
行之后,以便将其应用于给定node
元素的所有子级。
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