想知道您是否可以提供帮助。我尝试了不同的样式和不同的 d3js 示例，但它们都无法在节点上显示文本。有什么想法吗？
任务确实很简单。在节点顶部显示文本。我真的不知道为什么这不起作用，所以非常感谢您的帮助。
非常感谢您提前提供的帮助。
下面是代码，但为了方便起见，这里是 fiddle http://jsfiddle.net/rg5pmrz1/
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
<title>Force Layout Example 1</title>
<style>
.node {
fill: #ccc;
stroke: #fff;
stroke-width: 2px;
}
.link {
stroke: #777;
stroke-width: 2px;
}
.node text {
font: 10px sans-serif;
pointer-events: none;
}
text {
font: 10px sans-serif;
pointer-events: none;
}
</style>
</head>
<body>
<script src='http://d3js.org/d3.v3.min.js'></script>
<script>
// Define the dimensions of the visualization. We're using
// a size that's convenient for displaying the graphic on
// http://jsDataV.is
var width = window.innerWidth - 20,
height = innerHeight - 20;
var color = d3.scale.category10();
var force = d3.layout.force()
.charge(-300)
.linkDistance(function (l) { return l.value; })
.gravity(0.03)
.friction(0.9)
.size([width, height]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var graph = getData();
var nodeMap = {};
graph.nodes.forEach(function(d) {
nodeMap[d.name] = d;
//centering first element
if(d.main == true)
{
graph.nodes[0].x = width / 2;
graph.nodes[0].y = height / 2;
}
});
graph.links.forEach(function(l) {
l.source = nodeMap[l.source];
l.target = nodeMap[l.target];
l.distance = l.value;
l.size = l.value;
})
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 1 / (d.value / 1000);
});
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 30)
.style("fill", function(d) { return color(d.group); })
.on("mouseover", mouseover)
.on("mouseout", mouseout)
.call(force.drag);
node.append("title")
.attr("dy", ".35em")
.attr("text-anchor", "middle")
.text(function(d) { return d.name});
node.append("text")
.attr("x", 12)
.attr("dy", ".35em")
.text(function(d) { return d.name;console.log("name: " + 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; });
});
function mouseover() {
console.log("mouse over");
d3.select(this).transition()
.duration(250)
.attr("r", 60);
}
function mouseout() {
console.log("mouse out");
d3.select(this).transition()
.duration(250)
.attr("r", 30);
}
function click() {
console.log("clicky clicky");
d3.select(this).transition()
.duration(250)
.attr("r", 60);
}
function getData() {
return {
"nodes":[
{"name":"John","group":1, "value": 1, "main": true},
{"name":"Mike","group":2, "value": 2},
{"name":"Ian","group":1, "value": 3},
{"name":"James","group":2, "value": 4},
{"name":"Sarah","group":2,"value": 5}
],
"links":[
{"source":"John","target":"Mike","value":100},
{"source":"Ian","target":"John","value":200},
{"source":"John","target":"James","value":100},
{"source":"Sarah","target":"John","value":300},
] };
}
</script>
</body>
</html>
最佳答案
You can't add svg text to a svg circle. You should first create an svg g object (g stands for group) for each node, and than add a circle and a text for each g element, like in this code:
jsFiddle 。请注意勾选函数中的附加代码。
var width = window.innerWidth - 20,
height = innerHeight - 20;
var color = d3.scale.category10();
var force = d3.layout.force()
.charge(-300)
.linkDistance(function (l) { return l.value; })
.gravity(0.03)
.friction(0.9)
.size([width, height]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var graph = getData();
var nodeMap = {};
graph.nodes.forEach(function(d) {
nodeMap[d.name] = d;
//centering first element
if(d.main == true)
{
graph.nodes[0].x = width / 2;
graph.nodes[0].y = height / 2;
}
});
graph.links.forEach(function(l) {
l.source = nodeMap[l.source];
l.target = nodeMap[l.target];
l.distance = l.value;
l.size = l.value;
})
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 1 / (d.value / 1000);
});
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("g");
var circle = node.append("circle")
.attr("class", "node")
.attr("id", function (d) { return d.name; })
.attr("r", 30)
.style("fill", function (d) {
return color(d.group);
})
.on("mouseover", mouseover)
.on("mouseout", mouseout)
.call(force.drag);
var label = node.append("svg: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("transform", function(d) {
console.log(d);
return 'translate(' + [d.x, d.y] + ')';
});
});
function mouseover() {
console.log("mouse over");
d3.select(this).transition()
.duration(250)
.attr("r", 60);
}
function mouseout() {
console.log("mouse out");
d3.select(this).transition()
.duration(250)
.attr("r", 30);
}
function click() {
console.log("clicky clicky");
d3.select(this).transition()
.duration(250)
.attr("r", 60);
}
function getData() {
return {
"nodes":[
{"name":"John","group":1, "value": 1, "main": true},
{"name":"Mike","group":2, "value": 2},
{"name":"Ian","group":1, "value": 3},
{"name":"James","group":2, "value": 4},
{"name":"Sarah","group":2,"value": 5}
],
"links":[
{"source":"John","target":"Mike","value":100},
{"source":"Ian","target":"John","value":200},
{"source":"John","target":"James","value":100},
{"source":"Sarah","target":"John","value":300},
] };
}
关于javascript - d3js 文本未显示在节点图上，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29112197/