Question

想知道你是否可以提供帮助。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。这会有什么想法吗？

这项任务非常简单。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你的帮助。

非常感谢您的帮助。

下面是代码，但为了方便，这里是小提琴 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>

Answer 1

从重复问题here和here的答案中，原因是：

您无法将svg文本添加到svg圈子中。您应首先为每个节点创建一个svg g对象（g代表组），然后为每个g元素添加一个圆和一个文本，如下面的代码所示：

jsFiddle。请注意tick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},
  ] };    

}

Answer 2

这似乎减少了闪烁。用以下内容替换var node = etc.：

var node = svg.selectAll(".node")
.data(graph.connections)
.enter().append("g") //this appends the G to enable the text
.attr("class", "node")
.call(force.drag);


node.append("circle") //then we add the circle
.attr("class", "node")
.attr("r", function (d) {
    if (d.main == true)
    {
        return 45;
    }
    else
    {
        return 30;
    }
})

.style("fill", function(d) { return color(d.group); })
.on("mouseover", mouseover)
.on("mouseout", mouseout)
.call(force.drag);

d3js文本未显示在节点图上

2 个答案: