D3节点文本显示在工具提示中

Question

我正在关注代码this location：

我的json文件看起来像这样

[
{"name":"flare.analytics.A","size":3938,"imports":["flare.analytics.B,flare.analytics.C"]},
{"name":"flare.analytics.B","size":3812,"imports":["flare.analytics.C,flare.analytics.D"]},
{"name":"flare.analytics.C","size":3812,"imports":["flare.analytics.D,flare.analytics.E"]},
{"name":"flare.analytics.D","size":743, "imports":["flare.analytics.E,flare.analytics.F"]},
{"name":"flare.analytics.E","size":3534,"imports":["flare.analytics.F,flare.analytics.G"]},
{"name":"flare.analytics.F","size":5731,"imports":["flare.analytics.G,flare.analytics.H"]},
{"name":"flare.analytics.G","size":7840,"imports":["flare.analytics.H,flare.analytics.I"]},
{"name":"flare.analytics.H","size":5914,"imports":["flare.analytics.I,flare.analytics.A"]},
{"name":"flare.analytics.I","size":3416,"imports":["flare.analytics.B,flare.analytics.A"]}
]

我在本教程后面的代码中添加了一个工具提示 http://bl.ocks.org/Caged/6476579

我添加了

.d3-tip in Style section

然后我添加了功能

var tip = d3.tip()
  .attr('class', 'd3-tip')
  .offset([-10, 0])
  .html(function(d) {
    return "<strong>Frequency:</strong> <span style='color:red'>" + d.frequency +     "</span>";
  })

svg.call(tip);

现在在上面的html函数而不是d.frequency中我添加了 d3.select（＆＃34; text＆＃34;）。text（）所以它变成了

return "<strong>Frequency:</strong> <span style='color:red'>" + d3.select("text").text() +     "</span>";

在我的鼠标功能中，我添加了

node
.classed("mouseover", tip.show);

在mouseouted我添加了

node
.classed("mouseover", tip.hide);

问题是，它始终从我的树中选择第一个元素并显示为工具提示

我在Show d3 node text only on hover找到了答案。

但我不确定如何将其整合到我的代码中

更新

node = node
  .data(nodes.filter(function(n) { return !n.children; }))
.enter().append("text")
  .attr("class", "node")
  .attr("dx", function(d) { return d.x < 180 ? 8 : -8; })
  .attr("dy", ".31em")
  .attr("transform", function(d) { return "rotate(" + (d.x - 90) + ")translate(" + d.y + ")" + (d.x < 180 ? "" : "rotate(180)"); })
  .style("text-anchor", function(d) { return d.x < 180 ? "start" : "end"; })
  .text(function(d) { return d.key; })
  .on("mouseover", mouseovered)
  .on("mouseout", mouseouted);
});

var tip = d3.tip()
  .attr('class', 'd3-tip')
  .offset([-10, 0])
  .html(function(d) {
    return "<span style='color:red'>" + d3.select("text").text()+ "</span>";
  })

Answer 1

您可以在鼠标悬停功能中设置提示的html属性（而不是您定义＆＃39;提示＆＃39;）：

function mouseovered(d) {
   tip.html("<strong>Frequency:</strong> <span style='color:red'>" + d.key + "</span>"
);

看到这个小提琴：http://jsfiddle.net/henbox/XqEMf/3/

否则，在进行鼠标悬停之前，您需要定义工具提示的值

请注意，您还希望将提示定义更改为：

var tip = d3.tip()
  .attr('class', 'd3-tip')
  .offset([-10, 0]);