可以't识别或风格化d3中的拉丝(即选定的）元素

Can't identify or stylize brushed (i.e. selected) elements in d3

本文关键字：元素 识别 d3 风格化 可以      更新时间：2023-09-26

我正在学习两个教程：

  1. http://bl.ocks.org/mbostock/4062045
  2. http://bl.ocks.org/mbostock/4560481

但我似乎无法识别或风格化所选（即刷）的元素。我怀疑是某种范围问题。

这是我的代码：

<!DOCTYPE html>
<head>
<meta charset="utf-8">
<style>
.node {
  stroke: #fff;
  stroke-width: 1.5px;
}
.node .selected {
  stroke: #ff0;
}
.link {
  stroke: #999;
  stroke-opacity: .6;
}
.brush .extent {
  stroke: #fff;
  fill-opacity: 0.2;
  shape-rendering: crispEdges;
}
</style>
</head>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var force = d3.layout.force()
    .gravity(0.1)
    .linkStrength(0.1)
    .charge(-50)
    .linkDistance(25)
    .size([window.innerWidth, window.innerHeight]);
var svg = d3.select("body").append("svg")
    .attr("width", window.innerWidth)
    .attr("height", window.innerHeight);
d3.json("graph.json", function(error, graph) {
  force
      .nodes(graph.nodes)
      .links(graph.links)
      .start();
  var link = svg.append("g").attr("class", "link")
    .selectAll("line")
      .data(graph.links)
    .enter().append("line")
      .style("stroke-width", 1);
  var node = svg.append("g").attr("class", "node")
    .selectAll("circle")
      .data(graph.nodes)
    .enter().append("circle")
      .attr("r", 5);
  var brush = svg.append("g").attr("class", "brush")
    .call(d3.svg.brush()
      .x(d3.scale.identity().domain([0, window.innerWidth]))
      .y(d3.scale.identity().domain([0, window.innerHeight]))
      .on("brush", function () {    // Here be dragons
        var extent = d3.event.target.extent();
        node.classed("selected", function (d) {
          return extent[0][0] <= d.x && d.x < extent[1][0]
                 && extent[0][1] <= d.y && d.y < extent[1][1];
        });
  }));
  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>
</body>
</html>

这是图.json:

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在高亮显示区域的控制台中运行$('.selected')只会产生1个选定的元素，尽管笔刷区域有多大。任何帮助都是非常受欢迎的！

我看到页面中没有包含jQuery，所以$实际上不是jQuery别名，但我相信它是一些控制台快捷方式，只返回一个元素。

我还没有机会在jsFiddle中测试您的示例，但我测试了您提供的第二个链接（该链接也没有包含jQuery），实际上$返回了一个元素，但d3.selectAll（'.selected'）和document.querySelectorAll（'.select'）返回了正确数量的元素。尝试使用这些，看看问题是否仍然存在。

selected类所做的唯一一件事就是为所选元素添加一个stroke:red规则，所以选择这些元素不应该是非常壮观的事情。

编辑：$（）方法（如果您使用chrome）如下所述：https://developer.chrome.com/devtools/docs/commandline-api#selector。它只返回与您的选择匹配的第一个DOM元素。如果需要所有元素，请使用$$（相当于document.querySelectorAll）

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