如何在D3中获取控制台中所选节点的值

时间:2013-11-28 07:15:45

标签: javascript json d3.js

我有一个应用程序,我需要使用D3制作网格。我还需要获取它们的值。因此我的应用程序具有使用鼠标拖动选择的能力,现在我需要在控制台中的值。这是......

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.node {
stroke: #fff;
stroke-width: 1.5px;
}

.node .selected {
stroke: red;
 }

  .link {
  stroke: #999;
}

.brush .extent {
fill-opacity: .1;
stroke: #fff;
shape-rendering: crispEdges;
}

</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>

var width = 960,
height = 500,
shiftKey;

var svg = d3.select("body")
.attr("tabindex", 1)
.on("keydown.brush", keyflip)
.on("keyup.brush", keyflip)
.each(function() { this.focus(); })
.append("svg")
.attr("width", width)
.attr("height", height);

d3.json("graph.json", function(error, graph) {

graph.links.forEach(function(d) {
d.source = graph.nodes[d.source];
d.target = graph.nodes[d.target];
});

  var link = svg.append("g")
  .attr("class", "link")
.selectAll("line")
  .data(graph.links)
.enter().append("line")
  .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; });

 var brush = svg.append("g")
  .datum(function() { return {selected: false, previouslySelected: false}; })
  .attr("class", "brush")
  .call(d3.svg.brush()
    .x(d3.scale.identity().domain([0, width]))
    .y(d3.scale.identity().domain([0, height]))
    .on("brushstart", function(d) {
      node.each(function(d) { d.previouslySelected = shiftKey && d.selected; });
    })
    .on("brush", function() {
      var extent = d3.event.target.extent();
      node.classed("selected", function(d) {
        return d.selected = d.previouslySelected ^
            (extent[0][0] <= d.x && d.x < extent[1][0]
            && extent[0][1] <= d.y && d.y < extent[1][1]);
      });
    })
    .on("brushend", function() {
      d3.event.target.clear();
      d3.select(this).call(d3.event.target);
    }));

  var node = svg.append("g")
  .attr("class", "node")
.selectAll("circle")
  .data(graph.nodes)
.enter().append("circle")
  .attr("r", 4)
  .attr("cx", function(d) { return d.x; })
  .attr("cy", function(d) { return d.y; })
  .on("mousedown", function(d) {
    if (shiftKey) d3.select(this).classed("selected", d.selected = !d.selected);
    else node.classed("selected", function(p) { return p.selected = d === p; });
    });
   });

   function keyflip() {
 shiftKey = d3.event.shiftKey || d3.event.metaKey;
}

</script>

这是json

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我需要在应用程序运行时使用鼠标拖动选择节点,值将进入控制台

0 个答案:

没有答案