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我想在單擊節點時突出顯示父鏈接。父鏈接意味着被點擊的節點和根之間的所有鏈接。D3樹佈局：如何突出顯示整個路徑
我堅持在點擊節點時選擇鏈接的過程。如何實現這一目標？
的HTML文件：
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.node circle {
fill: #fff;
stroke: steelblue;
stroke-width: 3px;
}
.node text {
font: 30px sans-serif;
}
.link {
fill: none;
stroke: #ccc;
stroke-width: 7px;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var margin = {top: 20, right: 20, bottom: 20, left: 20},
width = 1200 - margin.right - margin.left,
height = 800 - margin.top - margin.bottom;
var i = 0,
duration = 750,
root;
var tree = d3.layout.tree();
var diagonal = d3.svg.diagonal()
.projection(function(d) { return [d.x, d.y]; });
var svg = d3.select("body").append("svg")
.attr("width", width + margin.right + margin.left)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
d3.json("parse_tree.json", function(error, parse_tree) {
if (error) throw error;
root = parse_tree;
root.x0 = height/2;
root.y0 = 0;
tree.size([width, height]);
update(root);
});
function update(source1) {
var originalConsole = console;
var nodes = tree.nodes(root);
var links = tree.links(nodes);
nodes.forEach(function(d) { d.y = d.depth * 100; });
// Update the nodes…
var node = svg.selectAll("g.node")
.data(nodes, function(d) { return d.id || (d.id = ++i); });
// Enter any new nodes at the parent's previous position.
var nodeEnter = node.enter().append("g")
.attr("class", "node")
.attr("transform", function(d) { return "translate(" + source1.y0 + "," + source1.x0 + ")"; })
.on("click", click);
nodeEnter.append("circle")
.attr("r", 1e-6)
.style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });
nodeEnter.append("text")
.attr("x", function(d) { return d.children || d._children ? -20 : 20; })
.attr("dy", ".35em")
.attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; })
.text(function(d) { return d.name; })
.style("fill-opacity", 1e-6);
// Transition nodes to their new position.
var nodeUpdate = node.transition()
.duration(duration)
.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
nodeUpdate.select("circle")
.attr("r", 10)
.style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });
nodeUpdate.select("text")
.style("fill-opacity", 1);
// Transition exiting nodes to the parent's new position.
var nodeExit = node.exit().transition()
.duration(duration)
.attr("transform", function(d) { return "translate(" + source1.y + "," + source1.x + ")"; })
.remove();
nodeExit.select("circle")
.attr("r", 1e-6);
nodeExit.select("text")
.style("fill-opacity", 1e-6);
// Update the links…
var link = svg.selectAll("path.link")
.data(links, function(d) {
return d.target.id; }
);
// Enter any new links at the parent's previous position.
link.enter().insert("path", "g")
.attr("class", "link")
.attr("d", function(d) {
var o = {x: source1.x0, y: source1.y0};
return diagonal({source: o, target: o});
})
.style("stroke-width", "3px")
.style("stroke", "green");
// Transition links to their new position.
link.transition()
.duration(duration)
.attr("d", diagonal);
// Transition exiting nodes to the parent's new position.
link.exit().transition()
.duration(duration)
.attr("d", function(d) {
var o = {x: source1.x, y: source1.y};
return diagonal({source: o, target: o});
})
.remove();
// Stash the old positions for transition.
nodes.forEach(function(d) {
d.x0 = d.x;
d.y0 = d.y;
});
for(var k = 0; k < 1000; k++)
flag = 0;
}
// Toggle children on click.
function click(d) {
if (d.children) {
d._children = d.children;
d.children = null;
} else {
d.children = d._children;
d._children = null;
}
update(d);
}
</script>
JSON文件：
{"name":"VP",
"size":"89",
"children": [
{"name":"VBP",
"size":"15",
"children":[{"name":"are", "size":"38"}]
},
{"name":"NP",
"size":"83",
"children": [
{"name":"DT",
"size":"29",
"children":[{"name":"a", "size":"53"}]
},
{"name":"NN",
"size":"50",
"children":[{"name":"boy", "size":"99"}]
}
]
}
]
}