我在旧脚本中添加了一个新的javascript片段,我必须为强制网络布局添加高亮显示功能。我从rails应用程序中生成的json中获取图表信息。我一直使用的原始代码在这里:
var width = 960,
height = 960;
var color = d3.scale.category20();
var force = d3.layout.force()
.charge(-100)
.linkDistance(530)
.size([width, height]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var endpoint = window.location.href+".json"
d3.json(endpoint, function(graph) {
force
.nodes(graph.nodes)
.links(graph.links)
.start();
var link = svg.selectAll(".link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.style("marker-end", "url(#suit)");
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 10)
.style("fill", function(d) { return color(d.group); })
.call(force.drag)
.on('dblclick', connectedNodes);
node.append("title")
.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("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
});
svg.append("defs").selectAll("marker")
.data(["suit", "licensing", "resolved"])
.enter().append("marker")
.attr("id", function(d) { return d; })
.attr("viewBox", "0 -5 10 10")
.attr("refX", 25)
.attr("refY", 0)
.attr("markerWidth", 6)
.attr("markerHeight", 6)
.attr("orient", "auto")
.append("path")
.attr("d", "M0,-5L10,0L0,5 L10,0 L0, -5")
.style("stroke", "#4679BD")
.style("opacity", "0.6");
//APPENDED CODE ADDED HERE
//Toggle stores whether the highlighting is on
var toggle = 0;
//Create an array logging what is connected to what
var linkedByIndex = {};
for (i = 0; i < graph.nodes.length; i++) {
linkedByIndex[i + "," + i] = 1;
};
graph.links.forEach(function (d) {
linkedByIndex[d.source.index + "," + d.target.index] = 1;
});
//This function looks up whether a pair are neighbours
function neighboring(a, b) {
return linkedByIndex[a.index + "," + b.index];
}
function connectedNodes() {
if (toggle == 0) {
//Reduce the opacity of all but the neighbouring nodes
d = d3.select(this).node().__data__;
node.style("opacity", function (o) {
return neighboring(d, o) | neighboring(o, d) ? 1 : 0.1;
});
link.style("opacity", function (o) {
return d.index==o.source.index | d.index==o.target.index ? 1 : 0.1;
});
//Reduce the op
toggle = 1;
} else {
//Put them back to opacity=1
node.style("opacity", 1);
link.style("opacity", 1);
toggle = 0;
}
}
然后我尝试按照这里的建议追加更多的代码,并简单地将以下代码添加到上面脚本的底部,并以大写字母
标记可以这么简单....该脚本可以工作,但添加的功能(在节点之间添加高亮)却不能。错误信息显示:
Uncaught ReferenceError: graph is not defined
我怀疑它与
一行有关。 d3.json(endpoint, function(graph) {
和后续});是在错误的地方包含新的代码,但我玩过它,我不确定如何纠正它
<标题> 更新我解决了这个问题。问题很简单,我在函数中声明了graph,而其他函数无法访问它。解决方案是将其他函数放入声明它的函数中,这实际上意味着移动最后一个
});
从
行node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
});
到最后一行。
标题>答案现在在问题的UPDATE部分给出了