我正在尝试为力导向图添加一个阈值,其中我将仅包括高于我在地图中存储的某个阈值的顶点之间的边。我的滑块部分工作,边缘成功移除。
但是,在删除边缘后,图形会停止动画,并且在调用force.start()时控制台中会出错。我真的需要添加独特的ID吗?在我链接的JSFiddle中,他没有这样做,他的滑块没有问题。
谢谢! StackOverflow上有类似问题的答案有多个,我用它们来修复我明显的错误(例如d3.js: "Cannot read property 'weight' of undefined" when manually defining both nodes and links for force layout),但我还是这个。我正在使用此示例:来自此网站的http://jsfiddle.net/simonraper/TdHgx/?utm_source=website&utm_medium=embed&utm_campaign=TdHgx:http://www.coppelia.io/2014/07/an-a-to-z-of-extra-features-for-the-d3-force-layout/
我将发送相关的JS。
function draw(occurence) {
var ratio = window.devicePixelRatio || 1;
var width = Math.min(700,0.8*$(window).width()), height = 700;
var color = d3.scale.category20();
var svg = d3.select("#" + occurence).append("svg")
.attr("width", width)
.attr("height", height)
.attr("id", "#" + occurence + "svg");
d3.json(occurence + ".json", function(error, graph) {
if (error) throw error;
var force = d3.layout.force()
.charge(-120)
.linkDistance(50)
.size([width, height]);
force
.nodes(graph.nodes)
.links(graph.links)
.start();
if (occurence == "occurrences3") {
console.log(graph.nodes);
console.log(graph.links);
}
var graphRec=JSON.parse(JSON.stringify(graph)); //Add this line
var link = svg.selectAll(".link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value); });
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 5)
.style("fill", function(d) { return color(d.group); })
.call(force.drag);
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; });
});
node.on("dblclick", function(d) {
$("#uncuratedGraphsModal").modal();
var d = d3.select(this).node().__data__;
var name = d.name;
$("#uncuratedGraphsModalHeader").text("Node " + name);
$("#uncuratedGraphsModalBody").empty();
var edge_by_person = edge_by_person_per_threshold[occurence + "edge_by_person"];
var edges = edge_by_person[name];
edges.sort(function(a,b) {
return a.dest - b.dest;
});
$.each(edges, function(edge) {
var new_edge = $("<li>");
new_edge.text("Neighbor: " + edges[edge].dest + ", Token: " + edges[edge].token);
$("#uncuratedGraphsModalBody").append(new_edge);
});
});
$("#" + occurence + "thresholdSlider").on('input', function(thresh) {
threshold($("#" + occurence + "thresholdSlider").val());
});
//adjust threshold
function threshold(thresh) {
var edge_by_person = edge_by_person_per_threshold_unweighted[occurence + "edge_by_person_unweighted"];
graph.links.splice(0, graph.links.length);
for (var i = 0; i < graphRec.links.length; i++) {
var source = graphRec.links[i].source.name;
var dest = graphRec.links[i].target.name;
var value = -1;
var edges = edge_by_person[source];
var found = false;
for (var edge = 0; !found && edge < edges.length; edge++) {
if (dest == edges[edge].dest) {
value = edges[edge].token;
found = true;
}
}
if (value >= thresh) {
graph.links.push({
source: graphRec.links[i].source.name,
target: graphRec.links[i].target.name,
value: graphRec.links[i].value
});
}
}
restart();
}
//Restart the visualisation after any node and link changes
function restart() {
link = link.data(graph.links);
link.exit().remove();
link.enter().insert("line", ".node").attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value); });
node = node.data(graph.nodes);
node.enter().insert("circle", ".cursor").attr("class", "node")
.attr("r", 5)
.style("fill", function(d) { return color(d.group); })
.call(force.drag);
force
.nodes(node)
.links(link)
.start();
}
});
}
这是他从我链接的JsFiddle添加的JS:
这是我的理解:如果您有相同的节点,并且只是从graph.links中删除了一些边缘,那么您不能只执行force.start()吗?当我直接复制他的restart()函数时,所有链接都被破坏,并且没有重绘,即使执行console.log(graph.links)显示正确的重绘链接。
我认为此时它正在与错误的节点对话,可能是错误的SVG。我在同一页面上有多个SVG。