我試圖通過Web套接字使用D3.js將圖形可視化。我試圖顯示節點標籤(可以在下面的代碼中看到),但它似乎並沒有出現。請參閱函數start()。這裏有什麼問題?在D3.js的動態強制佈局圖中顯示節點標籤
<script>
var width = 1900,
height = 1080;
var color = d3.scale.category10();
var nodes = [],
links = [];
var force = d3.layout.force()
.nodes(nodes)
.links(links)
.charge(-100)
.gravity(0.1)
.linkDistance(100)
.size([width, height])
.on("tick", tick);
var svg = d3.select("body").append("svg").attr("width",width).attr("height", height);
var node = svg.selectAll(".node"),
link = svg.selectAll(".link");
function tick() {
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
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; });
}
// Add and remove elements on the graph object
function addNode(id) {
nodes.push({"name":id, "id":id});
start();
}
function addEdge(edgeId,sourceId,targetId) {
var sourceNode = findNode(sourceId);
var targetNode = findNode(targetId);
if((sourceNode !== undefined) && (targetNode !== undefined)) {
links.push({"edgeId":edgeId, "source": sourceNode, "target": targetNode});
start();
}
}
function removeEdge(edgeId) {
for (var i = 0; i < links.length; i++) {
if (links[i].edgeId == edgeId) {
links.splice(i, 1);
break;
}
}
start();
}
var findNode = function (id) {
for (var i=0; i < nodes.length; i++) {
if (nodes[i].id === id)
return nodes[i]
};
}
function start() {
var drag = force.drag().origin(function(d) { return d; }).on("dragstart", dragstarted).on("drag", dragged).on("dragend", dragended);
link = link.data(force.links(), function(d) { return d.source.id + "-" + d.target.id; });
link.enter().insert("line", ".node").attr("class", "link");
link.exit().remove();
node = node.data(force.nodes(), function(d) { return d.id;});
node.enter().append("circle").attr("class", "node")
.attr("r", 5)
.style("fill", function(d) { return color(d.group); })
.call(drag);
node.append("text")
.attr("dx", 12)
.attr("dy", ".35em")
.text(function(d) { return d.name });
node.exit().remove();
force.start();
}
function dragstarted(d) {
d3.event.sourceEvent.stopPropagation();
d3.select(this).classed("dragging", true);
}
function dragged(d) {
d3.select(this).attr("cx", d.x = d3.event.x).attr("cy", d.y = d3.event.y);
}
function dragended(d) {
d3.select(this).classed("dragging", false);
}
var socket = new WebSocket('ws://localhost:8887');
socket.onopen = function(){
console.log("Connection established, handle with function");
};
socket.onmessage = function(evt){
var obj = JSON.parse(evt.data);
if(obj.operation == "nodeAdded")
{
addNode(obj.nodeId);
}
if(obj.operation == "edgeAdded")
{
addEdge(obj.edgeId,obj.fromNodeId,obj.toNodeId);
}
if(obj.operation == "edgeRemoved")
{
removeEdge(obj.edgeId);
}
}
</script>
感謝您的建議。我試過了,但我仍然沒有看到節點標籤。 – adsun
剛剛更新了我的答案。 – sergeyz