D3 V4 Draggable network with Force Directed Layout - javascript

What am trying to do is
Have user select a bunch of nodes
Let the user drag those nodes
Use forcesimulation to manage the layout.
Something similar to http://jsfiddle.net/pkerpedjiev/29majy5c/2/
But I need this in V4.
var graph = {"nodes":[{"x":444,"y":275},{"x":378,"y":324},{"x":478,"y":278},{"x":471,"y":256},{"x":382,"y":269},{"x":371,"y":247},{"x":359,"y":276},{"x":364,"y":302},{"x":400,"y":330},{"x":388,"y":298},{"x":524,"y":296},{"x":570,"y":243},{"x":552,"y":159},{"x":502,"y":287},{"x":511,"y":313},{"x":513,"y":265},{"x":602,"y":132},{"x":610,"y":90},{"x":592,"y":91},{"x":575,"y":89},{"x":607,"y":73},{"x":591,"y":68},{"x":574,"y":73},{"x":589,"y":149},{"x":620,"y":205},{"x":621,"y":230},{"x":589,"y":234},{"x":602,"y":223},{"x":548,"y":188},{"x":532,"y":196},{"x":548,"y":114},{"x":575,"y":174},{"x":497,"y":250},{"x":576,"y":196},{"x":504,"y":201},{"x":494,"y":186},{"x":482,"y":199},{"x":505,"y":219},{"x":486,"y":216},{"x":590,"y":306},{"x":677,"y":169},{"x":657,"y":258},{"x":667,"y":205},{"x":552,"y":227},{"x":518,"y":173},{"x":473,"y":125},{"x":796,"y":260},{"x":731,"y":272},{"x":642,"y":288},{"x":576,"y":269},{"x":605,"y":187},{"x":559,"y":289},{"x":544,"y":356},{"x":505,"y":365},{"x":579,"y":289},{"x":619,"y":282},{"x":574,"y":329},{"x":664,"y":306},{"x":627,"y":304},{"x":643,"y":327},{"x":664,"y":348},{"x":665,"y":327},{"x":653,"y":317},{"x":650,"y":338},{"x":622,"y":321},{"x":633,"y":338},{"x":647,"y":357},{"x":718,"y":362},{"x":636,"y":240},{"x":640,"y":227},{"x":617,"y":249},{"x":631,"y":254},{"x":566,"y":213},{"x":713,"y":322},{"x":716,"y":298},{"x":666,"y":241},{"x":627,"y":355}],"links":[{"source":1,"target":0},{"source":2,"target":0},{"source":3,"target":0},{"source":3,"target":2},{"source":4,"target":0},{"source":5,"target":0},{"source":6,"target":0},{"source":7,"target":0},{"source":8,"target":0},{"source":9,"target":0},{"source":11,"target":10},{"source":11,"target":3},{"source":11,"target":2},{"source":11,"target":0},{"source":12,"target":11},{"source":13,"target":11},{"source":14,"target":11},{"source":15,"target":11},{"source":17,"target":16},{"source":18,"target":16},{"source":18,"target":17},{"source":19,"target":16},{"source":19,"target":17},{"source":19,"target":18},{"source":20,"target":16},{"source":20,"target":17},{"source":20,"target":18},{"source":20,"target":19},{"source":21,"target":16},{"source":21,"target":17},{"source":21,"target":18},{"source":21,"target":19},{"source":21,"target":20},{"source":22,"target":16},{"source":22,"target":17},{"source":22,"target":18},{"source":22,"target":19},{"source":22,"target":20},{"source":22,"target":21},{"source":23,"target":16},{"source":23,"target":17},{"source":23,"target":18},{"source":23,"target":19},{"source":23,"target":20},{"source":23,"target":21},{"source":23,"target":22},{"source":23,"target":12},{"source":23,"target":11},{"source":24,"target":23},{"source":24,"target":11},{"source":25,"target":24},{"source":25,"target":23},{"source":25,"target":11},{"source":26,"target":24},{"source":26,"target":11},{"source":26,"target":16},{"source":26,"target":25},{"source":27,"target":11},{"source":27,"target":23},{"source":27,"target":25},{"source":27,"target":24},{"source":27,"target":26},{"source":28,"target":11},{"source":28,"target":27},{"source":29,"target":23},{"source":29,"target":27},{"source":29,"target":11},{"source":30,"target":23},{"source":31,"target":30},{"source":31,"target":11},{"source":31,"target":23},{"source":31,"target":27},{"source":32,"target":11},{"source":33,"target":11},{"source":33,"target":27},{"source":34,"target":11},{"source":34,"target":29},{"source":35,"target":11},{"source":35,"target":34},{"source":35,"target":29},{"source":36,"target":34},{"source":36,"target":35},{"source":36,"target":11},{"source":36,"target":29},{"source":37,"target":34},{"source":37,"target":35},{"source":37,"target":36},{"source":37,"target":11},{"source":37,"target":29},{"source":38,"target":34},{"source":38,"target":35},{"source":38,"target":36},{"source":38,"target":37},{"source":38,"target":11},{"source":38,"target":29},{"source":39,"target":25},{"source":40,"target":25},{"source":41,"target":24},{"source":41,"target":25},{"source":42,"target":41},{"source":42,"target":25},{"source":42,"target":24},{"source":43,"target":11},{"source":43,"target":26},{"source":43,"target":27},{"source":44,"target":28},{"source":44,"target":11},{"source":45,"target":28},{"source":47,"target":46},{"source":48,"target":47},{"source":48,"target":25},{"source":48,"target":27},{"source":48,"target":11},{"source":49,"target":26},{"source":49,"target":11},{"source":50,"target":49},{"source":50,"target":24},{"source":51,"target":49},{"source":51,"target":26},{"source":51,"target":11},{"source":52,"target":51},{"source":52,"target":39},{"source":53,"target":51},{"source":54,"target":51},{"source":54,"target":49},{"source":54,"target":26},{"source":55,"target":51},{"source":55,"target":49},{"source":55,"target":39},{"source":55,"target":54},{"source":55,"target":26},{"source":55,"target":11},{"source":55,"target":16},{"source":55,"target":25},{"source":55,"target":41},{"source":55,"target":48},{"source":56,"target":49},{"source":56,"target":55},{"source":57,"target":55},{"source":57,"target":41},{"source":57,"target":48},{"source":58,"target":55},{"source":58,"target":48},{"source":58,"target":27},{"source":58,"target":57},{"source":58,"target":11},{"source":59,"target":58},{"source":59,"target":55},{"source":59,"target":48},{"source":59,"target":57},{"source":60,"target":48},{"source":60,"target":58},{"source":60,"target":59},{"source":61,"target":48},{"source":61,"target":58},{"source":61,"target":60},{"source":61,"target":59},{"source":61,"target":57},{"source":61,"target":55},{"source":62,"target":55},{"source":62,"target":58},{"source":62,"target":59},{"source":62,"target":48},{"source":62,"target":57},{"source":62,"target":41},{"source":62,"target":61},{"source":62,"target":60},{"source":63,"target":59},{"source":63,"target":48},{"source":63,"target":62},{"source":63,"target":57},{"source":63,"target":58},{"source":63,"target":61},{"source":63,"target":60},{"source":63,"target":55},{"source":64,"target":55},{"source":64,"target":62},{"source":64,"target":48},{"source":64,"target":63},{"source":64,"target":58},{"source":64,"target":61},{"source":64,"target":60},{"source":64,"target":59},{"source":64,"target":57},{"source":64,"target":11},{"source":65,"target":63},{"source":65,"target":64},{"source":65,"target":48},{"source":65,"target":62},{"source":65,"target":58},{"source":65,"target":61},{"source":65,"target":60},{"source":65,"target":59},{"source":65,"target":57},{"source":65,"target":55},{"source":66,"target":64},{"source":66,"target":58},{"source":66,"target":59},{"source":66,"target":62},{"source":66,"target":65},{"source":66,"target":48},{"source":66,"target":63},{"source":66,"target":61},{"source":66,"target":60},{"source":67,"target":57},{"source":68,"target":25},{"source":68,"target":11},{"source":68,"target":24},{"source":68,"target":27},{"source":68,"target":48},{"source":68,"target":41},{"source":69,"target":25},{"source":69,"target":68},{"source":69,"target":11},{"source":69,"target":24},{"source":69,"target":27},{"source":69,"target":48},{"source":69,"target":41},{"source":70,"target":25},{"source":70,"target":69},{"source":70,"target":68},{"source":70,"target":11},{"source":70,"target":24},{"source":70,"target":27},{"source":70,"target":41},{"source":70,"target":58},{"source":71,"target":27},{"source":71,"target":69},{"source":71,"target":68},{"source":71,"target":70},{"source":71,"target":11},{"source":71,"target":48},{"source":71,"target":41},{"source":71,"target":25},{"source":72,"target":26},{"source":72,"target":27},{"source":72,"target":11},{"source":73,"target":48},{"source":74,"target":48},{"source":74,"target":73},{"source":75,"target":69},{"source":75,"target":68},{"source":75,"target":25},{"source":75,"target":48},{"source":75,"target":41},{"source":75,"target":70},{"source":75,"target":71},{"source":76,"target":64},{"source":76,"target":65},{"source":76,"target":66},{"source":76,"target":63},{"source":76,"target":62},{"source":76,"target":48},{"source":76,"target":58}]}
var width = 400,
height = 500,
shiftKey;
var svg = d3.select("body")
.attr("tabindex", 1)
.on("keydown.brush", keydown)
.on("keyup.brush", keyup)
.each(function() { this.focus(); })
.append("svg")
.attr("width", width)
.attr("height", height);
var link = svg.append("g")
.attr("class", "link")
.selectAll("line");
var brush = svg.append("g")
.datum(function() { return {selected: false, previouslySelected: false}; })
.attr("class", "brush");
var node = svg.append("g")
.attr("class", "node")
.selectAll("circle");
graph.links.forEach(function(d) {
d.source = graph.nodes[d.source];
d.target = graph.nodes[d.target];
});
link = link.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; });
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 force = d3.layout.force()
.charge(-120)
.linkDistance(30)
.nodes(graph.nodes)
.links(graph.links)
.size([width, height])
.start();
node = node.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 (!d.selected) { // Don't deselect on shift-drag.
if (!shiftKey) node.classed("selected", function(p) { return p.selected = d === p; });
else d3.select(this).classed("selected", d.selected = true);
}
})
.on("mouseup", function(d) {
if (d.selected && shiftKey) d3.select(this).classed("selected", d.selected = false);
})
.call(d3.behavior.drag()
.on("dragstart", function(d1) {
node.filter(function(d) { return d.selected; })
.each(function(d) { d.fixed |= 2; })
})
.on("drag", function(d1) {
node.filter(function(d) { return d.selected; })
.each(function(d) {
d.x += d3.event.dx;
d.y += d3.event.dy;
d.px += d3.event.dx;
d.py += d3.event.dy;
})
force.resume();
})
.on("dragend", function(d) {
node.filter(function(d) { return d.selected; })
.each(function(d) { d.fixed &= ~6; })
}));
function tick() {
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; });
};
force.on("tick", tick);
function keydown() {
shiftKey = d3.event.shiftKey || d3.event.metaKey;
}
function keyup() {
shiftKey = d3.event.shiftKey || d3.event.metaKey;
}
.node {
stroke: #fff;
stroke-width: 1.5px;
}
.node .selected {
stroke: red;
}
.link {
stroke: #999;
}
.brush .extent {
fill-opacity: .1;
stroke: #fff;
shape-rendering: crispEdges;
}
<!DOCTYPE html>
<style>
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
</script>


This D3 block contains a v4 selectable Force-Layout Graph. It is based on the example you gave but using the syntax introduced in v4.
Hope it helps.

Related

d3 Node Labels and collapsing

I currently have a D3 that displays a force directed network and will collapse its children on click. I would like to to also display the names of the nodes on hover. Something like this: https://bl.ocks.org/mbostock/1212215
Below is my code so far.
.node {
cursor: pointer;
stroke: #3182bd;
stroke-width: 1.5px;
}
.link {
fill: none;
stroke: #9ecae1;
stroke-width: 1.5px;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var width = 960,
height = 500,
root;
var force = d3.layout.force()
.size([width, height])
.on("tick", tick);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
//Added markers to indicate that this is a directed graph
svg.append("defs").selectAll("marker")
.data(["arrow"])
.enter().append("marker")
.attr("id", function(d) { return d; })
.attr("viewBox", "0 -5 10 10")
.attr("refX", 15)
.attr("refY", -1.5)
.attr("markerWidth", 4)
.attr("markerHeight", 4)
.attr("orient", "auto")
.append("path")
.attr("d", "M0,-5L10,0L0,5");
var link = svg.selectAll(".link"),
node = svg.selectAll(".node");
d3.json("test.json", function(json) {
root = json;
//Give nodes ids and initialize variables
for(var i=0; i<root.nodes.length; i++) {
var node = root.nodes[i];
node.id = i;
node.collapsing = 0;
node.collapsed = false;
}
//Give links ids and initialize variables
for(var i=0; i<root.links.length; i++) {
var link = root.links[i];
link.source = root.nodes[link.source];
link.target = root.nodes[link.target];
link.id = i;
}
// for (var i=0; i<root.nodes.length; i++){
// var node = root.nodes[i];
// }
update();
});
function update() {
//Keep only the visible nodes
var nodes = root.nodes.filter(function(d) {
return d.collapsing == 0;
});
var links = root.links;
//Keep only the visible links
links = root.links.filter(function(d) {
return d.source.collapsing == 0 && d.target.collapsing == 0;
});
force
.nodes(nodes)
.links(links)
.start();
// Update the links…
link = link.data(links, function(d) { return d.id; });
// Exit any old links.
link.exit().remove();
// Enter any new links.
link.enter().insert("line", ".node")
.attr("class", "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; })
// Update the nodes…
node = node.data(nodes, function(d){ return d.id; }).style("fill", color);
// Exit any old nodes.
node.exit().remove();
// Enter any new nodes.
node.enter().append("circle")
.attr("class", "node")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", function(d) { return Math.sqrt(d.size) / 10 || 4.5; })
.style("fill", color)
.on("click", click)
.call(force.drag);
}
function tick() {
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; });
}
// Color leaf nodes orange, and packages white or blue.
function color(d) {
return d.collapsed ? "#3182bd" : d.children ? "#c6dbef" : "#fd8d3c";
}
// Toggle children on click.
function click(d) {
if (!d3.event.defaultPrevented) {
//check if link is from this node, and if so, collapse
root.links.forEach(function(l) {
if(l.source.id == d.id) {
if(d.collapsed){
l.target.collapsing--;
} else {
l.target.collapsing++;
}
}
});
d.collapsed = !d.collapsed;
}
update();
}
</script>
My issue is with the update function. I was able to get it to display, but when I clicked to collapse, it wouldn't show the labels after. Im not sure if I should be tweeting the tick or what.
thanks!

Group the circle and text labels using SVG group element as shown below.
var groupNodes = node.enter().append("g")
.attr("class", "node")
.attr("transform", function(d) { return "translate("+d.x+","+d.y+")"; });
.on("click", click)
.on("mouseover", function(){
d3.select(this).select("text").style("display","block");
})
.on("mouseout", function(){
d3.select(this).select("text").style("display","none");
})
.call(force.drag);
groupNodes.append("circle")
.attr("r", function(d) { return Math.sqrt(d.size) / 10 || 4.5; })
.style("fill", color);
var label = groupNodes.append("text")
.attr("dy", ".35em")
.style("display", "none)
.text(function(d) { return d.name; //Use the key which holds the name value });
The above code replaces following part of the code in the update function.
node.enter().append("circle")
.attr("class", "node")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", function(d) { return Math.sqrt(d.size) / 10 || 4.5; })
.style("fill", color)
.on("click", click)
.call(force.drag);
and now change the tick function as follows
function tick() {
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("transform", function(d) {
return "translate("+d.x+","+d.y+")";
});
}
Now all other functionalities should work as expected.

Drag, drop and fix a node in D3JS

I have a HTML File to display graphs using D3JS. The JSFiddle is in this link here. I know that I must use the function to enable the fixing of node position on dragging and dropping:
var drag = force.drag()
.on("dragstart", dragstart);
function dragstart(d) {
d3.select(this).classed("fixed", d.fixed = true);
}
However, on dragging and dropping a node, I am unable to fix the position. I want the same functionality as shown in this link .I don't want the node to revert to its original position. How do I change it?

From this example : http://bl.ocks.org/mbostock/3750558
You need to add a call to drag function :
var drag = force.drag()
.on("dragstart", dragstart);
Which is the following :
function dragstart(d) {
d3.select(this).classed("fixed", d.fixed = true);
}
The key point is setting d.fixed to true.
EDIT
In your fiddle you weren't calling node_drag. So you need to call that on the nodes like so :
var node = gnodes.append("circle")
.attr("class", "node")
.attr("r", 5)
.style("fill", function(d) {
thelistofcolors[d.group] = color(d.group);
return color(d.group); })
.call(node_drag); // <<<<<<<this line
And then change the tick to a function so you can call it later :
force.on("tick", tick);
function tick() {
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; });
gnodes.attr("transform", function(d) {
return 'translate(' + [d.x, d.y] + ')';
});
};
Updated fiddle with all data showing (not filtered on click) : https://jsfiddle.net/vgy1s8k3/4/

The solution is to set a 'fixed' node property to true on dragstart, this will allow to append the position.
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="//d3js.org/d3.v3.min.js"></script>
<style>
.node {
stroke: #fff;
stroke-width: 1.5px;
}
.link {
stroke: #999;
stroke-opacity: .6;
}
</style>
</head>
<body>
<script>
var width = 1280,
height = 960;
var color = d3.scale.category20();
var force = d3.layout.force()
.charge(-120)
.linkDistance(30)
.size([width, height]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
d3.json("graph.json", function(error, graph) {
if (error) throw error;
force
.nodes(graph.nodes)
.links(graph.links)
.start();
var link = svg.selectAll("graph.link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value); });
var node = svg.selectAll("graph.node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 5)
.style("fill", function(d) { return color(d.fill); })
.call(force.drag);
var drag = force.drag()
.on("dragstart", dragstart);
function dragstart(d) {
d.fixed = true;
}
node.append("title")
.text(function(d) { return d.name });
force.on("tick", tick);
function tick() {
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("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
};
});
</script>
</body>
</html>

Displaying Node label in a dynamic forcelayout graph in D3.js

I'm trying to visualize a graph using D3.js via web sockets. I'm trying to display node label ( can be seen in the code below ), but it does not seem to appear at all. Please see the function start(). What is wrong here?
<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>

You will have to group the circles and corresponding labels for each node. Try this way.
node = node.data(force.nodes(), function(d) { return d.id;})
.enter().append("g")
.attr("class", "node")
.call(drag);
node.append("circle")
.attr("r", 5)
.style("fill", function(d) { return color(d.group); });
node.append("text")
.attr("dx", 12)
.attr("dy", ".35em")
.text(function(d) { return d.name });
Also update the tick function as shown below.
function tick() {
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("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
}

By default text elements are of the white color. Add .style("fill", "black"), so you can see them.
node.append("text")
.attr("dx", 12)
.attr("dy", ".35em")
.style("fill", "black")
.text(function(d) { return d.name });
Also your node is the <circle> element. You can't append <text> element to the <circle> element ( it's not a container ). Use a <g> element and append <circle> and <text> to it or append <text> element to the <svg> element.

How to hide labels with d3?

I am making a timeline sort of project. As of right now, my code looks like the following:
var width = 960,
height = 500;
var color = d3.scale.category20();
var force = d3.layout.force()
.charge(-300)
.linkDistance(30)
.size([width, height]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
d3.json("input.json", function(error, graph) {
force
.nodes(graph.nodes)
.links(graph.links)
.start();
var link = svg.selectAll(".link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value); })
.style("visibility", function(d) {
return d.value == 2 ? "hidden" : "visible";
});
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 20)
.style("fill", function(d) { return color(d.group); })
.call(force.drag)
.style("visibility", function(d) {
return d.group == 1 ? "hidden" : "visible";
})
.on("mouseover", function(d) {
if(d.group == 2) {
node.filter(function(d) { return d.group == 1; }).style("visibility", "visible");
link.filter(function(d) { return d.value == 2; }).style("visibility", "visible");
texts.filter(function(d) { return d.value == 2; }).style("visibility", "visible");
}
}).on("mouseout", function(d) {
if(d.group == 2) {
node.filter(function(d) { return d.group == 1; }).style("visibility", "hidden");
link.filter(function(d) { return d.value == 2; }).style("visibility", "hidden");
}
});
var texts = svg.selectAll("text.label")
.data(graph.nodes)
.enter().append("text")
.attr("class", "label")
.attr("fill", "black")
.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; });
texts.attr("transform", function(d) {
return "translate(" + d.x + "," + d.y + ")";
});
});
});
As of right now, the text, or labelsconstantly show, even when the nodes and links don't. I'm wondering what I need to do? I don't know if I can assign a value or group to the labels

D3.js - Changing force directed graph node from circle to svg:rect

I'm modifying this example of a collapsible, hierarchical force layout and I'm having trouble changing the nodes from circles to squares (using svg:rect). With my current code, all of the squares appear in the top left hand corner. Otherwise they're behaving relatively normally (I can click on them to expand/collapse the tree).
Here is my CSS styles that I'm using for this and other functions:
.node {
cursor: pointer;
}
.node rect {
fill: skyblue;
stroke: green;
stroke-width: 1.5px;
}
.node text {
font: 10px sans-serif;
}
.link {
fill: none;
stroke: green;
stroke-width: 1.5px;
}
#container div{
float:left;
}
.chartSpace div{
float:left;
margin-right:screen.width-960px;
}
Here is the code for the force layout:
function forceDirected(){
//Clear SVG
d3.select("svg").remove();
var width = 960,
height = 500,
root;
var force = d3.layout.force()
.size([width, height])
.on("tick", tick);
var svg = d3.select(".chartSpace").append("svg")
.attr("width", width)
.attr("height", height);
var link = svg.selectAll(".link"),
node = svg.selectAll(".node");
d3.json("flare.json", function(flare) {
root = flare;
update();
});
function update() {
var nodes = flatten(root),
links = d3.layout.tree().links(nodes);
// Restart the force layout.
force
.nodes(nodes)
.links(links)
.start();
// Update the links…
link = link.data(links, function(d) { return d.target.id; });
// Exit any old links.
link.exit().remove();
// Enter any new links.
link.enter().insert("line", ".node")
.attr("class", "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; });
// Update the nodes…
node = node.data(nodes, function(d) { return d.id; }).style("fill", color);
// Exit any old nodes.
node.exit().remove();
// Enter any new nodes.
node.enter().append("svg:rect")
.attr("class","node")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("width", "6")
.attr("height", "6")
.on("click", click)
.call(force.drag);
}
function tick() {
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; });
}
// Stroke colors
function strColor(d) {
return d._children ? "green" : d.children ? "green" : "green";
}
// Node colors
function color(d) {
return d._children ? "skyblue" : d.children ? "skyblue" : "skyblue";
}
// Toggle children on click.
function click(d) {
if (!d3.event.defaultPrevented) {
if (d.children) {
d._children = d.children;
d.children = null;
} else {
d.children = d._children;
d._children = null;
}
update();
}
}
// Returns a list of all nodes under the root.
function flatten(root) {
var nodes = [], i = 0;
function recurse(node) {
if (node.children) node.children.forEach(recurse);
if (!node.id) node.id = ++i;
nodes.push(node);
}
recurse(root);
return nodes;
}
}

node.enter().append("svg:rect")
.attr("class","node")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
should be
var rectSize = 6;
node.enter().append("svg:rect")
.attr("class","node")
.attr("x", function(d) { return d.x + rectSize/2; })
.attr("y", function(d) { return d.y + rectSize/2; })
.attr("width", rectSize)
.attr("height", rectSize)
rect elements are positioned by setting the location of their upper left hand corner with x and y; circle elements' centers are set with cx and cy.

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