I got a D3 graph in place. Where a click on a node should delete this node and the related link. A hover on each node will display the name of it. Further a console.log confirms the name of the node, which was deleted. The problem I got is, as soon as I try to delete a node which is not the last one from the array, the console confirms the deletion but the node just replaces another one. Where is my thinking mistake?
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Playground</title>
<!-- favcon -->
<link rel="icon" href="https://networkrepository.com/favicon.png">
<!-- call external d3.js framework -->
<script src="https://d3js.org/d3.v4.js"></script>
<!-- import multiselection framework -->
<script src="https://d3js.org/d3-selection-multi.v1.js"></script>
<!-- import "font awesome" stylesheet https://fontawesome.com/ -->
<script src="https://kit.fontawesome.com/39094309d6.js" crossorigin="anonymous"></script>
</head>
<style>
body {
overflow: hidden;
margin: 0px;
}
.canvas {
background-color: rgb(220, 220, 220);
}
.link {
stroke: rgb(0, 0, 0);
stroke-width: 1px;
}
circle {
background-color: whitesmoke;
}
</style>
<body>
<!-- create svg root element as a canvas -->
<svg id="svg"></svg>
<!-- call script where the main application is written -->
<script>
var graph = {
"nodes": [
{
"id": 0,
"type": "company",
"name": "Company",
"context": [
{
"name": "Company"
}
],
"icon": "\uf1ad"
},
{
"id": 1,
"type": "software",
"name": "Software_1",
"context": [
{
"name": "Software_1"
}
],
"icon": "\uf7b1",
"parent": 1
},
{
"id": 2,
"type": "software",
"name": "Software_2",
"context": [
{
"name": "Software_2"
}
],
"icon": "\uf78d",
"parent": 1
},
{
"id": 3,
"type": "software",
"name": "Software_3",
"context": [
{
"name": "Software_3"
}
],
"icon": "\ue084",
"parent": 1
},
{
"id": 4,
"type": "software",
"name": "Software_4",
"context": [
{
"name": "Software_4"
}
],
"icon": "\ue084",
"parent": 1
},
{
"id": 5,
"type": "software",
"name": "Software_5",
"context": [
{
"name": "Software_5"
}
],
"icon": "\ue084",
"parent": 4
},
{
"id": 6,
"type": "software",
"name": "Software_6",
"context": [
{
"name": "Software_6"
}
],
"icon": "\ue084",
"parent": 4
},
{
"id": 7,
"type": "software",
"name": "Software_7",
"context": [
{
"name": "Software_7"
}
],
"icon": "\ue084",
"parent": 5
},
{
"id": 8,
"type": "software",
"name": "Software_8",
"context": [
{
"name": "Software_8"
}
],
"icon": "\ue084",
"parent": 5
}
],
"links": [
{
"source": 1,
"target": 0,
"type": "uses"
},
{
"source": 2,
"target": 0,
"type": "uses"
},
{
"source": 3,
"target": 0,
"type": "uses"
},
{
"source": 4,
"target": 0,
"type": "uses"
},
{
"source": 5,
"target": 3,
"type": "uses"
},
{
"source": 6,
"target": 3,
"type": "uses"
},
{
"source": 7,
"target": 4,
"type": "uses"
},
{
"source": 8,
"target": 4,
"type": "uses"
}
]
}
// declare initial variables
var svg = d3.select("svg")
width = window.innerWidth
height = window.innerHeight
node = null
link = null
// define cavnas area to draw everything
svg = d3.select("svg")
.attr("class", "canvas")
.attr("width", width)
.attr("height", height)
.call(d3.zoom().on("zoom", function () {
svg.attr("transform", d3.event.transform)
}))
.append("g")
// remove zoom on dblclick listener
d3.select("svg").on("dblclick.zoom", null)
// append markers to svg
svg.append('defs').append('marker')
.attrs({
'id': 'arrowhead',
'viewBox': '-0 -5 10 10',
'refX': 14,
'refY': 0,
'orient': 'auto',
'markerWidth': 30,
'markerHeight': 30,
'xoverflow': 'visible'
})
.append('svg:path')
.attr('d', 'M 0,-2 L 4 ,0 L 0,2')
.attr('fill', 'black')
.style('stroke', 'none');
var linksContainer = svg.append("g").attr("class", "linksContainer")
var nodesContainer = svg.append("g").attr("class", "nodesContainer")
// iniital force simulation
var simulation = d3.forceSimulation()
.force("link", d3.forceLink().id(function (d) { return d.id; }).distance(100))
.force("charge", d3.forceManyBody().strength(-400))
.force("center", d3.forceCenter(width / 2, height / 2))
.force("attraceForce", d3.forceManyBody().strength(70));
//create links
link = linksContainer.selectAll(".link")
.data(graph.links)
.enter()
.append("line")
.attr("class", "link")
.style("pointer-events", "none")
.attr('marker-end', 'url(#arrowhead)')
linkPaths = linksContainer.selectAll(".linkPath")
.data(graph.links)
.enter()
.append('path')
.style("pointer-events", "none")
.attrs({
'class': 'linkPath',
'id': function (d, i) { return 'linkPath' + i }
})
linkLabels = linksContainer.selectAll(".linkLabel")
.data(graph.links)
.enter()
.append('text')
.style("pointer-events", "none")
.attrs({
'class': 'linkLabel',
'id': function (d, i) { return 'linkLabel' + i },
'font-size': 12,
'fill': 'black'
})
linkLabels.append('textPath')
.attr('xlink:href', function (d, i) { return '#linkPath' + i })
.style("text-anchor", "middle")
.style("pointer-events", "none")
.attr("startOffset", "50%")
.text(function (d) { return d.type })
node = nodesContainer.selectAll(".node")
.data(graph.nodes)
.enter()
.append("g")
.attr("class", "node")
.attr("stroke", "white")
.attr("stroke-width", "2px")
.call(d3.drag()
.on("start", dragStarted)
.on("drag", dragged)
.on("end", dragEnded)
)
node.append("circle")
.attr("r", 30)
.style("fill", "whitesmoke")
.on("click", removeNode)
node.append("title")
.text(function (d) { return d.name })
node.append("text")
.style("class", "icon")
.attr("font-family", "FontAwesome")
.attr("dominant-baseline", "central")
.attr("text-anchor", "middle")
.attr("font-size", 30)
.attr("fill", "black")
.attr("stroke-width", "0px")
.attr("pointer-events", "none")
.text(function (d) { return d.icon })
simulation
.nodes(graph.nodes)
.on("tick", ticked);
simulation
.force("link")
.links(graph.links)
function addNode(d) {
var newid = graph.nodes.length + 1
graph.links.push({ source: newid, target: d.id, type: "uses" })
graph.nodes.push({
"id": newid,
"type": "software",
"name": "Node",
"context": [
{
"name": d.name
}
],
"icon": "\ue084",
"parent": d.id,
})
link = linksContainer.selectAll(".link")
.data(graph.links)
.enter()
.append("line")
.attr("class", "link")
.style("pointer-events", "none")
.attr('marker-end', 'url(#arrowhead)')
.style("display", "block")
.merge(link)
linkPaths = linksContainer.selectAll(".linkPath")
.data(graph.links)
.enter()
.append('path')
.style("pointer-events", "none")
.attrs({
'class': 'linkPath',
'fill-opacity': 1,
'stroke-opacity': 1,
'id': function (d, i) { return 'linkPath' + i }
})
.merge(linkPaths)
linkLabels = linksContainer.selectAll(".linkLabel")
.data(graph.links)
.enter()
.append('text')
.style("pointer-events", "none")
.attrs({
'class': 'linkLabel',
'id': function (d, i) { return 'linkLabel' + i },
'font-size': 12,
'fill': 'black'
})
.merge(linkLabels)
linkLabels.append('textPath')
.attr('xlink:href', function (d, i) { return '#linkPath' + i })
.style("text-anchor", "middle")
.style("pointer-events", "none")
.attr("startOffset", "50%")
.text(function (d) { return d.type })
.merge(linkLabels)
node = nodesContainer.selectAll(".node")
.data(graph.nodes)
.enter()
.append("g")
.attr("class", "node")
.attr("stroke", "white")
.attr("stroke-width", "2px")
.call(d3.drag()
.on("start", dragStarted)
.on("drag", dragged)
.on("end", dragEnded)
)
.merge(node)
node.append("circle")
.attr("r", 30)
.style("fill", "whitesmoke")
.on("click", removeNode)
.merge(node)
node.append("text")
.style("class", "icon")
.attr("font-family", "FontAwesome")
.attr("dominant-baseline", "central")
.attr("text-anchor", "middle")
.attr("font-size", 30)
.attr("fill", "black")
.attr("stroke-width", "0px")
.attr("pointer-events", "none")
.text(function (d) { return d.icon })
.merge(node)
simulation.nodes(graph.nodes);
simulation.force("link").links(graph.links);
//reheat the simulation
simulation.alpha(0.3).restart()
}
function removeNode(d) {
var indexOfNodes = graph.nodes.indexOf(d)
var indexOfLinks = graph.links.findIndex(element => element.source.id == d.id)
graph.links.splice(indexOfLinks, 1)
linksContainer.selectAll(".link")
.data(graph.links)
.exit()
.remove()
linkPaths
.data(graph.links)
.exit()
.remove()
graph.nodes.splice(indexOfNodes, 1)
nodesContainer.selectAll(".node")
.data(graph.nodes)
.exit()
.remove()
simulation.nodes(graph.nodes);
simulation.force("link").links(graph.links);
//reheat the simulation
simulation.alpha(0.3).restart()
console.log("Node: " + d.name + " deleted.")
}
function ticked() {
// update link positions
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 node positions
node
.attr("transform", function (d) { return "translate(" + d.x + ", " + d.y + ")"; });
linkPaths.attr('d', function (d) {
return 'M ' + d.source.x + ' ' + d.source.y + ' L ' + d.target.x + ' ' + d.target.y;
});
linkLabels.attr('transform', function (d) {
if (d.target.x < d.source.x) {
var bbox = this.getBBox();
rx = bbox.x + bbox.width / 2;
ry = bbox.y + bbox.height / 2;
return 'rotate(180 ' + rx + ' ' + ry + ')';
}
else {
return 'rotate(0)';
}
});
}
function dragStarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragEnded(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = undefined;
d.fy = undefined;
}
</script>
</body>
</html>