This example describes the relationships between all the co-authors of a researcher. Basically, 2 researchers are linked if they've published a paper together.
Json. This document explains how to get this format from a classic table.<!DOCTYPE html>
<meta charset="utf-8">
<!-- Load d3.js -->
<script src="https://d3js.org/d3.v4.js"></script>
<!-- Load color palette -->
<script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script>
<!-- Create a div where the graph will take place -->
<div id="my_dataviz"></div>
<script>
// set the dimensions and margins of the graph
var margin = {top: 0, right: 30, bottom: 50, left: 60},
width = 650 - margin.left - margin.right,
height = 400 - margin.top - margin.bottom;
// append the svg object to the body of the page
var svg = d3.select("#my_dataviz")
.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")");
// Read dummy data
d3.json("https://raw.githubusercontent.com/holtzy/D3-graph-gallery/master/DATA/data_researcherNetwork.json", function( data) {
// List of node names
var allNodes = data.nodes.map(function(d){return d.name})
// List of groups
var allGroups = data.nodes.map(function(d){return d.grp})
allGroups = [...new Set(allGroups)]
// A color scale for groups:
var color = d3.scaleOrdinal()
.domain(allGroups)
.range(d3.schemeSet3);
// A linear scale for node size
var size = d3.scaleLinear()
.domain([1,10])
.range([2,10]);
// A linear scale to position the nodes on the X axis
var x = d3.scalePoint()
.range([0, width])
.domain(allNodes)
// In my input data, links are provided between nodes -id-, NOT between node names.
// So I have to do a link between this id and the name
var idToNode = {};
data.nodes.forEach(function (n) {
idToNode[n.id] = n;
});
// Add the links
var links = svg
.selectAll('mylinks')
.data(data.links)
.enter()
.append('path')
.attr('d', function (d) {
start = x(idToNode[d.source].name) // X position of start node on the X axis
end = x(idToNode[d.target].name) // X position of end node
return ['M', start, height-30, // the arc starts at the coordinate x=start, y=height-30 (where the starting node is)
'A', // This means we're gonna build an elliptical arc
(start - end)/2, ',', // Next 2 lines are the coordinates of the inflexion point. Height of this point is proportional with start - end distance
(start - end)/2, 0, 0, ',',
start < end ? 1 : 0, end, ',', height-30] // We always want the arc on top. So if end is before start, putting 0 here turn the arc upside down.
.join(' ');
})
.style("fill", "none")
.attr("stroke", "grey")
.style("stroke-width", 1)
// Add the circle for the nodes
var nodes = svg
.selectAll("mynodes")
.data(data.nodes.sort(function(a,b) { return +b.n - +a.n }))
.enter()
.append("circle")
.attr("cx", function(d){ return(x(d.name))})
.attr("cy", height-30)
.attr("r", function(d){ return(size(d.n))})
.style("fill", function(d){ return color(d.grp)})
.attr("stroke", "white")
// And give them a label
var labels = svg
.selectAll("mylabels")
.data(data.nodes)
.enter()
.append("text")
.attr("x", 0)
.attr("y", 0)
.text(function(d){ return(d.name)} )
.style("text-anchor", "end")
.attr("transform", function(d){ return( "translate(" + (x(d.name)) + "," + (height-15) + ")rotate(-45)")})
.style("font-size", 6)
// Add the highlighting functionality
nodes
.on('mouseover', function (d) {
// Highlight the nodes: every node is green except of him
nodes
.style('opacity', .2)
d3.select(this)
.style('opacity', 1)
// Highlight the connections
links
.style('stroke', function (link_d) { return link_d.source === d.id || link_d.target === d.id ? color(d.grp) : '#b8b8b8';})
.style('stroke-opacity', function (link_d) { return link_d.source === d.id || link_d.target === d.id ? 1 : .2;})
.style('stroke-width', function (link_d) { return link_d.source === d.id || link_d.target === d.id ? 4 : 1;})
labels
.style("font-size", function(label_d){ return label_d.name === d.name ? 16 : 2 } )
.attr("y", function(label_d){ return label_d.name === d.name ? 10 : 0 } )
})
.on('mouseout', function (d) {
nodes.style('opacity', 1)
links
.style('stroke', 'grey')
.style('stroke-opacity', .8)
.style('stroke-width', '1')
labels
.style("font-size", 6 )
})
})
</script>