D3 Examples - timed graph, psychology on race

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
div.tooltip {
  position: absolute;
  text-align: left;
​
  
      width: 330px;
    background-color: #ffffff;
    padding: 3px 12px;
    font-family: serif;
    border: 1px solid #bbbbbb;
    box-shadow: 1px 1px 4px #bbbbbb;
    font-family: EB Garamond, serif;
    text-transform: capitalize;
  
  
  background: rgba(255,255,255, 0.9);
  
  
  
}
​
​
.links line {
  stroke: #999;
  stroke-opacity: 0.6;
}
​
.nodes circle {
  stroke: #fff;
  stroke-width: 1.5px;
}
​
.nodes circle:hover {
  stroke: #ddd;
  stroke-width: 1.5px;
}
 
​
a {
    color: #108b99;
    text-decoration: underline dotted;
}
​
​
h2 {
    margin-top: 3pt;
    margin-bottom: -5pt;
    text-align: left;
    font-family: 'Alegreya SC', serif;
    font-size: 11pt;
    font-weight: 300;
    letter-spacing: 2.5px;
}
  
  
  
  
  
</style>
<body>
<svg width="960" height="600" ></svg>
​
​
</body>
​
​
<link type="text/css" href="index.css" rel="stylesheet"/>
<link href="https://fonts.googleapis.com/css?family=Alegreya|Alegreya+SC|Alegreya+Sans|Alegreya+Sans+SC|Cormorant+Garamond|Cormorant+SC:300,400,500,600,700|EB+Garamond|Fanwood+Text:400,400i|Goudy+Bookletter+1911|IM+Fell+Double+Pica+SC|IM+Fell+French+Canon+SC|IM+Fell+French+Canon:400,400i|IM+Fell+Great+Primer+SC|IM+Fell+Great+Primer:400,400i|Spectral+SC:200,200i,300,300i,400,400i,500,500i,600,600i,700,700i,800,800i|Vollkorn+SC:400,600,700,900&amp;subset=latin-ext" rel="stylesheet">
​
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");
​
var color = d3.scaleOrdinal(d3.schemeCategory20);
var searchRadius = 40;
  
  
 var div = d3.select("body").append("div")
    .attr("class", "tooltip")
    .style("opacity", 0);
​
​
var simulation = d3.forceSimulation()
    .force("link", d3.forceLink().id(function(d) { return d.id; }))
    .force("charge", d3.forceManyBody().strength(-25))
    .force("center", d3.forceCenter(width / 2, height / 1.5));
  
var tooltip = d3.select("body")
    .append("div")
      .attr("class", "tooltip")
      .style("position", "absolute")
      .style("z-index", "10")
      .style("visibility", "hidden");
​
d3.json("race.json", function(error, graph) {
  if (error) throw error;
​
  
        var y = d3.scaleTime()
        .domain([1971,2017])
        .range([0, height]);
      svg.append("g")
      .call(d3.axisLeft(y));
​
  // text label for the y axis
  svg.append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 0 )
      .attr("x",0 - (height / 2))
      .attr("dy", "1em")
      .style("text-anchor", "middle")
      .text("Value");      
​
  
  
  
  
  
  
  
  
  
  
  
  
  
  var link = svg.append("g")
      .attr("class", "links")
    .selectAll("line")
    .data(graph.links)
    .enter().append("line")
      .attr("stroke-width", function(d) { return Math.sqrt(d.value); });
​
​
  
  
​
  var node = svg.append("g")
      .attr("class", "nodes")
    .selectAll("circle")
    .data(graph.nodes)
    .enter().append("circle")
      .attr("r", 5)
      .attr("fill", function(d) { return color(d.cluster); })
  .on("mouseover", function(d) {
       div.transition()
         .duration(200)
         .style("opacity", .9)
      /* div.html("<h2 >" + (d.label) + "</h2>" +  "<p>" + (d.title) + "</p>" + "<p>" +  (d.source)+ ", "+ (d.year))*/
       div .html(
        '<a href="'+(d.url ? d.url + "" : "")+'" target="_blank">' + "<h2 >" + (d.label) + "</h2>" + "</a>" + "<p>" + (d.title) + "</p>" + "<p>" +  (d.source)+ ", "+ (d.year))
         .style("left", (d3.event.pageX+30) + "px")
         .style("top", (d3.event.pageY - 28) + "px");
       })
  .on("mouseout", function(d) {
       div.transition()
         .duration(6000)
         .style("opacity", 0);
       })
  
  
                .call(d3.drag()
          .on("start", dragstarted)
          .on("drag", dragged)
          .on("end", dragended))  ;
​
  node.append("title")
      .text(function(d) { return d.id; });
​
  simulation
      .nodes(graph.nodes)
      .on("tick", ticked);
​
  simulation.force("link")
      .links(graph.links);
​
  function ticked() {
    node.each(function(d) {
    
    d.y = d.py = (d.year-1971)*10;
  });
    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; });
  }
});
​
  function dragsubject() {
    return simulation.find(d3.event.x - width / 2, d3.event.y - height / 2 , searchRadius);
  }
​
function mousemoved() {
    var a = this.parentNode, m = d3.mouse(this), d = simulation.find(m[0] - width / 2, m[1] - height / 2, 40);
    if (!d) return a.removeAttribute("href"), a.removeAttribute("title"), tooltip.style('visibility','hidden');
    a.setAttribute("href", "" + (d.url ? d.url + "" : ""));//+ d.id
    a.setAttribute("title", d.id + (d.url ? " by " + d.url : "") + (d.description ? "\n" + d.description : ""));
    loadTooltipThumb(d);
  }
​
​
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 = null;
  d.fy = null;
}
​
</script>
​
    