D3 Examples - Legislative Yuan similarity

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<!DOCTYPE html>
<html>
  <head>
    <script src="https://cdn.jsdelivr.net/npm/d3@2.10.3/d3.v2.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
    <script src="https://cdn.jsdelivr.net/gh/betamos/better-autocomplete/develop/src/jquery.better-autocomplete.js"></script>
  
  <style type="text/css">
    .link {
  stroke: #999;
  stroke-opacity: .6;
}
  </style>
  </head>
<body>
<div id="chart">
  <form id="search">
    Legislator: <input type="text" />
    <input type="submit" />
  </form>
</div>
<script type="text/javascript">
​
var width = 960,
    height = 500
    color = d3.scale.ordinal().range(["#0B009A", "#009A16", "#FF821A", "#DAAA6E", "#A5A5A5", "#F45399"]);
​
var link;
​
var svg = d3.select("#chart").append("svg")
    .attr("width", width)
    .attr("height", height);
    
var force = d3.layout.force().size([width, height])
    .charge(-50);
    
d3.json("names.json", function(nameSet) {
  d3.json("links.json", function(linkSet) {
  console.log(nameSet.Label)
  
 linkSet.forEach(function(d) {
    d.source = nameSet[d.sourceID - 1];
    d.target = nameSet[d.targetID - 1];
    d.relation = +d.relation;
  });
  
  force
    .nodes(nameSet)
    .start();
​
  var node = svg.selectAll(".node")
    .data(nameSet)
  .enter().append("circle")
    .attr("r", 6)
    .attr("class", "node")
    .attr("fill", function(d) { return color(d.Party); })
    .call(force.drag);
  
  force.on("tick", function() {
   node.attr("cx", function(d) { return d.x; })
       .attr("cy", function(d) { return d.y; });
  });
  node.append("title")
      .text(function(d) { return d.Label; });
 
 
      
  node.on("mousedown", function() {
    var linkID = d3.select(this).datum().ID;
    drawLinks(linkID)
    });
  
$('#search').submit(function() {
  
  var searchTerm = $('input').val();
  var searchFilter = nameSet.filter(function(d) { return d.Label === searchTerm; });
  var searchID = searchFilter[0].ID;
  drawLinks(searchID)
   return false; 
  });
    
  function drawLinks(a) {
    
    svg.selectAll(".link").remove()
    
    var filterLinks = linkSet.filter(function(d) { return d.sourceID === a; });
    
   force
    .nodes(nameSet)
    .links(filterLinks)
    .linkDistance(function(d) { return -d.relation + 120; })
    .start();
    
    console.log(a)
    console.log(filterLinks)
    
    var link = svg.selectAll("line")
        .data(filterLinks)
      .enter().append("svg:line")
        .attr("class", "link");
    
    force.on("tick", function() {    
      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; });
      });
    };
  
 });
});
  
</script>
</body>
</html>
​
    