D3js Binary Tree

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <meta name="theme-color" content="#000000">
  <link rel="manifest" href="%PUBLIC_URL%/manifest.json">
  <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
  <link rel="stylesheet" href="/styles.css">
    <script src="//d3js.org/d3.v3.min.js"></script>
  <script type ="text/javascript" src="./binarytree.js"></script>
  <title>Binary Tree</title>
</head>
<style>

.node {
}

.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 1.5px;
}

.node text {
  font: 10px sans-serif;
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 1.5px;
}

.container{
  display:flex;
  flex-direction:column;
}

.addData{
  display:flex;
}

</style>

<body>
  <noscript>
    You need to enable JavaScript to run this app.
  </noscript>
  <div class="container">
  <button onClick="logTree()"> Console Log Tree </button>
    <button onClick="search('in-order')"> Search In-Order</button>
    <button onClick="search('pre-order')"> Search Pre-Order</button>
    <button onClick="search('post-order')"> Search Post-Order</button>

var i = 0,
    duration = 750,
    root;

var tree = d3.layout.tree()
    .size([height, width]);

var diagonal = d3.svg.diagonal()
    .projection(function(d) { return [d.y, d.x]; });

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.right + margin.left)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

// problem is that you cant set parent property with the 
// weird [empty, BST] i set up
let newBST = new BST(50,50)
newBST.insert(20,20)
newBST.insert(60,60)
newBST.insert(70,70)
newBST.insert(80,80)
newBST.insert(10,10)
newBST.insert(15,15)
newBST.insert(5,5)
newBST.insert(1,1)
newBST.insert(100,100)

root = newBST;
root.x0 = height / 2;
root.y0 = 0;

update(root);

d3.select(self.frameElement).style("height", "800px");

function newTree(){
  let value = parseInt(document.getElementById('treeValue').value),
      newBST = new BST(value,value)
  update(newBST)
}

function update(source) {

// Compute the new tree layout.
  var nodes = tree.nodes(root).reverse().sort((a,b)=> { return a.depth - b.depth}).filter((d)=>{ return d.value != null}),
      links = tree.links(nodes).filter((d)=>{ return d.target.value != null});
  
  
  // Normalize for fixed-depth.
  nodes.forEach(function(d,i) {    
    if(nodes[i].parent){
      if(nodes[i].parent.value >= nodes[i].value){
        nodes[i].x = nodes[i].parent.x + 50
      }else if(nodes[i].parent.value < nodes[i].value){
        nodes[i].x = nodes[i].parent.x - 50 
      }
    } 
    d.y = d.depth * 100; 
  });
  
  
  // Update the nodes…
  var node = svg.selectAll("g.node")
      .data(nodes, function(d) { return d.id || (d.id = ++i); });

// Enter any new nodes at the parent's previous position.
  var nodeEnter = node.enter().append("g")
      .attr("class", "node")
      .attr("transform", function(d) { 
       
        return "translate(" + source.y0 + "," + source.x0 + ")"; })

nodeEnter.append("circle")
      .attr("r", 1e-6)
      .attr('id', (d,i)=>{
        return 'circle' + nodes[i].id
      })
      .style("fill", function(d,i) { 
    return d._children ? "lightsteelblue" : "#fff"; 
    });

nodeEnter.append("text")
      .attr("x", function(d) { return d.children || d._children ? -20 : 20; })
      .attr("dy", ".35em")
      .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; })
      .text(function(d) { return d.name; })
      .style("fill-opacity", 1e-6)
      .style("font-size", "20px");

// Transition nodes to their new position.
  var nodeUpdate = node.transition()
      .duration(duration)
      .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });

nodeUpdate.select("circle")
      .attr("r", (d,i)=>{
        return 12
      })
      .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

nodeUpdate.select("text")
      .style("fill-opacity", 1);

// Update the links…
  var link = svg.selectAll("path.link")
      .data(links, function(d) { return d.target.id; });

// Enter any new links at the parent's previous position.
  link.enter().insert("path", "g")
      .attr("class", "link")
      .attr("d", function(d,i) {
        var o = {x: source.x0, y: source.y0};
        return diagonal({source: o, target: o});
      });

// Transition links to their new position.
  link.transition()
      .duration(duration)
      .attr("d", diagonal);

}

function addData(){
  let value = parseInt(document.getElementById('value').value)
  newBST.insert(value,value) 
  update(newBST)
}

function logTree(d){
  console.log(root) 
}

function search(order){
  let queue = newBST.depthFirstTraversal(order).reverse(),
      interval = setInterval(highlight, 700)

function highlight(id){
    let popped = queue.pop()
        currentNode = '#circle' + popped

svg.selectAll(currentNode)
    .transition() // First fade to green.
      .style("fill", "green")
    .transition() // Then red.
      .style("fill", "red")
    .transition() // Wait one second. Then brown, and remove.
      .delay(1000)
      .style("fill", "white")

if(queue.length == 0 ){
      clearInterval(interval)
    }

}
}

</script>

</body>

</html>

https://d3js.org/d3.v3.min.js