search collapsible tree path highlighted

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<!DOCTYPE html>
<meta charset="utf-8">

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

.found {
		fill: #ff4136;
		stroke: #ff4136;
	}
	.node text {
		font: 10px sans-serif;
	}

.link {
		fill: none;
		stroke: #ccc;
		stroke-width: 1.5px;
	}
	/*Just to ensure the select2 box is "glued" to the top*/
	.search {
	  width: 100%;
	}
</style>
<link rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/select2/3.5.0/select2.min.css"></link>

<script type="text/javascript">

//basically a way to get the path to an object
	function searchTree(obj,search,path){
		if(obj.name === search){ //if search is found return, add the object to the path and return it
			path.push(obj);
			return path;
		}
		else if(obj.children || obj._children){ //if children are collapsed d3 object will have them instantiated as _children
			var children = (obj.children) ? obj.children : obj._children;
			for(var i=0;i<children.length;i++){
				path.push(obj);// we assume this path is the right one
				var found = searchTree(children[i],search,path);
				if(found){// we were right, this should return the bubbled-up path from the first if statement
					return found;
				}
				else{//we were wrong, remove this parent from the path and continue iterating
					path.pop();
				}
			}
		}
		else{//not the right object, return false so it will continue to iterate in the loop
			return false;
		}
	}

var div = d3.select("body")
		.append("div") // declare the tooltip div
		.attr("class", "tooltip")
		.style("opacity", 0);

var margin = {top: 20, right: 120, bottom: 20, left: 120},
		width = 960 - margin.right - margin.left,
		height = 800 - margin.top - margin.bottom;

var i = 0,
		duration = 750,
		root,
		select2_data;

var diameter = 960;

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 + ")");

//recursively collapse children
	function collapse(d) {
		if (d.children) {
			d._children = d.children;
			d._children.forEach(collapse);
			d.children = null;
		}
	}

// Toggle children on click.
	function click(d) {
		if (d.children) {
			d._children = d.children;
			d.children = null;
	  	}
	  	else{
			d.children = d._children;
			d._children = null;
	  	}
		update(d);
	}

d3.json("flare.json", function(error,values){
		root = values;
		select2_data = extract_select2_data(values,[],0)[1];//I know, not the prettiest...
		root.x0 = height / 2;
		root.y0 = 0;
		root.children.forEach(collapse);
		update(root);
		//init search box
		$("#search").select2({
			data: select2_data,
			containerCssClass: "search"
		});
	});
	//attach search box listener
	$("#search").on("select2-selecting", function(e) {
		var paths = searchTree(root,e.object.text,[]);
		if(typeof(paths) !== "undefined"){
		  d3.selectAll("circle").style("fill", function(d) {
		    d.class=""
			});
			openPaths(paths);
		}
		else{
			alert(e.object.text+" not found!");
		}
	})

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

function update(source) {
		// Compute the new tree layout.
		var nodes = tree.nodes(root).reverse(),
		links = tree.links(nodes);

// Normalize for fixed-depth.
		nodes.forEach(function(d) { d.y = d.depth * 180; });

// Update the nodesâ€¦
		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 + ")"; })
		.on("click", click);

nodeEnter.append("circle")
		.attr("r", 1e-6)
		.style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

nodeEnter.append("text")
			.attr("x", function(d) { return d.children || d._children ? -10 : 10; })
			.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);

// 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", 4.5)
			.style("fill", function(d) {
				if(d.class === "found"){
					return "#ff4136"; //red
				}
				else if(d._children){
					return "lightsteelblue";
				}
				else{
					return "#fff";
				}
			})
			.style("stroke", function(d) {
				if(d.class === "found"){
					return "#ff4136"; //red
				}
		});

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

// Transition exiting nodes to the parent's new position.
		var nodeExit = node.exit().transition()
			.duration(duration)
			.attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
			.remove();

nodeExit.select("circle")
			.attr("r", 1e-6);

nodeExit.select("text")
			.style("fill-opacity", 1e-6);

// Update the linksâ€¦
		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) {
				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)
			.style("stroke",function(d){
				if(d.target.class==="found"){
					return "#ff4136";
				}
			});

// Transition exiting nodes to the parent's new position.
		link.exit().transition()
			.duration(duration)
			.attr("d", function(d) {
				var o = {x: source.x, y: source.y};
				return diagonal({source: o, target: o});
			})
			.remove();

// Stash the old positions for transition.
		nodes.forEach(function(d) {
			d.x0 = d.x;
			d.y0 = d.y;
		  });
	}
</script>
</html>

https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.min.js

https://cdnjs.cloudflare.com/ajax/libs/select2/3.5.0/select2.min.js

https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js