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Collapsable force layout with nested selections

The json data has to have nested elements called "children"

<meta charset="utf-8" />
        
<link href='https://fonts.googleapis.com/css?family=Life+Savers|Didact+Gothic' rel='stylesheet' type='text/css'>		
<meta charset="utf-8" />
  
<style>
    .node {
      stroke: #009900;
      stroke-width: 1.5px;
      color: #009900;
     
    }
     
     
    .node text {
      pointer-events: none;
      font: 15px sans-serif;
      stroke-width: 0px;
    }
     
    .link {
      stroke: #999;
      /* stroke-opacity: 2.6; */
    }
     
     
     
    path.link {
      fill: none;
      stroke-width: 2px;
    }
     
     
    marker#end {
      fill: #999;
     
    }
     
    line {
      stroke: #000;
      stroke-width: 1.5px;
    }
</style>

<script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>

<body>

<script>
    var w = 1200,
        h = 800,
        maxNodeSize = 50,
        root;
     
    var vis;
    var force = d3.layout.force(); 
    
    vis = d3.select("body").append("svg");
     
    d3.json("collapsableforcelayoutwithicons.json", function(json) {
     
    	root = json;
    	root.fixed = true;
    	root.x = w / 2;
    	root.y = 120;
     
     
            // Build the arrow
    	var defs = vis.insert("svg:defs").selectAll("marker")
    	    .data(["end"]);
     
     
    	defs.enter().append("svg:marker")
    	    .attr("id", "end")               // As explained here: https://www.d3noob.org/2013/03/d3js-force-directed-graph-example-basic.html
    	    //.attr("viewBox", "0 -5 10 10")
    	    .attr("refX", 10)
    	    .attr("refY", 0)
    	    .attr("markerWidth", 6)
    	    .attr("markerHeight", 6)
    	    .attr("orient", "auto")
    	  .append("svg:path")
    	    .attr("d", "M0,-5L10,0L0,5");
     
    	   update();
    });
    
    
    /**
     *   
     */
    function update() {
        console.log('entered update');
    	
        nodes = flatten(root),
        links = d3.layout.tree().links(nodes);
        
       // Start the force layout.
      force.nodes(nodes)
          	.links(links)
          	.gravity(0.05)
    		.charge(-1500)
    		.linkDistance(100)
    		.friction(0.5)
    		.linkStrength(function(l, i) {return 1; })
    		.size([w, h])
    		.on("tick", tick)
          	.start();
       
    	var i = 0;
    	
    
      // Update the paths
      var path = vis.selectAll("path.link")
    	    .data(links, function(d) { return d.target.id; });
    	    
      path.enter().append("svg:path")
    	    .attr("class", "link")
    	    .attr("marker-end", "url(#end)")
    	    .style("stroke", "#ccc");
    	      
      // Exit any old paths.
      path.exit().remove();
      
    
      // Update the nodes…
      var node = vis.selectAll("g.node")
          .data(nodes, function(d) { return d.id; });
    
    
      // Enter any new nodes.
      var nodeEnter = node.enter().append("svg:g")
          .attr("class", "node")
          .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
          .on("click", click)
          //.on("mouseover", showNodeDetails)
          //.on("mouseout", hideNodeDetails)
          .call(force.drag)
          .each(getPersonalDataNodes)
          ;
    
      // Add the circles to the nodes   
      nodeEnter.append("svg:circle")
          .attr("r", setCircleRadius)
          .style("fill", "white")
          .style("stroke", color)
          .style("stroke-width", function(d) { return d.root ? 0 : 1.5})
          .style("opacity", function(d) { return d.root ? 0 : 1})
          ;
      
      
      // Add text to the node (as defined by the json file) 
      nodeEnter.append("svg:text")
          .attr("class", "nodetext")
          .attr("text-anchor", "middle")
          .attr("dx", function(d) { return (d.logowidth/2)|| 16/2; })
          .attr("dy", function(d) { return (d.logoheight/2 + 15) || 16/2 + 15; })
          .text(function(d) { return d.name; });
          
    
            	
      //Add an image to the node
      nodeEnter.append("svg:image")
          .attr("xlink:href",  function(d) { return d.logo;})
          .attr("x", function(d) { return (0 - (d.logowidth/2)) || -16/2;})
          .attr("y", function(d) { return (0 - (d.logoheight/2)) || -16/2;})
          .attr("height", function(d) { return d.logoheight || 16;})
          .attr("width", function(d) { return d.logowidth || 16;})
          //.attr("height", 26)
          //.attr("width", 26);
          ;
    		
      // Exit any old nodes.
      node.exit().remove();
      
    
      // Re-select for update.
      path = vis.selectAll("path.link");
      node = vis.selectAll("g.node");
      
      /*
       * The tick function for the un-nested nodes
       */
      function tick() {
        // Draw curved paths
        path.attr("d", function(d) {
    	
    		 var dx = d.target.x - d.source.x,
    	         dy = d.target.y - d.source.y,
    	         dr = Math.sqrt(dx * dx + dy * dy); //*(Math.random() < 0.5 ? 1 : -1)*(Math.random()/10);
    	    return 	"M" + d.source.x + "," 
    	    			+ d.source.y 
    	    			+ "A" + dr + "," 
    	    			+ dr + " 0 0,1 " 
    	    			+ d.target.x + "," 
    	    			+ d.target.y;
    	});
    		
        node.attr("transform", nodeTransform );    
      }
    }
    
    
    /**
      * Display the children of the nested element:
      * - Position and fix the root node  
      * - Flatten the array of nodes (store it on )
      *  
      */ 
      function getPersonalDataNodes(treenode, i) {
        //console.log('entered getPersonalDataNodes');
        
        var vis2 = d3.select(this);
    
    	// Set the fix root    
        treenode.personaldata.fixed = true;
        treenode.personaldata.x = 0;
        treenode.personaldata.y = 0;
    
    	var icon_size = 16;
    
    	// Flatten the structure - get the array of personaldata objects
        var personaldataNodes = flatten(treenode.personaldata);
            
        // Create the links from the nodes to the root - using the "tree"
        // https://github.com/mbostock/d3/wiki/Tree-Layout 
        var sublinks = d3.layout.tree().links(personaldataNodes);
    	
        // Start the force layout.
    	var forcepii = d3.layout.force()
      		.nodes(personaldataNodes)
      		.links(sublinks)
      		.gravity(-0.005)
    		.linkDistance(50)
         	.start();     
        
         
        // 
        var piilinks = vis2.selectAll("line.piilink")
    	    .data(sublinks, function(d) { return d.target.id; }); // link nodes according to the nodes created during flattning 
    	    	    
    	// Attach a line	    
    	piilinks.enter().append("svg:line")
    	    .attr("class", "piilink")
    	    .style("stroke", "#ccc");
    	      
    	
    	// Exit any old paths.
    	piilinks.exit().remove();
        
        
        // Select the nodes
        var pii = vis2.selectAll("circle.pii")
        	.data(personaldataNodes, function(d) { return d.id; });
        
    	// Group them together
    	var piiEnter = pii.enter().append("svg:g")
            .attr("class", "piinode")
            .attr("transform", function(treenode) { return "translate(" + treenode.x + "," + treenode.y + ")"; })
    		.call(forcepii.drag)
    		;
            
    	// Add a circle        
    	piiEnter.append("svg:circle")
            .attr("class", "pii")
            .attr("r", 5)
    		.style("fill", "lightblue")
      		.style("stroke", "black")
      		;
      		
    	
    	// Add text to the node (as defined by the json file) 
    	piiEnter.append("svg:text")
    		.attr("class", "piinodetext")
    		.attr("text-anchor", "middle")
    		.attr("dx", function(treenode) { return 16/2; })
    		.attr("dy", function(treenode) { return 16/2 + 15; })
    		.text(function(treenode) { return treenode.type; });
    	  
       
    	pii.exit().remove();
    	
    	// Restart
    	sublinks = vis2.selectAll("line.piilinks");
    	personaldataNodes = vis2.selectAll("circle.pii");
    
    	/*
    	 * Tick function for the nested arrays
    	 */
    	forcepii.on("tick", function(treenode){
    		
    		piilinks.attr("x1", function(treenode) { return treenode.source.x; })
    		        .attr("y1", function(treenode) { return treenode.source.y; })
    		        .attr("x2", function(treenode) { return treenode.target.x; })
    		        .attr("y2", function(treenode) { return treenode.target.y; });
    
    		pii.attr("transform", function(treenode) { return "translate(" + treenode.x + "," + treenode.y + ")"; })
        });
        
        
        
      }
    
    
    
    
    
    /**
     * Color leaf nodes dark blue #3182bd, and packages white or blue.
     * dark blue #3182bd
     * light blue #c6dbef
     * orange #fd8d3c
     */ 
    function color(d) {
      return d._children ? "#3182bd" : d.children ? "c6dbef" : "fd8d3c";
    }
    
    
    /**
     * Toggle children on click.
     */ 
    function click(d) {
      //console.log('entered click');
      
      if (d.children) {
        d._children = d.children;
        d.children = null;
      } else {
        d.children = d._children;
        d._children = null;
      }
      
      update();
    }
    
    
    
    /**
     * Returns a list of all nodes under the root.
     */ 
    function flatten(root) {
      
      var nodes = []; 
      var i = 0;
      
      function recurse(node) {
        if (node.children) 
        	node.children.forEach(recurse);
        if (!node.id) 
        	node.id = ++i;
        nodes.push(node);
      }
    
      recurse(root);
      return nodes;
    }
    
    
    /**
     * Gives the coordinates of the border for keeping the nodes inside a frame
     * https://bl.ocks.org/mbostock/1129492
     */ 
    function nodeTransform(d) {
    	
    	d.x =  Math.max(maxNodeSize, Math.min(w - (d.logowidth/2 || 16/2), d.x));
        d.y =  Math.max(maxNodeSize, Math.min(h - (d.logoheight/2 || 16/2), d.y));
        return "translate(" + d.x + "," + d.y + ")";
    }
    
    /**
     * 
     * @param {Object} d
     */
    function setCircleRadius(d) {
    	
    	if(d.logowidth)
    		radius = d.logowidth/2 + 15;
    	else
    		radius = 16/2 + 15;
    	
    	d.radius = radius;
    	//console.log('d.id=' + d.id + 'radius=' + radius);
    	
    	return d.radius;
    }
</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

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