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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              
            
          
!

CSS

            
              svg{
    /*background:gray;*/
    display: block;
    margin: auto;
}

.node circle{
    fill: #fff;
    stroke: steelblue;
    stroke-width: 3px;
}

.node text{ font: 12px sans-serif; }

.link{
    fill: none;
    stroke: #ccc;
    stroke-width: 2px;
}

.hidden{
    stroke: rgba(0, 0, 0, 0.1);

}
.node.hidden{
        fill: rgba(0, 0, 0, 0.1) !important;
        stroke: rgba(0, 0, 0, 0.1);
}
            
          
!

JS

            
              class Node {
    constructor(value){
        this.value = value;
        this.parent = null;
        this.left = null;
        this.right = null;
    }
}

class BinarySearchTree {
    constructor(node){
        this.root = node;
    }
    
    // Insert Node
    insert(node, root){
        if (node.value == root.value){
            return ;
        }
        else if(node.value < root.value){
            // check if left subtree is null
            if (root.left != null){
                this.insert(node, root.left);  
            }
            else{
                root.left = node;
                node.parent = root;
            }
        } else {
            // check if right subtree is null
            if (root.right != null){
                this.insert(node, root.right); 
            }
            else{
                root.right = node; 
                node.parent = root;
            }
        }    
    }
}

function myXOR(a,b) {
    return ( a || b ) && !( a && b );
}

// Main Program
(function(){
    var numbers = [9,7,8,15];

    var node = new Node(5);
    var tree = new BinarySearchTree(node);

    for (i in numbers){
        tree.insert(new Node(numbers[i]), tree.root);
    }    
    
    // Set dimensions and margins for diagram
    var margin = {top: 40, bottom: 80},
        width = 400,
        height = 400 - margin.top - margin.bottom;

    // append the svg object to the body of the page
    // appends a 'group' element to 'svg'
    // moves the 'group' element to the top left margin   
    var svg = d3.select("body").append("svg")
        // .attr("width", "100%")
        .attr("height", height + margin.top + margin.bottom)
        .attr("viewBox","0 0 400 400")
        .append("g")
        .attr("transform", "translate(0," + margin.top + ")");
                    
    var i = 0,      
        duration = 750,
        root;

    // Declares a tree layout and assigns the size
    var treemap = d3.tree().size([width, height]);

    // Assigns parent, children, height, depth, and coordinates
    root = d3.hierarchy(tree.root, function(d){

        d.children=[];
        if (d.left){
            d.children.push(d.left);
            if (myXOR(d.left, d.right)){
                d.children.push(new Node("e"));
            }
        }
        if (d.right){
            if (myXOR(d.left, d.right)){
                d.children.push(new Node("e"));
            }
            d.children.push(d.right);
        }
        return d.children; 
    });
    
	
    root.x0 = width / 2;
    root.y0 = 0;

    // Collapse after the second level
    // root.children.forEach(collapse);

    update(root);

    // Collapse the node and all it's children
    function collapse(d){
        if(d.children){
            d._children = d.children
            d._children.forEach(collapse)
            d.children = null;
        }
    }

    // Update
    function update(source){
        // Assigns the x and y position for the nodes
        var treeData = treemap(root);
        
        // Compute the new tree layout.
        var nodes = treeData.descendants(),
            links = treeData.descendants().slice(1);
            
        // Normalize for fixed-depth
        nodes.forEach(function(d){ d.y = d.depth*100 });    
        
        // **************** Nodes Section ****************
        
        // 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.x0 + "," + source.y0 + ")";
                         })
                         .on('click', click);
                         
        // Add Circle for the nodes
        nodeEnter.append('circle')
            .attr('class', function(d) {
              if (isNaN(d.value)) {
                return "node hidden";
              }
                return 'node';
            })
            .attr('r', 1e-6)
            .style("fill", function(d){
                return d._children ? "lightsteelblue" : "#fff";
            });
        
        // Add labels for the nodes
        nodeEnter.append('text')
            .attr("dy", ".35em")
            .attr("x", function(d){
                return d.children || d._children ? -13 : 13;
            })
            .attr("text-anchor", function(d){
                return d.children || d._children ? "end" : "start";
            })
            .text(function(d){ return d.data.value; });
        
        // Update
        var nodeUpdate = nodeEnter.merge(node);
        
        // Transition to the proper position for the nodes
        nodeUpdate.transition()
            .duration(duration)
            .attr("transform", function(d) {
                return "translate(" + d.x + "," + d.y + ")";
            });
        
        // Update the node attributes and style
        nodeUpdate.select('circle.node')
            .attr('r', 10)
            .style("fill", function(d){
                return d._children ? "lightsteelblue" : "#fff";
            })
            .attr('cursor', 'pointer');
            
        // Remove any exiting nodes
        nodeExit = node.exit().transition()
            .duration(duration)
            .attr("transform", function(d){
                return "translate(" + source.x +","+ source.y +")";
            })
            .remove();
            
        // On exit reduce the node circles size to 0
        nodeExit.select('circle')
            .attr('r', 1e-6);
        
        // On exit reduce the opacity of text lables  
        nodeExit.select('text')
            .style('fill-opacity', 1e-6)
            
        // **************** Links Section ****************
        
        // Update the links...
        var link = svg.selectAll('path.link')
            .data(links, function(d){ return d.id; });
            
        // Enter any new links at the parent's previous position
        var linkEnter = link.enter().insert('path', "g")
            .attr("class", function(d) {
                if (isNaN(d.value)) {
                    return "link hidden "
                }
                return "link";
            })
            .attr('d', function(d){
                var o = {x: source.x0, y: source.y0};
                return diagonal(o,o);
            });
        
        // Update
        var linkUpdate = linkEnter.merge(link);
        
        // Transition back to the parent element position
        linkUpdate.transition()
            .duration(duration)
            .attr('d', function(d){ return diagonal(d, d.parent) });
        
        // Remove any existing links
            var linkExit = link.exit().transition()
                .duration(duration)
                .attr('d', function(d){
                    var o = {x: source.x, y: source.y};
                })
                .remove();
        
        // Store the old positions for transition.
        nodes.forEach(function(d){
            d.x0 = d.x;
            d.y0 = d.y;
        });
        
        // Create a curved (diagonal) path from parent to the child nodes
        function diagonal(s,d){
            path = `M ${s.x} ${s.y}
            C ${(s.x + d.x) / 2} ${s.y},
              ${(s.x + d.x) / 2} ${d.y},
              ${d.x} ${d.y}`

            return path;
        }

        // 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);
        }
    }
    
})()
            
          
!
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