D3 Library test

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<!DOCTYPE html>
<meta charset="UTF-8">
<style>
/* Make the badge float in the top right corner of the button */
.notification {
  background-color: #fa3e3e;
  border-radius: 2px;
  color: white;
 
  padding: 1px 3px;
  font-size: 10px;
  
  position: absolute; /* Position the badge within the relatively positioned button */
  top: 0;
  right: 0;
}

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

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

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

</style>

<body>

<!-- load the d3.js library -->	
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

// Set the dimensions and margins of the diagram
var margin = {top: 20, right: 90, bottom: 30, left: 90},
    width = 960 - margin.left - margin.right,
    height = 500 - 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", width + margin.right + margin.left)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate("
          + margin.left + "," + margin.top + ")");

var i = 0,
    duration = 750,
    root;

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

var treeDataText = {
  "name": "Top Level",
  "children": [
    { 
      "name": "Level 2: A",
      "value": 1,
      "children": 
      [
        {
            "name": "Son of A",
            "value": 3
        },
        { 
            "name": "Daughter of A",
            "value": 5
        },
        { 
            "name": "Another Son of A",
            "value": 55
        }
      ]
    },
    { 
        "name": "Level 2: B",
        "value": 15
    }
  ]
};
var treeData =
  {
    "name": "Top Level",
    "value": 2,
    "type": "black",
    "level": "red",
    "children": [
      {
        "name": "Level 2: A",
        "value": 2,
        "type": "grey",
        "level": "red",
        "children": [
          {
            "name": "Son of A",
            "value": 0,
            "type": "steelblue",
            "level": "orange"
          },
          {
            "name": "Daughter of A",
            "value": 0,
            "type": "steelblue",
            "level": "red"
          }
        ]
      },
      {
        "name": "Level 2: B",
        "value": 0,
        "type": "grey",
        "level": "green"
      }
    ]
  };
// Assigns parent, children, height, depth
root = d3.hierarchy(treeData, function(d) { return d.children; });
root.x0 = height / 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
  }
}

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 * 180});

  // ****************** Nodes section ***************************

  // Update the nodes...
  var node = svg.selectAll('g.node')
      .data(nodes, function(d) {return d.id || (d.id = ++i); });

  // Enter any new modes 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 + ")";
    })
    

  // Add Circle for the nodes
  nodeEnter.append('circle')
      .attr('class', '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.name; });

    // Notification Sign
    nodeEnter.append('circle')
    .style("stroke","orange")
    .style("fill", "orange")
        .attr('class','NotificationSign')
        .attr('cx',10)
        .attr('cy',-10)
        .attr('r',function(d){
            return d._children ? 1e-6 : 0;
        });
        
    nodeEnter.append('text')
    .style("stroke","white")
    .style("fill", "white")
        .attr('class','NotificationSign')
        .attr('x',6)
        .attr('y',-6)
        .text(function(d){
            return d._children ? "+" : "";
        });
    
    // Notification Number    
    nodeEnter.append('circle')
    .style("stroke","#FF0000")
    .style("fill", "#FF0000")
        .attr('class','NotificationText')
        .attr('cx',17.5)
        .attr('cy',-17.5)
        .attr('r',function(d){
            return d._children ? 1e-6 : 0;
        });
        
    nodeEnter.append('text')
    .style("stroke","white")
    .style("fill", "white")
    .style("font-size",8)
        .attr('class','NotificationText')
        .attr('x',13)
        .attr('y',-13)
        .text(function(d){
            return d._children ? d._children.length : "";
        });
        
  // UPDATE
  var nodeUpdate = nodeEnter.merge(node);

  // Transition to the proper position for the node
  nodeUpdate.transition()
    .duration(duration)
    .attr("transform", function(d) { 
        return "translate(" + d.y + "," + d.x + ")";
     });

  // Update the node attributes and style
  nodeUpdate.select('circle.node')
    .attr('r', 10)
    .style("fill", function(d) {
        // if have children goes lightsteelblue else white
        return d._children ? "lightsteelblue" : "#fff";
    })
    .attr('cursor', 'pointer');
    
    nodeUpdate.select('circle.NotificationSign')
    .attr('r',function(d){
            return d._children || d.children ? 8 : 0;
        })
    .attr('cursor', 'pointer')
    .on('click', click);

    nodeUpdate.select('text.NotificationSign')
    .attr('x',6)
    .attr('y',-6)
    .text(function(d){
        if(d._children)
            return "+";
        else if (d.children)
            return "-";
        else
            return "";
        
    })
    .attr('cursor', 'pointer')
    .on('click', click);
    // Notification Number    
    nodeUpdate.select('circle.NotificationText')
    .style("stroke","#FF0000")
    .style("fill", "#FF0000")
        .attr('cx',17.5)
        .attr('cy',-17.5)
        .attr('r',function(d){
            return d._children ? 6 : 0;
        });
        
    nodeUpdate.select('text.NotificationText')
    .style("stroke","white")
    .style("fill", "white")
    .style("font-size",8)
        .attr('x',13)
        .attr('y',-13)
        .text(function(d){
            return d._children ? d._children.length : "";
        });
        
  // Remove any exiting nodes
  var nodeExit = node.exit().transition()
      .duration(duration)
      .attr("transform", function(d) {
          return "translate(" + source.y + "," + source.x + ")";
      })
      .remove();

  // On exit reduce the node circles size to 0
  nodeExit.selectAll('circle')
    .attr('r', function(d)
    {
        if (d.r >0)
            return 1e-6;
        else
            return 0;
    });

  // On exit reduce the opacity of text labels
  nodeExit.selectAll('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", "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 exiting links
  var linkExit = link.exit().transition()
      .duration(duration)
      .attr('d', function(d) {
        var o = {x: source.x, y: source.y}
        return diagonal(o, o)
      })
      .remove();

  // Store the old positions for transition.
  nodes.forEach(function(d){
    d.x0 = d.x;
    d.y0 = d.y;
  });

  // Creates a curved (diagonal) path from parent to the child nodes
  function diagonal(s, d) {

    path = `M ${s.y} ${s.x}
            C ${(s.y + d.y) / 2} ${s.x},
              ${(s.y + d.y) / 2} ${d.x},
              ${d.y} ${d.x}`

    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);
  }
}

</script>
</body>
D3 Library test

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