D3 Examples - d3.js indented collapsable tree with search

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<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
    <title>indented collapsable tree</title>
    <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@12.10.3/d3.min.js"></script>
    <style type="text/css">
​
.node rect {
  cursor: pointer;
  fill: #fff;
  fill-opacity: .5;
  stroke: #3182bd;
  stroke-width: 1.5px;
}
​
.node text {
  font: 10px sans-serif;
  pointer-events: none;
}
​
path.link {
  fill: none;
  
  stroke: #ff0000;
  stroke-width: 1.5px;
  
​
​
    
    </style>
</head>
<body>
  <div style="overflow:hidden; font-size=11px;">
        <input id="searchField" type="text" name="fname" style="float:left;">
        <input type="button" value="search" onclick="search()" style="float:left; margin-left:5px;">
        <div id="searching" style="float:left; margin-left:20px; margin-top:3px; color:#c9c9b5;width:200px;"></div>
        <div id="clearResult" class="clearResult" onclick="clearResult()">Clear</div>
    
<header>
    
  </header>
    <div id="chart"></div>
​
<script type="text/javascript">
​
var w = 700,
    h = 551000,
    i = 0,
    barHeight = 20,
    barWidth = w * .8,
    duration = 400,
    root;
​
var tree = d3.layout.tree()
    .size([h, 100]);
​
var diagonal = d3.svg.diagonal()
    .projection(function(d) { return [d.y, d.x]; });
​
var vis = d3.select("#chart").append("svg:svg")
    .attr("width", w)
    .attr("height", h)
  .append("svg:g")
    .attr("transform", "translate(20,30)");
  
  var nodes;
        var selected = new Array();
        var selection;
        var scope = new Array();
        var filtered = false;  
    
function moveChildren(node) {
    if(node.children) {
        node.children.forEach(function(c) { moveChildren(c); });
        node._children = node.children;
        node.children = null;
    }
}
    
d3.json("flare.json", function(json) {
  json.x0 = 0;
  json.y0 = 0;
  moveChildren(json);
  update(root = json);
});
​
  function collapse(d, index) {
                d.parent = this;
                d.marker = this.marker + generateMarker(index);
                if (d.children) {
                  d._children = d.children;
                  d._children.forEach(collapse, d);
                  d.children = null;
                }
              }
​
function update(source) {
​
  // Compute the flattened node list. TODO use d3.layout.hierarchy.
  var nodes = tree.nodes(root);
      
  // Compute the "layout".
  nodes.forEach(function(n, i) {
    n.x = i * barHeight;
  });
  
  // Update the nodes…
  var node = vis.selectAll("g.node")
      .data(nodes, function(d) { return d.id || (d.id = ++i); });
  
  var nodeEnter = node.enter().append("svg:g")
      .attr("class", "node")
      .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; })
      .style("opacity", 1e-6);
​
  // Enter any new nodes at the parent's previous position.
  nodeEnter.append("svg:rect")
      .attr("y", -barHeight / 2)
      .attr("height", barHeight)
      .attr("width", barWidth)
      .style("fill", color)
      .on("click", click);
  
  nodeEnter.append("svg:text")
      .attr("dy", 3.5)
      .attr("dx", 5.5)
      .text(function(d) { return d.name; });
  
  // Transition nodes to their new position.
nodeEnter.transition()
      .duration(duration)
      .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; })
      .style("opacity", 1);
  
  node.transition()
      .duration(duration)
      .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; })
      .style("opacity", 1)
    .select("rect")
      .style("fill", color);
  
​
  
  
  // Transition exiting nodes to the parent's new position.
  node.exit().transition()
      .duration(duration)
      .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
      .style("opacity", 1e-6)
      .remove();
  
  // Update the links…
  var link = vis.selectAll("path.link")
      .data(tree.links(nodes), function(d) { return d.target.id; });
  
  // Enter any new links at the parent's previous position.
  link.enter().insert("svg:path", "g")
      .attr("class", "link")
      .attr("d", function(d) {
        var o = {x: source.x0, y: source.y0};
        return diagonal({source: o, target: o});
      })
    .transition()
      .duration(duration)
      .attr("d", diagonal);
  
  // Transition links to their new position.
  link.transition()
      .duration(duration)
      .attr("d", diagonal);
  
  // 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;
  });
}
​
// 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);
}
​
function color(d) {
  return d._children ? "#3182bd" : d.children ? "#c6dbef" : "#fd8d3c";
}
​
function search () {
            var text = document.getElementById('searchField').value.toUpperCase();
            document.getElementById('searching').innerHTML = 'Searching: ' +text;
            
            //reset
            selected = [];
            scope = [];
            selection = '#a';
            vis.selectAll(".nodeText").attr("fill", "black").style("fill-opacity", 0.3);
            vis.selectAll("path").attr("r", 4.5).style("fill", function(d) {
                return d._children ? "lightsteelblue" : "#fff";
            });
            filtered = true;
            
            root.children.forEach(searchChildren, text);
            vis.selectAll(selected).attr("fill", "orange");
            vis.selectAll(scope).style("fill-opacity", 1.0);
            
            document.getElementById('searching').innerHTML = 'Found: ' +selected.length;
        }
        
        function clearResult() {
            filtered = false;
            selected = [];
            scope = [];
            selection = '#a';
            root.children.forEach(clearNodes);
            vis.selectAll(".nodeText").attr("fill", "black");
            vis.selectAll(".nodeText").style("fill-opacity", 1);
            vis.selectAll("path").attr("r", 4.5).style("fill", function(d) {
                return d._children ? "lightsteelblue" : "#fff";
            });
            
            document.getElementById('searching').innerHTML = '';
        }
        
        function clearNodes(d) {
            d.selected = 0;
            if (d.children)
                d.children.forEach(clearNodes);
            else if (d._children)
                d._children.forEach(clearNodes);
        }
        
        function searchChildren(d) {
            d.selected = 0;
            var patt = new RegExp("\\b"+this+"\\b", "i");
            //if (d.name.toUpperCase().indexOf(this) >= 0) {
            if (d.name.match(patt) != null) {
                selected.push('#' + d.marker);
                selection = selection + ', #' + d.marker;
                d.selected = 1;
                addToScope(d);
            }
            
            if (d.children)
                d.children.forEach(searchChildren, this);
            else if (d._children)
                d._children.forEach(searchChildren, this);
        
        }
            
        function addToScope(d) {
            var marker = '#' + d.marker;        
    
            if (scope.indexOf(marker) >= 0) return;
            scope.push(marker);
            if (d.parent == null) return;
            addToScope(d.parent);
        }
        
        function generateMarker(index) {
            if (index > 9)
                return '' + index;
            return '0'+index;
        }
​
    </script>
  </body>
</html>
    