D3 Examples

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<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */
    
.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 3px;
}
​
  .node rect {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 3px;
}
.node text { font: 10px sans-serif; }
​
.node--internal text {
  text-shadow: 0 1px 0 #fff, 0 -1px 0 #fff, 1px 0 0 #fff, -1px 0 0 #fff;
}
​
.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 2px;
}
​
</style>
​
<body>
​
<!-- load the d3.js library -->     
<script src="//d3js.org/d3.v4.min.js"></script>
<script>
  function textFlow(myText,textToAppend,maxWidth,x,ddy,justified) {
        //extract and add line breaks for start
        var dashArray = new Array();
        var dashFound = true;
        var indexPos = 0;
        var cumulY = 0;
        while (dashFound == true) {
                var result = myText.indexOf("-",indexPos);
                if (result == -1) {
                        //could not find a dash
                        dashFound = false;
                }
                else {
                        dashArray.push(result);
                        indexPos = result + 1;
                }
        }
        //split the text at all spaces and dashes
        var words = myText.split(/[\s-]/);
        var line = "";
        var dy = 0;
        var curNumChars = 0;
        var computedTextLength = 0;
        var myTextNode;
        var tspanEl;
        var lastLineBreak = 0;
        
        for (i=0;i<words.length;i++) {
                var word = words[i];
                curNumChars += word.length + 1;
                if (computedTextLength > maxWidth || i == 0) {
                        if (computedTextLength > maxWidth) {
                             var tempText = tspanEl.firstChild.nodeValue;
                             tempText = tempText.slice(0,(tempText.length - words[i-1].length - 2)); //the -2 is because we also strip off white space
                             tspanEl.firstChild.nodeValue = tempText;
                             if (justified) {
                               //determine the number of words in this line
                               var nrWords = tempText.split(/\s/).length;
                               computedTextLength = tspanEl.getComputedTextLength();
                               var additionalWordSpacing = (maxWidth - computedTextLength) / (nrWords - 1);
                               tspanEl.setAttributeNS(null,"word-spacing",additionalWordSpacing);
                               //alternatively one could use textLength and lengthAdjust, however, currently this is not too well supported in SVG UA's
                             }
                        }
                        tspanEl = document.createElementNS(svgNS,"tspan");
                        tspanEl.setAttributeNS(null,"x",x);
                        tspanEl.setAttributeNS(null,"dy",dy);
                        myTextNode = document.createTextNode(line);
                        tspanEl.appendChild(myTextNode);
                        textToAppend.appendChild(tspanEl);
                        
                        if(checkDashPosition(dashArray,curNumChars-1)) {
                           line = word + "-";
                        }
                        else {
                           line = word + " ";
                        }
                        if (i != 0) {
                           line = words[i-1] + " " + line;
                        }
                        dy = ddy;
                        cumulY += dy;
                 }
                else {
                        if(checkDashPosition(dashArray,curNumChars-1)) {
                                line += word + "-";
                        }
                        else {
                                line += word + " ";
                        }
                }
                tspanEl.firstChild.nodeValue = line;
                computedTextLength = tspanEl.getComputedTextLength();
                if (i == words.length - 1) {
                  if (computedTextLength > maxWidth) {
                    var tempText = tspanEl.firstChild.nodeValue;
                    tspanEl.firstChild.nodeValue = tempText.slice(0,(tempText.length - words[i].length - 1));
                    tspanEl = document.createElementNS(svgNS,"tspan");
                    tspanEl.setAttributeNS(null,"x",x);
                    tspanEl.setAttributeNS(null,"dy",dy);
                    myTextNode = document.createTextNode(words[i]);
                    tspanEl.appendChild(myTextNode);
                    textToAppend.appendChild(tspanEl);
                  }
                
                }
        }
        return cumulY;
}
​
//this function checks if there should be a dash at the given position, instead of a blank
function checkDashPosition(dashArray,pos) {
        var result = false;
        for (var i=0;i<dashArray.length;i++) {
                if (dashArray[i] == pos) {
                        result = true;
                }
        }
        return result;
}
    console.clear();
// the flat data
var flatData = [
  {"name": "Top Level", "parent": null}, 
  {"name": "Level 2: A", "parent": "Top Level" },
  {"name": "Level 2: B", "parent": "Top Level" },
  {"name": "Son of A", "parent": "Level 2: A" },
  {"name": "Daughter of A", "parent": "Level 2: A" }
];
​
    var data = [
      {par: null, id: 'ESTATES' , description: 'Estates Department' , level: 40},
{par: 'ESTATES', id: 'ESTFACMGMT' , description: 'Estates Facilities Management' , level: 50},
{par: 'ESTATES', id: 'ESTCAPPROJ' , description: 'Estates Capital Projects' , level: 50},
{par: 'ESTATES', id: 'ESTPLNPROP' , description: 'Estates Planning and Property' , level: 50},
{par: 'ESTATES', id: 'ESTMAINT' , description: 'Estates Maintenance' , level: 50},
{par: 'ESTATES', id: 'ESTTELADMN' , description: 'Estates Administration and Telecoms' , level: 50},
{par: 'ESTATES', id: 'ESTFINANCE' , description: 'Estates Finance and Corporate Services' , level: 50},
{par: 'ESTATES', id: 'ESTENGSUST' , description: 'Estates Energy and Sustainability' , level: 50},
{par: 'ESTFACMGMT', id: 'ESTSECURIT' , description: 'Estates Campus Security' , level: 60},
{par: 'ESTFACMGMT', id: 'ESTTRANSPO' , description: 'Estates Transport and Car Parking' , level: 60},
{par: 'ESTFACMGMT', id: 'ESTPOST' , description: 'Estates Postal Services' , level: 60},
{par: 'ESTFACMGMT', id: 'ESTCLEAN' , description: 'Estates Cleaning' , level: 60},
{par: 'ESTFACMGMT', id: 'ESTGENERAL' , description: 'Estates General Services' , level: 60},
{par: 'ESTFACMGMT', id: 'ESTINTSERV' , description: 'Estates Interior Services' , level: 60},
{par: 'ESTFACMGMT', id: 'ESTGROUND' , description: 'Estates Grounds' , level: 60},
{par: 'ESTTELADMN', id: 'ESTTELECOM' , description: 'Estates Telecoms' , level: 60},
{par: 'ESTTELADMN', id: 'ESTADMIN' , description: 'Estates Administration' , level: 60},
{par: 'ESTTELADMN', id: 'ESTHLPDESK' , description: 'Estates Helpdesk' , level: 60},
{par: 'ESTFINANCE', id: 'ESTDES&PRI' , description: 'Estates Design and Print Centre' , level: 60}
      
      
      
    ] ;  
  
// convert the flat data into a hierarchy 
var treeData = d3.stratify(data)
  .id(function(d) { return d.id; })
  .parentId(function(d) { return d.par; })
​
  (data);
//console.log(treeData);
// assign the name to each node
treeData.each(function(d) {
    d.name = d.id;
  d.desc = d.data.description;
//  console.log(d.data.description)
  });
​
  
  
// set the dimensions and margins of the diagram
var margin = {top: 20, right: 200, bottom: 30, left: 150},
    width = 800 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
// declares a tree layout and assigns the size
var treemap = d3.tree()
    .size([height, width]);
​
//  assigns the data to a hierarchy using parent-child relationships
var nodes = d3.hierarchy(treeData, function(d) {
    return d.children;
  });
​
// maps the node data to the tree layout
nodes = treemap(nodes);
​
// 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.left + margin.right)
      .attr("height", height + margin.top + margin.bottom),
    g = svg.append("g")
      .attr("transform",
            "translate(" + margin.left + "," + margin.top + ")");
​
// adds the links between the nodes
var link = g.selectAll(".link")
    .data( nodes.descendants().slice(1))
  .enter().append("path")
    .attr("class", "link")
    .attr("d", function(d) {
       return "M" + d.y + "," + d.x
         + "C" + (d.y + d.parent.y) / 2 + "," + d.x
         + " " + (d.y + d.parent.y) / 2 + "," + d.parent.x
         + " " + d.parent.y + "," + d.parent.x;
       });
​
// adds each node as a group
var node = g.selectAll(".node")
    .data(nodes.descendants())
  .enter().append("g")
    .attr("class", function(d) { 
      return "node" + 
        (d.children ? " node--internal" : " node--leaf"); })
    .attr("transform", function(d) { 
      return "translate(" + d.y + "," + d.x + ")"; });
​
// adds the circle to the node
node.append("rect")
.attr("width", 40)
.attr("height", 20);
 // .attr("r", 10);
​
// adds the text to the node
node.append("text")
  .attr("dy", ".35em")
  .attr("x", function(d) { return d.children ? -13 : 13; })
  .style("text-anchor", function(d) { 
    return d.children ? "end" : "start"; })
  .text(function(d) { console.log(d.data.desc);  return d.data.desc; });
    
</script>
</body>
    