Answered by Juvian: http://stackoverflow.com/users/3308055/juvian 

Regarding to the problem of getting children and subchildren of selected, 
you need to deal with recursion: 

Here is an example: http://jsfiddle.net/36gg3ro1/1/

google.visualization.events.addListener(chart, 'select', function(){
          var children=[]
          var selected=chart.getSelection()[0].row;

          function getChilds(index){ // recursive function, adds children of 
index (row)
              var childs=chart.getChildrenIndexes(index); // get children 
indexes of current index
              for(var i = 0; i < childs.length;i++){ // for each children
                  children.push(data.getValue(childs[i],0)) // add the title
                  getChilds(childs[i]) // and call the function with this 
children index, to get their children and so on >> this is recursive
              }
          }

          getChilds(selected) // start recursive function with selected index
          console.log(children)

        })





On Tuesday, 2 December 2014 13:05:33 UTC+2, Mohamed El Ghandour wrote:
>
> Hi,
> I have an organizational chart with many levels, the image below is taken 
> from a part of it.
> I try to get all the childs and sub childs of a selected node, like if 
> "Power Business Unit" node selected it get all the 3 childs and for every 
> single child do the same. I got the first level but I can't get the depth 
> of the tree to provide the number of loops to reach the last child.
>
> 1- How can I get the last child in the chart? how to get the depth of the 
> tree?
> 2- Is there a zoom in/zoom out toolbar or something, that I can add to the 
> chart?
>
> that is my code of drawing:
>
>          google.load('visualization', '1', { packages: ['table', 
> 'orgchart'] });
>         google.setOnLoadCallback(drawChart);
>         function drawChart() {
>
>             var data = new google.visualization.DataTable();
>             data.addColumn('string', 'NODE');
>             data.addColumn('string', 'PARENT');
>             data.addColumn('string', 'NODEID');
>
>             
> data.addRows(JSON.parse(document.getElementById("<%=HiddenField1.ClientID%>").value));
>             //
>             var chart = new 
> google.visualization.OrgChart(document.getElementById('chart_div'));
>
>             function selectHandler() {
>                 var selectedItem = chart.getSelection()[0];
>                 if (selectedItem) {
>                     var oInd = data.getValue(selectedItem.row, 2);
>
>                     var arrLoop = 
> chart.getChildrenIndexes(selectedItem.row);
>                     var arrConcat = 
> chart.getChildrenIndexes(selectedItem.row);
>
>
>                     for (var i = 0; i < arrLoop.length; i++) {
>                         var arr2 = new 
> Array(chart.getChildrenIndexes(arrLoop[i]).length);
>                         arr2 = chart.getChildrenIndexes(arrLoop[i]);
>                         for (var j = 0; j < arr2.length; j++) {
>                             arrConcat.push(arr2[j]);
>                         }
>                         arrConcat.concat(arr2);
>                     }
>
>                     var arrChilds = new Array(arrConcat.length);
>
>                     for (var i = 0; i < arrConcat.length; i++) {
>                         arrChilds[i] = data.getValue(arrConcat[i], 2);
>                     }
>                     drawTable(oInd, arrChilds);
>                 }
>             }
>
>             google.visualization.events.addListener(chart, 'select', 
> selectHandler);
>
>             chart.draw(data, { allowHtml: true });
>
>             //for (var i = 0; i < data.getNumberOfRows() ; i++) {
>             //    chart.collapse(i, true);
>             //}
>         }
>
>
>
>
>
> <https://lh4.googleusercontent.com/-VFmgSBVUuNE/VH2ZgKPiKTI/AAAAAAAAAHI/lk0m4QlzCkw/s1600/OrgChart.JPG>
>

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