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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