how to add new nod in dynamic treeview using javascipt

1var expandedNodes = [];
2var tree = [];
3
4$(function()
5{
6    $.post("http://localhost:8000/getLevel1", function( data ) 
7    {
8        var JSObject = JSON.parse(data);
9
10        for (j in JSObject)
11            tree.push(JSObject[j]);
12
13        createTree();
14    });
15});
16
17function createTree(){
18
19    var options = {
20        bootstrap2: false, 
21        showTags: true,
22        levels: 0,
23        data: tree,
24        expandIcon: 'fa fa-chevron-right',
25        collapseIcon: 'fa fa-chevron-down',
26        onNodeExpanded: nodeExpand,
27        onNodeCollapsed: nodeCollapse,
28        onNodeSelected: nodeSelect,
29        onNodeUnselected: nodeUnselect
30    }
31    $('#treeview').treeview(options);
32    for (node in expandedNodes)
33        $('#treeview').treeview('expandNode', [ expandedNodes[node], { levels: 0, silent: true } ]);
34    $('#treeview').treeview('expandNode', 0, { silent: true } );
35};
36
37
38function nodeExpand(event, data)
39{
40    expandedNodes.push(data.nodeId);
41    var requestObject = []
42    requestObject.push(data.text);
43
44    var parent, dummy = data;
45    while ((parent = $('#treeview').treeview('getParent', dummy.nodeId))["nodeId"] != undefined)
46        {
47        requestObject.push(parent.text);
48        dummy = parent;
49    }
50
51    $.post("http://localhost:8000/getNode?param=" + JSON.stringify(requestObject), function(retVal) 
52    {
53        var JSObject = JSON.parse(retVal);
54        var node = findNode(requestObject);
55        node.nodes = JSObject;
56        createTree();
57    });
58}
59
60function nodeCollapse(event, data)
61{
62    var index = expandedNodes.indexOf(data.nodeId);
63    if (index > -1) 
64        expandedNodes.splice(index, 1);
65}
66
67function nodeSelect(event, data)
68{
69    if (data.state.expanded == true)
70        $('#treeview').treeview('collapseNode', data.nodeId);
71    else
72        $('#treeview').treeview('expandNode', data.nodeId);
73    //$('#treeview').treeview('unselectNode', [ data.nodeId, { silent: true } ]);
74}
75
76function nodeUnselect(event, data)
77{
78}
79
80function findNode(array)
81{
82    var searchIn = tree; //array
83    var lastFound = tree;
84    for (var i = array.length - 1; i >= 0; i--)
85        {
86        var obj = searchInObject(searchIn, array[i]);
87        searchIn = obj.nodes;
88        lastFound = obj;
89    }
90
91    return lastFound;
92}
93
94function searchInObject(objectArray, string)
95{
96    for (var index in objectArray)
97        if (objectArray[index].text == string)
98            return objectArray[index];
99}
100
101$(document).ready(function () {
102    var trigger = $('.hamburger'),
103    overlay = $('.overlay'),
104    isClosed = false;
105    hamburger_cross();
106    $('#wrapper').toggleClass('toggled');
107
108    trigger.click(function () {
109        hamburger_cross();      
110    });
111
112    function hamburger_cross() {
113
114        if (isClosed == true) {          
115            overlay.hide();
116            trigger.removeClass('is-open');
117            trigger.addClass('is-closed');
118            isClosed = false;
119            $('#open_arrow').removeClass('fa-chevron-circle-left').addClass('fa-chevron-circle-right');
120        } else {   
121            overlay.show();
122            trigger.removeClass('is-closed');
123            trigger.addClass('is-open');
124            isClosed = true;
125            $('#open_arrow').removeClass('fa-chevron-circle-right').addClass('fa-chevron-circle-left');
126        }
127    }
128
129    $('[data-toggle="offcanvas"]').click(function () {
130        $('#wrapper').toggleClass('toggled');
131
132    });  
133});
134