How to update jstree node values without reload

for deleting the node and reload tree

 $('#mytree').jstree(true).refresh();

for those who need to redraw without restart the tree use

jQuery('#data').jstree(true).refresh(true);

What you need is not refresh() but redraw() thus the code is

$('#mytree').jstree(true).settings.core.data = new_data;
$('#mytree').jstree(true).redraw(true);

You can find the functions in the jstree API.

As per zmirc suggestion, in v3.1 use:

$('#mytree').jstree(true).settings.core.data = new_data;
$('#mytree').jstree(true).refresh();

worked for me: $('#structureRows').jstree("destroy").empty();

function CreateStructureTree(jsonData)
        {
            $('#structureRows').jstree("destroy").empty(); 
            $('#structureRows').jstree
                ({
                    'core' : {
                        'data':
                            [

                                jsonData,
                                {
                                'id' : 'node_2',
                                'text' : 'Root node with options',
                                'state' : { 'opened' : true, 'selected' : true },
                                'children' : [ { 'text' : 'Child 1' }, 'Child 2']
                                }
                            ]

                     }
                });

            }