I get data from database and use jquery tabs to display it:
<script>
$(function () {
   $( "#treeTabs" ).tabs();
});
</script>
<div id="treeTabs">
    <ul>
<?php
$hod_result = getFamilyTree();
$i = 0;
while($hod_row = mysqli_fetch_array($hod_result))
{
?>
    <li>
        <a href="#<?php echo $hod_row["staff_id"]?>" class="tab_header"><span class="closer" data-id3="<?php echo $hod_row["staff_id"] ?>"><i class="fa fa-times" aria-hidden="true"></i></span><?php echo $hod_row["longname"].' ('.$hod_row["team_role"].')' ?></a>              
    </li>
<?php $i++;} ?>
    </ul>
<?php
$hod_result_tabs = getFamilyTree();
$i_tabs = 0;
while($hod_row_tabs = mysqli_fetch_array($hod_result_tabs))
{
?>    
  <div id="<?php echo $hod_row_tabs["staff_id"]?>">
    <div class="tree" id="<?php echo $hod_row_tabs["staff_id"]?>"> 
    <ul>
    <li>
    <?php
    $hod_id_list = $hod_row_tabs["staff_id"];
    $sv_result_list= getSupervisorRole($hod_id_list);
    ?>
    <a href="#">
        <table>
        <tr>
            <th colspan="3">Head Of The Department:</th>    
        </tr>
        <tr>
            <td>
                <?php echo $hod_row_tabs["username"].' '.$hod_row_tabs["staff_id"]; ?>
                <span class="closer" data-id3="<?php echo $hod_row_tabs["staff_id"]; ?>"><i class="fa fa-times" aria-hidden="true"></i></span>
                <a href="#" style="background-color:#808080; color:white; font-size: 8px; padding: 3px 3px 3px 3px;"><?php echo substr($hod_row_tabs["team_role"], 0, 3); ?></a>
                <span class="createTree" data-id3="<?php echo $hod_row_tabs["staff_id"].'|Supervisor';?>"><!--<img alt="" src="imagesAssessment/add.png">--><i class="fa fa-user-plus fa-lg" aria-hidden="true"></i></span>
                <span class="btn_details" data-id3="<?php echo $hod_row_tabs["staff_id"]; ?>"><!--<img title="View Evaluation Details" src="imagesAssessment/details.png">--><i class="fa fa-search fa-lg" aria-hidden="true"></i></span>
            </td>            
        </tr>
        </table>
    </a>
        <?php
        $sv_result= getSupervisorRole($hod_id_list);
        if(mysqli_num_rows($sv_result) > 0){
        ?>        
        <ul>
        <?php
            while($sv_row = mysqli_fetch_array($sv_result))
            {
        ?>
        <!--<ul>-->
            <li>
                <a href="#" >
                    <table style='all:unset;'>
                    <tr>
                        <td>
                            <a href="#" style='all:unset;' class="expand" data-id3="<?php echo $sv_row["staff_id"].'|'.$sv_row["username"].'|'.$sv_row["importance"]; ?>">
                            <?php echo $sv_row["username"]; ?> 
                            </a>
                            <span class="closer" data-id3="<?php echo $sv_row["staff_id"]; ?>"><i class="fa fa-times" aria-hidden="true"></i></span>  
                            <a href="#" style="background-color:#808080; color:white; font-size: 8px; padding: 3px 3px 3px 3px;"><?php echo strtoupper(substr($sv_row["team_role"], 0, 3)); ?></a>              
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <?php echo $sv_row["staff_id"]; ?> 
                            <span class="createTree" data-id3="<?php echo $sv_row["staff_id"].'|Checker'; ?>"><!--<img alt="" src="imagesAssessment/add.png">--><i class="fa fa-user-plus fa-lg" aria-hidden="true"></i></span>
                            <span class="btn_details" data-id3="<?php echo $sv_row["staff_id"]; ?>"><!--<img title="View Evaluation Details" src="imagesAssessment/details.png">--><i class="fa fa-search fa-lg" aria-hidden="true"></i></span>
                        </td>
                    </tr>
                    </table>
                </a>
                <?php                     
                $sv_id=$sv_row["staff_id"];
                $ch_result= getCheckerRole($sv_id); 
                if (mysqli_num_rows($ch_result) > 0){?>
                <ul style='' >
                    <li >
                    <?php
                    while($ch_row = mysqli_fetch_array($ch_result)){ ?>
                <a href="#" style='display: block;'>
                    <table style='all:unset;'>
                    <tr>
                        <td>
                            <a href="#" style='all:unset;' class="expand" data-id3="<?php echo $ch_row["staff_id"].'|'.$ch_row["username"].'|'.$ch_row["importance"]; ?>">
                            <?php echo $ch_row["username"]; ?>                             
                            </a>
                            <span class="closer" data-id3="<?php echo $ch_row["staff_id"]; ?>"><i class="fa fa-times" aria-hidden="true"></i></span>    
                            <a href="#" style="background-color:#808080; color:white; font-size: 8px; padding: 3px 3px 3px 3px;"><?php echo strtoupper(substr($ch_row["team_role"], 0, 3)); ?></a>    
                        </td>
                    </tr>                        
                    <tr>
                        <td>
                            <?php echo $ch_row["staff_id"]; ?>  
                            <span class="createTree" data-id3="<?php echo $ch_row["staff_id"].'|Squad Leader'; ?>"><!--<img alt="" src="imagesAssessment/add.png">--><i class="fa fa-user-plus fa-lg" aria-hidden="true"></i></span>                            
                            <span class="btn_details" data-id3="<?php echo $ch_row["staff_id"]; ?>"><!--<img title="View Evaluation Details" src="imagesAssessment/details.png">--><i class="fa fa-search fa-lg" aria-hidden="true"></i></span>
                        </td>
                    </tr>
                    </table>
                </a>
                    <?php } ?>
                    </li>
                </ul>
                <?php } ?>
            </li>
        <!--</ul>-->
        <?php }} ?>
        </ul>
    </li>
    </ul>
    </div>
    <div class="input"></div>
  </div>
<?php $i_tabs++;} ?>
</div>
Inside each tab i get a tree of names:
 

Then by clicking on  icon there is popup window with list of users:
 icon there is popup window with list of users:

Here is code for dialog window:
var addUserDlg, form;
/*create and open pop up window to create a team*/
addUserDlg = $("#addUserDialog").dialog({
    autoOpen: false,
    height: 650,
    width: 570,
    modal: true,
    position: { my: "center", at: "top" },
    buttons: {
        "Create a tree": addUser,
        Cancel: function () {
            addUserDlg.dialog("close");
        }
    },
    close: function () {
        form[ 0 ].reset();
    }
});
$(document).on('click', '.createTree', function(){
    addUserDlg.dialog("open");
    var leader_role = $(this).data("id3");              
    $.ajax({
        url: "comAssessment/hr_tree_list.php",
        method: "POST",
        data: {leader_role: leader_role},
        success: function (data) {
            $('#users').html(data);
        }
    });
});
 form = addUserDlg.find("form").on("submit", function (event) {
    event.preventDefault();
    addUser();
});
And function addUser:
/*function to add new user to team*/
function addUser() {
    var insert = [];
    if ($('input[name="chk"]:checked').length > 0)
    {
        $('.get_value').each(function () {
            if ($(this).is(":checked"))
            {
                insert.push($(this).val());
            }
        });
        var user_to_leader = $('#user_to_leader').val();
        var team_role = $('#team_role').val();
        insert = insert.toString();
        $.ajax({
            url: "comAssessment/hr_tree_insert.php",
            method: "POST",
            data: {insert: insert, user_to_leader:user_to_leader, team_role:team_role},
            success: function (data) {
                location.reload();
                addUserDlg.dialog("close");
            }
        });
    }
}
Right now I update whole page location.reload(); but it doesnt look nice because it opens first tab every time. How can I update only current tab after adding new users? 
EDIT
Ok, I tried to get index of the tab and refresh it. I added button for testing:
<button id="button">Click me</button>
<div class="test_bt"></div>
And jquery:
$("#button").click(function() {
    var current_index = $("#treeTabs").tabs("option","active");
    $("#treeTabs").tabs('load',current_index);
    $('.test_bt').html(current_index);
});
Then I removed location.reload(); from ajax success function to check if my button will do the work. But it doesnt work. I only get index, no loading happens.
function addUser() {
    var insert = [];
    if ($('input[name="chk"]:checked').length > 0)
    {
        $('.get_value').each(function () {
            if ($(this).is(":checked"))
            {
                insert.push($(this).val());
            }
        });
        var user_to_leader = $('#user_to_leader').val();
        var team_role = $('#team_role').val();
        insert = insert.toString();
        $.ajax({
            url: "comAssessment/hr_tree_insert.php",
            method: "POST",
            data: {insert: insert, user_to_leader:user_to_leader, team_role:team_role},
            success: function (data) {
                addUserDlg.dialog("close");
            }
        });
    }
}
 
     
     
     
    