whmcsDNSManager/modules/addons/DNSManager2/templates/clientarea/default/pages/dashboard/modal/add-rdns.tpl

<div class="modal" tabindex="-1" role="dialog" aria-labelledby="" aria-hidden="true">
    <div class="modal-dialog">
        <div class="modal-content">
            <form class="form-horizontal" action="" method="post">
                <div class="modal-header"><button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
                    <h4 class="modal-title">{$MGLANG->T('add_new_rdns')}</h4>
                </div>
                <div class="modal-body">
                    <div class="form-group">
                        <label class="col-sm-3 control-label">{$MGLANG->T('related_item')}</label>
                        <div class="col-sm-7">
                            <select name="item" class="select2">
                                <option value="">{$MGLANG->T('select_one')}</option>
                                {foreach from=$items item="item"}
                                    <option value="{$item.type}::{$item.relid}" data-act="getRDNSData" data-query="type={$item.type}&relid={$item.relid}" data-do-not-close-the-modal="" data-no-validate="1">{$item.name}</option>
                                {/foreach}
                            </select>
                        </div>
                    </div>
                    <div id="rdns-data">
                        
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default" data-dismiss="modal">{$MGLANG->T('cancel')}</button>
                    <button type="button" class="btn btn-success" data-act="addRDNSSave">{$MGLANG->T('add')}</button>                                  
                </div>
            </form>
        </div>
    </div>
</div>

{literal}
    <script data-cfasync="false" type="text/javascript">   
        function getRDNSDataCallback(data, $obj) {
            jQuery('#rdns-data').html(data.html);
            $obj.parent().find('option[value=""]').remove();
        }
        
        (function($) {
            $(document).delegate('[name=ip]','change', function() {
                $(this).parents('form').first().find('.block-ip').removeClass('has-error').toggle(typeof $('option:selected', this).data('pool') != 'undefined');
            });
        })(jQuery);
        
    </script>
{/literal}