/**
  * 
  * onAjax action handler
  */
 public static function onAjaxAction()
 {
     $slider = new RevSlider();
     $slide = new RevSlide();
     $operations = new RevOperations();
     $action = self::getPostGetVar("client_action");
     $data = self::getPostGetVar("data");
     try {
         switch ($action) {
             case "export_slider":
                 $sliderID = self::getGetVar("sliderid");
                 $slider->initByID($sliderID);
                 $slider->exportSlider();
                 break;
             case "import_slider":
                 self::importSliderHandle();
                 break;
             case "import_slider_slidersview":
                 $viewBack = self::getViewUrl(self::VIEW_SLIDERS);
                 self::importSliderHandle($viewBack);
                 break;
             case "create_slider":
                 $newSliderID = $slider->createSliderFromOptions($data);
                 self::ajaxResponseSuccessRedirect(__("The slider successfully created", REVSLIDER_TEXTDOMAIN), self::getViewUrl("sliders"));
                 break;
             case "update_slider":
                 $slider->updateSliderFromOptions($data);
                 self::ajaxResponseSuccess(__("Slider updated", REVSLIDER_TEXTDOMAIN));
                 break;
             case "delete_slider":
                 $slider->deleteSliderFromData($data);
                 self::ajaxResponseSuccessRedirect(__("The slider deleted", REVSLIDER_TEXTDOMAIN), self::getViewUrl(self::VIEW_SLIDERS));
                 break;
             case "duplicate_slider":
                 $slider->duplicateSliderFromData($data);
                 self::ajaxResponseSuccessRedirect(__("The duplicate successfully, refreshing page...", REVSLIDER_TEXTDOMAIN), self::getViewUrl(self::VIEW_SLIDERS));
                 break;
             case "add_slide":
                 $numSlides = $slider->createSlideFromData($data);
                 $sliderID = $data["sliderid"];
                 if ($numSlides == 1) {
                     $responseText = __("Slide Created", REVSLIDER_TEXTDOMAIN);
                 } else {
                     $responseText = $numSlides . " " . __("Slides Created", REVSLIDER_TEXTDOMAIN);
                 }
                 $urlRedirect = self::getViewUrl(self::VIEW_SLIDES, "id={$sliderID}");
                 self::ajaxResponseSuccessRedirect($responseText, $urlRedirect);
                 break;
             case "add_slide_fromslideview":
                 $slideID = $slider->createSlideFromData($data, true);
                 $urlRedirect = self::getViewUrl(self::VIEW_SLIDE, "id={$slideID}");
                 $responseText = __("Slide Created, redirecting...", REVSLIDER_TEXTDOMAIN);
                 self::ajaxResponseSuccessRedirect($responseText, $urlRedirect);
                 break;
             case "update_slide":
                 $slide->updateSlideFromData($data);
                 self::ajaxResponseSuccess(__("Slide updated", REVSLIDER_TEXTDOMAIN));
                 break;
             case "delete_slide":
                 $slide->deleteSlideFromData($data);
                 $sliderID = UniteFunctionsRev::getVal($data, "sliderID");
                 self::ajaxResponseSuccessRedirect(__("Slide Deleted Successfully", REVSLIDER_TEXTDOMAIN), self::getViewUrl(self::VIEW_SLIDES, "id={$sliderID}"));
                 break;
             case "duplicate_slide":
                 $sliderID = $slider->duplicateSlideFromData($data);
                 self::ajaxResponseSuccessRedirect(__("Slide Duplicated Successfully", REVSLIDER_TEXTDOMAIN), self::getViewUrl(self::VIEW_SLIDES, "id={$sliderID}"));
                 break;
             case "copy_move_slide":
                 $sliderID = $slider->copyMoveSlideFromData($data);
                 self::ajaxResponseSuccessRedirect(__("The operation successfully, refreshing page...", REVSLIDER_TEXTDOMAIN), self::getViewUrl(self::VIEW_SLIDES, "id={$sliderID}"));
                 break;
             case "get_captions_css":
                 $contentCSS = $operations->getCaptionsContent();
                 self::ajaxResponseData($contentCSS);
                 break;
             case "update_captions_css":
                 $arrCaptions = $operations->updateCaptionsContentData($data);
                 self::ajaxResponseSuccess(__("CSS file saved succesfully!", REVSLIDER_TEXTDOMAIN), array("arrCaptions" => $arrCaptions));
                 break;
             case "restore_captions_css":
                 $operations->restoreCaptionsCss();
                 $contentCSS = $operations->getCaptionsContent();
                 self::ajaxResponseData($contentCSS);
                 break;
             case "update_slides_order":
                 $slider->updateSlidesOrderFromData($data);
                 self::ajaxResponseSuccess(__("Order updated successfully", REVSLIDER_TEXTDOMAIN));
                 break;
             case "change_slide_image":
                 $slide->updateSlideImageFromData($data);
                 $sliderID = UniteFunctionsRev::getVal($data, "slider_id");
                 self::ajaxResponseSuccessRedirect(__("Slide Changed Successfully", REVSLIDER_TEXTDOMAIN), self::getViewUrl(self::VIEW_SLIDES, "id={$sliderID}"));
                 break;
             case "preview_slide":
                 $operations->putSlidePreviewByData($data);
                 break;
             case "preview_slider":
                 $sliderID = UniteFunctionsRev::getPostVariable("sliderid");
                 $operations->previewOutput($sliderID);
                 break;
             case "toggle_slide_state":
                 $currentState = $slide->toggleSlideStatFromData($data);
                 self::ajaxResponseData(array("state" => $currentState));
                 break;
             case "update_slide_lang":
                 $responseData = $slide->updateLangFromData($data);
                 self::ajaxResponseData($responseData);
                 break;
             case "update_plugin":
                 self::updatePlugin(self::DEFAULT_VIEW);
                 break;
             case "update_text":
                 self::updateSettingsText();
                 self::ajaxResponseSuccess("All files successfully updated");
                 break;
             case "update_general_settings":
                 $operations->updateGeneralSettings($data);
                 self::ajaxResponseSuccess(__("General settings updated"));
                 break;
             case "update_lang_filter":
                 $sliderID = $operations->updateLangFilter($data);
                 self::ajaxResponseSuccessRedirect(__("", REVSLIDER_TEXTDOMAIN), self::getViewUrl(self::VIEW_SLIDES, "id={$sliderID}"));
                 break;
             default:
                 self::ajaxResponseError("wrong ajax action: {$action} ");
                 break;
         }
     } catch (Exception $e) {
         $message = $e->getMessage();
         self::ajaxResponseError($message);
     }
     //it's an ajax action, so exit
     self::ajaxResponseError("No response output on <b> {$action} </b> action. please check with the developer.");
     exit;
 }