lubuntu.me/plugins/so-widgets-bundle/base/inc/fields/js/posts-field.min.js

!function(t){t(document).on("sowsetupform",".siteorigin-widget-field-type-posts",function(o){var s=t(this);s.change(function(o){var n=sowbForms.getWidgetFormValues(s),e=n.hasOwnProperty("posts")?n.posts:null,i="";for(var r in e)""!==i&&(i+="&"),i+=r+"="+e[r];t.post(soWidgets.ajaxurl,{action:"sow_get_posts_count",query:i},function(t){s.find(".sow-current-count").text(t.posts_count)})})})}(jQuery);