https://app.myteachlink.com/Scripts/loader/jquery.preloader.min.js

1!function(e,t,n,i){function o(t,n){this.element=t,this.options=e.extend({},d,n),this._defaults=d,this._name=p,this.init()}var r,s,a,l,p="preloader",d={text:"",percent:"",duration:"",zIndex:"",setRelative:!1},c='<span class="preloader-text"></span>',h='<span class="preloader-percent"></span>',u=!1,f={remove:function(){r&&(u=!1,r.remove())},update:function(e){var t=e[1];if(t.percent.length>0&&l)l.text(t.percent+"%");else if(!l)return console.warn("Значение не может быть обновлено"),!1;if(t.text.length>0&&a)a.text(t.text);else if(!a)return console.warn("Значение не может быть обновлено"),!1}};o.prototype.init=function(){function t(){var e,t=f.scrollTop(),n=$preloaderContainer.height();e=Math.round(i/2-n/2+t)+"px",$preloaderContainer.css({top:e})}var n,i,o,d,f=e(this.element);return u?(console.warn("Plugin "+p+" is already initialized"),!1):(f.prepend('<div class="preloader"><div class="preloader-container"><div class="preloader-animation"></div></div></div>'),r=f.find(".preloader"),$preloaderContainer=f.find(".preloader-container"),s=r.find(".preloader-animation"),i=f.height(),o=f[0].scrollHeight,d=r.height(),o>d&&(r.height(o),f.on("scroll",t).trigger("scroll")),this.options.text.length>0&&($preloaderContainer.prepend(c),a=f.find(".preloader-text"),a.text(this.options.text)),this.options.percent.length>0&&(n=this.options.percent,n<0?n=0:n>100&&(n=100),$preloaderContainer.prepend(h),l=f.find(".preloader-percent"),l.text(n+"%")),this.options.duration.length>0&&setTimeout(function(){r.remove()},this.options.duration),this.options.zIndex.length>0&&r.css("z-index",this.options.zIndex),1==this.options.setRelative&&f.css("position","relative"),void(u=!0))},e.fn[p]=function(t,n){var i=arguments[0],r=Array.prototype.slice.call(arguments);return f[i]?this.each(function(){f[i].call(this,r)}):"object"!=typeof i&&i?void e.error("Method "+i+" does not exist on jQuery."+p):this.each(function(){e.data(this,"plugin_"+p)||e.data(this,"plugin_"+p),new o(this,i)})}}(jQuery,window,document);