javascript - Using fadeIn / fadeOut with Scroll Up For Menu -

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i'm using jquery script "scroll menu" david simpson, (github link) , trying uses fadein , fadeout, when scroll fades out, , when scroll nav fade in. can't seem figure out add it. better add easing event nav div (in case #top) or fadein within script?

js

;(function ( $, window, document, undefined ) {  var pluginname = 'scrollupmenu'; var defaults = {         waittime: 100,         transitiontime: 550,         menucss: { 'position': 'fixed', 'top': '0'},         showdelta: 0 };  var lastscrolltop = 0; var $header; var timer; var pixelsfromthetop;  // actual plugin constructor function plugin ( element, options ) {     this.element = element;     this.settings = $.extend( {}, defaults, options );     this._defaults = defaults;     this._name = pluginname;     this.init(); }  plugin.prototype = {     init: function () {          var self = this;         $header = $(this.element);         $header.css(self.settings.menucss);         pixelsfromthetop = $header.height();          // $header.next().css({ 'margin-top': pixelsfromthetop });          $(window).bind('scroll',function () {             cleartimeout(timer);             timer = settimeout(function() {                 self.refresh(self.settings);             }, self.settings.waittime );         });     },     refresh: function (settings) {         // stopped scrolling, stuff...         var scrolltop = $(window).scrolltop();          var change = lastscrolltop - scrolltop;          if (scrolltop > lastscrolltop && scrolltop > pixelsfromthetop){ // ensure header doesnt disappear             // downscroll             $header.slideup(settings.transitiontime);         } else {             // upscroll             if ( change > settings.showdelta ) {                 $header.slidedown(settings.transitiontime);             }         }         lastscrolltop = scrolltop;     } };  $.fn[ pluginname ] = function ( options ) {     return this.each(function() {             if ( !$.data( this, 'plugin_' + pluginname ) ) {                     $.data( this, 'plugin_' + pluginname, new plugin( this, options ) );             }     }); }; })( jquery, window, document );

html

$(function() {                   $('#top').scrollupmenu({'transitiontime': 100});       });

jsfiddle https://jsfiddle.net/09qxdx43/2/

solved! fadein/fadeout instead of slideup

;(function ( $, window, document, undefined ) {      var pluginname = "scrollupmenu";     var defaults = {             waittime: 20,             transitiontime: 300,             menucss: { 'position': 'fixed', 'top': '0'}     };      var lastscrolltop = 0;                   var $header;     var timer;     var pixelsfromthetop;      // actual plugin constructor     function plugin ( element, options ) {         this.element = element;         this.settings = $.extend( {}, defaults, options );         this._defaults = defaults;         this._name = pluginname;         this.init();     }      plugin.prototype = {         init: function () {              var self = this;             $header = $(this.element);             $header.css(self.settings.menucss);             pixelsfromthetop = $header.height();              $header.next().css({ 'margin-top': pixelsfromthetop });              $(window).bind('scroll',function () {                 cleartimeout(timer);                 timer = settimeout(function() {                     self.refresh(self.settings)                  }, self.settings.waittime );             });         },         refresh: function (settings) {              // stopped scrolling, stuff...                                        var scrolltop = $(window).scrolltop();              if (scrolltop > lastscrolltop && scrolltop > pixelsfromthetop){ // ensure header doesnt disappear                 // downscroll                 $header.fadeout(settings.transitiontime);             } else {                 // upscroll                 $header.fadein(settings.transitiontime);             }             lastscrolltop = scrolltop;         }     };      $.fn[ pluginname ] = function ( options ) {         return this.each(function() {                 if ( !$.data( this, "plugin_" + pluginname ) ) {                         $.data( this, "plugin_" + pluginname, new plugin( this, options ) );                 }         });     };  })( jquery, window, document );

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