scrollspy.min.js

!function(e,n){function o(e){return"object"===n.type(e)}function i(e){return"string"===n.type(e)&&n.trim(e).length>0}function t(e,n,o,i){i(e[o])||(e[o]=n[o])}n.fn.extend({scrollspy:function(l,s){if(i(l)){var a=s;s=l,l=a}l=n.extend({},r,l),t(l,r,"container",o);var c=n(l.container);if(0===c.length)return this;if(t(l,r,"namespace",i),i(s)&&"DESTROY"===s.toUpperCase())return c.off("scroll."+l.namespace),this;t(l,r,"buffer",n.isNumeric),t(l,r,"max",n.isNumeric),t(l,r,"min",n.isNumeric),t(l,r,"onEnter",n.isFunction),t(l,r,"onLeave",n.isFunction),t(l,r,"onLeaveTop",n.isFunction),t(l,r,"onLeaveBottom",n.isFunction),t(l,r,"onTick",n.isFunction),n.isFunction(l.max)&&(l.max=l.max()),n.isFunction(l.min)&&(l.min=l.min());var u="VERTICAL"===e.String(l.mode).toUpperCase();return this.each(function(){var e=this,o=n(e),i=0,t=!1,r=0;c.on("scroll."+l.namespace,function(){var s=n(this),a={top:s.scrollTop(),left:s.scrollLeft()},f=c.height(),p=l.max,m=l.min,v=u?a.top+l.buffer:a.left+l.buffer;if(0===p&&(p=u?f:c.outerWidth()+o.outerWidth()),v>=m&&p>=v)t||(t=!0,i++,o.trigger("scrollEnter",{position:a}),null!==l.onEnter&&l.onEnter(e,a)),o.trigger("scrollTick",{position:a,inside:t,enters:i,leaves:r}),null!==l.onTick&&l.onTick(e,a,t,i,r);else if(t)t=!1,r++,o.trigger("scrollLeave",{position:a,leaves:r}),null!==l.onLeave&&l.onLeave(e,a),m>=v?(o.trigger("scrollLeaveTop",{position:a,leaves:r}),null!==l.onLeaveTop&&l.onLeaveTop(e,a)):v>=p&&(o.trigger("scrollLeaveBottom",{position:a,leaves:r}),null!==l.onLeaveBottom&&l.onLeaveBottom(e,a));else{var g=c.scrollTop(),L=o.height(),h=o.offset().top;f+g>h&&h>g-L&&(o.trigger("scrollView",{position:a}),null!==l.onView&&l.onView(e,a))}})})}});var r={buffer:0,container:e,max:0,min:0,mode:"vertical",namespace:"scrollspy",onEnter:null,onLeave:null,onLeaveTop:null,onLeaveBottom:null,onTick:null,onView:null}}(window,window.jQuery);