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16 KiB
JavaScript
1 line
16 KiB
JavaScript
3 years ago
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!function(e,o,n,t){"use strict";o=void 0!==o&&o.Math==Math?o:"undefined"!=typeof self&&self.Math==Math?self:Function("return this")(),e.fn.visibility=function(i){var s,c=e(this),r=c.selector||"",a=(new Date).getTime(),l=[],d=arguments[0],u="string"==typeof d,f=[].slice.call(arguments,1),b=c.length,g=0;return c.each(function(){var c,m,p,v,h=e.isPlainObject(i)?e.extend(!0,{},e.fn.visibility.settings,i):e.extend({},e.fn.visibility.settings),P=h.className,x=h.namespace,C=h.error,y=h.metadata,S="."+x,R="module-"+x,V=e(o),k=e(this),T=e(h.context),O=(k.selector,k.data(R)),z=o.requestAnimationFrame||o.mozRequestAnimationFrame||o.webkitRequestAnimationFrame||o.msRequestAnimationFrame||function(e){setTimeout(e,0)},A=this,w=!1;v={initialize:function(){v.debug("Initializing",h),v.setup.cache(),v.should.trackChanges()&&("image"==h.type&&v.setup.image(),"fixed"==h.type&&v.setup.fixed(),h.observeChanges&&v.observeChanges(),v.bind.events()),v.save.position(),v.is.visible()||v.error(C.visible,k),h.initialCheck&&v.checkVisibility(),v.instantiate()},instantiate:function(){v.debug("Storing instance",v),k.data(R,v),O=v},destroy:function(){v.verbose("Destroying previous module"),p&&p.disconnect(),m&&m.disconnect(),V.off("load"+S,v.event.load).off("resize"+S,v.event.resize),T.off("scroll"+S,v.event.scroll).off("scrollchange"+S,v.event.scrollchange),"fixed"==h.type&&(v.resetFixed(),v.remove.placeholder()),k.off(S).removeData(R)},observeChanges:function(){"MutationObserver"in o&&(m=new MutationObserver(v.event.contextChanged),p=new MutationObserver(v.event.changed),m.observe(n,{childList:!0,subtree:!0}),p.observe(A,{childList:!0,subtree:!0}),v.debug("Setting up mutation observer",p))},bind:{events:function(){v.verbose("Binding visibility events to scroll and resize"),h.refreshOnLoad&&V.on("load"+S,v.event.load),V.on("resize"+S,v.event.resize),T.off("scroll"+S).on("scroll"+S,v.event.scroll).on("scrollchange"+S,v.event.scrollchange)}},event:{changed:function(e){v.verbose("DOM tree modified, updating visibility calculations"),v.timer=setTimeout(function(){v.verbose("DOM tree modified, updating sticky menu"),v.refresh()},100)},contextChanged:function(o){[].forEach.call(o,function(o){o.removedNodes&&[].forEach.call(o.removedNodes,function(o){(o==A||e(o).find(A).length>0)&&(v.debug("Element removed from DOM, tearing down events"),v.destroy())})})},resize:function(){v.debug("Window resized"),h.refreshOnResize&&z(v.refresh)},load:function(){v.debug("Page finished loading"),z(v.refresh)},scroll:function(){h.throttle?(clearTimeout(v.timer),v.timer=setTimeout(function(){T.triggerHandler("scrollchange"+S,[T.scrollTop()])},h.throttle)):z(function(){T.triggerHandler("scrollchange"+S,[T.scrollTop()])})},scrollchange:function(e,o){v.checkVisibility(o)}},precache:function(o,t){o instanceof Array||(o=[o]);for(var i=o.length,s=0,c=[],r=n.createElement("img"),a=function(){++s>=o.length&&e.isFunction(t)&&t()};i--;)(r=n.createElement("img")).onload=a,r.onerror=a,r.src=o[i],c.push(r)},enableCallbacks:function(){v.debug("Allowing callbacks to occur"),w=!1},disableCallbacks:function(){v.debug("Disabling all callbacks temporarily"),w=!0},should:{trackChanges:function(){return u?(v.debug("One time query, no need to bind events"),!1):(v.debug("Callbacks being attached"),!0)}},setup:{cache:function(){v.cache={occurred:{},screen:{},element:{}}},image:function(){var e=k.data(y.src);e&&(v.verbose("Lazy loading image",e),h.once=!0,h.observeChanges=!1,h.onOnScreen=function(){v.debug("Image on screen",A),v.precache(e,function(){v.set.image(e,function(){++g==b&&h.onAllLoaded.call(this),h.onLoad.call(this)})})})},fixed:function(){v.debug("Setting up fixed"),h.once=!1,h.observeChanges=!1,h.initialCheck=!0,h.refreshOnLoad=!0,i.transition||(h.transition=!1),v.create.placeholder(),v.debug("Added placeholder",c),h.onTopPassed=function(){v.debug("Element passed, adding fixed position",k),v.show.placeholder(),v.set.fixed(),h.transition&&e.fn.transition!==t&&k.transition(h.transition,h.duration)},h.onTopPassedReverse=function(){v.debug("Element returned to position, removing fixed",k),v.h
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