vue-lazyload.js

/*!
 * Vue-Lazyload.js v1.3.0
 * (c) 2019 Awe <hilongjw@gmail.com>
 * Released under the MIT License.
 */
!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):t.VueLazyload=e()}(this,function(){"use strict";function t(t){return t.constructor&&"function"==typeof t.constructor.isBuffer&&t.constructor.isBuffer(t)}function e(t){t=t||{};var e=arguments.length,i=0;if(1===e)return t;for(;++i<e;){var o=arguments[i];g(t)&&(t=o),r(o)&&n(t,o)}return t}function n(t,n){m(t,n);for(var o in n)if("__proto__"!==o&&i(n,o)){var s=n[o];r(s)?("undefined"===L(t[o])&&"function"===L(s)&&(t[o]=s),t[o]=e(t[o]||{},s)):t[o]=s}return t}function r(t){return"object"===L(t)||"function"===L(t)}function i(t,e){return Object.prototype.hasOwnProperty.call(t,e)}function o(t,e){if(t.length){var n=t.indexOf(e);return n>-1?t.splice(n,1):void 0}}function s(t,e){for(var n=!1,r=0,i=t.length;r<i;r++)if(e(t[r])){n=!0;break}return n}function a(t,e){if("IMG"===t.tagName&&t.getAttribute("data-srcset")){var n=t.getAttribute("data-srcset"),r=[],i=t.parentNode,o=i.offsetWidth*e,s=void 0,a=void 0,u=void 0;n=n.trim().split(","),n.map(function(t){t=t.trim(),s=t.lastIndexOf(" "),-1===s?(a=t,u=999998):(a=t.substr(0,s),u=parseInt(t.substr(s+1,t.length-s-2),10)),r.push([u,a])}),r.sort(function(t,e){if(t[0]<e[0])return 1;if(t[0]>e[0])return-1;if(t[0]===e[0]){if(-1!==e[1].indexOf(".webp",e[1].length-5))return 1;if(-1!==t[1].indexOf(".webp",t[1].length-5))return-1}return 0});for(var d="",l=void 0,c=0;c<r.length;c++){l=r[c],d=l[1];var h=r[c+1];if(h&&h[0]<o){d=l[1];break}if(!h){d=l[1];break}}return d}}function u(t,e){for(var n=void 0,r=0,i=t.length;r<i;r++)if(e(t[r])){n=t[r];break}return n}function d(){if(!_)return!1;var t=!0,e=document;try{var n=e.createElement("object");n.type="image/webp",n.style.visibility="hidden",n.innerHTML="!",e.body.appendChild(n),t=!n.offsetWidth,e.body.removeChild(n)}catch(e){t=!1}return t}function l(t,e){var n=null,r=0;return function(){if(!n){var i=Date.now()-r,o=this,s=arguments,a=function(){r=Date.now(),n=!1,t.apply(o,s)};i>=e?a():n=setTimeout(a,e)}}}function c(t){return null!==t&&"object"===(void 0===t?"undefined":p(t))}function h(t){if(!(t instanceof Object))return[];if(Object.keys)return Object.keys(t);var e=[];for(var n in t)t.hasOwnProperty(n)&&e.push(n);return e}function f(t){for(var e=t.length,n=[],r=0;r<e;r++)n.push(t[r]);return n}function v(){}var p="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof Symbol&&t.constructor===Symbol&&t!==Symbol.prototype?"symbol":typeof t},b=function(t,e){if(!(t instanceof e))throw new TypeError("Cannot call a class as a function")},y=function(){function t(t,e){for(var n=0;n<e.length;n++){var r=e[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(t,r.key,r)}}return function(e,n,r){return n&&t(e.prototype,n),r&&t(e,r),e}}(),g=function(t){return null==t||"function"!=typeof t&&"object"!==(void 0===t?"undefined":p(t))},m=function(t,e){if(null===t||void 0===t)throw new TypeError("expected first argument to be an object.");if(void 0===e||"undefined"==typeof Symbol)return t;if("function"!=typeof Object.getOwnPropertySymbols)return t;for(var n=Object.prototype.propertyIsEnumerable,r=Object(t),i=arguments.length,o=0;++o<i;)for(var s=Object(arguments[o]),a=Object.getOwnPropertySymbols(s),u=0;u<a.length;u++){var d=a[u];n.call(s,d)&&(r[d]=s[d])}return r},w=Object.prototype.toString,L=function(e){var n=void 0===e?"undefined":p(e);return"undefined"===n?"undefined":null===e?"null":!0===e||!1===e||e instanceof Boolean?"boolean":"string"===n||e instanceof String?"string":"number"===n||e instanceof Number?"number":"function"===n||e instanceof Function?void 0!==e.constructor.name&&"Generator"===e.constructor.name.slice(0,9)?"generatorfunction":"function":void 0!==Array.isArray&&Array.isArray(e)?"array":e instanceof RegExp?"regexp":e instanceof Date?"date":(n=w.call(e),"[object RegExp]"===n?"regexp":"[object Date]"===n?"date":"[object Arguments]"===n?"arguments":"[object Error]"===n?"error":"[object Promise]"===n?"promise":t(e)?"buffer":"[object Set]"===n?"set":"[object WeakSet]"===n?"weakset":"[object Map]"===n?"map":"[object WeakMap]"===n?"weakmap":"[object Symbol]"===n?"symbol":"[object Map Iterator]"===n?"mapiterator":"[object Set Iterator]"===n?"setiterator":"[object String Iterator]"===n?"stringiterator":"[object Array Iterator]"===n?"arrayiterator":"[object Int8Array]"===n?"int8array":"[object Uint8Array]"===n?"uint8array":"[object Uint8ClampedArray]"===n?"uint8clampedarray":"[object Int16Array]"===n?"int16array":"[object Uint16Array]"===n?"uint16array":"[object Int32Array]"===n?"int32array":"[object Uint32Array]"===n?"uint32array":"[object Float32Array]"===n?"float32array":"[object Float64Array]"===n?"float64array":"object")},E=e,_="undefined"!=typeof window,k=function(){return!!(_&&"IntersectionObserver"in window&&"IntersectionObserverEntry"in window&&"intersectionRatio"in window.IntersectionObserverEntry.prototype)&&("isIntersecting"in window.IntersectionObserverEntry.prototype||Object.defineProperty(window.IntersectionObserverEntry.prototype,"isIntersecting",{get:function(){return this.intersectionRatio>0}}),!0)}(),A={event:"event",observer:"observer"},j=function(){function t(t,e){e=e||{bubbles:!1,cancelable:!1,detail:void 0};var n=document.createEvent("CustomEvent");return n.initCustomEvent(t,e.bubbles,e.cancelable,e.detail),n}if(_)return"function"==typeof window.CustomEvent?window.CustomEvent:(t.prototype=window.Event.prototype,t)}(),z=function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:1;return _?window.devicePixelRatio||t:t},I=function(){if(_){var t=!1;try{var e=Object.defineProperty({},"passive",{get:function(){t=!0}});window.addEventListener("test",null,e)}catch(t){}return t}}(),O={on:function(t,e,n){var r=arguments.length>3&&void 0!==arguments[3]&&arguments[3];I?t.addEventListener(e,n,{capture:r,passive:!0}):t.addEventListener(e,n,r)},off:function(t,e,n){var r=arguments.length>3&&void 0!==arguments[3]&&arguments[3];t.removeEventListener(e,n,r)}},T=function(t,e,n){var r=new Image;r.src=t.src,r.onload=function(){e({naturalHeight:r.naturalHeight,naturalWidth:r.naturalWidth,src:r.src})},r.onerror=function(t){n(t)}},S=function(t,e){return"undefined"!=typeof getComputedStyle?getComputedStyle(t,null).getPropertyValue(e):t.style[e]},$=function(t){return S(t,"overflow")+S(t,"overflow-y")+S(t,"overflow-x")},x=function(t){if(_){if(!(t instanceof HTMLElement))return window;for(var e=t;e&&e!==document.body&&e!==document.documentElement&&e.parentNode;){if(/(scroll|auto)/.test($(e)))return e;e=e.parentNode}return window}},H={},Q=function(){function t(e){var n=e.el,r=e.src,i=e.error,o=e.loading,s=e.bindType,a=e.$parent,u=e.options,d=e.elRenderer;b(this,t),this.el=n,this.src=r,this.error=i,this.loading=o,this.bindType=s,this.attempt=0,this.naturalHeight=0,this.naturalWidth=0,this.options=u,this.rect=null,this.$parent=a,this.elRenderer=d,this.performanceData={init:Date.now(),loadStart:0,loadEnd:0},this.filter(),this.initState(),this.render("loading",!1)}return y(t,[{key:"initState",value:function(){"dataset"in this.el?this.el.dataset.src=this.src:this.el.setAttribute("data-src",this.src),this.state={error:!1,loaded:!1,rendered:!1}}},{key:"record",value:function(t){this.performanceData[t]=Date.now()}},{key:"update",value:function(t){var e=t.src,n=t.loading,r=t.error,i=this.src;this.src=e,this.loading=n,this.error=r,this.filter(),i!==this.src&&(this.attempt=0,this.initState())}},{key:"getRect",value:function(){this.rect=this.el.getBoundingClientRect()}},{key:"checkInView",value:function(){return this.getRect(),0<this.rect.top&&this.rect.top<window.innerHeight*this.options.preLoad||0<this.rect.bottom&&this.rect.bottom<window.innerHeight*this.options.preLoad||0<this.rect.left&&this.rect.left<window.innerWidth*this.options.preLoad||0<this.rect.right&&this.rect.right<window.innerWidth*this.options.preLoad}},{key:"filter",value:function(){var t=this;h(this.options.filter).map(function(e){t.options.filter[e](t,t.options)})}},{key:"renderLoading",value:function(t){var e=this;T({src:this.loading},function(n){e.render("loading",!1),t()},function(){t(),e.options.silent||console.warn("VueLazyload log: load failed with loading image("+e.loading+")")})}},{key:"load",value:function(){var t=this,e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:v;return this.attempt>this.options.attempt-1&&this.state.error?(this.options.silent||console.log("VueLazyload log: "+this.src+" tried too more than "+this.options.attempt+" times"),void e()):this.state.loaded||H[this.src]?(this.state.loaded=!0,e(),this.render("loaded",!0)):void this.renderLoading(function(){t.attempt++,t.options.adapter.beforeLoad&&t.options.adapter.beforeLoad(t,t.options),t.record("loadStart"),T({src:t.src},function(n){t.naturalHeight=n.naturalHeight,t.naturalWidth=n.naturalWidth,t.state.loaded=!0,t.state.error=!1,t.record("loadEnd"),t.render("loaded",!1),H[t.src]=1,e()},function(e){!t.options.silent&&console.error(e),t.state.error=!0,t.state.loaded=!1,t.render("error",!1)})})}},{key:"render",value:function(t,e){this.elRenderer(this,t,e)}},{key:"performance",value:function(){var t="loading",e=0;return this.state.loaded&&(t="loaded",e=(this.performanceData.loadEnd-this.performanceData.loadStart)/1e3),this.state.error&&(t="error"),{src:this.src,state:t,time:e}}},{key:"destroy",value:function(){this.el=null,this.src=null,this.error=null,this.loading=null,this.bindType=null,this.attempt=0}}]),t}(),R="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7",C=["scroll","wheel","mousewheel","resize","animationend","transitionend","touchmove"],W={rootMargin:"0px",threshold:0},B=function(t){return function(){function e(t){var n=t.preLoad,r=t.error,i=t.throttleWait,o=t.preLoadTop,s=t.dispatchEvent,a=t.loading,u=t.attempt,c=t.silent,h=void 0===c||c,f=t.scale,v=t.listenEvents,p=(t.hasbind,t.filter),y=t.adapter,g=t.observer,m=t.observerOptions;b(this,e),this.version="1.3.0",this.mode=A.event,this.ListenerQueue=[],this.TargetIndex=0,this.TargetQueue=[],this.options={silent:h,dispatchEvent:!!s,throttleWait:i||200,preLoad:n||1.3,preLoadTop:o||0,error:r||R,loading:a||R,attempt:u||3,scale:f||z(f),ListenEvents:v||C,hasbind:!1,supportWebp:d(),filter:p||{},adapter:y||{},observer:!!g,observerOptions:m||W},this._initEvent(),this.lazyLoadHandler=l(this._lazyLoadHandler.bind(this),this.options.throttleWait),this.setMode(this.options.observer?A.observer:A.event)}return y(e,[{key:"config",value:function(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{};E(this.options,t)}},{key:"performance",value:function(){var t=[];return this.ListenerQueue.map(function(e){t.push(e.performance())}),t}},{key:"addLazyBox",value:function(t){this.ListenerQueue.push(t),_&&(this._addListenerTarget(window),this._observer&&this._observer.observe(t.el),t.$el&&t.$el.parentNode&&this._addListenerTarget(t.$el.parentNode))}},{key:"add",value:function(e,n,r){var i=this;if(s(this.ListenerQueue,function(t){return t.el===e}))return this.update(e,n),t.nextTick(this.lazyLoadHandler);var o=this._valueFormatter(n.value),u=o.src,d=o.loading,l=o.error;t.nextTick(function(){u=a(e,i.options.scale)||u,i._observer&&i._observer.observe(e);var o=Object.keys(n.modifiers)[0],s=void 0;o&&(s=r.context.$refs[o],s=s?s.$el||s:document.getElementById(o)),s||(s=x(e));var c=new Q({bindType:n.arg,$parent:s,el:e,loading:d,error:l,src:u,elRenderer:i._elRenderer.bind(i),options:i.options});i.ListenerQueue.push(c),_&&(i._addListenerTarget(window),i._addListenerTarget(s)),i.lazyLoadHandler(),t.nextTick(function(){return i.lazyLoadHandler()})})}},{key:"update",value:function(e,n,r){var i=this,o=this._valueFormatter(n.value),s=o.src,d=o.loading,l=o.error;s=a(e,this.options.scale)||s;var c=u(this.ListenerQueue,function(t){return t.el===e});c?c.update({src:s,loading:d,error:l}):this.add(e,n,r),this._observer&&(this._observer.unobserve(e),this._observer.observe(e)),this.lazyLoadHandler(),t.nextTick(function(){return i.lazyLoadHandler()})}},{key:"remove",value:function(t){if(t){this._observer&&this._observer.unobserve(t);var e=u(this.ListenerQueue,function(e){return e.el===t});e&&(this._removeListenerTarget(e.$parent),this._removeListenerTarget(window),o(this.ListenerQueue,e)&&e.destroy())}}},{key:"removeComponent",value:function(t){t&&(o(this.ListenerQueue,t),this._observer&&this._observer.unobserve(t.el),t.$parent&&t.$el.parentNode&&this._removeListenerTarget(t.$el.parentNode),this._removeListenerTarget(window))}},{key:"setMode",value:function(t){var e=this;k||t!==A.observer||(t=A.event),this.mode=t,t===A.event?(this._observer&&(this.ListenerQueue.forEach(function(t){e._observer.unobserve(t.el)}),this._observer=null),this.TargetQueue.forEach(function(t){e._initListen(t.el,!0)})):(this.TargetQueue.forEach(function(t){e._initListen(t.el,!1)}),this._initIntersectionObserver())}},{key:"_addListenerTarget",value:function(t){if(t){var e=u(this.TargetQueue,function(e){return e.el===t});return e?e.childrenCount++:(e={el:t,id:++this.TargetIndex,childrenCount:1,listened:!0},this.mode===A.event&&this._initListen(e.el,!0),this.TargetQueue.push(e)),this.TargetIndex}}},{key:"_removeListenerTarget",value:function(t){var e=this;this.TargetQueue.forEach(function(n,r){n.el===t&&(--n.childrenCount||(e._initListen(n.el,!1),e.TargetQueue.splice(r,1),n=null))})}},{key:"_initListen",value:function(t,e){var n=this;this.options.ListenEvents.forEach(function(r){return O[e?"on":"off"](t,r,n.lazyLoadHandler)})}},{key:"_initEvent",value:function(){var t=this;this.Event={listeners:{loading:[],loaded:[],error:[]}},this.$on=function(e,n){t.Event.listeners[e]||(t.Event.listeners[e]=[]),t.Event.listeners[e].push(n)},this.$once=function(e,n){function r(){i.$off(e,r),n.apply(i,arguments)}var i=t;t.$on(e,r)},this.$off=function(e,n){if(!n){if(!t.Event.listeners[e])return;return void(t.Event.listeners[e].length=0)}o(t.Event.listeners[e],n)},this.$emit=function(e,n,r){t.Event.listeners[e]&&t.Event.listeners[e].forEach(function(t){return t(n,r)})}}},{key:"_lazyLoadHandler",value:function(){var t=this,e=[];this.ListenerQueue.forEach(function(t,n){if(!t.state.error&&t.state.loaded)return e.push(t);t.checkInView()&&t.load()}),e.forEach(function(e){return o(t.ListenerQueue,e)})}},{key:"_initIntersectionObserver",value:function(){var t=this;k&&(this._observer=new IntersectionObserver(this._observerHandler.bind(this),this.options.observerOptions),this.ListenerQueue.length&&this.ListenerQueue.forEach(function(e){t._observer.observe(e.el)}))}},{key:"_observerHandler",value:function(t,e){var n=this;t.forEach(function(t){t.isIntersecting&&n.ListenerQueue.forEach(function(e){if(e.el===t.target){if(e.state.loaded)return n._observer.unobserve(e.el);e.load()}})})}},{key:"_elRenderer",value:function(t,e,n){if(t.el){var r=t.el,i=t.bindType,o=void 0;switch(e){case"loading":o=t.loading;break;case"error":o=t.error;break;default:o=t.src}if(i?r.style[i]='url("'+o+'")':r.getAttribute("src")!==o&&r.setAttribute("src",o),r.setAttribute("lazy",e),this.$emit(e,t,n),this.options.adapter[e]&&this.options.adapter[e](t,this.options),this.options.dispatchEvent){var s=new j(e,{detail:t});r.dispatchEvent(s)}}}},{key:"_valueFormatter",value:function(t){var e=t,n=this.options.loading,r=this.options.error;return c(t)&&(t.src||this.options.silent||console.error("Vue Lazyload warning: miss src with "+t),e=t.src,n=t.loading||this.options.loading,r=t.error||this.options.error),{src:e,loading:n,error:r}}}]),e}()},D=function(t){return{props:{tag:{type:String,default:"div"}},render:function(t){return!1===this.show?t(this.tag):t(this.tag,null,this.$slots.default)},data:function(){return{el:null,state:{loaded:!1},rect:{},show:!1}},mounted:function(){this.el=this.$el,t.addLazyBox(this),t.lazyLoadHandler()},beforeDestroy:function(){t.removeComponent(this)},methods:{getRect:function(){this.rect=this.$el.getBoundingClientRect()},checkInView:function(){return this.getRect(),_&&this.rect.top<window.innerHeight*t.options.preLoad&&this.rect.bottom>0&&this.rect.left<window.innerWidth*t.options.preLoad&&this.rect.right>0},load:function(){this.show=!0,this.state.loaded=!0,this.$emit("show",this)}}}},V=function(){function t(e){var n=e.lazy;b(this,t),this.lazy=n,n.lazyContainerMananger=this,this._queue=[]}return y(t,[{key:"bind",value:function(t,e,n){var r=new M({el:t,binding:e,vnode:n,lazy:this.lazy});this._queue.push(r)}},{key:"update",value:function(t,e,n){var r=u(this._queue,function(e){return e.el===t});r&&r.update({el:t,binding:e,vnode:n})}},{key:"unbind",value:function(t,e,n){var r=u(this._queue,function(e){return e.el===t});r&&(r.clear(),o(this._queue,r))}}]),t}(),P={selector:"img"},M=function(){function t(e){var n=e.el,r=e.binding,i=e.vnode,o=e.lazy;b(this,t),this.el=null,this.vnode=i,this.binding=r,this.options={},this.lazy=o,this._queue=[],this.update({el:n,binding:r})}return y(t,[{key:"update",value:function(t){var e=this,n=t.el,r=t.binding;this.el=n,this.options=E({},P,r.value),this.getImgs().forEach(function(t){e.lazy.add(t,E({},e.binding,{value:{src:"dataset"in t?t.dataset.src:t.getAttribute("data-src"),error:("dataset"in t?t.dataset.error:t.getAttribute("data-error"))||e.options.error,loading:("dataset"in t?t.dataset.loading:t.getAttribute("data-loading"))||e.options.loading}}),e.vnode)})}},{key:"getImgs",value:function(){return f(this.el.querySelectorAll(this.options.selector))}},{key:"clear",value:function(){var t=this;this.getImgs().forEach(function(e){return t.lazy.remove(e)}),this.vnode=null,this.binding=null,this.lazy=null}}]),t}(),N=function(t){return{props:{src:[String,Object],tag:{type:String,default:"img"}},render:function(t){return t(this.tag,{attrs:{src:this.renderSrc}},this.$slots.default)},data:function(){return{el:null,options:{src:"",error:"",loading:"",attempt:t.options.attempt},state:{loaded:!1,error:!1,attempt:0},rect:{},renderSrc:""}},watch:{src:function(){this.init(),t.addLazyBox(this),t.lazyLoadHandler()}},created:function(){this.init(),this.renderSrc=this.options.loading},mounted:function(){this.el=this.$el,t.addLazyBox(this),t.lazyLoadHandler()},beforeDestroy:function(){t.removeComponent(this)},methods:{init:function(){var e=t._valueFormatter(this.src),n=e.src,r=e.loading,i=e.error;this.state.loaded=!1,this.options.src=n,this.options.error=i,this.options.loading=r,this.renderSrc=this.options.loading},getRect:function(){this.rect=this.$el.getBoundingClientRect()},checkInView:function(){return this.getRect(),_&&this.rect.top<window.innerHeight*t.options.preLoad&&this.rect.bottom>0&&this.rect.left<window.innerWidth*t.options.preLoad&&this.rect.right>0},load:function(){var e=this,n=arguments.length>0&&void 0!==arguments[0]?arguments[0]:v;if(this.state.attempt>this.options.attempt-1&&this.state.error)return t.options.silent||console.log("VueLazyload log: "+this.options.src+" tried too more than "+this.options.attempt+" times"),void n();var r=this.options.src;T({src:r},function(t){var n=t.src;e.renderSrc=n,e.state.loaded=!0},function(t){e.state.attempt++,e.renderSrc=e.options.error,e.state.error=!0})}}}};return{install:function(t){var e=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},n=B(t),r=new n(e),i=new V({lazy:r}),o="2"===t.version.split(".")[0];t.prototype.$Lazyload=r,e.lazyComponent&&t.component("lazy-component",D(r)),e.lazyImage&&t.component("lazy-image",N(r)),o?(t.directive("lazy",{bind:r.add.bind(r),update:r.update.bind(r),componentUpdated:r.lazyLoadHandler.bind(r),unbind:r.remove.bind(r)}),t.directive("lazy-container",{bind:i.bind.bind(i),componentUpdated:i.update.bind(i),unbind:i.unbind.bind(i)})):(t.directive("lazy",{bind:r.lazyLoadHandler.bind(r),update:function(t,e){E(this.vm.$refs,this.vm.$els),r.add(this.el,{modifiers:this.modifiers||{},arg:this.arg,value:t,oldValue:e},{context:this.vm})},unbind:function(){r.remove(this.el)}}),t.directive("lazy-container",{update:function(t,e){i.update(this.el,{modifiers:this.modifiers||{},arg:this.arg,value:t,oldValue:e},{context:this.vm})},unbind:function(){i.unbind(this.el)}}))}}});