vue-lazyload.js

/*!
 * Vue-Lazyload.js v1.3.4
 * (c) 2021 Awe <hilongjw@gmail.com>
 * Released under the MIT License.
 */
!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e((t="undefined"!=typeof globalThis?globalThis:t||self).VueLazyload={})}(this,(function(t){"use strict";
/*!
   * is-primitive <https://github.com/jonschlinkert/is-primitive>
   *
   * Copyright (c) 2014-2015, Jon Schlinkert.
   * Licensed under the MIT License.
   */var e=function(t){return null==t||"function"!=typeof t&&"object"!=typeof t},r=Object.freeze({__proto__:null,default:e,__moduleExports:e}),i=function(t,e){if(null==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 r=Object.prototype.propertyIsEnumerable,i=Object(t),n=arguments.length,s=0;++s<n;)for(var o=Object(arguments[s]),a=Object.getOwnPropertySymbols(o),d=0;d<a.length;d++){var l=a[d];r.call(o,l)&&(i[l]=o[l])}return i},n=Object.freeze({__proto__:null,default:i,__moduleExports:i}),s=Object.prototype.toString,o=function(t){var e=typeof t;return"undefined"===e?"undefined":null===t?"null":!0===t||!1===t||t instanceof Boolean?"boolean":"string"===e||t instanceof String?"string":"number"===e||t instanceof Number?"number":"function"===e||t instanceof Function?void 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S{constructor({el:t,src:e,error:r,loading:i,bindType:n,$parent:s,options:o,cors:a,elRenderer:d,imageCache:l}){this.el=t,this.src=e,this.error=r,this.loading=i,this.bindType=n,this.attempt=0,this.cors=a,this.naturalHeight=0,this.naturalWidth=0,this.options=o,this.rect=null,this.$parent=s,this.elRenderer=d,this._imageCache=l,this.performanceData={init:Date.now(),loadStart:0,loadEnd:0},this.filter(),this.initState(),this.render("loading",!1)}initState(){"dataset"in this.el?this.el.dataset.src=this.src:this.el.setAttribute("data-src",this.src),this.state={loading:!1,error:!1,loaded:!1,rendered:!1}}record(t){this.performanceData[t]=Date.now()}update({src:t,loading:e,error:r}){const i=this.src;this.src=t,this.loading=e,this.error=r,this.filter(),i!==this.src&&(this.attempt=0,this.initState())}getRect(){this.rect=this.el.getBoundingClientRect()}checkInView(){return this.getRect(),this.rect.top<window.innerHeight*this.options.preLoad&&this.rect.bottom>this.options.preLoadTop&&this.rect.left<window.innerWidth*this.options.preLoad&&this.rect.right>0}filter(){(function(t){if(!(t instanceof Object))return[];if(Object.keys)return Object.keys(t);{let e=[];for(let r in t)t.hasOwnProperty(r)&&e.push(r);return e}})(this.options.filter).map((t=>{this.options.filter[t](this,this.options)}))}renderLoading(t){this.state.loading=!0,$({src:this.loading,cors:this.cors},(e=>{this.render("loading",!1),this.state.loading=!1,t()}),(()=>{t(),this.state.loading=!1,this.options.silent||console.warn(`VueLazyload log: load failed with loading image(${this.loading})`)}))}load(t=C){return this.attempt>this.options.attempt-1&&this.state.error?(this.options.silent||console.log(`VueLazyload log: ${this.src} tried too more than ${this.options.attempt} times`),void t()):this.state.rendered&&this.state.loaded?void 0:this._imageCache.has(this.src)?(this.state.loaded=!0,this.render("loaded",!0),this.state.rendered=!0,t()):void this.renderLoading((()=>{this.attempt++,this.options.adapter.beforeLoad&&this.options.adapter.beforeLoad(this,this.options),this.record("loadStart"),$({src:this.src,cors:this.cors},(e=>{this.naturalHeight=e.naturalHeight,this.naturalWidth=e.naturalWidth,this.state.loaded=!0,this.state.error=!1,this.record("loadEnd"),this.render("loaded",!1),this.state.rendered=!0,this._imageCache.add(this.src),t()}),(t=>{!this.options.silent&&console.error(t),this.state.error=!0,this.state.loaded=!1,this.render("error",!1)}))}))}render(t,e){this.elRenderer(this,t,e)}performance(){let 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}}$destroy(){this.el=null,this.src=null,this.error=null,this.loading=null,this.bindType=null,this.attempt=0}}const Q="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7",R=["scroll","wheel","mousewheel","resize","animationend","transitionend","touchmove"],k={rootMargin:"0px",threshold:0};function B(t){return class{constructor({preLoad:t,error:e,throttleWait:r,preLoadTop:i,dispatchEvent:n,loading:s,attempt:o,silent:a=!0,scale:d,listenEvents:l,hasbind:h,filter:c,adapter:u,observer:p,observerOptions:f}){this.version='"1.3.4"',this.mode=y,this.ListenerQueue=[],this.TargetIndex=0,this.TargetQueue=[],this.options={silent:a,dispatchEvent:!!n,throttleWait:r||200,preLoad:t||1.3,preLoadTop:i||0,error:e||Q,loading:s||Q,attempt:o||3,scale:d||A(d),ListenEvents:l||R,hasbind:!1,supportWebp:j(),filter:c||{},adapter:u||{},observer:!!p,observerOptions:f||k},this._initEvent(),this._imageCache=new H({max:200}),this.lazyLoadHandler=function(t,e){let r=null,i=null,n=0,s=!1;return function(){if(s=!0,r)return;let o=Date.now()-n,a=this,d=arguments,l=function(){n=Date.now(),r=!1,t.apply(a,d)};o>=e?l():r=setTimeout(l,e),s&&(clearTimeout(i),i=setTimeout(l,2*e))}}(this._lazyLoadHandler.bind(this),this.options.throttleWait),this.setMode(this.options.observer?w:y)}config(t={}){g(this.options,t)}performance(){let t=[];return this.ListenerQueue.map((e=>{t.push(e.performance())})),t}addLazyBox(t){this.ListenerQueue.push(t),m&&(this._addListenerTarget(window),this._observer&&this._observer.observe(t.el),t.$el&&t.$el.parentNode&&this._addListenerTarget(t.$el.parentNode))}add(e,r,i){if(function(t,e){let r=!1;for(let i=0,n=t.length;i<n;i++)if(e(t[i])){r=!0;break}return r}(this.ListenerQueue,(t=>t.el===e)))return this.update(e,r),t.nextTick(this.lazyLoadHandler);let{src:n,loading:s,error:o,cors:a}=this._valueFormatter(r.value);t.nextTick((()=>{n=E(e,this.options.scale)||n,this._observer&&this._observer.observe(e);const d=Object.keys(r.modifiers)[0];let l;d&&(l=i.context.$refs[d],l=l?l.$el||l:document.getElementById(d)),l||(l=(t=>{if(!m)return;if(!(t instanceof HTMLElement))return window;let e=t;for(;e&&e!==document.body&&e!==document.documentElement&&e.parentNode;){if(/(scroll|auto)/.test(I(e)))return e;e=e.parentNode}return window})(e));const h=new S({bindType:r.arg,$parent:l,el:e,loading:s,error:o,src:n,cors:a,elRenderer:this._elRenderer.bind(this),options:this.options,imageCache:this._imageCache});this.ListenerQueue.push(h),m&&(this._addListenerTarget(window),this._addListenerTarget(l)),this.lazyLoadHandler(),t.nextTick((()=>this.lazyLoadHandler()))}))}update(e,r,i){let{src:n,loading:s,error:o}=this._valueFormatter(r.value);n=E(e,this.options.scale)||n;const a=z(this.ListenerQueue,(t=>t.el===e));a?a.update({src:n,loading:s,error:o}):this.add(e,r,i),this._observer&&(this._observer.unobserve(e),this._observer.observe(e)),this.lazyLoadHandler(),t.nextTick((()=>this.lazyLoadHandler()))}remove(t){if(!t)return;this._observer&&this._observer.unobserve(t);const e=z(this.ListenerQueue,(e=>e.el===t));e&&(this._removeListenerTarget(e.$parent),this._removeListenerTarget(window),L(this.ListenerQueue,e),e.$destroy())}removeComponent(t){t&&(L(this.ListenerQueue,t),this._observer&&this._observer.unobserve(t.el),t.$parent&&t.$el.parentNode&&this._removeListenerTarget(t.$el.parentNode),this._removeListenerTarget(window))}setMode(t){v||t!==w||(t=y),this.mode=t,t===y?(this._observer&&(this.ListenerQueue.forEach((t=>{this._observer.unobserve(t.el)})),this._observer=null),this.TargetQueue.forEach((t=>{this._initListen(t.el,!0)}))):(this.TargetQueue.forEach((t=>{this._initListen(t.el,!1)})),this._initIntersectionObserver())}_addListenerTarget(t){if(!t)return;let e=z(this.TargetQueue,(e=>e.el===t));return e?e.childrenCount++:(e={el:t,id:++this.TargetIndex,childrenCount:1,listened:!0},this.mode===y&&this._initListen(e.el,!0),this.TargetQueue.push(e)),this.TargetIndex}_removeListenerTarget(t){this.TargetQueue.forEach(((e,r)=>{e.el===t&&(e.childrenCount--,e.childrenCount||(this._initListen(e.el,!1),this.TargetQueue.splice(r,1),e=null))}))}_initListen(t,e){this.options.ListenEvents.forEach((r=>O[e?"on":"off"](t,r,this.lazyLoadHandler)))}_initEvent(){this.Event={listeners:{loading:[],loaded:[],error:[]}},this.$on=(t,e)=>{this.Event.listeners[t]||(this.Event.listeners[t]=[]),this.Event.listeners[t].push(e)},this.$once=(t,e)=>{const r=this;this.$on(t,(function i(){r.$off(t,i),e.apply(r,arguments)}))},this.$off=(t,e)=>{if(e)L(this.Event.listeners[t],e);else{if(!this.Event.listeners[t])return;this.Event.listeners[t].length=0}},this.$emit=(t,e,r)=>{this.Event.listeners[t]&&this.Event.listeners[t].forEach((t=>t(e,r)))}}_lazyLoadHandler(){const t=[];this.ListenerQueue.forEach(((e,r)=>{e.el&&e.el.parentNode||t.push(e);e.checkInView()&&e.load()})),t.forEach((t=>{L(this.ListenerQueue,t),t.$destroy()}))}_initIntersectionObserver(){v&&(this._observer=new IntersectionObserver(this._observerHandler.bind(this),this.options.observerOptions),this.ListenerQueue.length&&this.ListenerQueue.forEach((t=>{this._observer.observe(t.el)})))}_observerHandler(t,e){t.forEach((t=>{t.isIntersecting&&this.ListenerQueue.forEach((e=>{if(e.el===t.target){if(e.state.loaded)return this._observer.unobserve(e.el);e.load()}}))}))}_elRenderer(t,e,r){if(!t.el)return;const{el:i,bindType:n}=t;let s;switch(e){case"loading":s=t.loading;break;case"error":s=t.error;break;default:s=t.src}if(n?i.style[n]='url("'+s+'")':i.getAttribute("src")!==s&&i.setAttribute("src",s),i.setAttribute("lazy",e),this.$emit(e,t,r),this.options.adapter[e]&&this.options.adapter[e](t,this.options),this.options.dispatchEvent){const r=new _(e,{detail:t});i.dispatchEvent(r)}}_valueFormatter(t){let e=t,r=this.options.loading,i=this.options.error;var n;return null!==(n=t)&&"object"==typeof n&&(t.src||this.options.silent||console.error("Vue Lazyload warning: miss src with "+t),e=t.src,r=t.loading||this.options.loading,i=t.error||this.options.error),{src:e,loading:r,error:i}}}}B.install=(t,e={})=>{const r=new(B(t))(e);"2"===t.version.split(".")[0]?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",{bind:r.lazyLoadHandler.bind(r),update(t,e){g(this.vm.$refs,this.vm.$els),r.add(this.el,{modifiers:this.modifiers||{},arg:this.arg,value:t,oldValue:e},{context:this.vm})},unbind(){r.remove(this.el)}})};const W=t=>({props:{tag:{type:String,default:"div"}},render(t){return t(this.tag,null,this.show?this.$slots.default:null)},data:()=>({el:null,state:{loaded:!1},rect:{},show:!1}),mounted(){this.el=this.$el,t.addLazyBox(this),t.lazyLoadHandler()},beforeDestroy(){t.removeComponent(this)},methods:{getRect(){this.rect=this.$el.getBoundingClientRect()},checkInView(){return this.getRect(),m&&this.rect.top<window.innerHeight*t.options.preLoad&&this.rect.bottom>0&&this.rect.left<window.innerWidth*t.options.preLoad&&this.rect.right>0},load(){this.show=!0,this.state.loaded=!0,this.$emit("show",this)},destroy(){return this.$destroy}}});W.install=function(t,e={}){const r=new(B(t))(e);t.component("lazy-component",W(r))};class D{constructor({lazy:t}){this.lazy=t,t.lazyContainerMananger=this,this._queue=[]}bind(t,e,r){const i=new P({el:t,binding:e,vnode:r,lazy:this.lazy});this._queue.push(i)}update(t,e,r){const i=z(this._queue,(e=>e.el===t));i&&i.update({el:t,binding:e,vnode:r})}unbind(t,e,r){const i=z(this._queue,(e=>e.el===t));i&&(i.clear(),L(this._queue,i))}}const V={selector:"img"};class P{constructor({el:t,binding:e,vnode:r,lazy:i}){this.el=null,this.vnode=r,this.binding=e,this.options={},this.lazy=i,this._queue=[],this.update({el:t,binding:e})}update({el:t,binding:e}){this.el=t,this.options=g({},V,e.value);this.getImgs().forEach((t=>{this.lazy.add(t,g({},this.binding,{value:{src:"dataset"in t?t.dataset.src:t.getAttribute("data-src"),error:("dataset"in t?t.dataset.error:t.getAttribute("data-error"))||this.options.error,loading:("dataset"in t?t.dataset.loading:t.getAttribute("data-loading"))||this.options.loading}}),this.vnode)}))}getImgs(){return function(t){let e=t.length;const r=[];for(let i=0;i<e;i++)r.push(t[i]);return r}(this.el.querySelectorAll(this.options.selector))}clear(){this.getImgs().forEach((t=>this.lazy.remove(t))),this.vnode=null,this.binding=null,this.lazy=null}}P.install=(t,e={})=>{const r=new(B(t))(e),i=new P({lazy:r});"2"===t.version.split(".")[0]?t.directive("lazy-container",{bind:i.bind.bind(i),componentUpdated:i.update.bind(i),unbind:i.unbind.bind(i)}):t.directive("lazy-container",{update(t,e){i.update(this.el,{modifiers:this.modifiers||{},arg:this.arg,value:t,oldValue:e},{context:this.vm})},unbind(){i.unbind(this.el)}})};const M=t=>({props:{src:[String,Object],tag:{type:String,default:"img"}},render(t){return t(this.tag,{attrs:{src:this.renderSrc}},this.$slots.default)},data:()=>({el:null,options:{src:"",error:"",loading:"",attempt:t.options.attempt},state:{loaded:!1,error:!1,attempt:0},rect:{},renderSrc:""}),watch:{src(){this.init(),t.addLazyBox(this),t.lazyLoadHandler()}},created(){this.init(),this.renderSrc=this.options.loading},mounted(){this.el=this.$el,t.addLazyBox(this),t.lazyLoadHandler()},beforeDestroy(){t.removeComponent(this)},methods:{init(){const{src:e,loading:r,error:i}=t._valueFormatter(this.src);this.state.loaded=!1,this.options.src=e,this.options.error=i,this.options.loading=r,this.renderSrc=this.options.loading},getRect(){this.rect=this.$el.getBoundingClientRect()},checkInView(){return this.getRect(),m&&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(e=C){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 ${this.options.attempt} times`),void e();const r=this.options.src;$({src:r},(({src:t})=>{this.renderSrc=t,this.state.loaded=!0}),(t=>{this.state.attempt++,this.renderSrc=this.options.error,this.state.error=!0}))}}});M.install=(t,e={})=>{const r=new(B(t))(e);t.component("lazy-image",M(r))};var N={install(t,e={}){const r=new(B(t))(e),i=new D({lazy:r}),n="2"===t.version.split(".")[0];t.prototype.$Lazyload=r,e.lazyComponent&&t.component("lazy-component",W(r)),e.lazyImage&&t.component("lazy-image",M(r)),n?(t.directive("lazy",{bind:r.add.bind(r),update:r.update.bind(r),componentUpdated:r.lazyLoadHandler.bind(r),unbind:r.remove.bind(r)}),t.directive("lazy-container",{bind:i.bind.bind(i),componentUpdated:i.update.bind(i),unbind:i.unbind.bind(i)})):(t.directive("lazy",{bind:r.lazyLoadHandler.bind(r),update(t,e){g(this.vm.$refs,this.vm.$els),r.add(this.el,{modifiers:this.modifiers||{},arg:this.arg,value:t,oldValue:e},{context:this.vm})},unbind(){r.remove(this.el)}}),t.directive("lazy-container",{update(t,e){i.update(this.el,{modifiers:this.modifiers||{},arg:this.arg,value:t,oldValue:e},{context:this.vm})},unbind(){i.unbind(this.el)}}))}};t.Lazy=B,t.LazyComponent=W,t.LazyContainer=D,t.LazyImage=M,t.default=N,Object.defineProperty(t,"__esModule",{value:!0})}));