vue-lazyload.js

/*!
 * Vue-Lazyload.js v1.2.3
 * (c) 2018 Awe <hilongjw@gmail.com>
 * Released under the MIT License.
 */
!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):e.VueLazyload=t()}(this,function(){"use strict";function e(e){return e.constructor&&"function"==typeof e.constructor.isBuffer&&e.constructor.isBuffer(e)}function t(e){e=e||{};var t=arguments.length,i=0;if(1===t)return e;for(;++i<t;){var o=arguments[i];g(e)&&(e=o),r(o)&&n(e,o)}return e}function n(e,n){m(e,n);for(var o in n)if("__proto__"!==o&&i(n,o)){var a=n[o];r(a)?("undefined"===L(e[o])&&"function"===L(a)&&(e[o]=a),e[o]=t(e[o]||{},a)):e[o]=a}return e}function r(e){return"object"===L(e)||"function"===L(e)}function i(e,t){return Object.prototype.hasOwnProperty.call(e,t)}function o(e,t){if(e.length){var n=e.indexOf(t);return n>-1?e.splice(n,1):void 0}}function a(e,t){for(var n=!1,r=0,i=e.length;r<i;r++)if(t(e[r])){n=!0;break}return n}function s(e,t){if("IMG"===e.tagName&&e.getAttribute("data-srcset")){var n=e.getAttribute("data-srcset"),r=[],i=e.parentNode,o=i.offsetWidth*t,a=void 0,s=void 0,u=void 0;n=n.trim().split(","),n.map(function(e){e=e.trim(),a=e.lastIndexOf(" "),-1===a?(s=e,u=999998):(s=e.substr(0,a),u=parseInt(e.substr(a+1,e.length-a-2),10)),r.push([u,s])}),r.sort(function(e,t){if(e[0]<t[0])return-1;if(e[0]>t[0])return 1;if(e[0]===t[0]){if(-1!==t[1].indexOf(".webp",t[1].length-5))return 1;if(-1!==e[1].indexOf(".webp",e[1].length-5))return-1}return 0});for(var l="",d=void 0,c=r.length,h=0;h<c;h++)if(d=r[h],d[0]>=o){l=d[1];break}return l}}function u(e,t){for(var n=void 0,r=0,i=e.length;r<i;r++)if(t(e[r])){n=e[r];break}return n}function l(){if(!k)return!1;var e=!0,t=document;try{var n=t.createElement("object");n.type="image/webp",n.style.visibility="hidden",n.innerHTML="!",t.body.appendChild(n),e=!n.offsetWidth,t.body.removeChild(n)}catch(t){e=!1}return e}function d(e,t){var n=null,r=0;return function(){if(!n){var i=Date.now()-r,o=this,a=arguments,s=function(){r=Date.now(),n=!1,e.apply(o,a)};i>=t?s():n=setTimeout(s,t)}}}function c(e){return null!==e&&"object"===(void 0===e?"undefined":p(e))}function h(e){if(!(e instanceof Object))return[];if(Object.keys)return Object.keys(e);var t=[];for(var n in e)e.hasOwnProperty(n)&&t.push(n);return t}function f(e){for(var t=e.length,n=[],r=0;r<t;r++)n.push(e[r]);return n}function v(){}var p="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e},b=function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")},y=function(){function e(e,t){for(var n=0;n<t.length;n++){var r=t[n];r.enumerable=r.enumerable||!1,r.configurable=!0,"value"in r&&(r.writable=!0),Object.defineProperty(e,r.key,r)}}return function(t,n,r){return n&&e(t.prototype,n),r&&e(t,r),t}}(),g=function(e){return null==e||"function"!=typeof e&&"object"!==(void 0===e?"undefined":p(e))},m=function(e,t){if(null===e||void 0===e)throw new TypeError("expected first argument to be an object.");if(void 0===t||"undefined"==typeof Symbol)return e;if("function"!=typeof Object.getOwnPropertySymbols)return e;for(var n=Object.prototype.propertyIsEnumerable,r=Object(e),i=arguments.length,o=0;++o<i;)for(var a=Object(arguments[o]),s=Object.getOwnPropertySymbols(a),u=0;u<s.length;u++){var l=s[u];n.call(a,l)&&(r[l]=a[l])}return r},w=Object.prototype.toString,L=function(t){var n=void 0===t?"undefined":p(t);return"undefined"===n?"undefined":null===t?"null":!0===t||!1===t||t instanceof Boolean?"boolean":"string"===n||t instanceof String?"string":"number"===n||t instanceof Number?"number":"function"===n||t instanceof Function?void 0!==t.constructor.name&&"Generator"===t.constructor.name.slice(0,9)?"generatorfunction":"function":void 0!==Array.isArray&&Array.isArray(t)?"array":t instanceof RegExp?"regexp":t instanceof Date?"date":(n=w.call(t),"[object RegExp]"===n?"regexp":"[object Date]"===n?"date":"[object Arguments]"===n?"arguments":"[object Error]"===n?"error":"[object Promise]"===n?"promise":e(t)?"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")},_=t,k="undefined"!=typeof window,E=k&&"IntersectionObserver"in window,A={event:"event",observer:"observer"},j=function(){function e(e,t){t=t||{bubbles:!1,cancelable:!1,detail:void 0};var n=document.createEvent("CustomEvent");return n.initCustomEvent(e,t.bubbles,t.cancelable,t.detail),n}if(k)return"function"==typeof window.CustomEvent?window.CustomEvent:(e.prototype=window.Event.prototype,e)}(),z=function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:1;return k?window.devicePixelRatio||e:e},T=function(){if(k){var e=!1;try{var t=Object.defineProperty({},"passive",{get:function(){e=!0}});window.addEventListener("test",null,t)}catch(e){}return e}}(),O={on:function(e,t,n){var r=arguments.length>3&&void 0!==arguments[3]&&arguments[3];T?e.addEventListener(t,n,{capture:r,passive:!0}):e.addEventListener(t,n,r)},off:function(e,t,n){var r=arguments.length>3&&void 0!==arguments[3]&&arguments[3];e.removeEventListener(t,n,r)}},I=function(e,t,n){var r=new Image;r.src=e.src,r.onload=function(){t({naturalHeight:r.naturalHeight,naturalWidth:r.naturalWidth,src:r.src})},r.onerror=function(e){n(e)}},x=function(e,t){return"undefined"!=typeof getComputedStyle?getComputedStyle(e,null).getPropertyValue(t):e.style[t]},S=function(e){return x(e,"overflow")+x(e,"overflow-y")+x(e,"overflow-x")},$=function(e){if(k){if(!(e instanceof HTMLElement))return window;for(var t=e;t&&t!==document.body&&t!==document.documentElement&&t.parentNode;){if(/(scroll|auto)/.test(S(t)))return t;t=t.parentNode}return window}},H={},Q=function(){function e(t){var n=t.el,r=t.src,i=t.error,o=t.loading,a=t.bindType,s=t.$parent,u=t.options,l=t.elRenderer;b(this,e),this.el=n,this.src=r,this.error=i,this.loading=o,this.bindType=a,this.attempt=0,this.naturalHeight=0,this.naturalWidth=0,this.options=u,this.rect=null,this.$parent=s,this.elRenderer=l,this.performanceData={init:Date.now(),loadStart:0,loadEnd:0},this.filter(),this.initState(),this.render("loading",!1)}return y(e,[{key:"initState",value:function(){this.el.dataset.src=this.src,this.state={error:!1,loaded:!1,rendered:!1}}},{key:"record",value:function(e){this.performanceData[e]=Date.now()}},{key:"update",value:function(e){var t=e.src,n=e.loading,r=e.error,i=this.src;this.src=t,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(),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}},{key:"filter",value:function(){var e=this;h(this.options.filter).map(function(t){e.options.filter[t](e,e.options)})}},{key:"renderLoading",value:function(e){var t=this;I({src:this.loading},function(n){t.render("loading",!1),e()},function(){e(),t.options.silent||console.warn("VueLazyload log: load failed with loading image("+t.loading+")")})}},{key:"load",value:function(){var e=this,t=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 t()):this.state.loaded||H[this.src]?(this.state.loaded=!0,t(),this.render("loaded",!0)):void this.renderLoading(function(){e.attempt++,e.record("loadStart"),I({src:e.src},function(n){e.naturalHeight=n.naturalHeight,e.naturalWidth=n.naturalWidth,e.state.loaded=!0,e.state.error=!1,e.record("loadEnd"),e.render("loaded",!1),H[e.src]=1,t()},function(t){!e.options.silent&&console.error(t),e.state.error=!0,e.state.loaded=!1,e.render("error",!1)})})}},{key:"render",value:function(e,t){this.elRenderer(this,e,t)}},{key:"performance",value:function(){var e="loading",t=0;return this.state.loaded&&(e="loaded",t=(this.performanceData.loadEnd-this.performanceData.loadStart)/1e3),this.state.error&&(e="error"),{src:this.src,state:e,time:t}}},{key:"destroy",value:function(){this.el=null,this.src=null,this.error=null,this.loading=null,this.bindType=null,this.attempt=0}}]),e}(),C="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7",R=["scroll","wheel","mousewheel","resize","animationend","transitionend","touchmove"],W={rootMargin:"0px",threshold:0},D=function(e){return function(){function t(e){var n=e.preLoad,r=e.error,i=e.throttleWait,o=e.preLoadTop,a=e.dispatchEvent,s=e.loading,u=e.attempt,c=e.silent,h=void 0===c||c,f=e.scale,v=e.listenEvents,p=(e.hasbind,e.filter),y=e.adapter,g=e.observer,m=e.observerOptions;b(this,t),this.version="1.2.3",this.mode=A.event,this.ListenerQueue=[],this.TargetIndex=0,this.TargetQueue=[],this.options={silent:h,dispatchEvent:!!a,throttleWait:i||200,preLoad:n||1.3,preLoadTop:o||0,error:r||C,loading:s||C,attempt:u||3,scale:f||z(f),ListenEvents:v||R,hasbind:!1,supportWebp:l(),filter:p||{},adapter:y||{},observer:!!g,observerOptions:m||W},this._initEvent(),this.lazyLoadHandler=d(this._lazyLoadHandler.bind(this),this.options.throttleWait),this.setMode(this.options.observer?A.observer:A.event)}return y(t,[{key:"config",value:function(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{};_(this.options,e)}},{key:"performance",value:function(){var e=[];return this.ListenerQueue.map(function(t){e.push(t.performance())}),e}},{key:"addLazyBox",value:function(e){this.ListenerQueue.push(e),k&&(this._addListenerTarget(window),this._observer&&this._observer.observe(e.el),e.$el&&e.$el.parentNode&&this._addListenerTarget(e.$el.parentNode))}},{key:"add",value:function(t,n,r){var i=this;if(a(this.ListenerQueue,function(e){return e.el===t}))return this.update(t,n),e.nextTick(this.lazyLoadHandler);var o=this._valueFormatter(n.value),u=o.src,l=o.loading,d=o.error;e.nextTick(function(){u=s(t,i.options.scale)||u,i._observer&&i._observer.observe(t);var o=Object.keys(n.modifiers)[0],a=void 0;o&&(a=r.context.$refs[o],a=a?a.$el||a:document.getElementById(o)),a||(a=$(t));var c=new Q({bindType:n.arg,$parent:a,el:t,loading:l,error:d,src:u,elRenderer:i._elRenderer.bind(i),options:i.options});i.ListenerQueue.push(c),k&&(i._addListenerTarget(window),i._addListenerTarget(a)),i.lazyLoadHandler(),e.nextTick(function(){return i.lazyLoadHandler()})})}},{key:"update",value:function(t,n){var r=this,i=this._valueFormatter(n.value),o=i.src,a=i.loading,l=i.error;o=s(t,this.options.scale)||o;var d=u(this.ListenerQueue,function(e){return e.el===t});d&&d.update({src:o,loading:a,error:l}),this._observer&&(this._observer.unobserve(t),this._observer.observe(t)),this.lazyLoadHandler(),e.nextTick(function(){return r.lazyLoadHandler()})}},{key:"remove",value:function(e){if(e){this._observer&&this._observer.unobserve(e);var t=u(this.ListenerQueue,function(t){return t.el===e});t&&(this._removeListenerTarget(t.$parent),this._removeListenerTarget(window),o(this.ListenerQueue,t)&&t.destroy())}}},{key:"removeComponent",value:function(e){e&&(o(this.ListenerQueue,e),this._observer&&this._observer.unobserve(e.el),e.$parent&&e.$el.parentNode&&this._removeListenerTarget(e.$el.parentNode),this._removeListenerTarget(window))}},{key:"setMode",value:function(e){var t=this;E||e!==A.observer||(e=A.event),this.mode=e,e===A.event?(this._observer&&(this.ListenerQueue.forEach(function(e){t._observer.unobserve(e.el)}),this._observer=null),this.TargetQueue.forEach(function(e){t._initListen(e.el,!0)})):(this.TargetQueue.forEach(function(e){t._initListen(e.el,!1)}),this._initIntersectionObserver())}},{key:"_addListenerTarget",value:function(e){if(e){var t=u(this.TargetQueue,function(t){return t.el===e});return t?t.childrenCount++:(t={el:e,id:++this.TargetIndex,childrenCount:1,listened:!0},this.mode===A.event&&this._initListen(t.el,!0),this.TargetQueue.push(t)),this.TargetIndex}}},{key:"_removeListenerTarget",value:function(e){var t=this;this.TargetQueue.forEach(function(n,r){n.el===e&&(--n.childrenCount||(t._initListen(n.el,!1),t.TargetQueue.splice(r,1),n=null))})}},{key:"_initListen",value:function(e,t){var n=this;this.options.ListenEvents.forEach(function(r){return O[t?"on":"off"](e,r,n.lazyLoadHandler)})}},{key:"_initEvent",value:function(){var e=this;this.Event={listeners:{loading:[],loaded:[],error:[]}},this.$on=function(t,n){e.Event.listeners[t].push(n)},this.$once=function(t,n){function r(){i.$off(t,r),n.apply(i,arguments)}var i=e;e.$on(t,r)},this.$off=function(t,n){if(!n)return void(e.Event.listeners[t]=[]);o(e.Event.listeners[t],n)},this.$emit=function(t,n,r){e.Event.listeners[t].forEach(function(e){return e(n,r)})}}},{key:"_lazyLoadHandler",value:function(){var e=this,t=!1;this.ListenerQueue.forEach(function(n,r){n.state.loaded||(t=n.checkInView())&&n.load(function(){!n.error&&n.loaded&&e.ListenerQueue.splice(r,1)})})}},{key:"_initIntersectionObserver",value:function(){var e=this;E&&(this._observer=new IntersectionObserver(this._observerHandler.bind(this),this.options.observerOptions),this.ListenerQueue.length&&this.ListenerQueue.forEach(function(t){e._observer.observe(t.el)}))}},{key:"_observerHandler",value:function(e,t){var n=this;e.forEach(function(e){e.isIntersecting&&n.ListenerQueue.forEach(function(t){if(t.el===e.target){if(t.state.loaded)return n._observer.unobserve(t.el);t.load()}})})}},{key:"_elRenderer",value:function(e,t,n){if(e.el){var r=e.el,i=e.bindType,o=void 0;switch(t){case"loading":o=e.loading;break;case"error":o=e.error;break;default:o=e.src}if(i?r.style[i]='url("'+o+'")':r.getAttribute("src")!==o&&r.setAttribute("src",o),r.setAttribute("lazy",t),this.$emit(t,e,n),this.options.adapter[t]&&this.options.adapter[t](e,this.options),this.options.dispatchEvent){var a=new j(t,{detail:e});r.dispatchEvent(a)}}}},{key:"_valueFormatter",value:function(e){var t=e,n=this.options.loading,r=this.options.error;return c(e)&&(e.src||this.options.silent||console.error("Vue Lazyload warning: miss src with "+e),t=e.src,n=e.loading||this.options.loading,r=e.error||this.options.error),{src:t,loading:n,error:r}}}]),t}()},B=function(e){return{props:{tag:{type:String,default:"div"}},render:function(e){return!1===this.show?e(this.tag):e(this.tag,null,this.$slots.default)},data:function(){return{el:null,state:{loaded:!1},rect:{},show:!1}},mounted:function(){this.el=this.$el,e.addLazyBox(this),e.lazyLoadHandler()},beforeDestroy:function(){e.removeComponent(this)},methods:{getRect:function(){this.rect=this.$el.getBoundingClientRect()},checkInView:function(){return this.getRect(),k&&this.rect.top<window.innerHeight*e.options.preLoad&&this.rect.bottom>0&&this.rect.left<window.innerWidth*e.options.preLoad&&this.rect.right>0},load:function(){this.show=!0,this.state.loaded=!0,this.$emit("show",this)}}}},V=function(){function e(t){var n=t.lazy;b(this,e),this.lazy=n,n.lazyContainerMananger=this,this._queue=[]}return y(e,[{key:"bind",value:function(e,t,n){var r=new N({el:e,binding:t,vnode:n,lazy:this.lazy});this._queue.push(r)}},{key:"update",value:function(e,t,n){var r=u(this._queue,function(t){return t.el===e});r&&r.update({el:e,binding:t,vnode:n})}},{key:"unbind",value:function(e,t,n){var r=u(this._queue,function(t){return t.el===e});r&&(r.clear(),o(this._queue,r))}}]),e}(),M={selector:"img"},N=function(){function e(t){var n=t.el,r=t.binding,i=t.vnode,o=t.lazy;b(this,e),this.el=null,this.vnode=i,this.binding=r,this.options={},this.lazy=o,this._queue=[],this.update({el:n,binding:r})}return y(e,[{key:"update",value:function(e){var t=this,n=e.el,r=e.binding;this.el=n,this.options=_({},M,r.value),this.getImgs().forEach(function(e){t.lazy.add(e,_({},t.binding,{value:{src:e.dataset.src,error:e.dataset.error,loading:e.dataset.loading}}),t.vnode)})}},{key:"getImgs",value:function(){return f(this.el.querySelectorAll(this.options.selector))}},{key:"clear",value:function(){var e=this;this.getImgs().forEach(function(t){return e.lazy.remove(t)}),this.vnode=null,this.binding=null,this.lazy=null}}]),e}();return{install:function(e){var t=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},n=D(e),r=new n(t),i=new V({lazy:r}),o="2"===e.version.split(".")[0];e.prototype.$Lazyload=r,t.lazyComponent&&e.component("lazy-component",B(r)),o?(e.directive("lazy",{bind:r.add.bind(r),update:r.update.bind(r),componentUpdated:r.lazyLoadHandler.bind(r),unbind:r.remove.bind(r)}),e.directive("lazy-container",{bind:i.bind.bind(i),update:i.update.bind(i),unbind:i.unbind.bind(i)})):(e.directive("lazy",{bind:r.lazyLoadHandler.bind(r),update:function(e,t){_(this.vm.$refs,this.vm.$els),r.add(this.el,{modifiers:this.modifiers||{},arg:this.arg,value:e,oldValue:t},{context:this.vm})},unbind:function(){r.remove(this.el)}}),e.directive("lazy-container",{update:function(e,t){i.update(this.el,{modifiers:this.modifiers||{},arg:this.arg,value:e,oldValue:t},{context:this.vm})},unbind:function(){i.unbind(this.el)}}))}}});