image-lazyload
Version:
Loaded images of lazy loading components. Compatible with IE7 + browser.
293 lines (288 loc) • 37.8 kB
JavaScript
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define(factory) :
typeof define === 'function' && (define.cmd || define.hjs) ? define(function(require,exports,module){module.exports = factory()}) :
(global.Lazyload = factory());
}(this, (function () { 'use strict';
var $Blob = (function (array, option) {
if (window.Blob) {
return new Blob(array, option);
}
else {
window.BlobBuilder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder || window.MSBlobBuilder;
if (window.BlobBuilder) {
var bb = new BlobBuilder();
bb.append(array);
return bb.getBlob(typeof option === 'object' ? option.type : undefined);
}
return bb;
}
});
var $addEvent = (function (e, type, fn, mark) {
if (e.addEventListener) {
e.addEventListener(type, fn, false);
}
else if (e.attachEvent) {
//e.detachEvent('on'+type,fn);
e.attachEvent('on' + type, function () {
fn.call(e, window.event);
});
}
});
var $URL = window.URL || window.webkitURL || window.mozURL || window.msURL;
var Lazyload = /** @class */ (function () {
function Lazyload(obj) {
var _ts = this;
var config = _ts.config = {}, data = _ts.data = {}, o = _ts.obj = {
doc: document.documentElement,
body: document.body
}, blankImg = 'data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWNgYGBgAAAABQABh6FO1AAAAABJRU5ErkJggg==';
for (var i in obj) {
_ts.config[i] = obj[i];
}
//默认容差在100像
_ts.config['range'] = typeof _ts.config['range'] === 'numver' ? _ts.config['range'] : 100;
//图片方法扩展
_ts.imageExtend();
//图片数据处理
for (var i = 0, len = config.obj.length; i < len; i++) {
var item = config.obj[i], dataSrc = item.lazy_dataSrc = item.getAttribute('data-src'), dataCover = item.lazy_dataCover = item.getAttribute('data-cover');
if (item.src === '') {
item.src = blankImg;
}
item.removeAttribute('data-src');
//将获取的对象存储起来
if (data[dataSrc] === undefined) {
data[dataSrc] = [];
}
data[dataSrc].push(item);
}
}
Lazyload.prototype.init = function () {
var _ts = this, config = _ts.config, data = _ts.data, o = _ts.obj, task, temp;
//图片更新执行
(task = function () {
//得到当前屏幕区域的需要更新图片列表
var eList = _ts.getShowList();
//遍历加载图片
for (var i = 0, len = eList.length; i < len; i++) {
var item = eList[i], key = item.lazy_dataSrc;
_ts.loadImg(item);
}
})();
var run = function () {
clearTimeout(temp);
temp = setTimeout(task, 200);
};
$addEvent(window, 'scroll', run);
$addEvent(window, 'resize', run);
};
/**
* 图片方法扩展
*
* @memberof Lazyload
*/
Lazyload.prototype.imageExtend = function () {
var _ts = this;
Image.prototype.load = function (url, oL) {
var updateImg = function (src) {
//更新图片
for (var i = 0, len = oL.length; i < len; i++) {
var item = oL[i];
_ts.updateImg(item, src);
}
}, updateTips = function (o) {
//更新提示
for (var i = 0, len = oL.length; i < len; i++) {
var item = oL[i];
item.completedPercentage = o;
o.o = item;
_ts.tips(o);
}
};
if ($Blob && $URL && XMLHttpRequest) {
var xhr_1 = new XMLHttpRequest();
xhr_1.open('GET', url, true);
xhr_1.responseType = 'arraybuffer';
xhr_1.onload = function (e) {
var headers = xhr_1.getAllResponseHeaders(), m = headers.match(/^Content-Type\:\s*(.*?)$/mi), mimeType = m[1] || 'image/png', blob = $Blob([this.response], {
type: mimeType
}), src = $URL.createObjectURL(blob);
updateImg(src);
};
xhr_1.onloadstart = xhr_1.onprogress = xhr_1.onloadend = function (e) {
var o = {
loaded: e.loaded,
total: e.total,
status: e.type,
schedule: e.loaded === 0 ? 0 : e.loaded / e.total
};
updateTips(o);
};
xhr_1.send();
}
else {
var o_1 = {
loaded: undefined,
total: undefined,
status: 'loaded',
schedule: 0
}, temp_1;
temp_1 = setInterval(function () {
if (o_1.schedule > 0.98) {
clearInterval(temp_1);
}
o_1.schedule = o_1.schedule + 0.01;
o_1.status = 'progress';
updateTips(o_1);
}, 100);
this.onload = function () {
clearInterval(temp_1);
updateImg(this.src);
o_1.status = 'loaded';
o_1.schedule = 1;
updateTips(o_1);
};
}
};
};
/**
* 获取浏览器窗口大小
*
* @returns {object} 容器宽高
* @memberof Lazyload
*/
Lazyload.prototype.getWinSize = function () {
var _ts = this, o = _ts.obj;
var o = {
w: window.innerWidth || o.doc.clientWidth,
h: window.innerHeight || o.doc.clientHeight
};
return o;
};
/**
* 获取页面滚动的像素
*/
Lazyload.prototype.getWinScroll = function () {
var _ts = this, o = _ts.obj;
var d = {
// x: window.scrollX || document.compatMode == "BackCompat" ? document.body.scrollLeft : document.documentElement.scrollLeft,
// y: window.scrollY || document.compatMode == "BackCompat" ? document.body.scrollTop : document.documentElement.scrollTop
x: window.scrollX || document.documentElement.scrollLeft || window.pageXOffset || document.body.scrollLeft,
y: window.scrollY || document.documentElement.scrollTop || window.pageYOffset || document.body.scrollTop
};
return d;
};
Lazyload.prototype.loadImg = function (o) {
var _ts = this, data = _ts.data;
//已经加载过的则不处理
if (o.lazy_isInit) {
return;
}
var list = data[o.lazy_dataSrc];
// if(o.tagName === 'IMG'){
// o.load(o.lazy_dataSrc,list);
// }else{
var img = new Image();
img.load(o.lazy_dataSrc, list);
img.src = o.lazy_dataSrc;
// if($Blob){
// img.load(o.lazy_dataSrc, list);
// }else{
// //模拟加载
// img.onload = function(){
// for(let i=0,len=list.length; i<len; i++){
// let item = list[i];
// _ts.updateImg(item,src);
// };
// };
// };
// };
//更新图片地址相同的元素
for (var i = 0, len = list.length; i < len; i++) {
var item = list[i];
if (item.lazy_isInit) {
continue;
}
item.lazy_isInit = true;
if (item.lazy_dataCover) {
_ts.updateImg(item, item.lazy_dataCover);
}
}
};
/**
* 更新图片
*
* @param {object} o 需要更新的元素
* @param {string} url 图片地址
* @memberof Lazyload
*/
Lazyload.prototype.updateImg = function (o, url) {
if (o.tagName === 'IMG') {
o.src = url;
}
else {
o.style.backgroundImage = "url(" + url + ")";
}
};
Lazyload.prototype.getElementTop = function (element) {
var actualTop = element.offsetTop, current = element.offsetParent;
while (current !== null) {
actualTop += current.offsetTop;
current = current.offsetParent;
}
return actualTop;
};
Lazyload.prototype.getElementLeft = function (element) {
var actualLeft = element.offsetLeft, current = element.offsetParent;
while (current !== null) {
actualLeft += current.offsetLeft;
current = current.offsetParent;
}
return actualLeft;
};
/**
* 获取需要显示的元素
*/
Lazyload.prototype.getShowList = function () {
var _ts = this, config = _ts.config, data = _ts.data;
var scroll = _ts.getWinScroll(), winSize = _ts.getWinSize(), temp = [];
//console.log(scroll,winSize)
for (var i = 0, len = config.obj.length; i < len; i++) {
var item = config.obj[i], left = _ts.getElementLeft(item), top = _ts.getElementTop(item), width = item.clientWidth, height = item.clientHeight, xl = left + width - scroll.x > 0 - config.range, //页面左侧显示条件
xr = winSize.w + scroll.x + config.range > left, //页面右侧显示条件
yt = top + height - scroll.y > 0 - config.range, //页面顶部显示条件
yb = top < scroll.y + winSize.h + config.range, //页面底部显示条件
isInit = item.lazy_isInit;
//console.log(item,isInit,'left',left,'top',top,'width',width,'height',height);
if (xl && xr && yt && yb && !isInit) {
temp.push(item);
}
}
return temp;
};
/**
* 默认的提示方法
* @param obj --
*/
Lazyload.prototype.tips = function (obj) {
var schedule = parseInt(obj.schedule * 100) + '%', o = obj.o;
if (o.lazy_isEchoTip === undefined) {
o.lazy_isEchoTip = true;
o.lazy_oTip = document.createElement('span');
o.lazy_oTip.className = 'lazy_tip';
o.parentNode.insertBefore(o.lazy_oTip, o.nextSibling);
//console.log(o.lazy_otip.parentNode)
}
o.lazy_oTip.innerHTML = schedule;
//当加载进度为1时,则移除对应的加载提示
if (obj.schedule === 1 && o.lazy_isEchoTip) {
o.parentNode.removeChild(o.lazy_oTip);
o.lazy_isEchoTip = undefined;
}
};
return Lazyload;
}());
return Lazyload;
})));
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"file":"Lazyload.es6","sources":["_Blob.es6","_addEvent.es6","Lazyload.es6"],"sourcesContent":["export default (array,option)=>{\n    if(window.Blob){\n        return new Blob(array,option)\n    }else{\n        window.BlobBuilder = window.BlobBuilder || window.WebKitBlobBuilder || window.MozBlobBuilder || window.MSBlobBuilder;\n        if(window.BlobBuilder){\n            let bb = new BlobBuilder();\n            bb.append(array);\n            return bb.getBlob(typeof option === 'object' ? option.type : undefined);\n        };\n        return bb;\n    };\n};","export default (e,type,fn,mark)=>{\n    if(e.addEventListener){\n        e.addEventListener(type,fn,false);\n    }else if(e.attachEvent){\n        //e.detachEvent('on'+type,fn);\n        e.attachEvent('on'+type,()=>{\n            fn.call(e,window.event);\n        });\n    };\n};","import $Blob from './_Blob.es6';\nimport $addEvent from './_addEvent.es6';\n\nconst $URL = window.URL || window.webkitURL || window.mozURL || window.msURL;\n\nexport default class Lazyload {\n    constructor(obj) {\n        const _ts = this;\n        let config = _ts.config = {},\n            data = _ts.data = {},\n            o = _ts.obj = {\n                doc: document.documentElement,\n                body: document.body\n            },\n            blankImg = 'data:image/gif;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQImWNgYGBgAAAABQABh6FO1AAAAABJRU5ErkJggg==';\n\n        for (let i in obj) {\n            _ts.config[i] = obj[i];\n        };\n\n        //默认容差在100像\n        _ts.config['range'] = typeof _ts.config['range'] === 'numver' ? _ts.config['range'] : 100;\n\n        //图片方法扩展\n        _ts.imageExtend();\n\n        //图片数据处理\n        for (let i = 0, len = config.obj.length; i < len; i++) {\n            let item = config.obj[i],\n                dataSrc = item.lazy_dataSrc = item.getAttribute('data-src'),\n                dataCover = item.lazy_dataCover = item.getAttribute('data-cover');\n\n            if (item.src === '') {\n                item.src = blankImg;\n            };\n            item.removeAttribute('data-src');\n\n            //将获取的对象存储起来\n            if (data[dataSrc] === undefined) {\n                data[dataSrc] = [];\n            };\n            data[dataSrc].push(item);\n        };\n    }\n\n    init() {\n        const _ts = this,\n            config = _ts.config,\n            data = _ts.data,\n            o = _ts.obj,\n            task,\n            temp;\n\n        //图片更新执行\n        (task = () => {\n            //得到当前屏幕区域的需要更新图片列表\n            let eList = _ts.getShowList();\n\n            //遍历加载图片\n            for(let i=0,len=eList.length; i<len; i++){\n                let item = eList[i],\n                    key = item.lazy_dataSrc;\n                _ts.loadImg(item);\n            };\n        })();\n\n        let run = ()=>{\n            clearTimeout(temp);\n            temp = setTimeout(task, 200);\n        };\n\n        $addEvent(window,'scroll',run);\n        $addEvent(window,'resize',run);\n    }\n\n    /**\n     * 图片方法扩展\n     * \n     * @memberof Lazyload\n     */\n    imageExtend() {\n        const _ts = this;\n\n        Image.prototype.load = function (url, oL) {\n            let updateImg = (src) => {\n                //更新图片\n                for (let i = 0, len = oL.length; i < len; i++) {\n                    let item = oL[i];\n                    _ts.updateImg(item, src);\n                };\n            },\n            updateTips = (o) => {\n                //更新提示\n                for (let i = 0, len = oL.length; i < len; i++) {\n                    let item = oL[i];\n                    item.completedPercentage = o;\n                    o.o = item;\n                    _ts.tips(o);\n                };\n            };\n\n            if ($Blob && $URL && XMLHttpRequest) {\n                let img = this,\n                    xhr = new XMLHttpRequest();\n\n                xhr.open('GET', url, true);\n                xhr.responseType = 'arraybuffer';\n                xhr.onload = function (e) {\n                    let headers = xhr.getAllResponseHeaders(),\n                        m = headers.match(/^Content-Type\\:\\s*(.*?)$/mi),\n                        mimeType = m[1] || 'image/png',\n                        blob = $Blob([this.response], {\n                            type: mimeType\n                        }),\n                        src = $URL.createObjectURL(blob);\n                    updateImg(src);\n                };\n\n                xhr.onloadstart = xhr.onprogress = xhr.onloadend = function (e) {\n                    let o = {\n                        loaded: e.loaded,\n                        total: e.total,\n                        status: e.type,\n                        schedule: e.loaded === 0 ? 0 : e.loaded / e.total\n                    };\n                    updateTips(o);\n                };\n                xhr.send();\n            } else {\n                let o = {\n                        loaded: undefined,\n                        total: undefined,\n                        status: 'loaded',\n                        schedule: 0\n                    },\n                    temp;\n\n                temp = setInterval(() => {\n                    if (o.schedule > 0.98) {\n                        clearInterval(temp);\n                    };\n                    o.schedule = o.schedule + 0.01;\n                    o.status = 'progress';\n                    updateTips(o);\n                }, 100);\n                \n                this.onload = function () {\n                    clearInterval(temp);\n                    updateImg(this.src);\n                    o.status = 'loaded';\n                    o.schedule = 1;\n\n                    updateTips(o);\n                };\n            };\n        };\n    }\n\n    /**\n     * 获取浏览器窗口大小\n     * \n     * @returns {object} 容器宽高\n     * @memberof Lazyload\n     */\n    getWinSize() {\n        const _ts = this,\n            o = _ts.obj;\n        let o = {\n            w: window.innerWidth || o.doc.clientWidth,\n            h: window.innerHeight || o.doc.clientHeight\n        };\n        return o;\n    }\n\n    /**\n     * 获取页面滚动的像素\n     */\n    getWinScroll() {\n        const _ts = this,\n            o = _ts.obj;\n        let d = {\n            // x: window.scrollX || document.compatMode == \"BackCompat\" ? document.body.scrollLeft : document.documentElement.scrollLeft,\n            // y: window.scrollY || document.compatMode == \"BackCompat\" ? document.body.scrollTop : document.documentElement.scrollTop\n            x: window.scrollX || document.documentElement.scrollLeft || window.pageXOffset || document.body.scrollLeft,\n            y: window.scrollY || document.documentElement.scrollTop || window.pageYOffset || document.body.scrollTop\n        };\n\n        return d;\n    }\n\n    loadImg(o) {\n        const _ts = this,\n            data = _ts.data;\n\n        //已经加载过的则不处理\n        if (o.lazy_isInit) {\n            return;\n        };\n\n\n        let list = data[o.lazy_dataSrc];\n\n        // if(o.tagName === 'IMG'){\n        //     o.load(o.lazy_dataSrc,list);\n        // }else{\n        let img = new Image();\n        img.load(o.lazy_dataSrc, list);\n        img.src = o.lazy_dataSrc;\n\n        // if($Blob){\n        // img.load(o.lazy_dataSrc, list);\n        // }else{\n        //     //模拟加载\n        //     img.onload = function(){\n        //         for(let i=0,len=list.length; i<len; i++){\n        //             let item = list[i];\n        //             _ts.updateImg(item,src);\n        //         };\n        //     };\n        // };\n\n        // };\n\n\n        //更新图片地址相同的元素\n        for (let i = 0, len = list.length; i < len; i++) {\n            let item = list[i];\n            if (item.lazy_isInit) {\n                continue;\n            };\n            item.lazy_isInit = true;\n            if(item.lazy_dataCover){\n                _ts.updateImg(item, item.lazy_dataCover);\n            };\n        };\n    }\n\n    /**\n     * 更新图片\n     * \n     * @param {object} o 需要更新的元素\n     * @param {string} url 图片地址\n     * @memberof Lazyload\n     */\n    updateImg(o, url) {\n        if (o.tagName === 'IMG') {\n            o.src = url;\n        } else {\n            o.style.backgroundImage = `url(${url})`;\n        };\n    }\n\n    getElementTop(element) {\n        let actualTop = element.offsetTop,\n            current = element.offsetParent;\n\n        while (current !== null) {　　　　　　\n            actualTop += current.offsetTop;　　　　　　\n            current = current.offsetParent;　　　　\n        };　　　\n        return actualTop;\n    }\n\n    getElementLeft(element) {\n        let actualLeft = element.offsetLeft,\n            current = element.offsetParent;\n　　　\n        while (current !== null) {　　　　　　\n            actualLeft += current.offsetLeft;　　　　　　\n            current = current.offsetParent;　　　　\n        };\n        　　　　\n        return actualLeft;\n    }\n\n    /**\n     * 获取需要显示的元素\n     */\n    getShowList() {\n        const _ts = this,\n            config = _ts.config,\n            data = _ts.data;\n\n        let scroll = _ts.getWinScroll(),\n            winSize = _ts.getWinSize(),\n            temp = [];\n        //console.log(scroll,winSize)\n\n        for (let i = 0, len = config.obj.length; i < len; i++) {\n            let item = config.obj[i],\n                left = _ts.getElementLeft(item),\n                top = _ts.getElementTop(item),\n                width = item.clientWidth,\n                height = item.clientHeight,\n                xl = left + width - scroll.x > 0 - config.range, //页面左侧显示条件\n                xr = winSize.w + scroll.x + config.range > left, //页面右侧显示条件\n                yt = top + height - scroll.y > 0 - config.range, //页面顶部显示条件\n                yb = top < scroll.y + winSize.h + config.range, //页面底部显示条件\n                isInit = item.lazy_isInit;\n            //console.log(item,isInit,'left',left,'top',top,'width',width,'height',height);\n            \n            if (xl && xr && yt && yb && !isInit) {\n                temp.push(item);\n            };\n        };\n        return temp;\n    }\n\n    /**\n     * 默认的提示方法\n     * @param obj --\n     */\n    tips(obj) {\n        let schedule = parseInt(obj.schedule * 100) + '%',\n            o = obj.o;\n\n        if (o.lazy_isEchoTip === undefined) {\n            o.lazy_isEchoTip = true;\n            o.lazy_oTip = document.createElement('span');\n            o.lazy_oTip.className = 'lazy_tip';\n            o.parentNode.insertBefore(o.lazy_oTip, o.nextSibling);\n            //console.log(o.lazy_otip.parentNode)\n        };\n\n        o.lazy_oTip.innerHTML = schedule;\n\n        //当加载进度为1时，则移除对应的加载提示\n        if(obj.schedule === 1 && o.lazy_isEchoTip){\n            o.parentNode.removeChild(o.lazy_oTip);\n            o.lazy_isEchoTip = undefined;\n        };\n    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