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/*!
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* upload 文件上传组件
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* MIT Licensed
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*/
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layui.define('layer' , function(exports){
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"use strict";
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var $ = layui.$
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,layer = layui.layer
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,hint = layui.hint()
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,device = layui.device()
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//外部接口
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,upload = {
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config: {} //全局配置项
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//设置全局项
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,set: function(options){
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var that = this;
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that.config = $.extend({}, that.config, options);
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return that;
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}
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//事件
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,on: function(events, callback){
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return layui.onevent.call(this, MOD_NAME, events, callback);
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}
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}
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//操作当前实例
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,thisUpload = function(){
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var that = this;
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return {
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upload: function(files){
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that.upload.call(that, files);
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}
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,reload: function(options){
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that.reload.call(that, options);
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}
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,config: that.config
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}
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}
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//字符常量
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,MOD_NAME = 'upload', ELEM = 'layui-upload', THIS = 'layui-this', SHOW = 'layui-show', HIDE = 'layui-hide', DISABLED = 'layui-disabled'
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,ELEM_FILE = 'layui-upload-file', ELEM_FORM = 'layui-upload-form', ELEM_IFRAME = 'layui-upload-iframe', ELEM_CHOOSE = 'layui-upload-choose', ELEM_DRAG = 'layui-upload-drag'
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//构造器
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,Class = function(options){
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var that = this;
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that.config = $.extend({}, that.config, upload.config, options);
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that.render();
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};
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//默认配置
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Class.prototype.config = {
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accept: 'images' //允许上传的文件类型：images/file/video/audio
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,exts: '' //允许上传的文件后缀名
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,auto: true //是否选完文件后自动上传
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,bindAction: '' //手动上传触发的元素
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,url: '' //上传地址
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,field: 'file' //文件字段名
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,acceptMime: '' //筛选出的文件类型，默认为所有文件
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,method: 'post' //请求上传的 http 类型
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,data: {} //请求上传的额外参数
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,drag: true //是否允许拖拽上传
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,size: 0 //文件限制大小，默认不限制
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,number: 0 //允许同时上传的文件数，默认不限制
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,multiple: false //是否允许多文件上传，不支持ie8-9
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};
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//初始渲染
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Class.prototype.render = function(options){
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var that = this
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,options = that.config;
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options.elem = $(options.elem);
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options.bindAction = $(options.bindAction);
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that.file();
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that.events();
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};
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//追加文件域
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Class.prototype.file = function(){
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var that = this
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,options = that.config
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,elemFile = that.elemFile = $([
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'<input class="'+ ELEM_FILE +'" type="file" accept="'+ options.acceptMime +'" name="'+ options.field +'"'
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,(options.multiple ? ' multiple' : '')
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,'>'
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].join(''))
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,next = options.elem.next();
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if(next.hasClass(ELEM_FILE) || next.hasClass(ELEM_FORM)){
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next.remove();
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}
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//包裹ie8/9容器
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if(device.ie && device.ie < 10){
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options.elem.wrap('<div class="layui-upload-wrap"></div>');
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}
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that.isFile() ? (
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that.elemFile = options.elem
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,options.field = options.elem[0].name
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) : options.elem.after(elemFile);
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//初始化ie8/9的Form域
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if(device.ie && device.ie < 10){
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that.initIE();
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}
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};
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//ie8-9初始化
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Class.prototype.initIE = function(){
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var that = this
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,options = that.config
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,iframe = $('<iframe id="'+ ELEM_IFRAME +'" class="'+ ELEM_IFRAME +'" name="'+ ELEM_IFRAME +'" frameborder="0"></iframe>')
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,elemForm = $(['<form target="'+ ELEM_IFRAME +'" class="'+ ELEM_FORM +'" method="post" key="set-mine" enctype="multipart/form-data" action="'+ options.url +'">'
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,'</form>'].join(''));
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//插入iframe
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$('#'+ ELEM_IFRAME)[0] || $('body').append(iframe);
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//包裹文件域
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if(!options.elem.next().hasClass(ELEM_FORM)){
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that.elemFile.wrap(elemForm);
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//追加额外的参数
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options.elem.next('.'+ ELEM_FORM).append(function(){
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var arr = [];
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layui.each(options.data, function(key, value){
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value = typeof value === 'function' ? value() : value;
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arr.push('<input type="hidden" name="'+ key +'" value="'+ value +'">')
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});
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return arr.join('');
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}());
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}
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};
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//异常提示
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Class.prototype.msg = function(content){
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return layer.msg(content, {
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icon: 2
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,shift: 6
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});
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};
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//判断绑定元素是否为文件域本身
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Class.prototype.isFile = function(){
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var elem = this.config.elem[0];
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if(!elem) return;
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return elem.tagName.toLocaleLowerCase() === 'input' && elem.type === 'file'
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}
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//预读图片信息
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Class.prototype.preview = function(callback){
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var that = this;
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if(window.FileReader){
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layui.each(that.chooseFiles, function(index, file){
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var reader = new FileReader();
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reader.readAsDataURL(file);
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reader.onload = function(){
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callback && callback(index, file, this.result);
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}
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});
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}
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};
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//执行上传
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Class.prototype.upload = function(files, type){
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var that = this
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,options = that.config
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,elemFile = that.elemFile[0]
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//高级浏览器处理方式，支持跨域
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,ajaxSend = function(){
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var successful = 0, aborted = 0
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,items = files || that.files || that.chooseFiles || elemFile.files
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,allDone = function(){ //多文件全部上传完毕的回调
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if(options.multiple && successful + aborted === that.fileLength){
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typeof options.allDone === 'function' && options.allDone({
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total: that.fileLength
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,successful: successful
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,aborted: aborted
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});
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}
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};
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layui.each(items, function(index, file){
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var formData = new FormData();
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formData.append(options.field, file);
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//追加额外的参数
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layui.each(options.data, function(key, value){
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value = typeof value === 'function' ? value() : value;
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formData.append(key, value);
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});
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//提交文件
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var opts = {
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url: options.url
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,type: 'post' //统一采用 post 上传
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,data: formData
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,contentType: false
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,processData: false
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,dataType: 'json'
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,headers: options.headers || {}
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//成功回调
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,success: function(res){
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successful++;
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done(index, res);
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allDone();
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}
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//异常回调
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,error: function(){
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aborted++;
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that.msg('请求上传接口出现异常');
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error(index);
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allDone();
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}
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};
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//进度条
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if(typeof options.progress === 'function'){
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opts.xhr = function(){
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var xhr = $.ajaxSettings.xhr();
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//上传进度
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xhr.upload.addEventListener("progress", function (obj) {
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if(obj.lengthComputable){
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var percent = Math.floor((obj.loaded/obj.total)* 100); //百分比
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options.progress(percent, (options.item ? options.item[0] : options.elem[0]) , obj, index);
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}
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});
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return xhr;
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}
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}
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$.ajax(opts);
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});
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}
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//低版本IE处理方式，不支持跨域
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,iframeSend = function(){
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var iframe = $('#'+ ELEM_IFRAME);
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that.elemFile.parent().submit();
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//获取响应信息
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clearInterval(Class.timer);
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Class.timer = setInterval(function() {
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var res, iframeBody = iframe.contents().find('body');
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try {
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res = iframeBody.text();
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} catch(e) {
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that.msg('获取上传后的响应信息出现异常');
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clearInterval(Class.timer);
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error();
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}
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if(res){
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clearInterval(Class.timer);
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iframeBody.html('');
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done(0, res);
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}
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}, 30);
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}
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//统一回调
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,done = function(index, res){
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that.elemFile.next('.'+ ELEM_CHOOSE).remove();
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elemFile.value = '';
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if(typeof res !== 'object'){
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try {
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res = JSON.parse(res);
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} catch(e){
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res = {};
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return that.msg('请对上传接口返回有效JSON');
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}
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}
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typeof options.done === 'function' && options.done(res, index || 0, function(files){
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that.upload(files);
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});
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}
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//统一网络异常回调
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,error = function(index){
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if(options.auto){
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elemFile.value = '';
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}
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typeof options.error === 'function' && options.error(index || 0, function(files){
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that.upload(files);
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});
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}
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,exts = options.exts
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,check ,value = function(){
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var arr = [];
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layui.each(files || that.chooseFiles, function(i, item){
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arr.push(item.name);
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});
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return arr;
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}()
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//回调返回的参数
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,args = {
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//预览
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preview: function(callback){
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that.preview(callback);
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}
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//上传
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,upload: function(index, file){
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var thisFile = {};
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thisFile[index] = file;
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that.upload(thisFile);
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}
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//追加文件到队列
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,pushFile: function(){
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that.files = that.files || {};
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layui.each(that.chooseFiles, function(index, item){
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that.files[index] = item;
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});
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return that.files;
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}
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//重置文件
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,resetFile: function(index, file, filename){
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var newFile = new File([file], filename);
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that.files = that.files || {};
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that.files[index] = newFile;
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}
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}
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//提交上传
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,send = function(){
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//选择文件的回调
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if(type === 'choose' || options.auto){
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options.choose && options.choose(args);
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if(type === 'choose'){
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return;
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}
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}
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//上传前的回调 - 如果回调函数明确返回false，则停止上传(#pulls55)
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if(options.before && (options.before(args) === false)) return;
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//IE兼容处理
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if(device.ie){
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return device.ie > 9 ? ajaxSend() : iframeSend();
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}
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ajaxSend();
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}
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//校验文件格式
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value = value.length === 0
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? ((elemFile.value.match(/[^\/\\]+\..+/g)||[]) || '')
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: value;
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if(value.length === 0) return;
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switch(options.accept){
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case 'file': //一般文件
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if(exts && !RegExp('\\w\\.('+ exts +')$', 'i').test(escape(value))){
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that.msg('选择的文件中包含不支持的格式');
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return elemFile.value = '';
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}
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break;
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case 'video': //视频文件
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if(!RegExp('\\w\\.('+ (exts || 'avi|mp4|wma|rmvb|rm|flash|3gp|flv') +')$', 'i').test(escape(value))){
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that.msg('选择的视频中包含不支持的格式');
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return elemFile.value = '';
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}
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break;
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case 'audio': //音频文件
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if(!RegExp('\\w\\.('+ (exts || 'mp3|wav|mid') +')$', 'i').test(escape(value))){
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that.msg('选择的音频中包含不支持的格式');
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return elemFile.value = '';
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}
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break;
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default: //图片文件
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layui.each(value, function(i, item){
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if(!RegExp('\\w\\.('+ (exts || 'jpg|png|gif|bmp|jpeg$') +')', 'i').test(escape(item))){
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check = true;
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}
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});
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if(check){
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that.msg('选择的图片中包含不支持的格式');
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return elemFile.value = '';
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}
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break;
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}
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//检验文件数量
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that.fileLength = function(){
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var length = 0
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,items = files || that.files || that.chooseFiles || elemFile.files;
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layui.each(items, function(){
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length++;
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});
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return length;
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}();
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if(options.number && that.fileLength > options.number){
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return that.msg('同时最多只能上传的数量为：'+ options.number);
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}
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//检验文件大小
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if(options.size > 0 && !(device.ie && device.ie < 10)){
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var limitSize;
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layui.each(that.chooseFiles, function(index, file){
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if(file.size > 1024*options.size){
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var size = options.size/1024;
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size = size >= 1 ? (size.toFixed(2) + 'MB') : options.size + 'KB'
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elemFile.value = '';
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limitSize = size;
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}
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});
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if(limitSize) return that.msg('文件不能超过'+ limitSize);
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}
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send();
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};
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//重置方法
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Class.prototype.reload = function(options){
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options = options || {};
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delete options.elem;
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delete options.bindAction;
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var that = this
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,options = that.config = $.extend({}, that.config, upload.config, options)
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,next = options.elem.next();
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//更新文件域相关属性
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next.attr({
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name: options.name
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,accept: options.acceptMime
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,multiple: options.multiple
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});
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};
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//事件处理
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Class.prototype.events = function(){
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var that = this
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,options = that.config
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//设置当前选择的文件队列
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,setChooseFile = function(files){
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that.chooseFiles = {};
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layui.each(files, function(i, item){
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var time = new Date().getTime();
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that.chooseFiles[time + '-' + i] = item;
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});
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}
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//设置选择的文本
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,setChooseText = function(files, filename){
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var elemFile = that.elemFile
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,item = options.item ? options.item : options.elem
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,value = files.length > 1
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? files.length + '个文件'
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: ((files[0] || {}).name || (elemFile[0].value.match(/[^\/\\]+\..+/g)||[]) || '');
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if(elemFile.next().hasClass(ELEM_CHOOSE)){
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elemFile.next().remove();
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}
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that.upload(null, 'choose');
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if(that.isFile() || options.choose) return;
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elemFile.after('<span class="layui-inline '+ ELEM_CHOOSE +'">'+ value +'</span>');
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};
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//点击上传容器
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options.elem.off('upload.start').on('upload.start', function(){
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var othis = $(this), data = othis.attr('lay-data');
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if(data){
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try{
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data = new Function('return '+ data)();
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that.config = $.extend({}, options, data);
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} catch(e){
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hint.error('Upload element property lay-data configuration item has a syntax error: ' + data)
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}
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}
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that.config.item = othis;
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that.elemFile[0].click();
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});
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//拖拽上传
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if(!(device.ie && device.ie < 10)){
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options.elem.off('upload.over').on('upload.over', function(){
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var othis = $(this)
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othis.attr('lay-over', '');
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})
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.off('upload.leave').on('upload.leave', function(){
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var othis = $(this)
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othis.removeAttr('lay-over');
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})
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.off('upload.drop').on('upload.drop', function(e, param){
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var othis = $(this), files = param.originalEvent.dataTransfer.files || [];
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othis.removeAttr('lay-over');
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setChooseFile(files);
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if(options.auto){
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that.upload(files);
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} else {
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setChooseText(files);
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}
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});
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}
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//文件选择
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that.elemFile.off('upload.change').on('upload.change', function(){
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var files = this.files || [];
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setChooseFile(files);
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options.auto ? that.upload() : setChooseText(files); //是否自动触发上传
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});
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//手动触发上传
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options.bindAction.off('upload.action').on('upload.action', function(){
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that.upload();
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});
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//防止事件重复绑定
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if(options.elem.data('haveEvents')) return;
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that.elemFile.on('change', function(){
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$(this).trigger('upload.change');
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});
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options.elem.on('click', function(){
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if(that.isFile()) return;
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$(this).trigger('upload.start');
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});
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if(options.drag){
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options.elem.on('dragover', function(e){
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e.preventDefault();
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$(this).trigger('upload.over');
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}).on('dragleave', function(e){
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$(this).trigger('upload.leave');
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}).on('drop', function(e){
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e.preventDefault();
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$(this).trigger('upload.drop', e);
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});
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}
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options.bindAction.on('click', function(){
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$(this).trigger('upload.action');
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});
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options.elem.data('haveEvents', true);
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};
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//核心入口
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upload.render = function(options){
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var inst = new Class(options);
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return thisUpload.call(inst);
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};
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exports(MOD_NAME, upload);
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});
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