新功能, 上传图片,无刷新.代码,Css代码库,德仔网

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【Css】新功能, 上传图片,无刷新.
作者:Dezai.CN / 发布于2013/2/1/ 559
?$ = function(id){if(typeof(id) == "string"){return document.getElementById(id);}else{return id;}}
//获取XMLHttpObject对象
function GetXmlHttpObject()
{
	var xmlHttp=null;
	try { xmlHttp=new XMLHttpRequest(); }
	catch (e) { try { xmlHttp=new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); } }
	return xmlHttp;
}

var XHRUpload = function(jsonMap){
	this.config = { url:null, name:null, element:null, size:3000000, formate:/./ }	//配置变量
	this.files = [];	//文件列表
	this.index = 0;		//文件索引
	this.mix(this.config, jsonMap);	//赋值.
	this.init(jsonMap);		//初使化
}
//prototype 返回对象原型...
XHRUpload.prototype = {
	//初使化
	init:function(jsonMap){
		var self = this;
		var element = jsonMap.element;
		element.addEventListener("dragenter", this._stopPrevent, false);
		element.addEventListener("dragover", this._stopPrevent, false);
		element.addEventListener("drop", function(e){ e.stopPropagation(); e.preventDefault(); self.start(e);	}, false);
	},
	//阻止浏览器默认动作 和事件冒泡
	_stopPrevent:function(e){ e.stopPropagation(); 	e.preventDefault(); }, 
	//赋值.给config赋值
	mix:function(a, b){ for(var i in b){ a[i] = b[i]; } return a; },
	//消息.处理
	onMsg:function(msg){},
	//开始上传
	start:function(e){
		// 拖拽可以在event.dataTransfer 中获取file对象
		if(e.dataTransfer.files.length == 0){return false};	//如果没有.返回false
		this.index--;
		this.files = this.files.concat( [].slice.call(e.dataTransfer.files) );
		this.next(); // 上传下一个			
	},
	//上传下一个文件
	next:function(){
		var self = this;
		if(self.files.length > ++self.index )
		{
			var file = self.files[self.index];
			self.onMsg('开始上传第 ' + (self.index+1) + ' 个文件!');	//记录消息.

			if(file.type.indexOf('image') != -1) 
			{
				var img_reader = new FileReader();
				img_reader.onload = (function (theFile) { return function (e) { 
					obj_ImgData = e.target.result; 
					create_Img({Name:'Img_'+self.index+1, Src:e.target.result, Title:theFile.name});
				}; })(file)
				img_reader.readAsDataURL(file);
			}
			
			self.reader(file, self.upload);
		}
	},
	//标准方法读取文件2进制数据.文件.上传函数
	reader:function(file, callBack){
		var self = this;
		if(!self.checkFormate(file))	//检测格式
		{
			//记录消息..
			self.onMsg('<span style="color:#FF0000">第 ' + (self.index+1) + ' 个文件 ' + file.fileName + ' 貌似不是图片文件的说.!</span>');
			self.next();
			return false;
		} 
		if (!self.checkFormsize(file))
		{
			var fsize = Math.floor((file.size/1024)/1024);
			self.onMsg('<span style="color:#FF0000">第 ' + (self.index+1) + ' 个文件 ' + file.fileName + ' 貌似有点大(' + fsize + ' M) 最大只能(2M).!</span>');
			self.next();
			return false;
		}
		var fileReader = new FileReader();
		fileReader.onloadend = function(){
			callBack.call(self, fileReader, file.fileName, file.FileSize);
		}
		fileReader.onerror = function(e)
		{
			self.onMsg('<span style="color:#FF0000">读取第 ' + (self.index+1) + ' 个文件时出错!</span>');	//记录消息.
			self.next();
		}
		fileReader.readAsBinaryString(file);// 开始读取2进制数据 异步 参数为file 对象
	},
	//清除上传队列中的文件
	remove:function(index){ return this.files.splice(index, 1); },
	//添加.
	add:function(file){ if(file instanceof File){	return this.files.push(file) } return false; },
	// 停止当前上传的文件
	abort:function(){ this.XHR.abort(); },
	//上传.
	upload:function(fileReader, fileName, fileSize)
	{
		console.log(fileReader)	//输出?
		var self = this;
		
		//var data = this.getBuild({fileName:fileName, binary:fileReader.result});	//获取数据.
		
		this.XHR = GetXmlHttpObject();
		this.XHR.onerror = function(msg){self.next(); self.onMsg(msg); };		//错误记录
		this.XHR.onuploadprogress = self.onMsg; 		//进度回调
		this.XHR.onreadystatechange = function()		//上传状态改变回调
		{
			var jd = (100/4)*(self.XHR.readyState);
			self.onMsg('当前已经上传了: '+jd+'%');
			if (self.XHR.readyState == 4 || self.XHR.readyState == "complete")
			{
				var rCon = self.XHR.responseText;
				if(rCon == '上传失败!' || rCon == '')
				{
					self.onMsg('<span style="color:#F00">第 ' + (self.index+1) + ' 个文件' + fileName + ' 上传失败!</span>');
					$('Img_'+self.index+1).style.border = '3px solid #FF0000';
				}
				else
				{
					self.onMsg('<span style="color:#0F0">第 ' + (self.index+1) + ' 个文件' + fileName + ' ' + rCon + '.</span>');
					$('Img_'+self.index+1).style.border = '1px solid #0F0';
				}
				self.next();		//下一个
			}
		};
		this.XHR.open("POST", this.config.url, true);
		
		//this.XHR.setRequestHeader("Content-type", "multipart/form-data; boundary=" + data.boundary);	//火狐下有交接.chrome无效
		//this.XHR.overrideMimeType("text/plain; charset=x-user-defined-binary");	

		this.XHR.setRequestHeader("Content-type","application/x-www-form-urlencoded");
		
		if(this.XHR.sendAsBinary)
		{
			console.log("this.XHR.sendAsBinary");
			//this.XHR.sendAsBinary(data.builder);	//FF上传方式
			this.XHR.sendAsBinary('chromeFile=' + encodeURIComponent(obj_ImgData));
		}
		else
		{
			console.log("send");
			//this.XHR.send(data.builder);
			this.XHR.send('chromeFile=' + encodeURIComponent(obj_ImgData));
		}
	},
	//获取上传数据
	getBuild:function(o){
		var boundary = '-----------------' + (new Date).getTime();
		var dashdash = '--';
		var crlf     = '\r\n';
		var builder = '';
		builder += dashdash+boundary+crlf;
		builder += 'Content-Disposition: form-data; name="'+ this.config.name +'"; filename="' + encodeURIComponent(o.fileName) + '"'+ crlf;
		builder += 'Content-Type: application/octet-stream'+ crlf + crlf; 
		/* 二进制数据 */
		builder += o.binary + crlf;
		builder += dashdash + boundary + dashdash + crlf;
		
		return { boundary : boundary, builder : builder };
	},
	//验证用户拖入的文件类型
	checkFormate:function(file){ return this.config.formate.test(file.fileName) },
	//验证文件大小
	checkFormsize:function(file){ return (this.config.size > file.size) },
}
var obj_ImgData = '';			//图片变量
//创建图片对象.并显示
var create_Img = function(img)
{
	var obj_img = document.createElement("img");
	obj_img.id = img.Name || 'obj_Img';
	obj_img.style.margin = '5px';
	obj_img.style.maxWidth = '100px';
	obj_img.style.maxHeight = '100px';
	obj_img.style.cursor = 'pointer';
	obj_img.style.border = '2px solid #FFCC00';
	obj_img.title = img.Title || 'Image';
	
	obj_img.src = img.src || obj_ImgData;
	obj_img.onclick = function(){window.open(obj_img.src);};
	
	$('div_img').appendChild(obj_img);
		
}
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