asp.net javascript 文件無(wú)刷新上傳實(shí)例代碼第1/2頁(yè)

2020-01-18 01:15:04

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供稿：網(wǎng)友

在新增數(shù)據(jù)項(xiàng)的時(shí)候，用ajax實(shí)現(xiàn)無(wú)刷新提交，但上傳文件的時(shí)候，由于數(shù)據(jù)類(lèi)型原因，不能將頁(yè)面的<asp:FileUpload>中以字符串值的方式傳到j(luò)s里調(diào)用。我一共找到了兩個(gè)方法予以解決，實(shí)現(xiàn)無(wú)刷新上傳。
第一種方法：利用js的ADODB.Stream，將文件先轉(zhuǎn)換成流，再通過(guò)js上傳到服務(wù)器，這樣有個(gè)好處就是可以上傳超大文件，并且由于是數(shù)據(jù)流，可以支持?jǐn)帱c(diǎn)續(xù)傳、方便顯示上傳進(jìn)度等人性化功能。唯一的缺點(diǎn)是要客戶(hù)端瀏覽器需要設(shè)置安全級(jí)別，或者安裝相關(guān)ActiveX控件（這個(gè)控件自己做的，加載到頁(yè)面中）。
相關(guān)代碼：
文件有：1個(gè)前臺(tái)頁(yè)面：upload.html、 1個(gè)js控制：upload.js、 1個(gè)后臺(tái)處理頁(yè)面：Accept.aspx(Accept.aspx.cs)
代碼文件如下：
upload.html

復(fù)制代碼代碼如下:

 
<html xmlns="http://www.w3.org/1999/xhtml" > 
<head runat="server"> 
<title>無(wú)標(biāo)題頁(yè)</title> 
<script src="upload.js" src="upload.js" language="jscript" type="text/jscript"></script> 
</head> 
<body> 
<form id="form1" runat="server"> 
<div style="width:100%"> 
<input type="file" id="hidFilePath" /> 
<input type="button" id="ok" onclick="BeginUpLoadFile('0', true)" title="上傳" value="UpLoad"/> 
</div> 
<div id="lblLeavingsTime">TIME</div> 
<div id="returnInfo">Info</div> 
</form> 
</body> 
</html> 

upload.js

復(fù)制代碼代碼如下:

 
var g_XMLHttp = null; 
var g_Stream = new ActiveXObject('ADODB.Stream'); 
var g_SendCount = 0; 
var g_TotalCount = 0; 
var g_FileSize = 0; 
var g_UpFileType = 0 ; 
var g_BlockSize = 1024 * 100; //每段分為100K 
var fileExtName = "" ; //文件后綴名 
var g_PauseFlag = false; 
var g_BeginTime = null; 
var g_guageFlag = false ; 
var Nfilename = "" ; 
function Init() 
{ 
InitTitleEvent(); 
BeginUpLoadFile(); 
} 
function MoveGuage() 
{ 
var t_Time = new Date(); 
var t_OddTime = Math.ceil((t_Time.getTime() - g_BeginTime.getTime()) / g_SendCount * (g_TotalCount - g_SendCount) / 1000); 
var t_OddTimeString = ''; 
if(t_OddTime >= 3600) 
{ 
t_OddTimeString = Math.floor(t_OddTime / 3600) + '時(shí)'; 
t_OddTime %= 3600; 
} 
if(t_OddTime >= 60) 
{ 
t_OddTimeString += Math.floor(t_OddTime / 60) + '分'; 
t_OddTime %= 60; 
} 
document.all.lblLeavingsTime.innerText = t_OddTimeString + t_OddTime + '秒'; 
} 
//第1個(gè)參數(shù)表示上傳的類(lèi)型，為命名新文件提供參考 
//第2個(gè)參數(shù)表示要不要顯示狀態(tài)條 
function BeginUpLoadFile(upFileType, guageFlag) 
{ 
if(g_Stream == null) 
{alert("您的機(jī)器不支持ADODB.Stream."); } 
else 
{ 
g_guageFlag = guageFlag ; 
g_UpFileType = upFileType; 
g_Stream.Type = 1; 
g_Stream.Open(); 
var pth = document.getElementById("hidFilePath").value ; 
g_Stream.LoadFromFile(pth); 
var fname=pth.split('//'); 
Nfilename = fname[fname.length-1] ; 
fileExtName = Nfilename.split('.')[1].toLowerCase(); 
g_Stream.position = 0; 
g_SendCount = 1; 
g_FileSize = g_Stream.size ; 
if (upFileType == 0) //上傳圖片 
{ 
if (g_FileSize > 1024 * 1024 * 2 ) // 不能大于2M 
{ 
document.all.returnInfo.innerText = "文件大小超過(guò)2M！" ; 
g_PauseFlag = true; 
return ; 
} 
var str = "bmp,jpg,jpeg,gif,png,icon"; 
if (str.search(fileExtName) == -1) //圖片格式不能超出范圍 
{ 
document.all.returnInfo.innerText = "文件格式不正確，請(qǐng)選擇bmp、jpg、jpeg、gif、png、icon格式圖片！" ; 
g_PauseFlag = true; 
return ; 
} 
} 
g_TotalCount = Math.ceil(g_Stream.size / g_BlockSize); 
g_BeginTime = new Date(); 
SendData(); 
} 
} 
function SendData() 
{ 
if(g_PauseFlag) 
{ 
return; 
} 
if(g_SendCount <= g_TotalCount) 
{ 
var t_XMLDOM = null; 
var t_Root = null; 
var t_Node = null; 
var t_Attribute = null; 
t_XMLDOM = new ActiveXObject('Microsoft.XMLDOM'); 
t_XMLDOM.async = false; 
t_XMLDOM.resolveExternals = false; 
t_Node = t_XMLDOM.createProcessingInstruction('xml','version="1.0"'); 
t_XMLDOM.appendChild(t_Node); 
t_Root = t_XMLDOM.createElement('Root'); 
t_XMLDOM.appendChild(t_Root); 
t_XMLDOM.documentElement.setAttribute('xmlns:dt','urn:schemas-microsoft-com:datatypes'); 
t_Node = t_XMLDOM.createElement('Data'); 
t_Node.dataType = 'bin.base64'; 
t_Node.nodeTypedValue = g_Stream.Read(g_BlockSize); 
t_Attribute = t_XMLDOM.createAttribute('upfiletype'); 
t_Attribute.value = g_UpFileType; 
t_Node.setAttributeNode(t_Attribute); 
t_Attribute = t_XMLDOM.createAttribute('fileindex'); 
t_Attribute.value = g_SendCount; 
t_Node.setAttributeNode(t_Attribute); 
t_Attribute = t_XMLDOM.createAttribute('totalcount'); 
t_Attribute.value = g_TotalCount; 
t_Node.setAttributeNode(t_Attribute); 
t_Attribute = t_XMLDOM.createAttribute('filesize'); 
t_Attribute.value = g_FileSize; 
t_Node.setAttributeNode(t_Attribute); 
t_Attribute = t_XMLDOM.createAttribute('blocksize'); 
t_Attribute.value = g_BlockSize; 
t_Node.setAttributeNode(t_Attribute); 
t_Attribute = t_XMLDOM.createAttribute('fileextname'); 
t_Attribute.value = fileExtName; 
t_Node.setAttributeNode(t_Attribute); 
t_Root.appendChild(t_Node); 
g_XMLHttp = new ActiveXObject('Microsoft.XMLHttp'); 
g_XMLHttp.open('POST','AcceptFile.aspx',true); 
g_XMLHttp.onreadystatechange = XMLHttpStateChange; 
g_XMLHttp.send(t_XMLDOM); 
if (g_guageFlag){ MoveGuage(); } 
} 
else 
{ 
var xx = spider.BookFile.FileObj.getFileName() ; 
alert(xx.value) ; 
document.all.lblLeavingsTime.innerText = '0秒'; 
CloseWindow(document.all.cmdClose); 
document.all.returnInfo.innerText = '文件上傳完成！'; 
} 
} 
function XMLHttpStateChange() 
{ 
if(g_XMLHttp.readyState == 4) 
{ 
var rstr = g_XMLHttp.responseText ; 
if(rstr == 'OK') 
{ 
g_SendCount++; 
SendData(); 
} 
else 
{ 
document.all.returnInfo.innerText = rstr; 
CloseWindow(document.all.cmdClose); 
} 
} 
} 
function CloseWindow(p_OBJ) 
{ 
g_PauseFlag = true; 
g_Stream.Close(); 
} 

Accept.aspx

復(fù)制代碼代碼如下:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AcceptFile.aspx.cs" Inherits="commonJS_AcceptFile" %> 

Accept.aspx.cs

復(fù)制代碼代碼如下:

using System; 
using System.Data; 
using System.Configuration; 
using System.Collections; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 
using System.Xml; 
using System.IO; 
using spider.BookFile; //這是自己寫(xiě)的文件類(lèi) 
public partial class commonJS_AcceptFile : System.Web.UI.Page 
{ 
protected void Page_Load(object sender, EventArgs e) 
{ 
AjaxPro.Utility.RegisterTypeForAjax(typeof(FileObj)); 
XmlDocument t_XmlDocument = new XmlDocument(); 
t_XmlDocument.Load(this.Request.InputStream); 
XmlNode t_XmlNode = t_XmlDocument.SelectSingleNode("Root/Data"); 
FileObj t_FileOBJ = new FileObj(); 
string t_upfiletype = t_XmlNode.Attributes["upfiletype"].Value; 
string t_FileIndex = t_XmlNode.Attributes["fileindex"].Value; 
string t_totalcount = t_XmlNode.Attributes["totalcount"].Value; 
string t_filesize = t_XmlNode.Attributes["filesize"].Value; 
string t_blocksize = t_XmlNode.Attributes["blocksize"].Value; 
string t_fileextname = t_XmlNode.Attributes["fileextname"].Value; 
byte[] t_File = Convert.FromBase64String(t_XmlNode.FirstChild.Value); 
FileObj.upfile myUpFile = new FileObj.upfile(); 
myUpFile.FileCount = t_totalcount; 
myUpFile.FileIndex = t_FileIndex; 
myUpFile.UpFileType = t_upfiletype; 
myUpFile.FileSize = t_filesize; 
myUpFile.BlockSize = t_blocksize; 
myUpFile.ExtName = t_fileextname; 
myUpFile.t_File = t_File; 
FileObj.InsertFileList(myUpFile); 
if (FileObj.getErrMsg == "") 
{ 
this.Response.Write("OK"); 
} 
else 
{ 
this.Response.Write(FileObj.getErrMsg); 
} 
} 
} 