在新增数据项的时候，用ajax实现无刷新提交，但上传文件的时候，由于数据类型原因，不能将页面的<asp:FileUpload>中以字符串值的方式传到js里调用。我一共找到了两个方法予以解决，实现无刷新上传。 第一种方法：利用js的ADODB.Stream，将文件先转换成流，再通过js上传到服务器，这样有个好处就是可以上传超大文件，并且由于是数据流，可以支持断点续传、方便显示上传进度等人性化功能。唯一的缺点是要客户端浏览器需要设置安全级别，或者安装相关ActiveX控件（这个控件自己做的，加载到页面中）。 相关代码： 文件有：1个前台页面：upload.html、 1个js控制：upload.js、 1个后台处理页面：Accept.aspx(Accept.aspx.cs) 代码文件如下： upload.html view plaincopy to clipboardprint?<html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>无标题页</title> <mce:script src="upload.js" mce_src="upload.js" language="jscript" type="text/jscript"></mce:script> </head> <body> <form id="form1" runat="server"> <div style="width:100%"> <input type="file" id="hidFilePath" /> <input type="button" id="ok" οnclick="BeginUpLoadFile('0', true)" title="上传" value="UpLoad"/> </div> <div id="lblLeavingsTime">TIME</div> <div id="returnInfo">Info</div> </form> </body> </html> <html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>无标题页</title> <mce:script src="upload.js" mce_src="upload.js" language="jscript" type="text/jscript"></mce:script></head><body> <form id="form1" runat="server"> <div style="width:100%"> <input type="file" id="hidFilePath" /> <input type="button" id="ok" οnclick="BeginUpLoadFile('0', true)" title="上传" value="UpLoad"/> </div> <div id="lblLeavingsTime">TIME</div> <div id="returnInfo">Info</div> </form></body></html> upload.js view plaincopy to clipboardprint?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; //每段分为100K var fileExtName = "" ; //文件后缀名 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) + '时'; 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个参数表示上传的类型，为命名新文件提供参考 //第2个参数表示要不要显示状态条 function BeginUpLoadFile(upFileType, guageFlag) { if(g_Stream == null) {alert("您的机器不支持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) //上传图片 { if (g_FileSize > 1024 * 1024 * 2 ) // 不能大于2M { document.all.returnInfo.innerText = "文件大小超过2M！" ; g_PauseFlag = true; return ; } var str = "bmp,jpg,jpeg,gif,png,icon"; if (str.search(fileExtName) == -1) //图片格式不能超出范围 { document.all.returnInfo.innerText = "文件格式不正确，请选择bmp、jpg、jpeg、gif、png、icon格式图片！" ; 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 = '文件上传完成！'; } } 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(); } 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; //每段分为100Kvar fileExtName = "" ; //文件后缀名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) + '时';
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个参数表示上传的类型，为命名新文件提供参考//第2个参数表示要不要显示状态条function BeginUpLoadFile(upFileType, guageFlag){ if(g_Stream == null) {alert("您的机器不支持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) //上传图片 { if (g_FileSize > 1024 * 1024 * 2 ) // 不能大于2M { document.all.returnInfo.innerText = "文件大小超过2M！" ; g_PauseFlag = true; return ; } var str = "bmp,jpg,jpeg,gif,png,icon"; if (str.search(fileExtName) == -1) //图片格式不能超出范围 { document.all.returnInfo.innerText = "文件格式不正确，请选择bmp、jpg、jpeg、gif、png、icon格式图片！" ; 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 = '文件上传完成！'; }
}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 view plaincopy to clipboardprint?<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AcceptFile.aspx.cs" Inherits="commonJS_AcceptFile" %> <%@ Page Language="C#" AutoEventWireup="true" CodeFile="AcceptFile.aspx.cs" Inherits="commonJS_AcceptFile" %> Accept.aspx.cs view plaincopy to clipboardprint?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; //这是自己写的文件类 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); } } } 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; //这是自己写的文件类
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); }
}}第二种方法：用js动态创建form和iframe上传文件，实现无刷新。优点是代码量小，无需客户端安装控件，缺点就是上传有限制大小，下面看代码： 需要文件有：1个前台页面upload.html、 1个js函数 function upFile、 1个处理文件accept.aspx(accept.aspx.cs) upload.html view plaincopy to clipboardprint?<html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>无标题页</title> <mce:script src="upload.js" mce_src="upload.js" language="jscript" type="text/jscript"></mce:script> </head> <body> <form id="form1" runat="server"> <div style="width:100%"> <iframe name='hidden_frame' id="hidden_frame" style='width:150px; height:50px; display:none;'> </iframe> <input type="file" id="hidFilePath" /> <input id="upBtn" type="button" class="clearBtn" style="display:none;" value="上传图片" οnclick="upFile('hidFilePath');" /> </div> </form> </body> </html> <html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>无标题页</title> <mce:script src="upload.js" mce_src="upload.js" language="jscript" type="text/jscript"></mce:script></head><body> <form id="form1" runat="server"> <div style="width:100%"> <iframe name='hidden_frame' id="hidden_frame" style='width:150px; height:50px; display:none;'> </iframe> <input type="file" id="hidFilePath" /> <input id="upBtn" type="button" class="clearBtn" style="display:none;" value="上传图片" οnclick="upFile('hidFilePath');" /> </div> </form></body></html>function upFile view plaincopy to clipboardprint?function upFile(ob) { var file = document.getElementById(ob) ; var newName = "FileName"; //设置文件保存的名字 var form=document.createElement('form'); document.body.appendChild(form); form.encoding="multipart/form-data"; form.method = "post"; form.action= "accept.aspx?nm=" + newName; form.target= "hidden_frame"; var pos=file.nextSibling; //记住file在旧表单中的的位置 form.appendChild(file); form.submit(); pos.parentNode.insertBefore(file,pos); document.body.removeChild(form); } function upFile(ob){ var file = document.getElementById(ob) ; var newName = "FileName"; //设置文件保存的名字 var form=document.createElement('form'); document.body.appendChild(form); form.encoding="multipart/form-data"; form.method = "post"; form.action= "accept.aspx?nm=" + newName; form.target= "hidden_frame"; var pos=file.nextSibling; //记住file在旧表单中的的位置 form.appendChild(file); form.submit(); pos.parentNode.insertBefore(file,pos); document.body.removeChild(form);}accept.aspx view plaincopy to clipboardprint?<%@ Page Language="C#" AutoEventWireup="true" CodeFile="up.aspx.cs" Inherits="Member_up" %> <%@ Page Language="C#" AutoEventWireup="true" CodeFile="up.aspx.cs" Inherits="Member_up" %> accept.aspx.cs view plaincopy to clipboardprint?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; public partial class Member_up : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { string mz = HttpContext.Current.Request.QueryString["nm"].ToString(); string uperr = ""; HttpFileCollection files = HttpContext.Current.Request.Files; if (files.Count>0) { uperr = upSingleFile(files[0], mz); } else { uperr = "ok"; } HttpContext.Current.Session["upInfo"] = uperr; Response.Write(uperr); } //上传文件 private string upSingleFile(HttpPostedFile file, String theFileName) { string infos = ""; bool fileOK = false; string fileName, fileExtension ; fileName = System.IO.Path.GetFileName(file.FileName); if (fileName != "") { if (file.ContentLength >= 1024 * 1024 * 2) { infos = "上传文件太大，目前仅支持2M以内的图片上传！"; } else { fileExtension = System.IO.Path.GetExtension(fileName).ToLower(); String[] allowedExtensions = { ".jpg", ".jpeg", ".gif", ".bmp", ".png", ".icon" }; for (int i = 0; i < allowedExtensions.Length; i++) { if (fileExtension == allowedExtensions[i]) { fileOK = true; break; } } if (!fileOK) { infos = "不支持上传此类型文件！目前支持的图片格式有：jpg|jpeg|gif|bmp|png|icon"; } else { file.SaveAs(System.Web.HttpContext.Current.Request.MapPath("~/books/BookPic/") + theFileName); infos = "ok" + theFileName; } } } else { infos = "没有读取到文件！"; } return infos; } }
转载于:https://www.cnblogs.com/meihao1989/p/3699300.html
相关资源：js无刷新上传图片例子