C# js 文件上传 ajaxfileupload

需要注意的地方这里文件域必须有 id 和name

 <input type="file" name="file1" id="file1" style=" 300px" />

需要引入的js ajaxfileupload.js 做过修改

  1 var uploadHelper = {
  2     handleError: function (s, xhr, status, e) {
  3         // If a local callback was specified, fire it  
  4         if (s.error) {
  5             s.error.call(s.context || s, xhr, status, e);
  6         }
  7 
  8         // Fire the global callback  
  9         if (s.global) {
 10             (s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [xhr, s, e]);
 11         }
 12     },
 13     createUploadIframe: function (id, uri) {
 14         //create frame
 15         var frameId = 'jUploadFrame' + id;
 16         var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
 17         if (window.ActiveXObject) {
 18             if (typeof uri == 'boolean') {
 19                 iframeHtml += ' src="' + 'javascript:false' + '"';
 20 
 21             }
 22             else if (typeof uri == 'string') {
 23                 iframeHtml += ' src="' + uri + '"';
 24 
 25             }
 26         }
 27         iframeHtml += ' />';
 28         jQuery(iframeHtml).appendTo(document.body);
 29 
 30         return jQuery('#' + frameId).get(0);
 31     },
 32     createUploadForm: function (id, fileElementId, data) {
 33         debugger;
 34         //create form    
 35         var formId = 'jUploadForm' + id;
 36         var fileId = 'jUploadFile' + id;
 37         var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
 38         if (data) {
 39             for (var i in data) {
 40                 jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
 41             }
 42         }
 43         var oldElement = jQuery('#' + fileElementId);
 44         var newElement = jQuery(oldElement).clone();
 45         jQuery(oldElement).attr('id', fileId);
 46         jQuery(oldElement).before(newElement);
 47         jQuery(oldElement).appendTo(form);
 48 
 49 
 50 
 51         //set attributes
 52         jQuery(form).css('position', 'absolute');
 53         jQuery(form).css('top', '-1200px');
 54         jQuery(form).css('left', '-1200px');
 55         jQuery(form).appendTo('body');
 56         return form;
 57     },
 58 
 59     ajaxFileUpload: function (s) {
 60         // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout        
 61         s = jQuery.extend({}, jQuery.ajaxSettings, s);
 62         var id = new Date().getTime()
 63         var form = uploadHelper.createUploadForm(id, s.fileElementId, (typeof (s.data) == 'undefined' ? false : s.data));
 64         var io = uploadHelper.createUploadIframe(id, s.secureuri);
 65         var frameId = 'jUploadFrame' + id;
 66         var formId = 'jUploadForm' + id;
 67         // Watch for a new set of requests
 68         if (s.global && !jQuery.active++) {
 69             jQuery.event.trigger("ajaxStart");
 70         }
 71         var requestDone = false;
 72         // Create the request object
 73         var xml = {}
 74         if (s.global)
 75             jQuery.event.trigger("ajaxSend", [xml, s]);
 76         // Wait for a response to come back
 77         var uploadCallback = function (isTimeout) {
 78             var io = document.getElementById(frameId);
 79             try {
 80                 if (io.contentWindow) {
 81                     xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML : null;
 82                     xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument : io.contentWindow.document;
 83 
 84                 } else if (io.contentDocument) {
 85                     xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML : null;
 86                     xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument : io.contentDocument.document;
 87                 }
 88             } catch (e) {
 89                 uploadHelper.handleError(s, xml, null, e);
 90             }
 91             if (xml || isTimeout == "timeout") {
 92                 requestDone = true;
 93                 var status;
 94                 try {
 95                     status = isTimeout != "timeout" ? "success" : "error";
 96                     // Make sure that the request was successful or notmodified
 97                     if (status != "error") {
 98                         // process the data (runs the xml through httpData regardless of callback)
 99                         var data = uploadHelper.uploadHttpData(xml, s.dataType);
100                         // If a local callback was specified, fire it and pass it the data
101                         if (s.success)
102                             s.success(data, status);
103 
104                         // Fire the global callback
105                         if (s.global)
106                             jQuery.event.trigger("ajaxSuccess", [xml, s]);
107                     } else
108                         jQuery.handleError(s, xml, status);
109                 } catch (e) {
110                     status = "error";
111                     uploadHelper.handleError(s, xml, status, e);
112                 }
113 
114                 // The request was completed
115                 if (s.global)
116                     jQuery.event.trigger("ajaxComplete", [xml, s]);
117 
118                 // Handle the global AJAX counter
119                 if (s.global && ! --jQuery.active)
120                     jQuery.event.trigger("ajaxStop");
121 
122                 // Process result
123                 if (s.complete)
124                     s.complete(xml, status);
125 
126                 jQuery(io).unbind()
127 
128                 setTimeout(function () {
129                     try {
130                         jQuery(io).remove();
131                         jQuery(form).remove();
132 
133                     } catch (e) {
134                         jQuery.handleError(s, xml, null, e);
135                     }
136 
137                 }, 100)
138 
139                 xml = null
140 
141             }
142         }
143         // Timeout checker
144         if (s.timeout > 0) {
145             setTimeout(function () {
146                 // Check to see if the request is still happening
147                 if (!requestDone) uploadCallback("timeout");
148             }, s.timeout);
149         }
150         try {
151 
152             var form = jQuery('#' + formId);
153             jQuery(form).attr('action', s.url);
154             jQuery(form).attr('method', 'POST');
155             jQuery(form).attr('target', frameId);
156             if (form.encoding) {
157                 jQuery(form).attr('encoding', 'multipart/form-data');
158             }
159             else {
160                 jQuery(form).attr('enctype', 'multipart/form-data');
161             }
162             jQuery(form).submit();
163 
164         } catch (e) {
165             jQuery.handleError(s, xml, null, e);
166         }
167 
168         jQuery('#' + frameId).load(uploadCallback);
169         return { abort: function () { } };
170 
171     },
172 
173     uploadHttpData: function (r, type) {
174         var data = !type;
175         data = type == "xml" || data ? r.responseXML : r.responseText;
176         // If the type is "script", eval it in global context
177         if (type == "script")
178             jQuery.globalEval(data);
179         // Get the JavaScript object, if JSON is used.
180         if (type == "json")
181             eval("data = " " + data + " " ");
182         // evaluate scripts within html
183         if (type == "html")
184             jQuery("<div>").html(data).evalScripts();
185 
186         return data;
187     }
188 
189 };

ajaxfileupload.js

调用上传

 1   var sId = "file1";
 2             if ((document.all[sId].value.indexOf(".xls") == -1) && (document.all[sId].value.indexOf(".xlsx") == -1)) {
 3                 alert("请选择Excel文件");
 4                 return;
 5             }
 6             debugger;
 7             uploadHelper.ajaxFileUpload({
 8                 url: 'ashx/Uploads.ashx', //用于文件上传的服务器端请求地址
 9                 secureuri: false, //是否需要安全协议，一般设置为false
10                 fileElementId: '' + sId, //文件上传域的ID
11                 dataType: 'json', //返回值类型 一般设置为json
12                 type: 'post',
13                 success: function (data, status)  //服务器成功响应处理函数
14                 {
15 
16                     alert("上传成功" + data)
17                     return;
18                
19                 },
20                 error: function (data, status, e)//服务器响应失败处理函数
21                 {
22                     alert(e);
23                 }
24             });

js 调用代码

后台接收 C# Uploads.ashx

 1 <%@ WebHandler Language="C#" Class="Uploads" %>
 2 
 3 using System;
 4 using System.Web;
 5 using System.IO;
 6 
 7 public class Uploads : IHttpHandler {
 8 
 9 
10     public void ProcessRequest(HttpContext context)
11     {
12         context.Response.ContentType = "text/html";
13         upLoad(context);
14         //context.Response.Write("Hello World");
15     }
16 
17     public bool IsReusable
18     {
19         get
20         {
21             return false;
22         }
23     }
24     public void upLoad(HttpContext context)
25     {
26         string strErr = "";
27         try
28         {
29             strErr = "{ 'error':'xxxxxx', 'msg':'错误','imgurl':'错误','newFilename':'错误'}";
30             HttpFileCollection files = HttpContext.Current.Request.Files;
31             string msg = string.Empty;
32             string error = string.Empty;
33             string imgurl;
34             string newFilename;
35             if (files.Count > 0)
36             {
37                 string path = context.Server.MapPath("~/App/files/");
38                 if (!Directory.Exists(path))
39                 {
40                     // Create the directory it does not exist.
41                     Directory.CreateDirectory(path);
42                 }
43 
44 
45                 Random rd = new Random(); 
46                 newFilename =  DateTime.Now.ToString("yyyyMMddHHmmssffff") + rd.Next(0, 9999).ToString("0000") + System.IO.Path.GetFileName(files[0].FileName);
47                 files[0].SaveAs(path + newFilename);
48                 msg = " 成功! 文件路径为:" + path + newFilename;
49                 imgurl = System.IO.Path.GetFileName(files[0].FileName);
50                 strErr = "{ 'error':'" + error + "', 'msg':'" + msg + "','imgurl':'" + imgurl + "','newFilename':'" + newFilename + "'}";
51             }
52         }
53         catch (Exception ex)
54         { 
55             strErr = "{ 'error':'xxxxxx', 'msg':'错误','imgurl':'错误','newFilename':'错误'}";
56         }
57         finally
58         { 
59             context.Response.Write(strErr);
60             context.Response.End();
61         }
62     }
63 
64 
65 }

Uploads.ashx

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原文地址：https://www.cnblogs.com/su-king/p/9957789.html