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

var uploadHelper = {
    handleError: function (s, xhr, status, e) {
        // If a local callback was specified, fire it  
        if (s.error) {
            s.error.call(s.context || s, xhr, status, e);
        }

        // Fire the global callback  
        if (s.global) {
            (s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [xhr, s, e]);
        }
    },
    createUploadIframe: function (id, uri) {
        //create frame
        var frameId = 'jUploadFrame' + id;
        var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
        if (window.ActiveXObject) {
            if (typeof uri == 'boolean') {
                iframeHtml += ' src="' + 'javascript:false' + '"';

            }
            else if (typeof uri == 'string') {
                iframeHtml += ' src="' + uri + '"';

            }
        }
        iframeHtml += ' />';
        jQuery(iframeHtml).appendTo(document.body);

        return jQuery('#' + frameId).get(0);
    },
    createUploadForm: function (id, fileElementId, data) {
        debugger;
        //create form    
        var formId = 'jUploadForm' + id;
        var fileId = 'jUploadFile' + id;
        var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
        if (data) {
            for (var i in data) {
                jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
            }
        }
        var oldElement = jQuery('#' + fileElementId);
        var newElement = jQuery(oldElement).clone();
        jQuery(oldElement).attr('id', fileId);
        jQuery(oldElement).before(newElement);
        jQuery(oldElement).appendTo(form);



        //set attributes
        jQuery(form).css('position', 'absolute');
        jQuery(form).css('top', '-1200px');
        jQuery(form).css('left', '-1200px');
        jQuery(form).appendTo('body');
        return form;
    },

    ajaxFileUpload: function (s) {
        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout        
        s = jQuery.extend({}, jQuery.ajaxSettings, s);
        var id = new Date().getTime()
        var form = uploadHelper.createUploadForm(id, s.fileElementId, (typeof (s.data) == 'undefined' ? false : s.data));
        var io = uploadHelper.createUploadIframe(id, s.secureuri);
        var frameId = 'jUploadFrame' + id;
        var formId = 'jUploadForm' + id;
        // Watch for a new set of requests
        if (s.global && !jQuery.active++) {
            jQuery.event.trigger("ajaxStart");
        }
        var requestDone = false;
        // Create the request object
        var xml = {}
        if (s.global)
            jQuery.event.trigger("ajaxSend", [xml, s]);
        // Wait for a response to come back
        var uploadCallback = function (isTimeout) {
            var io = document.getElementById(frameId);
            try {
                if (io.contentWindow) {
                    xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML : null;
                    xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument : io.contentWindow.document;

                } else if (io.contentDocument) {
                    xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML : null;
                    xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument : io.contentDocument.document;
                }
            } catch (e) {
                uploadHelper.handleError(s, xml, null, e);
            }
            if (xml || isTimeout == "timeout") {
                requestDone = true;
                var status;
                try {
                    status = isTimeout != "timeout" ? "success" : "error";
                    // Make sure that the request was successful or notmodified
                    if (status != "error") {
                        // process the data (runs the xml through httpData regardless of callback)
                        var data = uploadHelper.uploadHttpData(xml, s.dataType);
                        // If a local callback was specified, fire it and pass it the data
                        if (s.success)
                            s.success(data, status);

                        // Fire the global callback
                        if (s.global)
                            jQuery.event.trigger("ajaxSuccess", [xml, s]);
                    } else
                        jQuery.handleError(s, xml, status);
                } catch (e) {
                    status = "error";
                    uploadHelper.handleError(s, xml, status, e);
                }

                // The request was completed
                if (s.global)
                    jQuery.event.trigger("ajaxComplete", [xml, s]);

                // Handle the global AJAX counter
                if (s.global && ! --jQuery.active)
                    jQuery.event.trigger("ajaxStop");

                // Process result
                if (s.complete)
                    s.complete(xml, status);

                jQuery(io).unbind()

                setTimeout(function () {
                    try {
                        jQuery(io).remove();
                        jQuery(form).remove();

                    } catch (e) {
                        jQuery.handleError(s, xml, null, e);
                    }

                }, 100)

                xml = null

            }
        }
        // Timeout checker
        if (s.timeout > 0) {
            setTimeout(function () {
                // Check to see if the request is still happening
                if (!requestDone) uploadCallback("timeout");
            }, s.timeout);
        }
        try {

            var form = jQuery('#' + formId);
            jQuery(form).attr('action', s.url);
            jQuery(form).attr('method', 'POST');
            jQuery(form).attr('target', frameId);
            if (form.encoding) {
                jQuery(form).attr('encoding', 'multipart/form-data');
            }
            else {
                jQuery(form).attr('enctype', 'multipart/form-data');
            }
            jQuery(form).submit();

        } catch (e) {
            jQuery.handleError(s, xml, null, e);
        }

        jQuery('#' + frameId).load(uploadCallback);
        return { abort: function () { } };

    },

    uploadHttpData: function (r, type) {
        var data = !type;
        data = type == "xml" || data ? r.responseXML : r.responseText;
        // If the type is "script", eval it in global context
        if (type == "script")
            jQuery.globalEval(data);
        // Get the JavaScript object, if JSON is used.
        if (type == "json")
            eval("data = " " + data + " " ");
        // evaluate scripts within html
        if (type == "html")
            jQuery("<div>").html(data).evalScripts();

        return data;
    }

};

调用 上传

  var sId = "file1";
            if ((document.all[sId].value.indexOf(".xls") == -1) && (document.all[sId].value.indexOf(".xlsx") == -1)) {
                alert("请选择Excel文件");
                return;
            }
            debugger;
            uploadHelper.ajaxFileUpload({
                url: 'ashx/Uploads.ashx', //用于文件上传的服务器端请求地址
                secureuri: false, //是否需要安全协议，一般设置为false
                fileElementId: '' + sId, //文件上传域的ID
                dataType: 'json', //返回值类型 一般设置为json
                type: 'post',
                success: function (data, status)  //服务器成功响应处理函数
                {

                    alert("上传成功" + data)
                    return;
               
                },
                error: function (data, status, e)//服务器响应失败处理函数
                {
                    alert(e);
                }
            });

后台 接收 C#  Uploads.ashx

<%@ WebHandler Language="C#" Class="Uploads" %>

using System;
using System.Web;
using System.IO;

public class Uploads : IHttpHandler {


    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/html";
        upLoad(context);
        //context.Response.Write("Hello World");
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
    public void upLoad(HttpContext context)
    {
        string strErr = "";
        try
        {
            strErr = "{ 'error':'xxxxxx', 'msg':'错误','imgurl':'错误','newFilename':'错误'}";
            HttpFileCollection files = HttpContext.Current.Request.Files;
            string msg = string.Empty;
            string error = string.Empty;
            string imgurl;
            string newFilename;
            if (files.Count > 0)
            {
                string path = context.Server.MapPath("~/App/files/");
                if (!Directory.Exists(path))
                {
                    // Create the directory it does not exist.
                    Directory.CreateDirectory(path);
                }


                Random rd = new Random(); 
                newFilename =  DateTime.Now.ToString("yyyyMMddHHmmssffff") + rd.Next(0, 9999).ToString("0000") + System.IO.Path.GetFileName(files[0].FileName);
                files[0].SaveAs(path + newFilename);
                msg = " 成功! 文件路径为:" + path + newFilename;
                imgurl = System.IO.Path.GetFileName(files[0].FileName);
                strErr = "{ 'error':'" + error + "', 'msg':'" + msg + "','imgurl':'" + imgurl + "','newFilename':'" + newFilename + "'}";
            }
        }
        catch (Exception ex)
        { 
            strErr = "{ 'error':'xxxxxx', 'msg':'错误','imgurl':'错误','newFilename':'错误'}";
        }
        finally
        { 
            context.Response.Write(strErr);
            context.Response.End();
        }
    }


}