ASP.NET MVC 4 Ajax上传文件

这两天一直纠结着表单的问题。想在一个表单里实现三个功能：

输入查询条件，点击查询；
导出查询数据；
上传文件；

方法有很多，乱花渐欲迷人眼，尝试了很多，无果。大致说的是，给不同按钮写js代码，在js代码里设置url和get、post、multipart/form-data等属性。看到猎风的demo很不错：

 <script type="text/javascript">

     function save()

     {

         document.form1.action="a.asp";

         document.form1.submit();

     }

     function send()

     {

         document.form1.action="b.asp";

         document.form1.submit();

     }

 </script>

 </head>

 <body>

 <form name="form1">

   <input type="text" name="username" value="scott">

   <input type="button" value="发送" onclick="send();">

   <input type="button" value="保存" onclick="save();">

 </form>

 </body>

很清晰的代码!可惜我用不上。

后来终于做了一个艰难的决定——上传文件用一个form，另两个功能用一个form，总共两个form。

上传文件用MVC的html辅助方法吧：

@using (@Html.BeginForm("ImportExcel0", "BOM",  FormMethod.Post, new { id = "UploadForm", enctype = "multipart/form-data" }))

{

     <input type="file" id="FileUpload1" name="FileUpload1" />

     <input id="import" type="submit" value="导入Excel" />

}

哦，这个虽然可以上传文件，但是刷新页面会重复提交。好吧，用Ajax.BeginForm，这个是异步的应该不会导致重复提交。折腾许久发现这个Ajax.BeginForm根本不能上传文件！要异步上传文件，还得用jquery.form.js这个插件。http://malsup.com/jquery/form/

Let's go !

HTML:

 <form id="UploadForm" name="UploadForm" action="/BOM/ImportExcel0/" method="post" enctype="multipart/form-data">

     <input type="file" id="FileUpload1" name="FileUpload1" />

     <input id="import" type="submit" value="上传" />

 </form>

Javascript:

  $("#UploadForm").ajaxForm({

             iframe: true,

             dataType: "json",

             beforeSubmit: function () {

                 if ($('#FileUpload1').val() == '') {

                     alert('请选择文件!');

                     return false;

                 }

             },

             success: function (result) {

                 $("#UploadForm").resetForm();

                 var DialogVars = $.parseJSON(result);//响应信息

                 if (result.success) {

                     toastr.success(result.message, 'Success Message')

                     alert(result.message);

                     //导入成功后记录数没实时更新

                     $("#list").trigger("reloadGrid");

                 }

                 else {

                     toastr.error(result.message, 'Error Message')

                     alert(result.message);

                 }

             },

             error: function (xhr, textStatus, errorThrown) {

                 $("#UploadForm").resetForm();

                 toastr.error('文档上传错误.', 'Error Message')

             }

         });

这里有些东西后面介绍。

Controller:

  public ActionResult ImportExcel0()

        {

            if (Request.Files["FileUpload1"] != null && Request.Files["FileUpload1"].ContentLength > )

            {

                string fileName = System.IO.Path.GetFileName(Request.Files["FileUpload1"].FileName);

                //string extension = System.IO.Path.GetExtension(fileName);

                string serverPath = string.Format("{0}/{1}", Server.MapPath("~/Content/UploadedFolder"), fileName);

                if (System.IO.File.Exists(serverPath))

                    System.IO.File.Delete(serverPath);

                Request.Files["FileUpload1"].SaveAs(serverPath);

                try

                {

                    ImportExportData.ImportExcel(serverPath, "BOMs");

                    ViewBag.Msg = "good";

                    System.IO.File.Delete(serverPath);

                    return Json(new { success = true, message = "导入成功！", fileName = fileName });

                }

                catch (Exception ex)

                {

                    ViewBag.Msg = ex.Message;

                    System.IO.File.Delete(serverPath);

                    return Json(new { success = false, message = "导入失败" + ex.Message, fileName = fileName });

                }

            }

            return View("Index");

        }

看起来还行，可以运行。但是问题接踵而来。

1、在IE8里点击上传文件后，文本框内容不消失，如果继续点击上传按钮，还会上传一次。

aaarticlea/png;base64,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" alt="" />

2、在IE8里上传成功后应该返回一个信息，这个信息是json格式的，但是IE8接收不到json格式的数据！实际情况是，当点击上传按钮后，本期望的弹出信息没看到反而出来一个下载提示：

aaarticlea/png;base64,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" alt="" />

再次向IE致敬！

寻寻觅觅，终于得知是ContentType问题，这个类型应该设置为text/html才行。这个是在服务端设置的，传给客户端后再转成json的格式来接收。

再看Controller里的action：

 public ActionResult ImportExcel0()

        {

            if (Request.Files["FileUpload1"] != null && Request.Files["FileUpload1"].ContentLength > )

            {

                string fileName = System.IO.Path.GetFileName(Request.Files["FileUpload1"].FileName);

                //string extension = System.IO.Path.GetExtension(fileName);

                string serverPath = string.Format("{0}/{1}", Server.MapPath("~/Content/UploadedFolder"), fileName);

                if (System.IO.File.Exists(serverPath))

                    System.IO.File.Delete(serverPath);

                Request.Files["FileUpload1"].SaveAs(serverPath);

                try

                {

                    ImportExportData.ImportExcel(serverPath, "BOMs");

                    ViewBag.Msg = "good";

                    System.IO.File.Delete(serverPath);

                    //为避免IE8出现下载文件提示，需将ContentType设置为"text/html"

                    JsonResult jt = Json(new { success = true, message = "导入成功！", fileName = fileName });

                    jt.ContentType = "text/html";

                    return jt;

                    //增加以上3行代码。注释以下1行代码

                    //return Json(new { success = true, message = "导入成功！", fileName = fileName });

                }

                catch (Exception ex)

                {

                    ViewBag.Msg = ex.Message;

                    System.IO.File.Delete(serverPath);

                    JsonResult jt = Json(new { success = false, message = "导入失败" + ex.Message, fileName = fileName });

                    jt.ContentType = "text/html";

                    return jt;

                    //return Json(new { success = false, message = "导入失败" + ex.Message, fileName = fileName });

                }

            }

            return View("Index");

        }

这样一来居然把上面出现的两个问题同时解决了！

本来对于清除input type=file的问题愁肠百转，找到一个方法看起来很厉害的样子：

//清除file文本框的内容

    window.reset2 = function (e) {

        e.wrap('<form>').closest('form').get(0).reset();

        e.unwrap();

    }

现在不用纠结了。

注：

javascript代码里有个toastr，这个是个信息提示插件，详情可见：http://kevintsengtw.blogspot.com/2013/03/aspnet-mvc-jquery-form-plugin.html#.UoYcWdLWamQ

一些链接：

http://blog.163.com/rihui_7/blog/static/212285143201361735143401/
http://www.oschina.net/question/223750_123703
http://my.oschina.net/wangr15/blog/160054

深入理解jQuery中$.get、$.post、$.getJSON和$.ajax的用法
http://www.itivy.com/jquery/archive/2011/7/6/jquery-get-post-getjson-ajax.html