<link href="~/Content/fileinput.min.css" rel="external nofollow" rel="stylesheet" />
<script src="~/scripts/jquery-1.10.2.min.js"></script>
<script src="~/scripts/fileinput.js"></script>
<script src="~/scripts/zh.js"></script>

<input type="file" id="uploaddoc" name="file" class="file" multiple />//上傳按鈕 multiple為可多文件上傳 
<input type="hidden" id="Doc" name="doc" value="" />//保存文件路徑 

$("#uploaddoc").fileinput({ 
    language: 'zh', 
    uploadUrl: '/Form/upload',//后臺上傳方法 
    allowedFileExtensions: ['doc', 'docx'],//上傳文件擴展名 
    shouUpload: false, 
    showRemove: false, 
    browseClass: 'btn btn-danger', 
    maxFileSize: 5000, 
    maxFileNum: 10, 
    allowedPreviewTypes: null, 
    previewFileIconSettings: { 
      'doc': '<i class="fa fa-file-word-o text-muted"></i>' 
    }, 
    previewFileExtSettings: { 
      'doc': function (ext) { 
        return ext.match(/(doc|docx)$/i); 
      } 
    } 
  });

var List = new Array();//聲明保存上傳文件路徑數組對象 
  //上傳 - 刪除 
  $('#uploaddoc').on('filesuccessremove', function (event, key) { 
    var abort = true; 
    if (confirm("確定要刪除已上傳的文件嗎？")) { 
      abort = false; 
    } 
    var index1; 
    $.each(List, function (index, item) { 
      if (item.KeyID == key) {//默認fileinput.js的key與KeyID不一致，需要改動源碼，詳情見下文 
        index1 = index; 
        $.post("/Form/uploaddelete", { key: item.KeyID, path: item.path });//刪除以上傳到本地的文件 
      } 
    }); 
    List.splice(index1, 1); 
    var path = ""; 
    $.each(List, function (index, item) { 
      path += item.path; 
    }); 
    $("#Doc").val(path);//修改保存的文件路徑 
  }); 
  //取消上傳事件，左上角的取消按鈕 
  $('#uploaddoc').on('filecleared', function (event, files) { 
    $.each(List, function (index, item) { 
      $.post("/Form/uploaddelete", { key: "all", path: item.path }); 
    }); 
    List = new Array();//清空保存的文件路徑數組對象，這里是賦值給新的空對象，應該可以優化為刪除以保存的所有值 
    $("#Doc").val(""); 
  }); 
 
  //上傳 - 成功 
  $("#uploaddoc").on("fileuploaded", function (event, data, previewId, index) { 
    var form = data.form, files = data.files, extra = data.extra, 
    response = data.response, reader = data.reader; 
    List.push({ path: response.path, KeyID: previewId }) 
    $("#Doc").val($("#Doc").val() + response.path); 
    //$("#Doc").val(List); 
  }); 

//上傳方法  
public JsonResult Upload() 
    { 
      HttpPostedFileBase file = Request.Files["file"]; 
      if (file == null) 
      { 
        return Json(new { error = "上傳異常" }); 
      } 
      var ext = Path.GetExtension(file.FileName); 
      var filename = Path.GetFileNameWithoutExtension(file.FileName); 
      var serverfilenname = Guid.NewGuid().ToString("n") + "_" + filename + ext; 
      try 
      { 
        var path = "/File"; 
        var dic = string.Format("{0}/{1}/{2}/{3}", path, DateTime.Today.Year.ToString(), DateTime.Today.Month.ToString(), DateTime.Today.Day.ToString()); 
        if (!Directory.Exists(Server.MapPath(dic))) 
        { 
          Directory.CreateDirectory(Server.MapPath(dic)); 
        } 
        var webpath = string.Format("{0}/{1}", dic, serverfilenname); 
        var serverpath = Path.Combine(Server.MapPath(dic), serverfilenname); 
        file.SaveAs(serverpath); 
        return Json(new { 
          url = "/Form/uploaddelete",//定義要刪除的action，沒有用到可刪掉 
          key = serverfilenname, 
          path = webpath }); 
      } 
      catch (Exception ex) 
      { 
        return Json(new { error = "上傳異常" + ex }); 
      } 
    } 
//刪除本地文件方法 
public JsonResult UpLoadDelete() 
    { 
      try 
      { 
        var key = Request.Params["key"]; 
        var path = Request.Params["path"]; 
        if (string.IsNullOrEmpty(key) || string.IsNullOrEmpty(path)) 
        { 
          return Json(false, JsonRequestBehavior.DenyGet); 
        } 
        path = Server.MapPath(path); 
        if (System.IO.File.Exists(path)) 
        { 
          System.IO.File.Delete(path); 
          return Json(true, JsonRequestBehavior.DenyGet); 
        } 
        else 
        { 
          return Json(false, JsonRequestBehavior.DenyGet); 
        } 
      } 
      catch (Exception) 
      { 
        return Json(false, JsonRequestBehavior.DenyGet); 
      } 
    }