FileUpload在页面刷新时能否不刷新？

ydp_00769 2010-09-21 08:53:10

FileUpload控件如果已经选择了文件，里面有路径，但我如果选一下dropdownlist下拉中的某一项，执行了post后，FileUpload控件就又刷新置空了，又得重选文件路径。能否当页面刷新时，FileUpload控件已选的路径值还在？

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shuo20080722 2010-09-21

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jquery DropDownList

happy664618843 2010-09-21

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Ajax无刷新用iframe

 context.Response.ContentType = "text/plain";

            HttpResponse Response = context.Response;

            HttpRequest Request = context.Request;

            HttpPostedFile file = Request.Files["upfile"];

            Response.ContentType = "text/html";

            Response.Charset = "UTF-8";

            //定义新的文件名 和描述

            string newfilename = Guid.NewGuid().ToString(), des = Request.Form["des"];

            if (file.FileName == "")

            {

                Response.Write("<script>parent.UpdateMsg('','');</script>");

            }

            else

            {

                newfilename += System.IO.Path.GetExtension(file.FileName);



                try

                {

                    file.SaveAs(context.Server.MapPath("fileupload/"+newfilename));

                    Response.Write("<script>parent.UpdateMsg('" + Js(des) + "','" + newfilename + "');parent.window.iframes['ajaxifr'].contentWindow.document.getElementById('upfile').value=''</script>");

                    des = "";



                }

                catch {

                    Response.Write("<script>alert('保存文件失败！\\n请检查文件夹是否有写入权限！');</script>");

                }

            }

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >

<head>

    <title>Ajax实现无刷新上传文件</title>

    <script type="text/javascript">

     function check(f){

      if(f.des.value==''){

         alert('请输入文件描述！');f.des.focus();return false;

      }

      if(f.upfile.value==''){

        alert('请选择文件！');f.upfile.focus();return false;

      }

    }

    

    function UpdateMsg(des,filename)

    {

       if(filename=="")

       {

         alert('未上传文件!');

         return false;

       }

       document.getElementById("ajaxMsg").innerHTML="你输入的文件描述为"+des+"<br/>" +'上传的图像为:<a href="fileupload/'+filename+'"  target="_blank" >'+filename+'</a>';

 

    }

    

    </script>

</head>

<body>

    <form id="form1" runat="server" method="post" enctype="multipart/form-data" action="upload.ashx" target="ajaxifr" onsubmit="return check(this) ">

    <div>

    <iframe style="display:none"  name="ajaxifr" ></iframe>

      文件描述：<input type="text" name="des" id="des" /><br />

    选择文件：<input type="file" name="upfile" id="upfile" /><br />

    <input type="submit" value="提交" />

     <div id="ajaxMsg"></div>

    </div>

    </form>

</body>

</html>