Asp文件上传需要只允许PDF文件从侧面 [英] Asp fileupload need to allow only PDF file from clent side

问题描述

大家好，



i有一个fileupload控件需要从客户端验证只接受pdf。

如果我尝试上传其他文件除了pdf应该提醒并需要删除选定的路径



请给我解决方案。



< pre lang =c＃>< asp：FileUpload ID = FileUplod1 runat = server高度= 18px onclientclick = CheckFile（this）; /> ;

 函数 CheckFile（Cntrl）{
  var  file =  document 。的getElementById（Cntrl.name）; 
  var  len = file.value.length; 
  var  ext = file.value; 
  if （ext.substr（len  -   3 ，len）！=   pdf）
 {
 alert（  请选择doc或pdf文件）; 
  return   false ; 
} 
} 

解决方案

访问：

http://www.aspsnippets.com/Articles/ASPNet-FileUpload-File-Extension-Validation.aspx [ ^ ]

我有运行示例并尝试提供所需信息。请使用以下代码

 <   asp：asyncfileupload     onuploadedcomplete   =  FileUploadComplete    xmlns：asp   = ＃unknown >  
 runat =serverID =AsyncFileUploadImageWidth =400pxUploaderStyle =Modern
 CompleteBackColor =WhiteUploadingBackColor =＃0A7AC5ThrobberID =imgloading
 OnClientUploadError =uploadErrorCssClass =fileuploadTabIndex =6OnClientUploadStarted =uploadImageStart/> <   / asp：asyncfileupload  >  

  function  uploadImageStart（sender，args）{
  var  filename = args.get_fileName（）; 
 
  var  filext = filename.substring（filename.lastIndexOf（ 。）+  1 ）; 
 filext = filext.toLowerCase（）; 
  if （filext ==   pdf ）{
  return   true ; 
} 
 其他 {
  var  err =  new 错误（）; 
 err.name = ' 填充外部错误'; 
 err.message = ' 无效文件。只允许.pdf文件'; 
  throw （错误）; 
  return   false ; 
} 
} 
 
  function  uploadError（sender，args）{
 alert（args.get_errorMessage（ ））; 
 
} 

FileUploadComplete - 客户端后面的代码

javascript

< script type =   text / javascript> 
  var  validFilesTypes = [  bmp，  gif，  png，  jpg，   jpeg，  doc，  xls]; 
  function  ValidateFile（）
 {
  var  file =  document  .getElementById（ <％= FileUpload1.ClientID％> ;）; 
  var  label =  document  .getElementById（  <％= Label1.ClientID％>）; 
  var  path = file.value; 
  var  ext = path.substring（path.lastIndexOf（ ）+ 1，path.length）.toLowerCase（）; 
  var  isValidFile =  false ; 
  for （ var  i =  0 ; i< validfilestypes.length;> {
  if （ext == validFilesTypes [i]）
 {
 isValidFile =  true ; 
  break ; 
} 
} 
  if （！isValidFile）
 {
 label.style.color =   red; 
 label.innerHTML =  文件无效。请上传一个文件，其中包含 + 
  扩展名：\ n \ n + validFilesTypes.join（ ，）; 
} 
  return  isV alidFile; 
} 
< / script>< / script> 

代码背后的文件

  protected   void  btnUpload_Click（ object  sender，EventArgs e）
 {
  string  [] validFileTypes = {  bmp，   gif，  png，  jpg，  jpeg，  doc，   xls}; 
  string  ext = System.IO.Path.GetExtension（FileUpload1.PostedFile.FileName）; 
  bool  isValidFile =  false ; 
  for （ int  i =  0 ; i <  validFileTypes.Length; i ++）
 {
  if  （ext ==  。 + validFileTypes [i]）
 {
 isValidFile =  true ; 
  break ; 
} 
} 
 如果（！isValidFile）
 {
 Label1.ForeColor = System.Drawing。红色; 
 Label1.Text =  无效文件。请上传扩展名为 + $ b的文件$ b  string  .Join（ ，，validFileTypes）; 
} 
  else  
 {
 Label1.ForeColor = System.Drawing.Color.Green; 
 Label1.Text =  文件已成功上传。; 
} 
} 

Hello all,

i have one fileupload control need to validate from client side accept only pdf.
if i try to upload other file except pdf should give alert and need to remove selected path

please give me solution.

<asp:FileUpload ID="FileUplod1" runat="server" Height="18px" onclientclick="CheckFile(this);" />

function CheckFile(Cntrl) {
        var file = document.getElementById(Cntrl.name);
        var len = file.value.length;
        var ext = file.value;
        if (ext.substr(len - 3, len) != "pdf")
        {
            alert("Please select a doc or pdf file ");
            return false;
        }
    }

解决方案

Visit Here:
http://www.aspsnippets.com/Articles/ASPNet-FileUpload-File-Extension-Validation.aspx[^]

I have running example and tried provide required info. please use below code

<asp:asyncfileupload onuploadedcomplete="FileUploadComplete" xmlns:asp="#unknown">
                                    runat="server" ID="AsyncFileUploadImage" Width="400px" UploaderStyle="Modern"
                                    CompleteBackColor="White" UploadingBackColor="#0A7AC5" ThrobberID="imgloading"
                                    OnClientUploadError="uploadError" CssClass="fileupload" TabIndex="6" OnClientUploadStarted="uploadImageStart" /></asp:asyncfileupload>

function uploadImageStart(sender, args) {
    var filename = args.get_fileName();

    var filext = filename.substring(filename.lastIndexOf(".") + 1);
    filext = filext.toLowerCase();
    if (filext == "pdf") {
        return true;
    }
    else {
        var err = new Error();
        err.name = 'Fill Ext Error';
        err.message = 'Not valid file. Only .pdf files allowed';
        throw (err);
        return false;
    }
}

function uploadError(sender, args) {
    alert(args.get_errorMessage());

}

FileUploadComplete - code behind

for client side javascript

<script type="text/javascript">
    var validFilesTypes=["bmp","gif","png","jpg","jpeg","doc","xls"];
    function ValidateFile()
    {
      var file = document.getElementById("<%=FileUpload1.ClientID%>");
      var label = document.getElementById("<%=Label1.ClientID%>");
      var path = file.value;
      var ext=path.substring(path.lastIndexOf(".")+1,path.length).toLowerCase();
      var isValidFile = false;
      for (var i=0; i<validfilestypes.length;>      {
        if (ext==validFilesTypes[i])
        {
            isValidFile=true;
            break;
        }
      }
      if (!isValidFile)
      {
        label.style.color="red";
        label.innerHTML="Invalid File. Please upload a File with" +
         " extension:\n\n"+validFilesTypes.join(", ");
      }
      return isValidFile;
     }
</script></script>

code behind file

protected void btnUpload_Click(object sender, EventArgs e)
{
    string[] validFileTypes={"bmp","gif","png","jpg","jpeg","doc","xls"};
    string ext = System.IO.Path.GetExtension(FileUpload1.PostedFile.FileName);
    bool isValidFile = false;
    for (int i = 0; i < validFileTypes.Length; i++)
    {
        if (ext == "." + validFileTypes[i] )
        {
            isValidFile = true;
            break;
        }
    }
    if (!isValidFile)
    {
        Label1.ForeColor = System.Drawing.Color.Red;
        Label1.Text = "Invalid File. Please upload a File with extension " +
                       string.Join(",", validFileTypes);
    }
    else
    {
        Label1.ForeColor = System.Drawing.Color.Green;
        Label1.Text = "File uploaded successfully.";
    }
}

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