Space in fileupload control

12 Sep 2006 10:09 AM

HIK

I have a problem with the fileupload control. If the user inadvertantly
puts a space in the control, the page will not fire. I tried to trap
the error with a regular expression validator, but it apparently also
doesn't fire when there is a space in the control. Is there anyway to
catch this error and warn the user, or erase it?

Haim

13 Sep 2006 8:11 AM

Walter Wang [MSFT]

Hi Haim,

The form is not submitted because by default IE will not allow it if the
file upload control contains invalid path (it doesn't mean that the file
doesn't exist, just mean invalid path format, for exmaple, a space is
inserted at the front of the file name).

You can check this using a RegularExpressionValidator:

    <form id="form1" runat="server">
    <div>
    <asp:FileUpload ID="file1" runat="server" />
    <asp:Button ID="button1" Text="Upload" runat="server" />
    <asp:RegularExpressionValidator ID="val1" runat="server"
ControlToValidate="file1" EnableClientScript="true" ErrorMessage="Please
make sure valid file"
ValidationExpression="^[^\s].*"></asp:RegularExpressionValidator>
    </div>
    </form>

You can test this by:
1) Select a file by using the "Browse..." button of the file upload control
2) Insert a space at the front of the file name of the file upload control;
press TAB twice to cause it lose focus; you will notice the validator
failed and its error message is shown.

Please test it and tell me the result. If your code doesn't work, please
create a reproducible project and post it here or send it to me. Thank you.

Sincerely,
Walter Wang (waw***@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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14 Sep 2006 7:51 AM

HIK

Dear Walter,

Thank you for your reply. I have tried using regular expressions. Your
suggestion doesn't seem to catch anything. The one I am using is the
following:
^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))(.doc|.DOC|.rtf|.RTF|.wpd|.WPD|.htm|.HTM|.html|.HTML)$
which works well in most cases. for example [c:\abc.com] is valid and
[ c:\abc.com] is not valid.
But if the user inadvertantly types a space in the fileupload textbox
without clicking on the browse button,the validator does not fire. Even
if he clicks the browse button, types a space, clicks cancel and
continues, the space remains in the textbox and no validation is done.
The validation control does not show, and the user cannot see the space
that was inadvertantly put in the box.

Haim

Walter Wang [MSFT] wrote:

Show quoteHide quote

> Hi Haim,
>
> The form is not submitted because by default IE will not allow it if the
> file upload control contains invalid path (it doesn't mean that the file
> doesn't exist, just mean invalid path format, for exmaple, a space is
> inserted at the front of the file name).
>
> You can check this using a RegularExpressionValidator:
>
>     <form id="form1" runat="server">
>     <div>
>     <asp:FileUpload ID="file1" runat="server" />
>     <asp:Button ID="button1" Text="Upload" runat="server" />
>     <asp:RegularExpressionValidator ID="val1" runat="server"
> ControlToValidate="file1" EnableClientScript="true" ErrorMessage="Please
> make sure valid file"
> ValidationExpression="^[^\s].*"></asp:RegularExpressionValidator>
>     </div>
>     </form>
>
> You can test this by:
> 1) Select a file by using the "Browse..." button of the file upload control
> 2) Insert a space at the front of the file name of the file upload control;
> press TAB twice to cause it lose focus; you will notice the validator
> failed and its error message is shown.
>
> Please test it and tell me the result. If your code doesn't work, please
> create a reproducible project and post it here or send it to me. Thank you.
>
> Sincerely,
> Walter Wang (waw***@online.microsoft.com, remove 'online.')
> Microsoft Online Community Support
>
> ==================================================
> Get notification to my posts through email? Please refer to
> http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
> ications. If you are using Outlook Express, please make sure you clear the
> check box "Tools/Options/Read: Get 300 headers at a time" to see your reply
> promptly.
>
> Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
> where an initial response from the community or a Microsoft Support
> Engineer within 1 business day is acceptable. Please note that each follow
> up response may take approximately 2 business days as the support
> professional working with you may need further investigation to reach the
> most efficient resolution. The offering is not appropriate for situations
> that require urgent, real-time or phone-based interactions or complex
> project analysis and dump analysis issues. Issues of this nature are best
> handled working with a dedicated Microsoft Support Engineer by contacting
> Microsoft Customer Support Services (CSS) at
> http://msdn.microsoft.com/subscriptions/support/default.aspx.
> ==================================================
>
> This posting is provided "AS IS" with no warranties, and confers no rights.
>

14 Sep 2006 12:01 PM

Walter Wang [MSFT]

Hi Haim,

You can call a javascript function to validate the file upload control
before submitting the form:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs"
Inherits="Default2" %>

<!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 runat="server">
    <title>Untitled Page</title>
    <script type="text/javascript" language="javascript">
    function myPostback()
    {
        var re =
/^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))(.doc|.DOC|.rtf|.RTF|.wpd|.WPD|.h
tm|.HTM|.html|.HTML)$/;
        var m = re.exec(form1.file1.value);
        if (m != null) {
            alert(m[0]);
            return true;
        } else {
            alert('not match');
            return false;
        }
    }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:FileUpload ID="file1" runat="server" />
    <asp:Button ID="button1" OnClientClick="return myPostback();"
Text="Upload" runat="server" />
    </div>
    </form>

</body>
</html>

Regards,
Walter Wang (waw***@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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