Question

VB.net how to crate textbox mask that the only requirement is the last four characters .xls

Asked by: ssconce

Hi experts. I have a text box that users will enter the name of a file to export to excel.  I would like to force them to add the .xls extension.  Any help with this would be great. thanks

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Asked On
2009-11-03 at 15:07:02ID24869272
Topics

Programming for ASP.NET

,

Microsoft Visual Basic.Net

,

Visual Studio

Participating Experts
4
Points
125
Comments
8

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Answers

 

by: JackOfPHPosted on 2009-11-03 at 20:18:57ID: 25736374

Put this code in the lost focus event of the textbox

Dim txtbox as textbox = sender

If Not Right(txtbox.text,4) = ".xls" then
txtbox.text &= ".xls"
End if


Cheers,

 

by: Hawkvalley1Posted on 2009-11-03 at 22:07:24ID: 25736811

If this is the textbox's LostFocus event why would you need to ask for the sender object?
And you should unbox it with {CType(sender, Textbox).Text} anyway.
The Right function returns the number of pixels from the right edge of the control and the left edge of it's container's client area and takes no parameters as it is a read only property, how does that work here?

I would use Regex as it will force them to fix it or not be able to continue:

Imports System.Text.RegularExpressions
...
Private Sub txtbox_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtbox.LostFocus
   Dim m As Match = Regex.Match(txtbox.Text, "\w*.xml")
   If Not m.Success Then
     MessageBox.Show("Format must be ""myxmlfile.xml""")
     txtbox.Select()
   End If
End Sub

 

by: JackOfPHPosted on 2009-11-03 at 22:34:21ID: 25736927

To HawkValley,

How do you handle if the function has two or more handles?

Like this :

Private Sub txtbox_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtbox.LostFocus, txtbox2.Lostfocus

Using your code will only limit it to the specific textbox.

>>The Right function returns the number of pixels from the right edge of the control and the left edge of it's container's client area and takes no parameters as it is a read only property, how does that work here?

About the "Right function" try reading this link... You will learn something Hawkvalley!

http://msdn.microsoft.com/en-us/library/t32163bd%28VS.80%29.aspx

 

by: JackOfPHPosted on 2009-11-03 at 22:36:07ID: 25736939

To HawkValley,

RIGHT( ) Function

-Returns the specified number of rightmost characters from a character string.

From the link I posted above... :)

Maybe you have to do some more reading...

 

by: VipulKadiaPosted on 2009-11-03 at 23:39:39ID: 25737181

In Textbox's LostFocus, write following code :

If TextBox1.Text.Length > 4 Then
    If NOT Ucase(Mid(TextBox1.Text, TextBox1.Text.Length - 3, 4))=".XLS" then
        Messagebox.show("Please provide proper Extension.")
    End If
End If

 

by: roma2208Posted on 2009-11-04 at 03:26:17ID: 25738215

There is one way to use the RegularExpression in ASP.net but i don't know what will be the regular expression to match .xls extension. You can ask others for helping out in Regular expression

 

by: Hawkvalley1Posted on 2009-11-04 at 06:49:57ID: 25739821

To JackOfPH your link is for Visual FoxPro 9.0 SP2, I didn't see where he is using FoxPro. And he said "a" textbox not many. This is why I wrote what I did - I was confused with your code. Sorry you took that badly.


 

by: ssconcePosted on 2009-11-04 at 07:18:17ID: 31649711

Thanks all for your help, and some insight gained from the back and forth.

20120131-EE-VQP-002

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