Allowing Certain Types Of Characters For A Textbox?
Jun 25, 2010
I am creating a converter program (lengths, weights and such), basically just for the learning process because I still find myself very new to this.Well it's like this, I have a textbox where the user is supposed to write the value of the unit he/she wants to convert. As we all know there is a possibility to write in many weird strings which the program later on result in a big error. I recently managed to get rid of dots, because the program couldn't convert if there were a dot among the numbers "." (commas "," works great!). And now there are other types of errors I need to get fixed. I will make a short numeric list.
1. I wonder if it's possible to make dots "." to mean the same thing as a comma ",".
2. I also wonder if i could disable letters a-z or like -#@%&]?! and so on, i just want the basic 0-9 with a coma or dot.
3. I tried to make a Msgbox that tells the user when he/she has done an overflow, a number to big for the program to handle, for example [Observe the code is also trying to prevent the user from writing a minus "-":
(textbox1_textchanged)
If TextBox1.Text.Contains("-") Then
TextBox1.Text = TextBox1.Text.Replace("-", "")
[code]....
The minus thingy works great, but the 9999999... code, it always creates problems so I have commented it out for now until I know how to handle it.
4. Even though I got rid of the dot "." problem, the user is still able to write more then one comma, and I also want to get rid of that. The code I use right now for the "disable dot problem" is:
(textbox1_keypress)
If e.KeyChar = "," Then
If TextBox1.Text.IndexOf(",") > -1 Then
[code]....
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Nov 3, 2009
I have a textbox and I need to restrict entry to only the letters A-Z , a-z and the space key. I know I need to use something like
If (Microsoft.VisualBasic.Asc(e.KeyChar) < 65) _
Or (Microsoft.VisualBasic.Asc(e.KeyChar) > 90) etc
with an e.handled at the end
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Sep 7, 2010
I have to give textbox control id like below
<asp:TextBox ID="7_1" runat="server">
It is not allowing me. If I give
<asp:TextBox ID="Test7_1" runat="server">
Then it works fine. Why? Why can not give start with numbers?
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Mar 5, 2010
i am trying to make a program and i only want the user to be able to enter numbers and use the backspace this is my code so far.
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
Dim allowedChars As String = "0123456789"
[Code]....
i have tryed adding "ascii char (08)" to the program but its not worked
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Dec 21, 2011
Essentially I am trying to replicate the Windows 7 (In-Windows) activation key TextBox form. The Form where it will auto capitalize letters, remove or deny all non alphanumeric characters except dashes every 5 characters that will be auto-input.I assume this can be done with a fairly complicated replacement Regular Expression but I cannot seem to create one to fit the needs.
This is an Example of what I have right now, but it creates an infinite loop as it removes all characters including dashes, than adds a dash, which changes the text and removes the dash again.
[Code]...
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Nov 15, 2009
I have a textbox which controls the interval of a Timer control. How do I filter out letters? Is it possible to restrict entry to numbers only (like if you enter a letter or a space, nothing happens)? Is there a property of the textbox that can accomplish this?
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May 24, 2011
I have an ASP.Net 2.0 textbox which I need to be validated as having some content, but where whitespace alone is valid input. A required field validator seems to reject a pure whitespace input as invalid. A regular expression validator won't fire at all on empty content. Is there a simpler way round this than using a custom validator control?
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Aug 5, 2011
I have two textboxes. I type in one of them and the text gets copied in real time into another textbox. There is one catch. I need to replace specific character with something else.
If I enter a quote " in textbox1, it has to be replaced with " in textbox2.
I started with something like the below code, but obviously this does not work (tried different stuff - this is for demonstration only). In the example below 'a' represents " , and 'b' represents "
Private Sub TextBox1_KeyUp(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.KeyUp
TextBox2.Text = TextBox1.Text
[Code]....
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Dec 31, 2009
I'm using the ErrorProvider in VB.Net (2005) which is associated with a BindingSource that is bound to a custom object that I have created. This custom object contains a date field that has a "Date" data type that. I am using a "TextBox" to bind the date field in my form. My issue is, whenever the TextBox loses focus and is blank, "String not recognized as a valid DateTime" is displayed by the ErrorProvider and the focus can't be changed to any other control on the Form. It's good that the ErrorProvider validates entries on Date fields by default (I didn't set up my custom object to display this particular error for the date), but it should allow blank values. I want the user to be able to have a blank date with no error message displayed. How can this be done using a Date field bound to a TextBox?
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Mar 16, 2009
for example if a person types in multiple characters that represent a certain image in the input box for example if i type "tom" in the input box each letter represents a different image. Can i display those 3 images on the form somewhere? this is what i have so far...
Dim character As String = InputBox("Please enter a word")
I know that much but im not sure how i can connect the letter with a image for example
PictureBox1.Image = My.Resources.pic02
i want t to = my.resources.pic02 and i want it to display on the picturebox1.image
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Nov 14, 2011
I have a modal popup that allows an admin to choose from a variety of checkboxes to add features to a specific product. If there is a checkbox that an admin believes should be available but isn't because that feature is not in the database, I have added a textbox so that user can add a new feature to the product.
Once I added the textbox, it stopped allowing inserts. At first it was in the same If Else as the checkbox for each loop, but I have recently changed it so the textbox is in it's own for each loop. I have an underline under the words txtFeature.Text that says Value of type 'Char' cannot be converted to 'System.Web.UI.WebControl.Textbox.'
vb code:
For Each feature As ListItem In cbxAddFeature.Items
If feature.Selected Then
Dim strSQL As String = "INSERT INTO Marketing
[code]....
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Dec 13, 2010
I wanna type 140 characters in asp.net textbox with multiline when i type in textbox then the characters will be decreaded means if i type two characters in textbox then in label the available characters will be shown is 138..using vb.net
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Jun 28, 2006
I am having trouble making it where if the user types more than one "." decimal they get a error msg or whatever. Mainly having problems coding the Character "."
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Mar 16, 2009
I need code which will give messagebox when user types letter in textbox, when he types number all is ok
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Apr 2, 2011
Is there a way to make the textbox stop typing when a user types numbers? I don't want an error message, I'd just like the user to be able to insert 10 numbers and then it shouldn't add any newly typed numbers.[code]....
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Apr 3, 2011
there any way that i can always have a / as the first character in the textbox?
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Aug 17, 2011
Using VB2008.We have copied a file into a textbox for editing.It is not allowed to delete certain characters, for example the $.
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Aug 17, 2011
We have copied a file into a textbox for editing.It is not allowed to delete certain characters, for example the $.
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Feb 17, 2011
I am trying to show the square root of the number entered in the textbox. when the user presses Q (Uppercase), the square Root should be shown (in the textbox). I did manage to get the sqaure root, but the problem is that when I press Q the Letter Q is also typed in. For example, if I enter 25 in the textbox and press Q then I get Q5 as the result. Is there any work around to this problem ? Below is the code that I have used.
Private Sub Textbox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
If e.KeyChar = Chr(81) Then '81 for Letter Q
Dim root As Double = Math.Sqrt(Val(TextBox1.Text))
[code]....
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Jun 8, 2011
I wanted to set a maximum limit of characters of textbox in the properties but i can't find where it is located unlike in vb 6.0 you can set the characters in maxlength...
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Oct 30, 2011
I have a a multiline textbox, I want to take each and every character that the user enters and on a button press it replaces them with a set of characters, like:
i with x75d
or:
f with g8r
but the only way i have figured out how to do something like this is using a character in between each character and the split method, like:
Dim input() As String
Dim txt as String
Private Sub Encode_Click(ByVal sender As System.Object, ByVal e As
[Code]....
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Sep 4, 2009
i would like to limit a textbox input to 20 characters and only one line to input the characters.. i really have no idea where to start. i did see some forum threads, except they're for different options other than the option i need.. trujade.so much work to do and so many choices to choose from...
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Nov 25, 2009
I have a textbox that is for National Insurance Number, so I want the first 6 characters to be letters and the last to be a number. I know I need to use the Is Numeric function but I cannot get it to work.
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Apr 18, 2011
I am building a form and i want to prevent certain characters from being typed in a textbox? I want to disable the " and ' characters in some of my textboxes
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Nov 17, 2011
I've been searching on google for a long time and i can't seems to find a code that suits my need.
Heres my problem:
I want to disable all special characters excepted the dot(.) and the underscores(_).
Heres the code i used:
CODE:
Also, it doesnt allows me to erase my text with backspace if i ever do a mistake.
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Jul 9, 2009
How can I make a text box only accept certain characters?
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Mar 21, 2011
I want to limit the Textbox to a range of characters in VB. For example, I want the user to enter strings from 5-7 characters. I know how to limit the Textbox to a certain number of characters by MaxLength but that will give him the option of writing just 3 or 4 characters which I don't want to allow that from happening.
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Sep 25, 2010
i need to set it it dynamicaliy.i make password Box to as normal text-i mean- user could see the text what he entered.???
its for-> i need to use same control for " password sesion" and also the "item count entering" session ..??
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Sep 12, 2009
I have a program that users log their activities during the day in a textbox. I have the following code to print the textbox, but it does not print the tab characters that are in the textbox.
Private Sub PrintDocument1_PrintPage(ByVal sender As Object, ByVal e As System.Drawing.Printing.PrintPageEventArgs) Handles PrintDocument1.PrintPage
Try
[code].....
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Jun 21, 2009
can anyone help me in restricting characters or numbers in a textbox?
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