ASP.NET: Backspace Key Behavior?
Jun 29, 2011
I'm writing an in-house intranet application in ASP.NET and VB.NET. My 'customers' are beginner to medium-level users. All of our browsers are IE8 and above, standard.The application works great, except for one thing. The backspace key. When a user types an invalid number into a textbox, a RegularExpressionValidator and ValidatorCalloutExtender fire off and notify the user. Perfect. Except that, when the user closes the popup warning and notices the cursor is still flashing in the textbox, he/she feels it's time to hit the backspace key and delete that pesky field value.
Unfortunately, the browser interprets this action as a desire to go 'back' into the page history. My boss is screaming. His bosses are screaming. I have a headache.So, how can I turn off this behavior? I still need the backspace to eliminate characters in the textbox, but nothing else. Company policy here: Backspace is to delete characters from the screen. Nothing more, nothing less.
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Feb 28, 2009
I want to have a msgbox when user press 'backspace' in the textbox.
I wrote this:
Private Sub TextBox2_KeyPress(ByVal KeyAscii As Integer)
If KeyAscii = 8 Then
MsgBox("backspace")
End If
End Sub
Why it doesn't work?
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Jan 3, 2012
can i disable backspace in my keyboard in vb 2005.
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Dec 2, 2010
i am creating a backspace key for a calculator. first of all a currency needs to be chosen by clicking a button, when for example the is clicked the text is entered into the texbox. But when i use the backspace it deletes here is my code..
Private Sub btn_pound_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_pound.Click
'Enable the keypad when the pound sign is clicked,Disable the curency buttons after'
pnl_numbers().Enabled = True[code]....
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Feb 23, 2011
Private Const WM_KEYDOWN = &H100
Private Const WM_KEYUP = &H101
Private Const VK_BACKSPACE = &H8
[code].....
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Nov 28, 2009
I got this nice piece of code from someone on this forum which only allows user to input numbers or backspace i need to modify it to allow the - sign so user can input a negative number Can someone share with me the code to modify this
If Not Char.IsDigit(e.KeyChar) Then e.Handled = True
If e.KeyChar = Chr(8) Then e.Handled = False 'allow Backspace
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May 14, 2009
I need a backspace function for my program .. Basically I have a textbox where I can put numbers .. what I want is when I press a button it deletes the last character of the textbox
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Jul 7, 2009
Is there any way to exchange backspace with delete key. I hav used this code in key_down event of rtb
if e.KeyCode = Keys.Back then
SendKeys.Send ("{DELETE}")
endif
but now it works as both backspace and delete.
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Oct 18, 2010
You need to test for the backspace character, and if it's there, fix up the input.Maybe something like this:
If Right$(TxtQP.Text, 1) = vbBs Then
TxtQP = Left$(TxtQP, len(TxtQP)-1)
End If
Or is the backspace not showing up in the string, but as the input character kicking off your procedure?
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May 9, 2011
Below is the code I am using to restrict user from entering any other characters except for the predefined ones. But using my code I cannot hit backspace.
How to include backspace also ?
Dim s As String = "0123456789$"
If s.IndexOf(e.KeyChar) = -1 Then
e.Handled = True
End If
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Nov 11, 2009
My problem is that I have this code to paste text from my Web Browser into a richtextbox, but when the text is pasted, a new line is started (as if the text pasted in was a string and then the "enter button was used") So if I consistantly paste in the word "code" for example, I would get[code]...
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Aug 10, 2009
I have built an addin for outlook that has a usercontrol shimmed into the interface. Everything works wonderfully EXCEPT for one textbox on one subpanel of the control. I have tried everything I can think of, but have not been able to resolve the issue:
The textbox *(A regular System.Windows.Forms.Textbox) functions as you would expect in any application with one exception. It will NOT accept the backspace key. So much so that the KeyDown, KeyPress, KeyUp events will not even fire when I press the backspace key. There does not seem to be any parameter suppressing it, and the control has focus. What is even stranger is that it works completely fine if you hold down the shift key while pressing the backspace key.
[code]...
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Mar 31, 2011
I am using Visual Basic Express 2008.I have added the following code to my text box:
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
If Not IsNumeric(e.KeyChar) Then
[code]....
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Jun 21, 2010
I coded my textbox to be only type in numeric numbers. But the backspace doesn't work when I run the program anymore, Can't delete what has typed in the textbox.
Here is my code
Private Sub AmountTextBox_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles AmoutTextBox.KeyPress
Dim allowedChars As String = "0123456789"
[code]....
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Jun 1, 2010
I have two textboxes and as the user types in one I want to append the text to another textbox.How do I allow the user to delete characters in the first textbox with backspace/delete key and have those changes replicated in the 2nd textbox?
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Dec 25, 2010
My Ciphering program, Ciphers words from one text box to another one. A letter is put in front of each word to tell the length of the that word. Every character that gets entered into the text box will change the outputs text box. I am going to use HELLO as an example. The Number one, will represent the Original text, the number Two will represent the Ciphered text. [Code]
As you see, the first letter is the length of the word, as I said before. The other letters or gotten by getting the position of the letter in the alphabet and adding it with the length of the word. H H is the 8 letter in the alphabet, and so far, the length of the word is one. So you do 8 + 1 which is 8. AI That is where I got the I in this right here. HE H is the 8 letter in the alphabet, and now the word length is 2, so 8 + 2 = 10. The 10 letter in the alphabet is J, so the I in AI turns to J.
E is the 5 letter in the alphabet. 5 + 2 = 7. The 7 letter in the alphabet is G. That is where the G comes from. BJG The B is the second letter in the alphabet, and there is 2 letters in the word.
In order for me to keep track of each word, I store each word in a dictionary. That is the only method that I could get to work while using the word length character (The character in front of each word)
My big problem is if I want to backspace and go back for it to edit that word that it took a letter of.
My program know that there is a new word because when it recognizes that the selected character = " ", it creates a new add in the dictionary. Here is an example of 2 words that are ciphered.
HELLO THERE
EMJQQT EYMJWJ
I split it at the T to show you the 2 different words, and that the first word is ciphered the exact same as it was in the example at the top of the page.
Now I am pretty sure that I could get it to edit the most frequent word, but I know I would not be able to edit the past words because it seems that when I add something to the dictionary, it stays local as the variables, and not as new for its self. [Code]
That is not even close to exactly what the code looks like, but it is close I guess. Redundant, I know.What it does is for that word, each Letter is getting added to the Dictionary and is called by the number 1. So when H is typed, H gets added to item 1. When E is typed, item 1 is now HE, and so on for that whole word.
When a character = " ", a new dictionary is added but adding one to DicNum, and then repeating the process. What I have found out is that it will not keep the first dictionary, and come to think of it I only think that it keeps the most recent letter that was added to the dictionary.
The day that I was working on this I was searching for a while on how to use join, but found nothing. My question is, is there a better way or more efficient way to cipher each word and then edit the word that is being edited by backspace? Lets leave out the part where Dictionary1 and Dictionary2 or not need. [Code]
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Jun 20, 2011
my problem is I dont know what string i have to add here for the backspace. this is the line of the problem:
lname = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ "I cant delete characters using backspace in the textfield...Sub txtbox_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtbox.KeyPress
[Code]...
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Mar 28, 2009
So i need to give backspace function to my menu here is the menu:
[Code]...
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Oct 5, 2009
I am trying to make a textbox accept on the numbers 1-4 & the backspace key. The numbers part is working fine, but it will not delete the number once it's inputted into the box using backspace. Here's my existing code:
Private Sub txtCode_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtCode.KeyPress 'allows the textbox to only accept 1-4 & backspace If (e.KeyChar < "1" OrElse e.KeyChar > "4" _ AndAlso e.KeyChar = vbBack) Then e.Handled = True End
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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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May 20, 2012
Private Sub txtInput_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtInput.KeyPress
Dim len As Integer
[Code].....
i want to delete "b" from first textbox and i should delete "King" from second textbox the length of each word is same "Acer" "King" it is always 4 in length
but i am getting following error
"Index and count must refer to a location within the string. Parameter name: count"
i also tried by replacing "len-4" by another variable dim c as integer=len-4
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Nov 21, 2011
I have made a textbox, which restricts character use to numbers and periods only. Nice, but now I cant enter backspace to amend any data typed in my textbox.
Private Sub TextBox10_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox10.KeyPress
Dim allowedChars As String = "1234567890."
If allowedChars.IndexOf(e.KeyChar) = -1 Then
[code]....
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Nov 4, 2009
I'm trying to create a backspace button. For it, I have:
If Len(TextBox1.Text) > 0 Then
TextBox1.Text = Left(TextBox1.Text, Len(TextBox1.Text) - 1)
End If
I get the error: 'Public Property Left As Integer' has no parameters and its return type cannot be indexed.How do I, first off, solve the error, and then, make it functional?
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Apr 7, 2011
How i can create a button as soon as I squeeze him, he will erase the last letter written?exactly like BackSpace
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Jun 5, 2010
Here's my code snippet:
Private Sub txtLogin2_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtLogin2.KeyPress
'// Ceci empêche l'utilisateur d'écrire des caractères ASCII ou même des espaces..
e.Handled = Not Char.IsLetterOrDigit(e.KeyChar)
End Sub
It works fine and dandy except for one issue... the only way to delete text in the textbox using this is to highlight and hit DEL... But what if I wanted to simply back space... Any suggestions?
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Dec 16, 2009
I'm using VB.NET 2008. I have an Bound DataGridView with a numeric column that can be edited. However when one selects the number and backspaces there is an error. If I trap it in DataError Event the error message is "Input String was not in a correct format". How can I prevent this error?
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Nov 8, 2009
[code]The RichTextBox's text would act as if the user pressed backspace while typing in the TextBox.How is it possible to remove a character from the textbox when the backspace event happens?
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Jul 2, 2009
IS there a better way to do the following, I mean is there any way to replace the Word variable with a backspace directly instead of trimming the space after the word has been repalced?
For Each Word As String In remove_words
If user_input3.Contains(Word) Then
user_input3 = Regex.Replace(user_input3, Word, "")
[Code].....
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Nov 29, 2010
I am making a calculator. I need a button that functions like a Backspace-button on a calculator. Erase the last inserted char, or what ever may work.
I use:
Button1
TextBox1
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Nov 25, 2011
I have 3 text boxes that update with each other. One the user inputs the text, two the text is used for translation and instantly deleted, and three displays the translated text. If I need to backspace the code updates the translation adding double of each letter I delete. I need a way to skip all of the application code every time the backspace key is held. My current code here (full dictionary cut to save space).
Public Class Form1
Public Sub RichTextBox3_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles RichTextBox1.KeyDown
If e.KeyCode = Keys.Back Then
[Code] .....
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