C# - Use KeyPress Event Logic For Textbox.Text Assignment?
May 31, 2011
I have the below code on the KeyPress event of a textbox howver a need has now come in meaning I have to do myTextbox.Text = "A input string"
Private Sub ChequeAmountKeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtChequeAmount.KeyPress
Dim tb As TextBox = sender
If (e.KeyChar = "." AndAlso tb.Text.Length = 0) Then
e.Handled = True
[Code]...
This input string could contain a format that I do not want and whilst the keypress event caters for the need when the user is typing I need to handle it in the case of a text assignment.I thought firing the keypress event after I assigned the text property but I dont think that will offer what I want.
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May 11, 2012
This is my code:
Private Sub prices_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles wholeprice_input_new_item.KeyPress, dozenprice_input_new_item.KeyPress, detailprice_input_new_item.KeyPress, costprice_input_new_item.KeyPress
[code]....
I want to validate all the characters. How I can make the event keypress validate all characters in a text box?
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Dec 13, 2011
how can I detect if press Enter in the Textbox Change event and not in Textbox Keypress?
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Mar 18, 2010
anyone know how to invoke the KeyPress event ? This code shows what I would like to do, but it simply calls the eventhandler and does not insert the text into the text box, so is not what I want/need.
[Code]....
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Apr 5, 2005
i know this has to be simple but i can find anything anywhere tonight on how to check if while a textbox has focus if the ctrl+v or ctrl+c was pressed i simply need to use it like such:[code]
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May 23, 2011
When i am pressing any key in the textbox it will return "A" Character.[code]...
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Aug 13, 2010
I have several multi-line textboxes that I want to lose focus (i.e. when the user presses the right arrow key) but the control wil not relinquish the focus.Simply put, I first verify if the selection start is at the end of the text, if it is, and the user presses the arrow key, it should move to the next textbox. some debug.print code placed in strategic locations indicates that the target textbox gets focus and immediately loses it and the source textbox gains focus once again. Essentially not allowing the textbox to lose focus.
Select Case
Case Keys.Right
tbRight.Focus()
[code]....
After changing the source textbox multi-line property to false, it behaves as expected. Is this a "feature" .. surely I don't have to resort to "SendKeys"
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Mar 14, 2011
In connection with a windows form's text control the keypress event handler provides a key's identity through the KeyChar property of the event argument. This works fine for all alphanumeric keys and Ctl-a ... Ctl-z, Backspace etc. but does nothing for such keys as Insert, Delete, Home, End, and the navigation keys. I would also want to read Ctl and Alt keys combinations etc. I have done these thing before, too many years ago, but forgotten it all. Tried the reference manual, but have not enough years left to succeed that way.
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Jun 10, 2011
I know you can validate textbox text by using the keypress events. But the form i'm working on has multiple groupboxes with multiple textboxes. So rather than having a sub routine to validate every groupbox, i was wanting to have just the one keypress event that handles the textbox entries, and depending on the textbox calls a specific validation routine.[code]
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Apr 9, 2010
Programming language is vb.net
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May 7, 2010
I have a Phidget Interface board that has 16 digital inputs. When I trigger an input it fires an event. The problem is that the event fires twice because it fires when the input goes high AND when the input goes back low. I just need it to trigger once per input state change (Input to high and input back to low = 1 button press There are 10 types of people in the world: those who understand binary, and those who don't.
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Jun 2, 2010
I couldn't manage what the matter is not even after searching. Here my question goes:I need to do a simple task (close my form on pressing escape key) and I use the following code:
Code:
Protected Overrides Sub OnKeyDown(ByVal e As System.Windows.Forms.KeyEventArgs)
Select Case (e.KeyData)
'Close on Escape
Well , it works when I click escape my form closes , but.. if I have pressed by accident or some else matter any of the arrow keys (up , down , left , right) before escape and then hit escape nothing happens. I checked if any other key does that and as I see it does not.
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Feb 15, 2012
I just want to ask why my KeyPress event is apparently not working. What I want is that when I press the letter m, the selectedindex property of my listboxes would change. Here is the code;
Select Case Asc(e.KeyChar)
Case 13
Try
tray.ListBox1.SelectedIndex = tray.ListBox1.SelectedIndex + 1
[Code]....
I also want to know what the "e.handled = true" is statement for. I set the KeyPreview property of my form to false and true but it's not working as well. the KeyPress event should be triggered regardless of the control within the form that is in focus.
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Nov 7, 2009
Is it possible to capture a keypress with my application, even if the application isn't focused?And if it is, could someone please point me in the right direction? (I.E things to look up, tutorials)
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Nov 15, 2011
I am trying to create keypress handler that will execute a line of code when Tab, Space, or Enter key is pressed or passed by the scanner gun while the control is in focus. I got it to work with space and enter key but with tab key, the cursor will just jump to the next tab stop without executing the code.
Private Sub Button2_KeyPress(sender As Object, e As System.Windows.Forms.KeyPressEventArgs) Handles Button2.KeyPress
Dim keyChar As Char
[Code].......
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Mar 4, 2009
I'm trying to create an application that uses a PictureBox to display an image. I use the arrows keys to switch images and the space bar to rotate the current image. Since the KeyDown or KeyPress events don�t get fired when I click the arrow keys, I had to override ProcessCmdKey. It works fine, the problem is: the applications also has a few buttons and when I click an arrow key the image gets switched but the button�s focus change as well, worst yet, when I press the space bar, the image gets rotated but the button which has the focus gets pressed.
[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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Mar 11, 2009
how to capture keypress event outside an application
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Jun 2, 2011
We Could Easily Called A Functions By Pressing Enter In keypress Event. On textbox in vb.net. Eg.:-
If e.KeyChar = Microsoft.VisualBasic.ChrW(13) Then
Call Fsn()
End If
But. I can not called the functions on ComboBox. IN similar fashion. please help me to called a Funtion when we press ENTER IN ComboBox.
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Jun 22, 2010
I am trying to add to items to a combobox by using the "enter" key. It does work when I add the first item, but if I manually clear the box and add another items it does not get added to the list.
(1) I click in the combobox and type "hello" and press the "enter" key
(2) I click on the dropdown arrow and see that "hello" is in the list
(3) I select "hello" in the box and erase it, item is still in the list
(4) I type "goodbye" in the box and press the "enter" key
(5) "hello" is still in the list but "goodbye" is not
Here is the code:
Private Sub CopyrightCombo_Keypress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles CopyrightCombo.KeyPress
If e.KeyChar = Microsoft.VisualBasic.ChrW(Keys.Return) Then
[code].....
if I comment the if/end if line and type "hello" the items added to the combobox list are: "h", "he", "hel", "hell", "hello" wich makes sens since the add items is run on every keypress? I know that my commands for adding items is good, I know that my keypress event is handled properly but not when I specify using the "enter" key.
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Dec 26, 2009
using a datagridview and it bind by 3 rows and 3 columns,my task is when the press the F5 key then need to execute some code, my problem is if the datagridview cell is focused then now i press F5 key then the next task is executed but if the cursor is in the cell and i press F5 Key then the Key events was fired
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Jul 19, 2010
I am using the Event Handler below for the Enter Key Press Event, it is running when ever any of the keys is pressed. This is not so much a problem when the app. is running, unnecessary yes. It is giving me problems when ever I am Debugging using Breakpoints. How can I change the Handler so it only runs when the Enter Key is Pressed, doing away with the If statement?
Private Sub Form1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
If e.KeyChar = Chr(Keys.Enter) Then
'Different code blocks will run here depending on what
'TextBox or Label is selected.
End If
End Sub
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Aug 9, 2009
As part of a program that I am composing, the user needs to enter a value by way of a NumericUpDown control on one particular form. Once this and other criteria have been evaluated, the program will then move to the next "step" of the program. If they use the spinner built into the NumericUpDown control, the event is fired on every change and that's all well and good, but if they double-click the value in the control then type the value in manually, it doesn't fire until the control no longer has focus. I can't depend that this might be the case however. Using the "KeyPress" event, I can in fact know when the control has focus and the user has typed but what I cannot seem to get it to do is to get the control to "read" these keystrokes as values until the control loses focus.
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Mar 10, 2011
I'm using VB.NET (2008) and .NET framework 3.5. In my application I've got an on screen button that, when pressed, sends "00" as the characters [via SendKeys.Send("00")]. I also have a keyboard that has a '00' key that sends "00", two zeros, when pressed. I'm picking up the keypress using the form's KeyDown event - it fires twice, once for each "0" and works whether the on-screen or keyboard '00' is pressed. There's also a singe '0' on-screen button and key on the keyboard that sends "0".
I want to be able to treat the "00" as a single event. I.E. in the KeyDown handler, if the character is a single zero "0", I would like to check the next character to see if it is also a zero "0". If it is then I can handle it appropriately, but also need to remove it (from the keyboard buffer?) so that it doesn't fire the second KeyDown event. If it's not a zero then it should be left to fire the next event in the normal fashion.
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Aug 8, 2009
how can i track keypress in keypress event of a combobox i try this:
[Code]...
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Aug 20, 2009
I've tired to use KeyPress event while in focus of my program's window in VB.Net, but it doesn't work.
For example I wanted to press the number "2" anywhere while in focus of the application and as effect the pixels of the window will change from 200,200 to 600,600 (hortizontal and vertical)
Private Sub Form1_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles MyBase.KeyPress
Form1_KeyPress(Keys.D2)
Dim size As Size
size = Me.Size
[Code]...
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Nov 15, 2011
I'm trying to create a WPF application and found out that there is no KeyPress event for Textboxes, so I used PreviewTextInput. Now, I want to have a function that will block the keys that will make the input data invalid. [code]Now, my problem is, when I choose numeric, the textbox still accepts spaces, how can I block the spacebar?
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Apr 28, 2010
I have a short program to try to capture keystrokes. The KeyPress Event does not activate?
Dim Hold As New TextBox
Private Sub Form1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
[code].....
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Sep 5, 2010
i have a textbox in my form i want to avoid special characters in keypress event
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Jan 18, 2011
i am using the following logic to capture the keypress event in a dataGridView so that I can edit numeric cells but cannot capture decimal value in my code i cannot pass the digit.
[Code]...
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