Override The "GotFocus" And "LosFocus" Event Of The Textbox
Nov 7, 2009
I would like to somehow override the "GotFocus" and "LosFocus" event of the textbox.
Here's the deal. I have big registration form with +- 200 TextBoxes and I want the one that has focus to be highlighter [e.g. let's say change the background color to yellow]. I know, I could write the same code for 200 TextBoxes, but that would be time-killing and I'm really not in favour writing the same thing 200 times as well as with such a huge amount of copy-paste I'm almost sure I would make mistake somewhere.
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Apr 13, 2012
I want to modify this code or replace it. I want to override the the textbox's textchanged event in a user control.
Protected Overrides Sub OnTextChanged(ByVal e As System.Windows.Forms.ItemChangedEventArgs)
MyBase.OnTextChanged(e)
End Sub
[code]......
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Oct 8, 2009
I use to be a VB6 developer before migrating to .NET.
I am looking for a way to do something (as in, call a procedure) whenever a textbox gets focus in ASP.NET but I couldn't find my way out. I am using VB.NET.
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Oct 21, 2009
I can't seem to get the Form.GotFocus event to fire.I have two forms - a main window and a debug window.The debug window will always be shown with the main window. But, I don't want the debug window to appear in the task bar - it's unnecessary.While my program is running, when I select another program, my main window and the debug window are placed behind the program that I selected. From the task bar, I can bring my program back to the front by clicking on it in the task bar. The problem is, that now my debug window is behind the other program.I have code that will "DebugWindow.BringToFront", and it works. But I need some way to run do this when the main form gets the focus.I do not wish to make any of my forms Modal. At least not permanently. If the solution is to change the modal property of the form temporarily, then that wouldn't be a problem.
I tried Me.Enter, Me.Activated, Me.Click and a few other events. Me.Click only works when I click within the Form window, not the form's title bar. Me.Activated caused problems - The code ran, but it would always end with the focus on the Debug window. When I tried to click on the main form, the Activated event would fire again, sending the focus back to the debug window.[code]
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Jul 20, 2010
I'm trying to validate a few things in a form I'm building. It has a datagrid with clients info (taken from an access database) and a few textboxes where the user can type some search criteria. The thing is that those same textboxes are used to add new clients to the database and to modify a client's information if one from the datagrid is selected, so I made it that the buttons to insert and modify clients are disabled on load and thenevery time the text on a textbox changes ("TextChanged" event) they become enabled. So far so good. But then I wanted to make it so when a client from the datagrid is selected both buttons become disabled again until the text on a textbox changes (to make sure they're adding a different client and not the same one that was
selected).
I tried using the CellClick event from the datagrid to disable the buttons, but since every time a client is selected from the datagrid the info is shown on the textboxes, this triggers the TextChanged event too, and the buttons become available.So, is there a way I can tell the TextChanged event not to be triggered when the CellClick event occurs?
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Mar 24, 2010
I have a WinForms application (OwnerForm) with some UserControl. When textbox of UserControl is changed, I want to filter content of a OwnerForm. But how can I make it? I don't want to specify OwnerForm inside the user control. I know a solution to add manually handlers for MyUserControl.tb.TextChanged to some functions on a owner form, but I think it's bad way. I'll prefer to have overridable functions, but I can't imagine how to do it.
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Nov 26, 2009
I would like to shadow/override an event in VB.NET v2
I need to do it, because I need to implement a interface, let's name it IVisibleChanged, on the custom objects that does not have defined this event, and on the objects that already have defined this event (custom Button, by eg.)[code]...
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Nov 25, 2009
I would like to shadow/override an event in VB.NET. I do it only because I have to implement in this object an interface, that contains the same event like the base object itself, and I need to keep this base event as is it without modification nor supplementary event additions.How can I do it?
Public Shadows Event VisibleChanged As EventHandler Implements IVisibleChanged
So, I would like to implement a interface that contains VisibleChanged event, but to keep functional the myBase VisibleChanged event too.
[code].....
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Jun 1, 2011
I have this code that's suppose to override the form closing event, It fires off sucessfully however doesn't prevent the form from closing.
Private Sub Form_Close(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing
Me.Hide()
e.Cancel = True
End Sub
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Nov 10, 2009
short question: What's better?
Form KeyDown event vb Private Sub MainForm_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown End Sub
Override OnKeyDown
vb Protected Overrides Sub OnKeyDown(ByVal e As System.Windows.Forms.KeyEventArgs) MyBase.OnKeyDown(e) End Sub
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Jun 2, 2009
Ok, I've been searching all over the web for an answer to this and I'm getting nowhere. I've found several examples and tried code translators, but they either fail to compile at all (syntax is wrong) or fail to solve the problem. Here is what I am up against:
I am trying to implement a service object class for the POS for .NET library using VB9. Specifically, the BillDispenser class. I define my class and inherit from Microsoft.PointOfService.BillDispenser. As normal, it creates stubs for all the MustOverride (abstract) properties and methods that I need to override (I love that), EXCEPT for the DirectIOEvent. Apparently this event is defined as abstract in the POSCommon base class, but VB doesn't generate a stub for it.
No compile errors are generated from not defining it, but I get the following runtime error as soon as my unit test attempts to load the dll[code]...
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Jul 19, 2009
I'm using ASP.Net 2.0. I have a custom control that is inherits from a 3rd-party vendor's control. I'm trying to override the Render method. [code] What I need is that under certain situations I want to be able to render a Button instead of the original control.But I want the Button to have the same client Id as the control so that I can use javascript to manipulate it.How do I assign a clientid to the button?
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Nov 9, 2011
When editing vb.net forms code in vs2008, how do I select base class events that I want to override? In vs2003 there was a list of overridables in the drop down list but now that list is missing?
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Sep 8, 2009
I have to two forms. Form one has several check boxes and when a button is pressed, a second form is opened and certain functions are ran based on which check boxes are selected.The problem is that the second form doesn't show until all of the functions are done.I decided to use the Form's Activated event, which works fine. However, the event fires every time the form comes into focus.Is there anyway to override the event and make it only fire once?
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Feb 2, 2010
Basically, what I want to do is create a new control called EncryptedPictureBox. The image path I would be loading into ImageLocation would be the path of a 512 bit encrypted image. Normally if I load this type of file, it will not display. So I want to override Load() so that I can write the encrypted image to a stream, decrypt it, and then display the stream. I'm trying to save processing time so I don't have to grab the encrypted image, save it to disk as a decrypted image, then display it, then when done, delete the decrypted image from disk.
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Mar 26, 2011
Correct me if i'm wrong, but i believe most (if not all) classes in the CLR that raise events raise those events from protected methods, for example Form.OnMouseDown... so... In a subclass, when would you want to override the "OnXyzMethod" instead of simple adding an event handler like Visual Studio does by default when you want to handle a controls event?
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May 20, 2011
At the moment I have the following Command class:
Public Class SubscribeCommand
Implements ICommand
Private ReadOnly _vm As MainWindowViewModel
Public Sub New(ByVal vm As MainWindowViewModel)
_vm = vm
End Sub
[Code]...
In a tutorial i read, you have to implement add {} and remove {} for the canExecuteChanged-Event. But how can i do that, with vb.net?
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Jul 28, 2010
I have been experimenting with my windows form application(vb 2008/10) and made sure that the top part(glass part) extended to become a bit larger.
Now 1 problem occurs. Everything, like text, which is black, will become transparent so unreadable. With labels and pictures, I solved the problem, I just write a string(e.graphics.drawstring) and for labels / titles I use a long method(not important).
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May 25, 2011
It is possible to override textbox properties like selectionstart property
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Aug 9, 2011
I just start working with VB. In a programme I need to keep the value in text property after programme closed.That is why I want to change (override) Text property in TextBox.Then this value will be default value when I open the programme again.I will assing a value to textbox1 in a Sub.
Sub button1_click
Textbox1.text="ttt"
End Sub
Then I need to change the Text value under "Properties" window.TextBox1 System.Windows.Forms.TextBox
I think there is Get-Set method for property override but I dont know how to use.How can I do that?
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Nov 2, 2009
I am looking for a way to tell when a tab has taken focus. I tried the gotfocus call but it doesn't seem to get called when I click on the tab. Did a quick search on google but can't seem to find the answer.
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Jul 13, 2010
I have a mdi and 3 child windows.The program start with an empty mdi.With a menu you can open each child window once.When i open for example 2 windows. And close the one on top. The one left(the window under the one i closed) should get focus. How can i manage this?
why i need this?each childwindow has a event gotFocus. Depending on the focus my menu should change.
Private Sub frmMain_gotFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.GotFocus
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Sep 22, 2008
I just added a gotfocus and lostfocus handler for all of my textboxes. Below is my routines to call on gotfocus/lostfocus.
[Code]...
Now, my issue is that this works great if you use the mouse and click around in the textboxes. However, if you hit the TAB key to move around on the screen, the LostFocus event doesn't seem to work. All of my textboxes backcolor remains lightblue. What did I do wrong? What do I need to do to fix this problem?
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Apr 18, 2012
In vb.net I would like to set all numericUpDown (NUD) controls to select their value when they receive focus, like a text box does. Do I need to write a GotFocus handler for each NUD? I know I can use widthBox.Select(0, widthBox.ToString().Length) to do the selection I just need to be able to apply this to all NUD GotFocus events.
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Dec 30, 2010
I know that with the Command Button, you can utilize the PerformClick option. I would like to know how you would go about doing something similar for a Combobox.What I am looking to do is open the Combobox within the GotFocus method.
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Jul 29, 2011
I have two web browser controls on my form. I also have several buttons like bold, underline, etc. My probem is the gotfocus of the web control is not working correctly. If I click on the web browser control to add text the gotfocus is not fired. If I click on a text box first and then click in the browser control it is fired. I need to know which has focused so the bold etc know which control to work on.
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Aug 16, 2010
In VB6 we had a code inside textBox_MouseUp to call textBox_KeyUp(-1, 0) and the signature of KeyUp was
Private Sub textBox_KeyUp(ByRef KeyCode As Short, ByRef Shift As Short) Handles textBox.KeyUp
Now when I migrate to .NET I changed the KeyUp event to Private Sub textBox_KeyUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles textBox.KeyUp
How can I do this call textBox_KeyUp(-1,0) now from textBox_MouseUp event?
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Aug 31, 2009
The problem is that the method is getting called multiple times when the text box control gains focus. I am looking for it to just run once since the method is filling the text box control with data. Is there a common reason this happens? Its not looping cause it is happening on everyone of my controls that use the GotFocus method.
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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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Apr 24, 2009
I have the following event.
Private Sub txtOperationCode_Keydown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles txtOperationCode.KeyDown, cmdEllipsis.KeyDown
Dim oOperation As COperationOutputTypeBS
[code]....
i wanted that on the form that i am calling in the event :frmSearchOperationCodes I will call txtOperationCode_Keydown event because I wanted that if txtOperationCode_Keydown is executed something will happen upon showing the other form.i have a textboxt, When i encoded a character on the textboxt and the user will press tab or enter automatically a form will be shown with a datagridview showing all items related to the character encoded on the textbox.
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