At the moment, I have a button that sends a value to another form and displays result in a label. The problem is, I have 20 buttons that are labeled a to w that need to be coded and I am stumped as to how I can pass values from multiple buttons. Would it be a case statement in the form being passed to? I am a new user to VB.Net and still finding my way so any help would be gratefully received. I have included code sample for the first button 'A'. Thanks
frmMain
Private Sub btnA_MouseDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles btnA.MouseDown
If (e.Button = MouseButtons.Right) Then
'Dim curButton As Button = DirectCast(sender, Button)
'frmRacks.buttonName = curButton.Name 'Dynamic alternative to frmRacks.buttonName = "A"
frmRacks.buttonName = "A"
frmRacks.Show()
ElseIf (e.Button = MouseButtons.Left) Then
MessageBox.Show("To be coded")
End If
End Sub
frmRacks
Public Class frmRacks
Public buttonName As String
Private Sub racksfrm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
lblRacks.Text = buttonName
End Sub
EDIT: New project
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim button1 As Button = New Button
Dim button2 As Button = New Button
Dim button3 As Button = New Button
With button1
.Name = "button1"
.Left = 0
AddHandler .MouseDown, AddressOf btn_MouseDown
'Add remaining properties for button1
End With
With button2
.Name = "button2"
.Left = 100
AddHandler .MouseDown, AddressOf btn_MouseDown
'Add remaining properties for button2
End With
With button3
.Name = "button3"
.Left = 200
AddHandler .MouseDown, AddressOf btn_MouseDown
'Add remaining properties for button3
End With
Me.Controls.Add(button1)
Me.Controls.Add(button2)
Me.Controls.Add(button3)
End Sub
Private Sub btn_MouseDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs)
Dim curButton As Button = DirectCast(sender, Button)
Dim curButtonName As String = curButton.Name 'This string would change on account of the button you have clicked
Form2.buttonName = curButtonName
Form2.Show()
'MessageBox.Show("You clicked the button called " & curButtonName.ToUpper)
End Sub
End Class
Public Class Form2
Public buttonName As String
Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
lblRacks.Text = buttonName
End Sub
End Class
Here you have a sample code which hopefully will help you to get clearer ideas:
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
Dim button1 As Button = New Button
Dim button2 As Button = New Button
Dim button3 As Button = New Button
With button1
.Name = "button1"
.Left = 0
AddHandler .MouseDown, AddressOf btn_MouseDown
'Add remaining properties for button1
End With
With button2
.Name = "button2"
.Left = 100
AddHandler .MouseDown, AddressOf btn_MouseDown
'Add remaining properties for button2
End With
With button3
.Name = "button3"
.Left = 200
AddHandler .MouseDown, AddressOf btn_MouseDown
'Add remaining properties for button3
End With
Me.Controls.Add(button1)
Me.Controls.Add(button2)
Me.Controls.Add(button3)
End Sub
Private Sub btn_MouseDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs)
Dim curButton As Button = DirectCast(sender, Button)
Dim curButtonName As String = curButton.Name 'This string would change on account of the button you have clicked
MessageBox.Show("You clicked the button called " & curButtonName.ToUpper)
End Sub
Related
My program contains buttons in a FlowLayoutPanel.
I want to disable any button when right click on it and click "Disable" in the ContextMenuStrip.
My code is:
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
For i As Integer = 0 To 30
Dim btn As New Button
btn.Name = i
btn.Text = i
btn.ContextMenuStrip = ContextMenuStrip1
FlowLayoutPanel1.Controls.Add(btn)
Next
End Sub
End Class
declare a public varibale for keeping a control
public ctrl as button = nothing
you can create a right click by putting this code on mouse down...
If e.Button <> Windows.Forms.MouseButtons.Right Then Return
Dim cms = New ContextMenuStrip
ctrl = sender
Dim item1 = cms.Items.Add("Disable")
item1.Tag = 1
AddHandler item1.Click, AddressOf Disable
end if
and in the diable sub you can code like this...
Private Sub Disable()
ctrl.enabled = false
End Sub
I have a pretty basic problem with button clicks in VB.Net I cannot seem to figure out.
First, I am creating a variable amount of buttons and adding them to the parent form.
Private Sub CreateUIObjects()
For i As Integer = 1 To NumberOfButtons
Dim button As Button = New Button()
Me.Controls.Add(button)
Next
End Sub
I know it is possible to handle a fixed amount of buttons clicked with the following code
Private Sub Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
Handles Button1.Click, Button2.Click, Button3.Click '... And so on
Dim b As Button = CType(sender, Button)
End Sub
But what do I do with not 3, but a variable amount of buttons?
Some code to experiment with
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
CreateUIObjects(3)
End Sub
Dim myButtonNames As String = "foobar"
Private Sub myButtonsClick(sender As Object, e As EventArgs)
Dim b As Button = DirectCast(sender, Button)
Debug.WriteLine(b.Name)
End Sub
Private Sub CreateUIObjects(NumberOfButtons As Integer)
Static ct As Integer = 0
For i As Integer = 1 To NumberOfButtons
ct += 1
Dim btn As Button = New Button()
btn.Name = myButtonNames & ct.ToString
btn.Text = btn.Name
btn.Location = New Point(ct * 20, ct * 20)
AddHandler btn.Click, AddressOf myButtonsClick
Me.Controls.Add(btn)
Next
End Sub
You can use something like this
AddHandler Button1.Click, AddressOf Button_Click
take a look http://msdn.microsoft.com/en-us/library/ms172877.aspx
I added some controls to my form at runtime and I need them to call a function when clicked. I don't know how many controls will be added but they all need to run the same function. How would I define the event? Can I define events based on all controls of a given class?
A simple example :
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
' creating control
Dim btn1 As Button = New Button()
Dim btn2 As Button = New Button()
btn1.Parent = Me
btn1.Name = "btn1"
btn1.Top = 10
btn1.Text = "Btn1"
btn2.Parent = Me
btn2.Name = "btn2"
btn2.Top = 50
btn2.Text = "Btn2"
'adding handler for click event
AddHandler btn1.Click, AddressOf HandleDynamicButtonClick
AddHandler btn2.Click, AddressOf HandleDynamicButtonClick
End Sub
Private Sub HandleDynamicButtonClick(ByVal sender As Object, ByVal e As EventArgs)
Dim btn As Button = DirectCast(sender, Button)
If btn.Name = "btn1" Then
MessageBox.Show("Btn1 clicked")
ElseIf btn.Name = "btn2" Then
MessageBox.Show("Btn2 Clicked")
End If
End Sub
End Class
Simply:
AddHandler Control.Event, AddressOf MethodExecuting
For example:
AddHandler Button1.Click, AddressOf ClickMethod
I am working on an inventory in Visual Basic 2010 Express Edition. I don't know the number of fields that will be necessary for the inventory. My hope was that I could add textboxes/checkboxes/buttons using for loops in the program. Is there a way to add controls to a form without using the toolbox?
Can I add controls by instantiating them in the program?
Yes.
Private Sub MyForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim MyTextbox as New Textbox
With MyTextbox
.Size = New Size(100,20)
.Location = New Point(20,20)
End With
AddHandler MyTextbox.TextChanged, AddressOf MyTextbox_Changed
Me.Controls.Add(MyTextbox)
'Without a help environment for an intelli sense substitution
'the address name and the methods name
'cannot be wrote in exchange for each other.
'Until an equality operation is prior for an exchange i have to work
'on an as is base substituted.
End Sub
Friend Sub MyTextbox_Changed(sender as Object, e as EventArgs)
'Write code here.
End Sub
Dim numberOfButtons As Integer
Dim buttons() as Button
Private Sub MyForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Redim buttons(numberOfbuttons)
for counter as integer = 0 to numberOfbuttons
With buttons(counter)
.Size = (10, 10)
.Visible = False
.Location = (55, 33 + counter*13)
.Text = "Button "+(counter+1).ToString ' or some name from an array you pass from main
'any other property
End With
'
next
End Sub
If you want to check which of the textboxes have information, or which radio button was clicked, you can iterate through a loop in an OK button.
If you want to be able to click individual array items and have them respond to events, add in the Form_load loop the following:
AddHandler buttons(counter).Clicked AddressOf All_Buttons_Clicked
then create
Private Sub All_Buttons_Clicked(ByVal sender As System.Object, ByVal e As System.EventArgs)
'some code here, can check to see which checkbox was changed, which button was clicked, by number or text
End Sub
when you call: objectYouCall.numberOfButtons = initial_value_from_main_program
response_yes_or_no_or_other = objectYouCall.ShowDialog()
For radio buttons, textboxes, same story, different ending.
Public Class Form1
Private boxes(5) As TextBox
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
Dim newbox As TextBox
For i As Integer = 1 To 5 'Create a new textbox and set its properties26.27.
newbox = New TextBox
newbox.Size = New Drawing.Size(100, 20)
newbox.Location = New Point(10, 10 + 25 * (i - 1))
newbox.Name = "TextBox" & i
newbox.Text = newbox.Name 'Connect it to a handler, save a reference to the array & add it to the form control.
AddHandler newbox.TextChanged, AddressOf TextBox_TextChanged
boxes(i) = newbox
Me.Controls.Add(newbox)
Next
End Sub
Private Sub TextBox_TextChanged(sender As System.Object, e As System.EventArgs)
'When you modify the contents of any textbox, the name of that textbox
'and its current contents will be displayed in the title bar
Dim box As TextBox = DirectCast(sender, TextBox)
Me.Text = box.Name & ": " & box.Text
End Sub
End Class
To add controls dynamically to the form, do the following code. Here we are creating textbox controls to add dynamically.
Public Class Form1
Private m_TextBoxes() As TextBox = {}
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles Button1.Click
' Get the index for the new control.
Dim i As Integer = m_TextBoxes.Length
' Make room.
ReDim Preserve m_TextBoxes(i)
' Create and initialize the control.
m_TextBoxes(i) = New TextBox
With m_TextBoxes(i)
.Name = "TextBox" & i.ToString()
If m_TextBoxes.Length < 2 Then
' Position the first one.
.SetBounds(8, 8, 100, 20)
Else
' Position subsequent controls.
.Left = m_TextBoxes(i - 1).Left
.Top = m_TextBoxes(i - 1).Top + m_TextBoxes(i - _
1).Height + 4
.Size = m_TextBoxes(i - 1).Size
End If
' Save the control's index in the Tag property.
' (Or you can get this from the Name.)
.Tag = i
End With
' Give the control an event handler.
AddHandler m_TextBoxes(i).TextChanged, AddressOf TextBox_TextChanged
' Add the control to the form.
Me.Controls.Add(m_TextBoxes(i))
End Sub
'When you enter text in one of the TextBoxes, the TextBox_TextChanged event
'handler displays the control's name and its current text.
Private Sub TextBox_TextChanged(ByVal sender As _
System.Object, ByVal e As System.EventArgs)
' Display the current text.
Dim txt As TextBox = DirectCast(sender, TextBox)
Debug.WriteLine(txt.Name & ": [" & txt.Text & "]")
End Sub
End Class
You can get your Button1 location and than increase the Y value every time you click on it.
Public Class Form1
Dim BtnCoordinate As Point
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim btn As Button = New Button
BtnCoordinate.Y += Button1.Location.Y + 4
With btn
.Location = New Point(BtnCoordinate)
.Text = TextBox1.Text
.ForeColor = Color.Black
End With
Me.Controls.Add(btn)
Me.StartPosition = FormStartPosition.CenterScreen
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Button1Coordinate = Button1.Location
End Sub
End Class
I'm newbie in vb.net and I just have something to ask you.
I want to create a simple program and I'm trying to do this with run-time design.
with this form, when you click on the button1 with the caption(Text) "Show Another Form", another form will be created with this code:
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim NewForm As New Form
Dim btnCancel As New Button
NewForm.StartPosition = FormStartPosition.CenterScreen
NewForm.FormBorderStyle = Windows.Forms.FormBorderStyle.None
NewForm.BackColor = Color.WhiteSmoke
NewForm.Size = New Size(400, 200)
NewForm.FormBorderStyle = Windows.Forms.FormBorderStyle.Sizable
btnCancel.Text = "Cancel"
btnCancel.Size = New Size(150, 50)
btnCancel.Location = New Point(50, 50)
NewForm.Controls.Add(btnCancel)
NewForm.ShowDialog()
AddHandler btnCancel.Click, AddressOf CancelClick
End Sub
Public Sub cancelclick(ByVal sender As Object, ByVal e As EventArgs)
Dim x As String = MessageBox.Show("Exit", "", MessageBoxButtons.YesNo, MessageBoxIcon.Warning)
If x = vbYes Then End
End Sub
End Class
How can I exit the form I've created when you click on the Cancel Button. The code I've provided doesn't work. Pls help me out. Thanks
Try attach handler code before show dialog
NewForm.Controls.Add(btnCancel)
AddHandler btnCancel.Click, AddressOf CancelClick
NewForm.ShowDialog()
In your code change the AddressOf CancelClick to AddressOf cancelclick
EDIT:
Change the NewForm.ShowDialog() to NewForm.Show() and also change the code as below code then definitely it will work.
Public NewForm As Form
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
NewForm = New Form
Dim btnCancel As New Button
NewForm.StartPosition = FormStartPosition.CenterScreen
NewForm.FormBorderStyle = Windows.Forms.FormBorderStyle.None
NewForm.BackColor = Color.WhiteSmoke
NewForm.Size = New Size(400, 200)
NewForm.FormBorderStyle = Windows.Forms.FormBorderStyle.Sizable
btnCancel.Text = "Cancel"
btnCancel.Size = New Size(150, 50)
btnCancel.Location = New Point(50, 50)
NewForm.Controls.Add(btnCancel)
AddHandler btnCancel.Click, AddressOf cancelclick
NewForm.Show()
End Sub
Public Sub cancelclick(ByVal sender As Object, ByVal e As System.EventArgs)
Dim x As String = MessageBox.Show("Exit", "", MessageBoxButtons.YesNo, MessageBoxIcon.Warning)
If x = vbYes Then End
End Sub