Here's a scernerio that will get what I am trying to accomplish....
Say I have a form with a textbox to enter a number and a button called "Create"
When a user enters a number and clicks create the form gets populated with the number of buttons entered in the textbox and the title of the buttons are labeled by consecutive numbers.
For example if you enter 5 the form will populate with 5 buttons labeled button1, button2, ...button5
When you click on these newly created buttons a messagebox will popup stating the buttons name.
Basically I need to know how to create events and populate them with code I guess
dynamically.
Please respond in a solution for a windows app not web. No JavaScript.
Please can someone respond with a code example this idea is a little foggy to me
'Make sure that the textbox contains a number.
If IsNumeric(TextBox1.Text) Then
'Make sure that it's a positive number.
If CInt(TextBox1.Text) > 0 Then
For i = 1 To CInt(TextBox1.Text)
Dim x As New Button
x.Name = "Button" & i.ToString
x.Top = 100 + (i * 30) 'To avoid stacking.
AddHandler x.Click, AddressOf y 'Add the event here.
'Add it to the form.
Controls.Add(x)
Next
End If
End If
Private Sub y(ByVal sender As System.Object, ByVal e As System.EventArgs)
MsgBox(CType(sender, Button).Name)
End Sub
Related
How to create multiple button controls with a for loop without getting the controls overlapped and without using location property in Vb.Net.
I have created 'n' number of vb controls dynamically but the created controls are getting overlapped to each other. When I use location property to each controls all the controls are getting displayed as per the location value.
The real problem is, I'm using a panel of width 300 and height 300, under that I need to display the dynamically created controls. I have figured it out which is tedious work and does take a lot of time. My idea is to find the panel width and height then need to check whether the new control which is getting created has ample of space to fit inside the panel.
I need to know few things,
1) How to display the controls dynamically using for loop without getting overlapped over each other and without using location property.
2) I need the container or the panel to grow as per the number of controls which gets created dynamically.
3) Accessing each controls which got displayed using an ID or educate or explain me any better idea.
I created a new WinForms project and added a Button to the top of the form. I added a FlowLayoutPanel under that and made it narrow enough to fit a single Button widthwise. I set the AutoSize property of the FLP to True and the FlowDirection to TopDown. I then added this code:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
'Create the new Button.
Dim btn As New Button
'Add it to the FLP
FlowLayoutPanel1.Controls.Add(btn)
'Get the position of the bottom, left of the Button relative to the form.
Dim pt = PointToClient(btn.PointToScreen(New Point(0, btn.Height)))
'Resize the form to provide clearance below the new Button.
ClientSize = New Size(ClientSize.Width, pt.Y + 10)
End Sub
I then ran the project and started clicking the Button I added. As expected, each click added a new Button to the FLP in a vertical column and the form resized to fit. In order to access such controls in code, you can simply index the Controls collection of the FLP.
try this helps you.
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
'Do Something
Else
'Do Something else
End If
Panel1.Controls.Clear()
For i As Integer = 0 To 10 Step 1
Dim b15 As New Button
b15.Text = "Test3"
b15.ID = "a" & i
AddHandler b15.Click, AddressOf updateFunc
Panel1.Controls.Add(b15)
Next
End Sub
I'm trying to create a non-definite number of textboxes in my program, place them in my form and later retrieve information from them.
I want to add one textbox at a time when I press a button.
I can add one textbox like this:
Private Sub Addsystem_Click(sender As Object, e As EventArgs) Handles Addsystem.Click
Form2.ShowDialog()
Dim mytext As New TextBox()
mytext.Location = New Point((OBstartfreq.Location.X), (OBstartfreq.Location.Y + 30))
Me.Controls.Add(mytext)
End Sub
Like this I can get only the text from the mytext textbox.
How can I make it that every time I press the button a new textbox will appear?
I'm using MDI container to run my bussiness application I created for my client.
Since using MDI means that when I open several forms they will still run in background all the time untill I close them manualy.
What I need is to make User Control or anything else that could preview all opened forms in Tab Form so my client can easily close all or some of opened forms without closing a form he is curently viewing.
For now I have used this code, so for now only first clicked item from menu appears as button, but not others clicked menu items.
Private Sub MenuStrip1_ItemClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ToolStripItemClickedEventArgs) Handles MenuStrip1.ItemClicked
Dim Button As New Button
Me.Panel5.Controls.Add(Button)
Button.Text = e.ClickedItem.Name
Button.Width = 50
Button.Height = 25
End Sub
Now I need to write a code to add more buttons bellow, also should add a code for adding buttons only when I click on SubMenu item (The one when is clicked new Form appear).
And also, I should now add a little Close button into previewed User-Button-Control.
From your comments, I understand that your ideas regarding adding buttons at runtime are not too clear and thus I am including a small code which hopefully will help you on this front. Start a new project and put a Panel (Panel5) and a Button (AddButtons) on it, and write this code:
Dim lastButtonIndex, lastLeft, lastTop As Integer
Private Sub Button_Click(sender As System.Object, e As System.EventArgs)
Dim curButton As Button = DirectCast(sender, Button)
If (curButton.Name = "Button1") Then
'do Button1 stuff
End If
'etc.
End Sub
Private Sub addNewButton()
lastButtonIndex = lastButtonIndex + 1
lastLeft = lastLeft + 5
lastTop = lastTop + 5
Dim Button As New Button
With Button
.Name = "Button" + lastButtonIndex.ToString()
.Text = "Button" + lastButtonIndex.ToString()
.Width = 50
.Height = 25
.Left = lastLeft
.Top = lastTop
AddHandler .Click, AddressOf Button_Click
End With
Me.Panel5.Controls.Add(Button)
End Sub
Private Sub ButtonAddButtons_Click(sender As System.Object, e As System.EventArgs) Handles AddButtons.Click
addNewButton()
End Sub
This code will add a new button to the panel every time you click on AddButtons. All the buttons will have an associated Click Event (the same one for all of them): Button_Click. The way to know which button is the current one inside this method is via sender, as shown in the code (you can put as many conditions as buttons. The names are given sequentially starting from 1; but you can take any other property as reference, curButton is the given Button Control).
Bear in mind that one of the problems you have to take care of is the location of the buttons. The code above has a very simplistic X/Y values (Left/Top properties) auto-increase which, logically, will not deliver what you want.
Good day everyone.
I need your help in this project I am into (a Visual Basic program with no database.) It just contains a Datagridview, a Textbox, and three buttons (an "Add" Button, a "Edit" and an "Update" Button).
1 . Is there any way (like using "for loop") to automatically assign DataGridView1.Item("item location") to the one edited and be updated?
2 . Or is it possible to just click an item in the Datagridview then it will be edited at that without passing it to a Textbox, and to be updated at that.
The DataGridViewCellEventArgs variable (e in the method stub the designer will generate for you) of the double click event of the cell has RowIndex and ColumnIndex properties which refer to the position of the cell you clicked.
Save those (in a class variable possibly or a local one if that's all you need) and then refer to them when you update the cell in your DataGridView, possibly like this MyDataGridView.Item(e.ColumnIndex, e.RowIndex) or MyDataGridView.Rows(e.RowIndex).Cells(e.ColumnIndex) where e is the variable from the double click event handler.
For you cell double click event you could have something like this:
Private Sub DataGridView1_CellDoubleClick(sender As Object, e As DataGridViewCellEventArgs) Handles DataGridView1.CellDoubleClick
Using myEditor As New frmCellEditor(Me.DataGridView1.Item(e.ColumnIndex, e.RowIndex).Value)
If myEditor.ShowDialog() = DialogResult.OK Then
Me.DataGridView1.Item(e.ColumnIndex, e.RowIndex).Value = myEditor.NewCellValue
End If
End Using
End Sub
This will call a new instance of your editor and get a value from you. For the purpose of this demo I have made a form like this:
Public Class frmCellEditor
Public NewCellValue As Integer
Public Sub New(ByVal CurrentCellValue As Object)
InitializeComponent()
Me.TextBox1.Text = CStr(CurrentCellValue)
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Me.NewCellValue = CInt(Me.TextBox1.Text)
Me.DialogResult = DialogResult.OK
End Sub
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
Call Me.Close()
End Sub
End Class
Which just has two buttons (Button1 = OK, Button2 = Cancel). When you click OK, it just returns the value 1 which then gets set as the value of the cell.
This is a VERY simplistic example, but it should provide you the basics of what you are trying to do.
UPDATE:
I updated the code for the editor interface so it will include handling for passing the value back and forth from the form with your datagridview.
In your project, make a new form called frmCellEditor. This forms has to have two buttons and a textbox (Make sure that the programmatic names match!). Replace the code with the code listed above. You will have to add Imports System.Windows.Forms above the class as well.
Amend the event handler for the cell double click event of your datagrid to pass the cell value when frmCellEditor is constructed (the line going ... New frmCellEditor(...).
How many columns does your DataGridView has?
Based on how you populate your DataGridView, I'll assume only 1.
Declare this on top of your form
Dim i as Integer
On your btnUpdate_Click Event (Just combine your Edit and Update button into One)
SELECT CASE btnUpdate.Text
Case "Update"
With DataGridView1
'Check if there is a selected row
If .SelectedRows.Count = 0 Then
Msgbox "No Row Selected for Update"
Exit Sub
End If
i = .CurrentRow.Index 'Remember the Row Position
Textbox1.Text = .item(0 ,i).value 'Pass the Value to the textbox
.Enabled = False 'Disable DataGridView to prevent users from clicking other row while updating.
btnUpdate.Text = "Save"
End With
Case Else 'Save
DatagridView1.Item(0,i).Value = Textbox1.Text
btnUpdate.Text = "Update"
END SELECT
Thanks for those who contributed to finding answers for this thread. I have not used your solutions for now (maybe some other time). After some research, I've found an answer for problem 2 (more user friendly at that):
2 . Or is it possible to just click an item in the Datagridview then
it will be edited at that without passing it to a Textbox, and to be
updated at that.
Here's what i did:
in Private Sub Form1_Load, just add:
yourDataGridView.EditMode = DataGridViewEditMode.EditOnEnter
in Private Sub yourDataGridView_(whatever event here: DoubleCellClick, CellContentClick, etc.) add:
DataGridView1(e.ColumnIndex, e.RowIndex).[ReadOnly] = False
DataGridView1.BeginEdit(False)
I'm working in VB2010 and I think I can create a button array in code; however, I'm struggling to then refer to the created buttons individually to code their click events so that they work at runtime.
Any help would be greatly appreciated. I'm fairly new to vb programmimg so go easy on me!!
Give this a try:
' However many buttons you want
Dim numButtons As Integer = 5
Dim ButtonArray(numButtons) as Button
Dim i As Integer = 0
For Each b As Button in ButtonArray
b = new button
AddHandler b.Click, AddressOf Me.ButtonsClick
b.Tag = "b" & i
' You can also set things like button text in here.
i += 1
Next
Private Sub ButtonsClick(sender As Object, e As System.EventArgs)
' sender is the button that has been clicked. You can
' do what you'd like with it, including cast it as a Button.
Dim currButton As Button = CType (sender, Button)
Select Case currButton.Tag
Case "b0":
' This is the first button in the array. Do things!
Case "b1":
' This is the second button in the array. Do things!
Case "b2":
' Notice a pattern?
'...
End Select
End Sub
On one of the button click events insert something like , button2.click which will perform the same action.
Or you may need to look into addHandler.....