Textbox.text I want to access. And I want it user-configurable before I want to access the altered text.
Dim qbox As New TextBox
qbox.Size = New Size(20, 20)
qbox.Location = New Point(90, 10)
qbox.Parent = addtocart
qbox.Name = "quarts"
qbox.Text = "ss"**
how I dynamically add it inside a series of other dynamic controls:
tile.Controls.Add(addtocart)
flpp.Controls.Add(tile)
tile.Controls.Add(plabel)
tile.Controls.Add(nlabel)
addtocart.Controls.Add(qbox)
How I tried to access it:
qb.Text = CType(Me.Controls("flpp").Controls("tile").Controls("addtocart").Controls("qbox"), TextBox).Text
I generated to textbox at runtime. Of course it's dynamic. I'm new to VB and I'm just experimenting a school project. I wanted the textbox text to be configurable and then access that configured value. I've been brain-cracking for days about this. when I run the thing, I "getObject reference not set to an instance of an object." under NullReferenceException was unhandled" something like this. I don't get it.
WinForms? If yes, and you want to find that control "by name", then use the Controls.Find() function:
Dim ctlName As String = "quarts"
Dim matches() As Control = Me.Controls.Find(ctlName, True)
If matches.Length > 0 AndAlso TypeOf matches(0) Is TextBox Then
Dim tb As TextBox = DirectCast(matches(0), TextBox)
' ... use "tb" somehow ...
Dim value As String = tb.Text
MessageBox.Show(value)
End If
Related
When creating a datagridview in VB.net I cannot get at the cells from anywhere except the Sub where it was made.
I tried placing the code in Form_Load and tried make the Sub Public.
I use Controls.Find, which finds the datagridview, but I cannot access any rows or cells. I can create textbox and label controls and access their text content from anywhere, but not so with the datagridview. This is odd to me.
Using and learning Visual Basic in Visual Studio 2017, for use in my own home business utility.
Dim dgv As New DataGridView
dgv.Location = New Point(2, 200)
dgv.Size = New Size(300, 50)
dgv.Name = "NewDGV"
Dim ColumnTitles() As String = {"ProdId", "Price"}
Dim ColumnWidths() As Integer = {50, 50)
For i = 0 To UBound(ColumnTitles)
Dim col As New DataGridViewTextBoxColumn
col.DataPropertyName = ColumnTitles(i)
col.HeaderText = ColumnTitles(i)
col.Name = ColumnTitles(i)
col.Width = ColumnWidths(i)
dgv.Columns.Add(col)
Next
Controls.Add(dgv)
‘the following sees the datagridview just fine
‘within the same sub
Dim x = dgv.Rows(0).Cells(0).Value
This is how I am creating this control. Perhaps I am Adding to Controls in the wrong way? I am open to better ways to do this.
Dim dgv As DataGridView = CType(Controls("NewDGV"), DataGridView)
dgv.Rows(0).Cells(0).Value = "I found you!"
What this does is find the first Control in the Controls collection, coerces it into a DataGridView type, and assigns it to the variable dgv. You can than manipulate dgv. In this case I put some text in the first cell on the first row.
You could ask the control collection for the instance of your datagridview
Dim MyDgv As DataGridView = Controls.Cast(Of DataGridView).First(Function(dgv) dgv.Name = "NewDGV")
Then work with "MyDGV" properties, methods, and/or events
I have a gridview that contais a textbox in row 0.
I am able to read the textbox with this two instructions:
Dim control As Control = gridview.Rows(0).FindControl("textbox")
Dim valueInTextbox As TextBox = CType(cntrol, TextBox)
My question is, how can I send data to textbox, for example sent the letter "A" to the textbox?. Any suggestion?
I am using this line to try to populate the textbox but my textbox disappear:
gridview.Rows(0).Cells(0).Text = "A"
Thanks.
You can set the text using the following lines:
Dim control As Control = gridview.Rows(0).FindControl("textbox")
If control IsNot Nothing Then
Dim valueInTextbox As TextBox = CType(cntrol, TextBox)
valueInTextbox.Text = "Some Text"
End If
So let's say I have 5 radio buttons on my form.
In my code, I want to check RadioButton3.
I have "RadioButton3" stored in a string variable (RadName)
I can already loop through the controls on the form. How do I go about checking (and actually having the radio button filled in), RadioButton3 when the loop gets to it?
For Each RadioButtn As Control In Me.gbWriteXML.Controls
If (TypeOf RadioButtn Is RadioButton) Then
---code here for checking the radio button---
End If
Next
The .gbWriteXML is a groupbox. Just to avoid any confusion. I was thinking something like:
If RadioButtn.Name = RadName Then
RadName.Checked = True (or .PerformClick for that button)
End If
How can I actually get the control associated with the RadName string, via the control's name?
I need this code to be able to take a radiobutton's name as string hardcoded or entered into the program at runtime, loop until it find the radiobutton with a matching name, then actually taking that radiobutton control, and checking it so it's filled in blue.
Don't loop. Just search for it with Controls.Find() like this:
Dim RadName As String = "RadioButton3"
Dim matches() As Control = Me.Controls.Find(RadName, True)
If matches.Length > 0 AndAlso TypeOf matches(0) Is RadioButton Then
Dim rb As RadioButton = DirectCast(matches(0), RadioButton)
rb.Checked = True
End If
I have multiple TextBox controls Monday that will hold a value. I want to be able to add up all of the Monday textboxes and store that value as monTotal. I am getting an error message that says string cannot be converted to integer.
For i As Integer = 1 To rowCount Step 1
Dim var As Object
var = "txtMonday" & i & ".Text"
monTotal = monTotal + CInt(var)
Next
The way you are attempting to obtain a reference to the text boxes is not idiomatic of VisualBasic .NET.
var = "txtMonday" & i & ".Text" ' this is not a way to obtain a reference to the text box's text
While it would be possible to accomplish something like that using reflection, you'd be much better off refactoring your code to use an array of text boxes.
Since you are probably using Windows Forms you could perhaps implement logic to find the text box control you are interested in on the form using something like this:
' assuming container is the control that contains the text boxes
For Each ctrl In container.Controls
If (ctrl.GetType() Is GetType(TextBox)) Then
If ctrl.Name.StartsWith("txtMonday") Then
Dim txt As TextBox = CType(ctrl, TextBox)
monTotal = monTotal + CInt(txt.Text)
End If
End If
Next
The example above assumes that all the txtMonday.. text boxes are placed inside a control named container. That could be the form itself, or some other panel or table.
If all the textboxes live on the form and there are none being used for other text work you could use this. You could place all the textboxes that contain values your looking for in a separate container and get them like below, but use that control collection.
Dim amount As Double = 0
For Each tb As Textbox In Me.Controls.OfType(Of Textbox)()
amount += Convert.ToDouble(tb.Text)
Next
Dim monTotal as double=0
For Each ctrl As Control In Me.Controls
If TypeOf ctrl Is TextBox AndAlso ctrl.Name.StartsWith("txtMonday") Then
monTotal = monTotal + val(ctrl.Text)
End If
Next
I have a child form that is completely created in code.
I would like to add tool tips to the textbox controls on the form. I know how to set up the tool tips on the fly but can't find a way to add the tooltip control to the form on the fly. All the hits I find on google refer to dragging the control from the designers toolbox.
I would need to do something like:
' Add tool tip control
Dim toolTip1 As New ToolTip()
toolTip1.ShowAlways = True
frm.Controls.Add(toolTip1)
This does not work
I tried adding a sub to handle the from.load event(with a handler that poitn to the sub) at design time but can not get passed the error "Tooltip1 is not declared" when adding the tooltip to the iundividual dynamic controls.
If I call this dynamic form from a parent form and add the tooltip control to the parent form I can use it for the child form. But how would I do this if I was creating the form from a routine that does not live on a parent form?
thanks
Dim frm As New Form
' Add tool tip control
''Dim toolTip1 As New ToolTip()
''toolTip1.ShowAlways = True
'Draw the Form object
'close the dynamic frm if existing already
If frm IsNot Nothing Then
frm.Close()
End If
frm = New Form()
frm.AutoScaleDimensions = New System.Drawing.SizeF(6.0F, 13.0F)
frm.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
frm.Name = "frm_test"
'dimension is irrelevant at the moment
frm.ClientSize = New System.Drawing.Size(10, 10)
'the parent will be the current form
'frm.MdiParent = this;
'splash screen mode form, why not...
frm.ControlBox = True
frm.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
frm.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink
frm.BackColor = System.Drawing.Color.LightGray
For Each item As MYFILE.Class in the Collection
Dim aTextBox As New TextBox()
aTextBox.Font = New System.Drawing.Font(sFont, Single.Parse(sSizeFont), System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CByte(0))
aTextBox.BackColor = System.Drawing.Color.Yellow
aTextBox.Location = New System.Drawing.Point(iNewColumnPosition + 5 + intMaxWidthLabel, intVertPos)
aTextBox.Size = New System.Drawing.Size(intWidthTextBox + 10, intGapHeight)
'store the biggest width, so that the textboxes can be vertically aligned
If intWidthTextBox > intMaxWidthText Then
intMaxWidthText = intWidthTextBox
End If
'giving a name to all your object will be the only way
'to retrieve them and use them
'for the purpose of this sample, the name can be the
'same for all textboxes.
aTextBox.Name = item.ParameterName
'giving the maximun size in caracters for the textbox.
aTextBox.MaxLength = Integer.Parse(item.ParameterLength)
toolTip1.SetToolTip(aTextBox, "TIP" & intIndex.ToString)
'tab have to be ordered
aTextBox.TabIndex = intIndex
intIndex += 1
'Vertical position is to be manage according the
'tallest object in the form, in this case the
'textbox it self
intVertPos += intGapHeight
'adding the textbox to the form
frm.SuspendLayout()
aTextBox.SuspendLayout()
frm.Controls.Add(aTextBox)
Next
I left a lot of code out but this should give you an idea as to what I am doing
In vb it is
Dim tooltip As New ToolTip(components)
tooltip.SetToolTip(textBox1, "This is a textbox tooltip")
Sorry this is not in VB.NET but I am pretty sure you can easily convert this. The first line is to set ToolTip control to your form components. The second is how you set a tooltip to a control and give it the related text.
ToolTip tooltip = new ToolTip(components);
tooltip.SetToolTip(textBox1, "This is a textbox tooltip");