I have a bunch panels on a page. panel1, panle2 ..., I want to make a panel visible based on a querystring. Ived tried:
Dim s As String
s = Request.QueryString("s")
Dim p As Panel = CType(Me.Controls(s), Panel)
p.Visible = True
This doesn't work. Maybe there is a whole different way to go about it.
Thanks.
If you're passing actual Panel ID (e.g. http://mysite.com/page.aspx?s=panel1), you should use 'FindControl' method:
Dim p As Panel = CType(Me.FindControl(s), Panel)
Related
i'm adding a panel like this to my web application:
For i = 1 To amountOfRechnungspositionen + 1
Dim pnlPositon As Panel = New Panel
pnlPositon.ID = "pnlPositon" & i
pnlRechungsposition.Controls.Add(pnlPositon)
...
Next
Now if i onclick a button, i want to delete this panel.
This is my code.
Private Sub imgDelRechnungsPosition_Click(sender As Object, e As ImageClickEventArgs) Handles imgDelRechnungsPosition.Click
amountOfRechnungspositionen = Convert.ToInt32(hfAmountofRechnungspositionen.Value)
Dim fcpnlPositon As Panel = DirectCast(pnlRechungsposition.FindControl("placeholderID$pnlPositon" + amountOfRechnungspositionen.ToString()), Panel)
fcpnlPositon.Dispose()
hfAmountofRechnungspositionen.Value = Convert.ToString(amountOfRechnungspositionen - 1)
End Sub
But fcpnlPositon is Nothing.
Waht i'm doing wrong?
Thank u, for reading.
Try using:
CType(pnlRechungsposition.FindControl("pnlPositon" +
amountOfRechnungspositionen.ToString()), Panel)
The placeholder text is only for client-side markup and thus you want to use the direct ID property.
I need to go through a loop and check the proper radiobutton. I have multiple radio button named rb with a color such as "rbGreen, rbRed, rbYellow..."
Here is my code behind: (listColors is a list of strings)
Private Sub selectColor(color As String)
Dim i As Integer
For i = 0 To listColors.Count - 1
If listColors(i) = color Then
Dim rb As RadioButton = TryCast(Page.FindControl("rb" & color), RadioButton)
rb.Checked = True
End If
Next i
End Sub
While debugging, I got an error because rb is nothing...
My guess is that the RadioButtons in question are not actually part of the Page, and are instead part of a UserControl or template based control (such as a Repeater).
If so, then you need to modify your code to use the FindControl of the control that holds the RadioButtons in question.
If this is within a UserControl the easiest thing to do is something like...
Me.FindControl("rb" & color)
I have a User Control which returns a table of data, which in some cases needs to be looped, displaying one on top of another.
I am able to dynamically add a single instance of this by placing a fixed placeholder in the page.
I am now trying to work out how to add more than one, given that I don't know how many might be needed I don't want to hard code the Placeholders.
I've tried the following, but I am just getting one instance, presumably the first is being overwritten by the second
My HTML
<div id="showHere" runt="server"/>
VB
Dim thisPh As New PlaceHolder
thisPh.Controls.Add(showTable)
showHere.Controls.Add(thisPh)
Dim anotherPh As New PlaceHolder
anotherPh .Controls.Add(showTable)
showHere.Controls.Add(anotherPh)
How do I make it add repeated tables within the showHere div?
I would advise generating a different ID for each of your table. For example,
Dim i As Integer
i = 0
For each tbl in ShowTables
tbl.ID = "MyTab" + i.ToString()
i = i + 1
showHere.Controls.Add(tbl)
showHere.Controls.Add(New LiteralControl("<br />"))
Next
On other hand, it would make more sense to have a your user/custom control generate html for a single table and then nest your user/custom control within a repeater (or similar control such as ListView etc).
Did you tried simply, this:
For each tbl in ShowTables
showHere.Controls.Add(tbl)
showHere.Controls.Add(New LiteralControl("<br />"))
Next
After fussing with this issue myself, I stumbled across below solution.
On button click()
LocationDiv.Visible = True
Dim existingItems As New List(Of Object)
If Not Session("existingItems") Is Nothing Then
existingItems = CType(Session("existingItems"), List(Of Object))
For Each item As Object In existingItems
LocationDiv.Controls.Add(item)
Next
existingItems.Clear()
End If
LocationDiv.Controls.Add(New LiteralControl("<b>" & Text & "</b>"))
For Each item As Object In LocationDiv.Controls
existingItems.Add(item)
Next
Session.Add("existingItems", existingItems)
I have an ASP project which references a WCF service. Does exactly half of what I need.
A button on the page calls a function from the WCF, which returns a list of objects (variable names). When returned, the vb code dynamically adds textboxes to a panel on the page. Like this:
For Each LetterVariables In LetterVarList
tb = New TextBox
lb = New Label
lb.Text = LetterVariables._key & " "
tb.ID = LetterVariables._key
pnlVars.Controls.Add(lb)
pnlVars.Controls.Add(tb)
Dim LineBreak As LiteralControl = New LiteralControl("<br />")
pnlVars.Controls.Add(LineBreak)
Next
Now the problem is, after this is finished the user will enter some values into those texboxes. I (somehow) need to reference those texboxes to snag the values when a user clicks another button.
How can I do this?
Thanks,
Jason
You can give the TextBox an ID which you could use FindControl to retrieve.
tb.ID = "txt" + LetterVariables._key.ToString();
Then when you want to reference it.
TextBox txtBox = (TextBox)FindControl("txt" + someKey);
Something like that might work for you.
Don't forget to recreate the controls on post back BEFORE the controls are loaded with the posted values.
i want to create a modalpopup dynamically but i come across a problem.I pasted my sub here and i dont know what to do for that problem.When i want to show modalpopup,it says
"Control 'mdldelete2' of type 'ModalPopupExtender' must be placed inside a form tag with runat=server." How can i solve this?
Public Sub Raise_Alarm(ByRef p_Page As Page,
ByRef p_AssignedButton As System.Web.UI.WebControls.Button,
ByVal p_Message As String)
Dim mdldelete2 As Global.AjaxControlToolkit.ModalPopupExtender =
p_Page.Page.FindControl("mdldelete2")
If mdldelete2 Is Nothing Then
mdldelete2 = New Global.AjaxControlToolkit.ModalPopupExtender
End If
With mdldelete2
.TargetControlID = p_AssignedButton.ID
.PopupControlID = "pnlDelete"
.ID = "mdldelete2"
.BackgroundCssClass = "modalBackground"
.OkControlID = "btnDeleteOk"
.CancelControlID = "btnDeleteCancel"
End With
p_Page.Controls.Add(mdldelete2)
Dim mylabel As Label
mylabel = p_Page.FindControl("lblStatus")
mylabel.Text = p_Message
mdldelete2.Show()
End Sub
Really, you should be adding the mdldelete2 control to the Controls collection of the Form control, rather than the Page directly - that might help.
I often find it's easier to add a PlaceHolder control to the page for this sort of thing - it doesn't add anything directly to the page, but gives you a named container to find and add controls to.
Also, just a point - if you did find an instance of the control with the Page.FindControl method, then you don't need to add it to a form collection again, as it's already in there.
Looks like you need to add a ScriptManager control to the aspx
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>