add control in literal

[nickyboy]

if want to control if a statement is true or false in a literal, depanding on this the page should display an 'x' or a button

the x is already working but the button isn't, probably because it is serverside
i tried 2 ways to display the button but none worked...

the literal is inside a listview

does anyone know how i can get the button on the page?

here's my code:

<ItemTemplate runat="server">
<tr id="row" runat="server">
<td> <a href=<%# "detailrooster.aspx?DagID=" & Eval("DagID") %>><%#Eval("Datum").ToString.Substring(0, 9)%></a> </td>

<td> <%#Eval("Uur")%></td>
<td> <%#Eval("Naam")%></td>
<td align="center"><asp:Literal ID="LiteralBevestigd" runat="server" /> </td>
<td align="center"><asp:Literal ID="LiteralAfgekeurd" runat="server" /> </td>

</tr>

</ItemTemplate>


Private Sub Listview1_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ListViewItemEventArgs)
Dim LiteralBevestigd As Literal = e.Item.FindControl("LiteralBevestigd")
Dim LiteralAfgekeurd As Literal = e.Item.FindControl("LiteralAfgekeurd")
'dim myliteral as literal = CTYPE(sender,listview1)
Dim lvdiContainer As ListViewDataItem = CType(LiteralBevestigd.NamingContainer, ListViewDataItem)
Dim bevestigd As String = DataBinder.Eval(lvdiContainer.DataItem, "Bevestigd").ToString()
Dim afgekeurd As String = DataBinder.Eval(lvdiContainer.DataItem, "Afgekeurd").ToString()




If afgekeurd.Equals("False") And bevestigd.Equals("False") Then

LiteralAfgekeurd.Text &= String.Format(" <asp:Button ID=" & Chr(34) & "Button1" & Chr(34) & "runat=" & Chr(34) & "server" & Chr(34) & " Text=" & Chr(34) & "Button" & Chr(34) & " onclick=" & Chr(34) & "Button1_Click" & Chr(34) & "/> ", e.Item.ID)
LiteralBevestigd.Text &= "<asp:Button ID='Button2'runat='server' Text='Button' onclick='Button1_Click'/> "


Else

If bevestigd.Equals("True") Then
LiteralBevestigd.Text &= "x"
Else
LiteralAfgekeurd.Text &= "x"
End If

End If

End Sub

 

[kulrom]

How to add the button to Listview programtically

Hello and welcome to the forum.

That's correct guess. You cannot add a server control in this way.
Even if you add it syntactically correct (see below) it will not show up again.

LiteralBevestigd.Text &= "<asp:Button ID=""Button2"" runat=""server"" Text=""Button"" onclick=""Button1_Click"" />"

Rather, you should instantiate a new button object and add to the controls collection.

Dim button1 As New Button
button1.ID = "Button2"
button1.Text = "Button"
AddHandler button1.Click, AddressOf Button1_Click

'You may now add the button at the place you want it to appear
e.g. (rough example)
Listview1.FindControl("LiteralAfgekeurd").Controls.Add(button1)

Hope this helps

 

[nickyboy]

hint looks pretty good but i get the next exception

Object reference not set to an instance of an object.

the code i have:

Dim LiteralBevestigd As Literal = e.Item.FindControl("LiteralBevestigd")
Dim LiteralAfgekeurd As Literal = e.Item.FindControl("LiteralAfgekeurd")
'dim myliteral as literal = CTYPE(sender,listview1)
Dim lvdiContainer As ListViewDataItem = CType(LiteralBevestigd.NamingContainer, ListViewDataItem)
Dim bevestigd As String = DataBinder.Eval(lvdiContainer.DataItem, "Bevestigd").ToString()
Dim afgekeurd As String = DataBinder.Eval(lvdiContainer.DataItem, "Afgekeurd").ToString()

Dim button1 As New Button
button1.ID = "Button2"
button1.Text = "Button"
AddHandler button1.Click, AddressOf Button1_Click

'You may now add the button at the place you want it to appear e.g. (rough example)



If afgekeurd.Equals("False") And bevestigd.Equals("False") Then
ListView1.FindControl("LiteralAfgekeurd").Controls.Add(button1)

 

[nickyboy]

solved that one; next problem:

'System.Web.UI.WebControls.Literal' does not allow child controls.

code:

Dim LiteralBevestigd As Literal = e.Item.FindControl("LiteralBevestigd")
Dim LiteralAfgekeurd As Literal = e.Item.FindControl("LiteralAfgekeurd")
'dim myliteral as literal = CTYPE(sender,listview1)
Dim lvdiContainer As ListViewDataItem = CType(LiteralBevestigd.NamingContainer, ListViewDataItem)
Dim bevestigd As String = DataBinder.Eval(lvdiContainer.DataItem, "Bevestigd").ToString()
Dim afgekeurd As String = DataBinder.Eval(lvdiContainer.DataItem, "Afgekeurd").ToString()

Dim button1 As New Button
button1.ID = "Button2"
button1.Text = "Button"
AddHandler button1.Click, AddressOf Button1_Click

If afgekeurd.Equals("False") And bevestigd.Equals("False") Then
Dim sting As String = button1.Text

LiteralAfgekeurd.Controls.Add(button1)

 

[kulrom]

Oh no, that was just a rough example.
Of course Literal control doesn't allow child controls. It is not intended for nesting controls.
Rather you can use panel control, placeholder control .. or anything else that allows you to nest controls.