Custom Templated Control not rendering asp.net controls correctly

8 Apr 2005 6:19 PM

news.microsoft.com

If I have an ASP.net button inside a template for a custom control and use
the code below, everything works fine and it generates the correct id and
the asp.net button calls serverside click event as it should:

_myTemplateContainer = New ContentContainer(Me)
ContentTemplate.InstantiateIn(_myTemplateContainer)
Controls.Add(_myTemplateContainer)

But if I use this code, it does not generate the unique ID and no serverside
event will be called:

Dim SB As New StringBuilder()
Dim SW As New StringWriter(SB)
Dim htmlTW As New HtmlTextWriter(SW)
_myTemplateContainer = New ContentContainer(Me)
ContentTemplate.InstantiateIn(_myTemplateContainer)
_myTemplateContainer.RenderControl(htmlTW)

If Not Me.Page.IsClientScriptBlockRegistered("MainWindow_" & Me.ID) Then
Me.Page.RegisterClientScriptBlock("MainWindow_" & Me.ID, SB.ToString)
End If

The reason I was trying to do it this way is because I need the html of the
template and some other html table code to be output to the top of the html
page no matter where the actual custom control is sited and this was the
only way I could figure out how to do that.

Do you happen to know either of these answers:

1. Is there something else I need to do to get RenderControl to generate
proper ID's for asp.net control that exist on the template I am trying to
render or is that just not possible.
2. Is there another way I can make sure the output of the template always
appears at the top of the page html?

9 Apr 2005 11:41 AM

Teemu Keiski

Hi,

on the second code block, you don't add the template container to the
Controls collection, that's the key part in when Page generates IDs for
controls or when events are handled (for postback events, control would need
to be in Controls collection at Page_Load at the latest)

--
Teemu Keiski
ASP.NET MVP, AspInsider
Finland, EU

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"news.microsoft.com" <kirk.quin***@zywave.com> wrote in message
news:uFUUYeGPFHA.3076@tk2msftngp13.phx.gbl...
> If I have an ASP.net button inside a template for a custom control and use
> the code below, everything works fine and it generates the correct id and
> the asp.net button calls serverside click event as it should:
>
> _myTemplateContainer = New ContentContainer(Me)
> ContentTemplate.InstantiateIn(_myTemplateContainer)
> Controls.Add(_myTemplateContainer)
>
> But if I use this code, it does not generate the unique ID and no
> serverside event will be called:
>
>
> Dim SB As New StringBuilder()
> Dim SW As New StringWriter(SB)
> Dim htmlTW As New HtmlTextWriter(SW)
> _myTemplateContainer = New ContentContainer(Me)
> ContentTemplate.InstantiateIn(_myTemplateContainer)
> _myTemplateContainer.RenderControl(htmlTW)
>
> If Not Me.Page.IsClientScriptBlockRegistered("MainWindow_" & Me.ID) Then
> Me.Page.RegisterClientScriptBlock("MainWindow_" & Me.ID, SB.ToString)
> End If
>
> The reason I was trying to do it this way is because I need the html of
> the template and some other html table code to be output to the top of the
> html page no matter where the actual custom control is sited and this was
> the only way I could figure out how to do that.
>
> Do you happen to know either of these answers:
>
> 1. Is there something else I need to do to get RenderControl to generate
> proper ID's for asp.net control that exist on the template I am trying to
> render or is that just not possible.
> 2. Is there another way I can make sure the output of the template always
> appears at the top of the page html?
>
>