Hosting controls in a custom server control

**=?Utf-8?B?YnJ1Y2UgYmFya2Vy?=** · Mar 17 '08, 03:55 PM

RE: Hosting controls in a custom server control

when do you call Setup_Control() (and why do you have it?). it must be called
in oninit of the page, or better yet, change it to CreateChildCont rols.

-- bruce (sqlwork.com)

"jbeckh2@gmail. com" wrote:

Hi,
>
I am trying to create a custom server control that contains several
dropdownlists. The control looks like this:
>
Dim pnlHeader As New Panel
>
Protected Overrides Sub RenderContents( ByVal writer as HtmlTextWriter)
pnlHeader.Rende rControl(writer )
End Sub
>
Public Sub Setup_Control()
Dim table As New HtmlControls.Ht mlTable
table.Attribute s.Add("style", "width:100% ")
pnlHeader.Contr ols.Add(table)
>
Dim row As New HtmlControls.Ht mlTableRow
>
Dim cellLabel As New HtmlControls.Ht mlTableCell
cellLabel.Width = "60%"
Dim lblProblems As New Label
lblProblems.ID = "lbl" & Category.Proble mTypeId
lblProblems.Tex t = "Choose Vendor for All " &
Category.Proble mType & " Problems."
cellLabel.Contr ols.Add(lblProb lems)
>
Dim cellDDL As New HtmlControls.Ht mlTableCell
cellDDL.Width = "30%"
Dim ddlAll As New DropDownList
ddlAll.ID = "ddlVendorForAl l" &
Category.Proble mTypeId.ToStrin g()
ddlAll.AutoPost Back = True
Common.FillList (ddlAll, HeatMapData.Get Vendors(Propert yId,
"[Choose a Vendor]"))
cellDDL.Control s.Add(ddlAll)
listDDL.Add(ddl All)
AddHandler ddlAll.Selected IndexChanged, AddressOf
ddlAll_Selected IndexChanged
>
Dim cellImage As New HtmlControls.Ht mlTableCell
cellImage.Width = "9%"
Dim imgExpand As New WebControls.Ima ge
imgExpand.ID = "imgExpand" &
Category.Proble mTypeId.ToStrin g()
imgExpand.Image Url = "~/images/icons/118.png"
imgExpand.ToolT ip = "View Details"
>
>
Dim imgCollapse As New WebControls.Ima ge
imgCollapse.ID = "imgCollaps e" &
Category.Proble mTypeId.ToStrin g()
imgCollapse.Ima geUrl = "~/images/icons/116.png"
imgCollapse.Too lTip = "Hide Details"
imgCollapse.Att ributes.Add("st yle", "display:no ne")
>
cellImage.Contr ols.Add(imgExpa nd)
cellImage.Contr ols.Add(imgColl apse)
>
row.Controls.Ad d(cellLabel)
row.Controls.Ad d(cellDDL)
row.Controls.Ad d(cellImage)
table.Rows.Add( row)
>
pnlHeader.BackC olor = Drawing.Color.F romArgb(255, 206,
204, 204)
End Sub
>
Protected Sub ddlAll_Selected IndexChanged(By Val sender As Object,
ByVal e As System.EventArg s)
....
End Sub
>
>
The control renders fine. The problem I am having is that the
dynamically created dropdownlist (ddlAll) does not fire the
SelectedIndexCh anged event. What am I missing?
>
Thanks,
Jeremy
>

**jbeckh2@gmail.com** · Mar 17 '08, 04:05 PM

Re: Hosting controls in a custom server control

The controls are added to a panel that is displayed after a button is
clicked on page. I set properties on the control and then call
Setup_Control creates all of the child controls on the button click.

On Mar 17, 10:45 am, bruce barker
<brucebar...@di scussions.micro soft.comwrote:

when do you call Setup_Control() (and why do you have it?). it must be called
in oninit of the page, or better yet, change it to CreateChildCont rols.
>
-- bruce (sqlwork.com)
>
"jbec...@gmail. com" wrote:

Hi,

>

I am trying to create a custom server control that contains several
dropdownlists. The control looks like this:

>

Dim pnlHeader As New Panel

>

Protected Overrides Sub RenderContents( ByVal writer as HtmlTextWriter)
pnlHeader.Rende rControl(writer )
End Sub

>

Public Sub Setup_Control()
Dim table As New HtmlControls.Ht mlTable
table.Attribute s.Add("style", "width:100% ")
pnlHeader.Contr ols.Add(table)

>

Dim row As New HtmlControls.Ht mlTableRow

>

Dim cellLabel As New HtmlControls.Ht mlTableCell
cellLabel.Width = "60%"
Dim lblProblems As New Label
lblProblems.ID = "lbl" & Category.Proble mTypeId
lblProblems.Tex t = "Choose Vendor for All " &
Category.Proble mType & " Problems."
cellLabel.Contr ols.Add(lblProb lems)

>

Dim cellDDL As New HtmlControls.Ht mlTableCell
cellDDL.Width = "30%"
Dim ddlAll As New DropDownList
ddlAll.ID = "ddlVendorForAl l" &
Category.Proble mTypeId.ToStrin g()
ddlAll.AutoPost Back = True
Common.FillList (ddlAll, HeatMapData.Get Vendors(Propert yId,
"[Choose a Vendor]"))
cellDDL.Control s.Add(ddlAll)
listDDL.Add(ddl All)
AddHandler ddlAll.Selected IndexChanged, AddressOf
ddlAll_Selected IndexChanged

>

Dim cellImage As New HtmlControls.Ht mlTableCell
cellImage.Width = "9%"
Dim imgExpand As New WebControls.Ima ge
imgExpand.ID = "imgExpand" &
Category.Proble mTypeId.ToStrin g()
imgExpand.Image Url = "~/images/icons/118.png"
imgExpand.ToolT ip = "View Details"

>

Dim imgCollapse As New WebControls.Ima ge
imgCollapse.ID = "imgCollaps e" &
Category.Proble mTypeId.ToStrin g()
imgCollapse.Ima geUrl = "~/images/icons/116.png"
imgCollapse.Too lTip = "Hide Details"
imgCollapse.Att ributes.Add("st yle", "display:no ne")

>

cellImage.Contr ols.Add(imgExpa nd)
cellImage.Contr ols.Add(imgColl apse)

>

row.Controls.Ad d(cellLabel)
row.Controls.Ad d(cellDDL)
row.Controls.Ad d(cellImage)
table.Rows.Add( row)

>

pnlHeader.BackC olor = Drawing.Color.F romArgb(255, 206,
204, 204)
End Sub

>

Protected Sub ddlAll_Selected IndexChanged(By Val sender As Object,
ByVal e As System.EventArg s)
....
End Sub

>

The control renders fine. The problem I am having is that the
dynamically created dropdownlist (ddlAll) does not fire the
SelectedIndexCh anged event. What am I missing?

>

Thanks,
Jeremy

**=?Utf-8?B?YnJ1Y2UgYmFya2Vy?=** · Mar 17 '08, 05:05 PM

Re: Hosting controls in a custom server control

but then on postback you need to recreate the control (and its children) in
the oninit event so it can receive the postback data and fire the onchange
event. you can store in viewstate a flag to determine if this must be done.

-- bruce (sqlwork.com)

"jbeckh2@gmail. com" wrote:

The controls are added to a panel that is displayed after a button is
clicked on page. I set properties on the control and then call
Setup_Control creates all of the child controls on the button click.
>
On Mar 17, 10:45 am, bruce barker
<brucebar...@di scussions.micro soft.comwrote:

when do you call Setup_Control() (and why do you have it?). it must be called
in oninit of the page, or better yet, change it to CreateChildCont rols.

-- bruce (sqlwork.com)

"jbec...@gmail. com" wrote: