Discuss "Control inside Accordion Content Template" in the .Net Development forum.

richyrich · #1 (**permalink**) June 24th, 2008, 10:47 AM

I am using the accordion ajax control to display data and have bound the accordion to a datasource. Inside the contenttemplate of the accordion I have a few checkboxes. When I try and access these controls on postback I get nothing back from them.

Code:

<ajaxtoolkit:Accordion ID="accord_phase" runat="server" FadeTransitions="false" RequireOpenedPane="false" OnItemDataBound="accord_phase_onitemdatabound" HeaderCssClass="accordionHeader" ContentCssClass="accordionContent">
 
<HeaderTemplate>
<table width="99%" cellpadding="0" cellspacing="0" border="0" class="accordiontblHeader">
<tr><td class="white9b" style="padding:1px 0px 1px 3px;cursor:pointer"><asp:Literal ID="ltl_accord_header" runat="server" Text="Section 1" /></td></tr>
</table>
</HeaderTemplate>
 
<ContentTemplate>
<asp:HiddenField ID="hdn_phaseref" runat="server" />
<table width="99%" cellpadding="0" cellspacing="0" border="0">
<tr id="tr_interest" runat="server">
<td class="frm_req"></td>
<td class="lbl_form">
<asp:Label ID="lbl_interest" Text="Registered Interest" AssociatedControlID="chk_interest" runat="server" CssClass="dblue9b" />
</td>
<td class="txt_form" nowrap="nowrap">
<asp:checkbox ID="chk_interest" runat="server" Checked="true" Enabled="false" />
</td></tr>
<tr id="tr_contact" runat="server">
<td class="frm_req"></td>
<td class="lbl_form">
<asp:Label ID="lbl_contact" Text="Contact Details" AssociatedControlID="chk_contact" runat="server" CssClass="dblue9b" />
</td>
<td class="txt_form" nowrap="nowrap">
<asp:checkbox ID="chk_contact" runat="server" />
</td></tr>
<tr id="tr_initial" runat="server">
<td class="frm_req"></td>
<td class="lbl_form">
<asp:Label ID="lbl_initial" Text="Date & Time for Initial Contact" AssociatedControlID="chk_contact" runat="server" CssClass="dblue9b" />
</td>
<td class="txt_form" nowrap="nowrap">
<asp:checkbox ID="chk_initial" runat="server" />
</td></tr>
</table>
</ContentTemplate>
 
</ajaxtoolkit:Accordion>

When I postback the page I'm using this code to try and retrieve the value in the hdn_phaseref field.

Code:

        For Each item As AjaxControlToolkit.AccordionPane In accord_phase.Panes
            Dim hdn_phaseref As HiddenField = item.ContentContainer.FindControl("hdn_phaseref")

But if I then try and write the value of the hidden field to the screen (hdn_phaseref.value) it just comes up blank.

I've tried googling but can't find any examples using it like this. The page loads exactly as it should and I don't get any errors when loading or on postback.

Is there some way I can access these controls?

jmurrayhead · #2 (**permalink**) June 24th, 2008, 12:15 PM

How are you setting the value of hdn_phaseref? Is the postback having an effect on its value? I haven't yet needed this control, so have no experience with it.

richyrich · #3 (**permalink**) June 24th, 2008, 05:13 PM

I've tried setting it as <%#Eval("phaseref")%> and hdn_phaseref.value =

When I look at the source of the page, the value shows in the hidden field.

I also have a literal control in the header template of the Accordion control and I am able to retrieve the text contained in the literal using
item.FindControl("ltl_accord_phase")

If I change FindControl("hdn_phaseref") to FindControl("jfhfv") I get an object not set to instance error, so it's obviously finding the control, but for some reason it's empty.

I think it must be somehow linked to the HeaderTemplate, but I'm not sure how yet.

jmurrayhead · #4 (**permalink**) June 24th, 2008, 05:18 PM

Try gaining access to the control as explained in this link: AJAX Control Library Accordion Problems - Brian Mains Blog

richyrich · #5 (**permalink**) June 24th, 2008, 05:28 PM

I'm not quite sure how that would work because I'm binding the accordion to a datasource, so I can't call the control using the accordionID.FindControl as there are several instances of the same control and I don't explicitly define the accordion panes, so I can't call ths control using the ID of the pane either.

This seems very strange.

richyrich · #6 (**permalink**) June 24th, 2008, 05:36 PM

OK. I seem to have got somewhere, but no idea if it's anywhere useful!!

I only seem to be able to get a value(text) from a literal control.

All other types of control come back blank....Hmmmm....

Anyone heard of this before?

richyrich · #7 (**permalink**) June 25th, 2008, 04:37 AM

I have found a solution of sorts....Not ideal, but it may have to do for the time being.

I have had to add an update button to the ContentTemplate of the accordion so each pane has it's own update button.

Then I added a CommandName and Argument to the update button:-

Code:

<asp:ImageButton id="img_update" runat="server" ImageURL="link_update.gif" CommandName="Update" CommandArgument='<%#Eval("phaseref")%>' />

Then to the accordion I added the OnItemCommand property to tell it how to action the command:-

Code:

<ajaxtoolkit:accordion id="accord_phase" runat="server" ....... OnItemCommand="update_phase">

And in my update_phase routine:-

Code:

Sub update_phase(ByVal s As Object, ByVal e As CommandEventArgs)
 
If e.CommandName = "Update" then
     Dim accord As AjaxControlToolkit.Accordion = s
     Dim accord_pane As AjaxControlToolkit.AccordionPane = accord.Panes(accord.SelectedIndex)
     Dim phaseref As Integer = e.CommandArgument
     Dim chk_initial As Checkbox = accord_pane.FindControl("chk_initial")
 
End If

Hope that helps someone...

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Discuss "Control inside Accordion Content Template" in the .Net Development forum.

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