Dropdown box stopped working

[jonefer]

Can anyone please suggest things can cause a dropdown box to stop causing a
postback? (besides unchecking the 'enable postback' box)

One of the last things I was doing was creating modalpopup extender panels
which which use update panels that refer to the dropdown box... but I have
wracked my brain trying to figure it out.

It's 4AM and i'm trying to meet a deadline... now I'm finally going to sleep.

 

[Nathan Sokalski]

Do you have the AutoPostBack property set to True (or is that what you meant
by 'enable postback')? Also, is the DropDownList inside an UpdatePanel (and
if it is, what values do you have for the UpdatePanel's properties)? These
are the only things that come to mind for me to check based on what you have
said, although it would probably be helpful to see your code if neither of
these helps.

 

[jonefer]

Yes. AutoPostBack is set to True.
No. The DropDownlist called (cmbPCP) is not inside an update panel.
It used to be. (but I changed it in design)- maybe the 'source' aspx
doesn't match for one reason or another... can you look at this code?

How can I send it to you... it's too large for the posting?

 

[Nathan Sokalski]

I would post as much of the *.aspx file as you think necessary, and the code
inside the Init, Load, and SelectedIndexChanged event handlers, and anything
else you think might be significant. This may be a lot of code to post, but
you're not the first person to need to post a lot of code to a newsgroup
posting. It's really the only way to get people to bother to look at the
code, and sometimes people won't even bother looking at the message period
if a file is attached.

 

[jonefer]

Ok, thank you...

I tried to paste all of it, but I got an error saying the post could only
take so much.

So here are two sections
The section that has the dropdown list - "cmbPCP" is as follows


<td style="font-weight: bold; font-size: x-small; width: 67px; color: black;
font-family: 'Century Gothic'; height: 10px;">
PCP Name:</td>
<td style="width: 90px; height: 10px;">

<aspropDownList ID="cmbPCP" runat="server"
AutoPostBack="True"
DataTextField="ProvName"
DataValueField="ProvID" Style="font-weight: bold; font-size: x-small;
color: black; font-family: 'Century Gothic'"
Width="234px">
</aspropDownList></td>
</tr>
<tr>
<td colspan="2" rowspan="2" style="height: 66px">

<aspetailsView ID="dvProvider" runat="server"
AutoGenerateRows="False" DataSourceID="sdsPCPPanel"
Height="7px" Style="font-weight: normal;
font-size: x-small; color: black; font-family: 'Century Gothic'"
Width="319px" GridLines="None">
<Fields>
<asp:BoundField DataField="RPTPeriod"
HeaderText="Report Period:"
ReadOnly="True"
SortExpression="RPTPeriod" />
<asp:BoundField DataField="ProvID"
HeaderText="PCP Number:" SortExpression="ProvID" />
<asp:BoundField DataField="LocName"
HeaderText="Primary Location:" SortExpression="LocName" />
<asp:BoundField DataField="Specialty"
HeaderText="Department Specialty:" SortExpression="Specialty" />
</Fields>
</aspetailsView>

'=====================================================

Then there are 8 panels just like this one

<aspanel ID="pnlHCC" runat="server" CssClass="modalPopup" Style="display:
none" Height="323px"
Width="685px">
<table style="width: 697px; height: 138px">
<tr>
<td style="width: 100px; height: 5px" valign="top">

<asp:Button ID="btnClose_HCC" runat="server"
Text="Close" />
</td>
</tr>
<tr>
<td style="width: 100px; height: 280px" valign="top">

<asp:UpdatePanel ID="upHCC" runat="server">
<ContentTemplate>
<asp:GridView ID="gvHCC" runat="server"
AllowPaging="True" AllowSorting="True"
AutoGenerateColumns="False" BackColor="White"
BorderColor="#E7E7FF" BorderStyle="None"
BorderWidth="1px" CellPadding="3"
DataSourceID="odsHCC" EmptyDataText="No 'HCC Left to refresh' Data Exists for
this Provider"
GridLines="Horizontal" Width="678px">
<FooterStyle BackColor="#B5C7DE"
ForeColor="#4A3C8C" />
<RowStyle BackColor="#E7E7FF"
ForeColor="#4A3C8C" />
<Columns>
<asp:BoundField DataField="PT_MRN"
HeaderText="PT_MRN" SortExpression="PT_MRN" />
<asp:BoundField DataField="PT_NAME"
HeaderText="PT_NAME" SortExpression="PT_NAME" />
<asp:BoundField DataField="HCC Left To
Refresh" HeaderText="HCC Left To Refresh"
SortExpression="HCC Left To Refresh"
/>
<asp:BoundField DataField="HCC
Description" HeaderText="HCC Description" SortExpression="HCC Description" />
</Columns>
<PagerStyle BackColor="#E7E7FF"
ForeColor="#4A3C8C" HorizontalAlign="Right" />
<SelectedRowStyle BackColor="#738A9C"
Font-Bold="True" ForeColor="#F7F7F7" />
<HeaderStyle BackColor="#4A3C8C"
Font-Bold="True" ForeColor="#F7F7F7" />
<AlternatingRowStyle BackColor="#F7F7F7" />
</asp:GridView>
<asp:ObjectDataSource ID="odsHCC" runat="server"
OldValuesParameterFormatString="original_{0}"
SelectMethod="PercentRefresh"
TypeName="dsListsTableAdapters.tbl_lst_HCCTableAdapter">
<SelectParameters>
<asp:ControlParameter ControlID="cmbPCP"
Name="ProvID" PropertyName="SelectedValue"
Type="String" />
</SelectParameters>
</asp:ObjectDataSource>
</ContentTemplate>
</asp:UpdatePanel>
</td>
</tr>
</table>
<br />

</aspanel>
<ajaxToolkit:ModalPopupExtender ID="mpeHCC" runat="server"
CancelControlID="btnClose_HCC"
PopupControlID="pnlHCC" TargetControlID="lnkHCC">
</ajaxToolkit:ModalPopupExtender>

This panel was the last one I did, so I'm figuring there maybe something
here. Although I don't see anything.

 

[Nathan Sokalski]

What is it that you are expecting to happen when the user makes a new
selection from the DropDownList? I noticed that you do not have any Triggers
specified for the UpdatePanel, which means that only the child controls of
the UpdatePanel will trigger a callback. The DropDownList should still
trigger a postback, but it will not be the same as what would happen when
the DropDownList was a child of the UpdatePanel. You may want to take a look
at the <triggers> element, which goes inside the <UpdatePanel>. I found it
much easier to use the UpdatePanel once I started using Triggers, because it
gave me so much more control over what causes what to happen, without
needing to worry quite as much about which controls were inside the
UpdatePanel. If you have not used the triggers element before, feel free to
ask, and I'm sure there is plenty of help online as well. Good Luck!

 

[jonefer]

I found the problem.
I accidentally used my Dropdownlist as a trigger for one of those Popup
panels.

The trigger for those popup panels is just supposed to be the gridview on
the panel. This prevents the popup from disappearing during the postback.
I had to make 11 of those, and I accidentally used the dropdownlist as a
trigger.
So of course, the rest of the page would never see that event.

I'd like to entertain the idea of using just one UpdatePanel?
Are you saying that if I put the drop down list inside the UpdatePanel
instead of all the othe controls that I want to be asynchronously updated ---
that the same thing will happen?

 

[Nathan Sokalski]

Glad you found the problem. I don't believe I ever suggested using just one
UpdatePanel (if I did, I apologize for the misunderstanding). What I was
suggesting was that you use one UpdatePanel for each area that you may at
some point want updated independently, and anything that you want to trigger
the updating of that UpdatePanel add as a Trigger. For example:

<asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers="false"
UpdateMode="Conditional">
<ContentTemplate>
<asp:TextBox ID="TextBox1" runat="server" AutoPostBack="true"/><br/>
<asp:Button ID="Button1" runat="server" Text="Button"/>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="TextBox1" EventName="TextChanged"/>
<asp:AsyncPostBackTrigger ControlID="Button2" EventName="Click"/>
</Triggers>
</asp:UpdatePanel><br/>
<asp:Button ID="Button2" runat="server" Text="Button"/>

This code contains an UpdatePanel with three controls, two inside and one
outside the UpdatePanel. However, the update is triggered only by one of the
controls inside or the control outside, which shows that you can place
whatever you want inside the UpdatePanel and still select whichever controls
you want as Triggers. Also take note of the UpdatePanel's properties. The
ChildrenAsTriggers="false" tells the UpdatePanel not to use it's children as
triggers unless they are explicitly declared as triggers in the Triggers
section. The UpdateMode="Conditional" says not to update the UpdatePanel on
a regular postback, only when triggered by one of the triggers. As you can
see, this gives you much more control over where you can place controls,
making it much easier to adjust your design without changing functionality.
It can sometimes be useful to have multiple UpdatePanels with the same
Triggers so that you can place controls between the UpdatePanels that are
not updated. If you would like to read more about some of this (I'm not
always good with words when helping people), a wonderful book on ASP.NET
AJAX that includes lots of information on UpdatePanels (and other parts of
ASP.NET AJAX) is:

http://www.microsoft.com/mspress/books/10966.aspx

Good Luck!