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Rank: Newbie
Groups: Member
Joined: 9/11/2007
Posts: 8
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Functionality: someone clicks in productcategory: result set is built up in callbackpanel - additional search options in parameterRepeater - the results for the selected category in catRepeater When pnlMenuCallback is built up, ppl can search deeper in the results through parameterRepeater. I'm totally lost why I can't get the value of the selected dropdownboxes when the trigger (btnParamSearch) makes the panel callback. I have the generated dropdownboxes... so there no problem. But I can't access the selectedValue. It's just always 0. When I remove btnParamSearch as trigger from pnlMenuCallBack all works fine yet I have a refresh of my whole page. And I would like only a refresh of pnlMenuCallback. As info... uc1 is the treeview control. One additional question... how to catch those annoying javascript errors for the callback panel?
Code: HTML/ASPX
<tr>
<td>
<asp:panel id="ProductCatpln" Runat="server">
<uc1:productcategory id="ProductCategory" runat="server"></uc1:productcategory>
</asp:panel>
</td>
<EO:CallbackPanel ID="pnlMenuCallback" runat="server" GroupName="grpCallback" triggers="{ControlID:ProductCategory;Parameter:},{ControlID:btnParamSearch;Parameter:}" OnExecute="CallbackPanelResults_Execute">
<table>
<TR>
<TD>
<TABLE>
<TR>
<asp:repeater id="parameterRepeater" Runat="server">
<ItemTemplate>
<td><table><tr><td>
<asp:Literal ID="parameterLiteral" Runat="server"></asp:Literal>
<asp:Literal ID="PPId" Runat="server" Visible="False"></asp:Literal>
</td></tr>
<tr><td>
<asp:DropDownList ID="parameterVcbo" Runat="server"></asp:DropDownList>
</td></tr></table></td>
</ItemTemplate>
</asp:repeater>
<TD vAlign="baseline"><ASP:LINKBUTTON id="btnParamSearch" runat=server Visible="False" >_Search</ASP:LINKBUTTON></TD>
</TR>
</TABLE>
</TD>
</TR>
<TR>
<TD>
<TABLE>
<asp:panel id="pnlResult" Runat="server" visible="False">
<TR><TD><TABLE>
<asp:Repeater id="catRepeater" Runat="server">
<ItemTemplate>
<tr><td>.....</td></tr>
</ItemTemplate>
</asp:Repeater>
</TABLE></TD></TR>
</asp:panel>
</table>
</TD>
</TR>
</table>
</EO:CallbackPanel>
Thnx for your help.
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Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,194
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Your code looks fine. Since you mentioned about JavaScript error, I would start by identifying and fixing that. In order to catch the error, you want to go to your Internet Explorer -> Options to uncheck "Disable Script Debugging" options. You will then be able to invoke a Script Debugger to get more specific information about the error when it occurs.
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Rank: Newbie
Groups: Member
Joined: 9/11/2007
Posts: 8
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I don't have javascript errors in this specific case. It's just that when btnParamSearch triggers CallbackPanelResults_Execute, it seems it doesn't take the last state of the parameterVcbo dropdownboxes. So it's impossible to find the selectedValues. Perhaps it's an issue with dynamically generated controls? I'm sure, I don't rebuild the parameterVcbo in the code behind.
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Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,194
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Hi, It definitely does have to do with dynamically creating controls. This post explained how view state works in detail: http://www.essentialobjects.com/Forum/Default.aspx?g=posts&t=347Thanks
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Rank: Newbie
Groups: Member
Joined: 9/11/2007
Posts: 8
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I knew you would send me this link... but my controls are buildup... it's just that I can't find the selected value. Even more... when I remove the trigger "btnParamSearch" from the panel and add the onclick event on btnParamSearch itself, it works just fine. But I don't like a complete postback of my page. Moreover... I should build up the parameters in my page_init? Won't this bring the performance down?
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Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,194
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Generally when you want to rebuild the control tree due to view state issues, you should do it inside Page_Init instead of Page_Load. Rebuilding controls tree in Page_Load will get the contents correctly rendered, but it will not resolve the view state issues because the flow is Page_Init -> Load View State -> Page_Load. In another word, Page_Load happens after Load view state, so whatever you do there will not help view state at all.
I don't have an explanation as why it works without trigger though. If you can create a reproducing small sample project that demonstrates the problem, we would be happy to take a look.
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