Forms Data Controls :: Databinding Dropdownlist Added To Form Via Placeholder?
Mar 31, 2011
I have a formview that has several dropdownlists in the EditItemTemplate. Some of the dropdownlists are added using placeholders. I can add and populate their listitems without any problem. But when I update the record, none of the controls can be found--even though when I look at the page source they are there. I first strated out using asp:ControlParameter in my sqldatasource updateparameters, but even referencing the control as myform$mycontrol did nothing. So then I moved to code behind on the sqldatasource.updating event (code is attached). The only controls I cannot seem to bind to the update are those added via the placeholder.
[Code]....
The item at the dim statement is not an item added using a placeholder and does not get a null reference exception (I used that to prove during debbugging that I wasn't losing my mind)--however, all the items being used to get the parameter values are getting null reference exceptions and are added via placeholders. Here is the code I'm using to set up the dropdownlists:
[Code]....
how to get the value of these controls so they can be used in my update?
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[Code]....
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[Code]....
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[code]....
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[code]....
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<asp:FormView ID="courseUpdateFormView" runat="server" BackColor="White" BorderColor="White" BorderStyle="Ridge" BorderWidth="2px" CellPadding="3" CellSpacing="1" DataKeyNames="CTECourseID" DataSourceID="formviewSqlDataSource" Width="715px">
<FooterStyle BackColor="#C6C3C6" ForeColor="Black" />
<RowStyle BackColor="#DEDFDE" ForeColor="Black" />
<EditItemTemplate>
<table align="center" width="700" border="1" cellpadding="10" cellspacing="2" bgcolor="White">
<%--A whole bunch of textboxes goes here--%>
<tr>
<td bgcolor="#dadada">
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</td>
<td bgcolor="#FCCCCC">
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<asp:DropDownList ID="numHSCreditsDropDownList" runat="server" TabIndex="3" ToolTip="Standards Based districts us the Other form field." ValidationGroup="HSCredits" AppendDataBoundItems="True" OnSelectedIndexChanged="numHSCreditsDropDownList_SelectedIndexChanged">
<asp:ListItem Selected="True" Value="0">--Choose One--</asp:ListItem>
<asp:ListItem>0.5</asp:ListItem>
<asp:ListItem>1.0</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td bgcolor="#dadada">
<strong>Career Cluster:</strong>
</td>
<td bgcolor="#FCCCCC">
<span><font color="red">Note: you must reselect Career Cluster from the list.</font></span><br />
<asp:DropDownList ID="careerCluster" runat="server" AutoPostBack="True" TabIndex="4">
<asp:ListItem Selected="True" Value="0">--Choose One--</asp:ListItem>
<asp:ListItem Value="1">Agriculture, Food & Natural Resources</asp:ListItem>
<asp:ListItem Value="2">Architecture & Construction</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td bgcolor="#dadada">
<strong>Pathways:</strong> <span>(Pathway as defined in the Cluster/Pathway model.)</span>
</td>
<td bgcolor="#FCCCCC">
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<asp:ListBox ID="pathwayListBox" runat="server" DataSourceID="CTECourses" DataTextField="ClusterPathway" DataValueField="ClusterPathway" SelectionMode="Multiple" Style="margin-left: 0px" TabIndex="5" Rows="3">
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WHERE ([ClusterCode] = @ClusterCode)">
<SelectParameters>
<asp:ControlParameter ControlID="careerCluster" Name="ClusterCode" PropertyName="SelectedValue" Type="Int32" />
</SelectParameters>
</asp:SqlDataSource>
</td>
</tr>
<tr>
<td align="center" bgcolor="#4A3C8C" colspan="2">
<asp:Label ID="occupationalStandardsLabel" runat="server" Font-Bold="True" ForeColor="White" Text="Occupational Standards"></asp:Label>
</td>
</tr>
<tr>
<td bgcolor="#dadada">
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</td>
<td bgcolor="#FCCCCC">
<span><font color="red">Note: you must reselect Source of Occupational Standards from the list or enter Other Source of Occupational Standards in the form field provided.</font></span><br />
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</asp:DropDownList>
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<SelectParameters>
<asp:ControlParameter ControlID="careerCluster" Name="TSAClusterID" PropertyName="SelectedValue" Type="Int32" />
</SelectParameters>
</asp:SqlDataSource>
</td>
</tr>
<%--A whole bunch of textboxes, checkboxes and other stuff goes here--%>
<tr>
<td bgcolor="#dadada">
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</td>
<td bgcolor="#FCCCCC">
<span><font color="red">Note: you must reselect Summative Assessment from the list or enter Other Summative Assessment in the form field provided.</font></span><br />
<asp:DropDownList ID="tsaDropDownList" runat="server" AutoPostBack="false" DataSourceID="TSAs" DataTextField="TSA" DataValueField="TSAID" Width="300">
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<asp:SqlDataSource ID="TSAs" runat="server" ConnectionString="<%$ ConnectionStrings:CareerTechEducationConnectionString %>" SelectCommand="SELECT [TSAID], [TSA] FROM [lkTSAs] WHERE ([TSAOrgID] = @TSAOrgID)">
<SelectParameters>
<asp:ControlParameter ControlID="tsaOrgsDropDownList" Name="TSAOrgID" PropertyName="SelectedValue" Type="Int32" />
</SelectParameters>
</asp:SqlDataSource>
</td>
</tr>
<%--A whole bunch of textboxes goes here--%>
<tr>
<td align="center" bgcolor="#dadada">
<asp:Button ID="UpdateButton" runat="server" CausesValidation="True" CommandName="Update" Text="Update" />
<br />
<span><font color="maroon">* All fields except the Tech Prep Information are required.</font></span></div>
</td>
<td align="center" bgcolor="#dadada">
<asp:Button ID="UpdateCancelButton" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel" />
</td>
</tr>
</tr>
</table>
</EditItemTemplate>
</asp:FormView>
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SET HSCredits = @HSCredits, CareerCluster = @CareerCluster, Pathways = @Pathways, TSAOrgs = @TSAOrgs, TSA = @TSA, LastUpdate = GETDATE() WHERE (CTECourseID = @CTECourseID)">
<SelectParameters>
<asp:SessionParameter Name="CTECourseID" SessionField="CTECourseID" Type="Int32" />
</SelectParameters>
<UpdateParameters>
<asp:FormParameter FormField="numHSCreditsDropDownList" Name="HSCredits" Type="String" />
<asp:FormParameter FormField="HSCreditsOtherTextBox" Name="HSCreditsOther" Type="String" />
<asp:FormParameter FormField="careerCluster" Name="CareerCluster" Type="Int32" />
<asp:FormParameter FormField="pathwayListBox" Name="Pathways" Type="String" />
<asp:FormParameter FormField="tsaOrgsDropDownList" Name="TSAOrgs" Type="Int32" />
<asp:FormParameter FormField="tsaDropDownList" Name="TSA" Type="String" />
<asp:FormParameter FormField="TSAOtherTextBox" Name="TSAOther" Type="String" />
</UpdateParameters>
</asp:SqlDataSource>
In the codebehind I've tried to set selectedvalue to session variable upon selected index changed like this:
Protected Sub numHSCreditsDropDownList_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs)
Session("HSCredit") = DirectCast(courseUpdateFormView.FindControl("numHSCreditsDropDownList"), DropDownList).SelectedValue
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