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04/23/2009 at 05:26AM PDT, ID: 24348617
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9.5

Get value from cascading dropdown list on postback

Asked by cg_medistox in Programming for ASP.NET, .NET Framework 3.x versions, Microsoft Visual Basic.Net

Tags: asp.net, ajax, cascading drop down, drop down, vb.net

I am trying to obtain the value of a drop down list populated client side by a cascading drop down and cannot seem to get the selected vaue

I have seen examples where the cascading drop down is added to page_init to let the page know you want to maintain state but this is doing nothing.

I must say that the whole code is inside a user control if it makes any difference

All I want to do is get the selected value from the drop down??

I am using vb.net, vs 2008, .Net 3.5 SP1. I am using the ajax toolkit from asp.net for the controls and system.web.extensions 3.5 
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'The button that launces the code, this is in the code behind
Public Sub saveProfilePeriod_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles saveProfilePeriodBtn.Click
        Dim CP As New CarProfile
        CP.ContractPeriodID = makeListExtender.SelectedValue
 
        CP.Deposit = carDeposit.Text
        CP.Ongoing = carOngoing.Text
 
        DB.CarProfiles.InsertOnSubmit(CP)
        DB.SubmitChanges()
        newContractPeriodContainer.Update()
 
    End Sub
 
This is the update panel with the cascading drop down in where I can not get the posted value
<asp:UpdatePanel ID="newContractPeriodContainer" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="true">
                    <ContentTemplate>
                    <table class="formTable">
                        <tr>
                            <th>Contract Period: </th>
                            <td><div id="contractDropContainer">
                                    <asp:DropDownList ID="ContractPeriodsDrop" runat="server" />
                                    <cc1:CascadingDropDown ID="contractPeriodExtender" runat="server" />
                            </td>
                            <td><a href="javascript: hideContainer('newContractPeriod')">Add new contract period</a></td>
                        </tr>
                        <tr id="newContractPeriod" style="display:none">
                            <td></td>
                            <td>
                                <asp:TextBox ID="contractPerdiodText" runat="server" class="formSmallTextBox" /> months&nbsp;
                                <asp:button CssClass="btnSave" ID="saveContractPeriod" runat="server" OnClick="saveContractPeriod_Click" Text=" " />
                            </td>
                            <td></td>
                        </tr>
                        </table>
                    
                <table class="formTable">
                    <tr>
                        <th>Profile: </th>
                        <td><div id="profileDropContainer">
                                <asp:DropDownList ID="profilesList" runat="server">
                                
                                </asp:DropDownList>
                                <cc1:CascadingDropDown ID="profileListExtender" ServicePath="~/AdminEventHandlers.asmx" 
                                    ServiceMethod="GetCarProfiles" ParentControlID="ContractPeriodsDrop" TargetControlID="profilesList" PromptText="Select Profile" 
                                    runat="server" Category="Profiles"></cc1:CascadingDropDown>
                            </div>
                        </td>
                        <td><a href="javascript: hideContainer('addProfileContainer')">Add new profile</a></td>
                    </tr>
                    <tr id="addProfileContainer" style="display:none">
                        <td></td>
                        <td>
                            <asp:TextBox ID="carDeposit" runat="server" class="formSmallTextBox" />+
                            <asp:TextBox ID="carOngoing" runat="server" class="formSmallTextBox" />
                            <asp:button CssClass="btnSave" ID="saveProfilePeriodBtn" runat="server" OnClick="saveProfilePeriod_Click" Text=" " />
                        </td>
                        <td></td>
                    </tr>
                </table>
                </ContentTemplate>   
                    <Triggers>
                        <asp:AsyncPostBackTrigger ControlID="saveContractPeriod" />
                        <asp:AsyncPostBackTrigger ControlID="saveProfilePeriodBtn" />
                    </Triggers>     
                </asp:UpdatePanel>
 
'This is the page init where the cascading drop down is loaded, this works from a webservice
 Private Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
 
            contractPeriodExtender.ServicePath = "~/AdminEventHandlers.asmx"
            contractPeriodExtender.TargetControlID = "ContractPeriodsDrop"
            contractPeriodExtender.PromptText = "Select Contract Period"
            contractPeriodExtender.Category = "ContractPeriods"
            contractPeriodExtender.ServiceMethod = "GetContractPeriods"
 
 
    End Sub
 
Keywords: Get value from cascading dropdown li…
Title
1 Multiple DropDownList in ASP.NET usi…
 
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[+][-]04/23/09 06:14 AM, ID: 24214595

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About this solution

Zones: Programming for ASP.NET, .NET Framework 3.x versions, Microsoft Visual Basic.Net
Tags: asp.net, ajax, cascading drop down, drop down, vb.net
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Solution Provided By: GiftsonDJohn
Participating Experts: 2
Solution Grade: A
 
 
[+][-]04/23/09 06:19 AM, ID: 24214647

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[+][-]04/23/09 06:20 AM, ID: 24214655

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