second dropdown get value problem in updatepanel RSS

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  keyvan1

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  272 Posts

  second dropdown get value problem in updatepanel

  Nov 17, 2012 05:07 PM|LINK

  Hi

  I have 2 dropdown in updatepanel the second dropdown is populated by selection of first one

  i cannot get the selectedvalue or text of second dropdownlist .it return the first value always

  i read an article to check it in pageload event but in  my case i do not know how

  here is the code:

   <asp:UpdatePanel ID="UpdatePanel3" runat="server" UpdateMode="Conditional">
                          <ContentTemplate>
           <asp:DropDownList ID="ddlState" runat="server" Width="205px"
                                                              AutoPostBack="True" onselectedindexchanged="ddlState_SelectedIndexChanged"
                                                                Height="20px">
                                                              <asp:ListItem Value="0">----</asp:ListItem>
                                                              <asp:ListItem Value="1">province1</asp:ListItem>
                                                              <asp:ListItem Value="2">province2</asp:ListItem>
                                                                                    </asp:DropDownList>
                                                          <br />
                                                           <asp:DropDownList ID="ddlCity" runat="server" Width="205px" ></asp:DropDownList>
                                                             </ContentTemplate>
                      
                      </asp:UpdatePanel>
  
       Protected Sub ddlState_SelectedIndexChanged(sender As Object, e As System.EventArgs) Handles ddlState.SelectedIndexChanged
          Select Case ddlState.SelectedValue
                  Case "0"
                      If True Then
                          ddlCity.Enabled = False
                          Exit Select
                      End If
                  Case "1"
                      If True Then
  
                          ddlCity.Enabled = True
                          ddlCity.Items.Clear()
                          ddlCity.Items.Add("city")
                          ddlCity.Items.Add("city2")
                          ddlCity.Items.Add("city3")
  
                          Exit Select
                      End If
                  Case "2"
                      If True Then
                          ddlCity.Enabled = True
                          ddlCity.Items.Clear()
                          ddlCity.Items.Add("city4")
                          ddlCity.Items.Add("city5")
                          ddlCity.Items.Add("city6")
  
                          Exit Select
                      End If
  
              End Select
          End Sub

• • Reply
  

  paindaasp

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  Re: second dropdown get value problem in updatepanel

  Nov 18, 2012 05:34 AM|LINK

  If you set AutoPostBack="true" for ddlCity and add a SelectedIndexChanged event for ddlCity, you can get its value there:

  Private Sub ddlCity_SelectedIndexChanged(sender As Object, e As System.EventArgs) Handles ddlCity.SelectedIndexChanged
      Dim ddl2val As String
      ddl2val = ddlCity.SelectedValue
    End Sub

  
  
  

• • Reply
  

  keyvan1

  Member

  86 Points

  272 Posts

  Re: second dropdown get value problem in updatepanel

  Nov 18, 2012 06:26 AM|LINK

  i set the second dropdownlist ddlcity autopostback to true and and set the selected index changed

  it does not work how should i get the value when i submit when i click the button then!!

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  ramiramilu

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  Re: second dropdown get value problem in updatepanel

  Nov 18, 2012 09:46 AM|LINK

  probably something in your Page_load is messing up...debug your code line by line there....page load might be resetting the DDLs...

  thanks,

  Website
  JumpStart
• • Reply
  

  keyvan1

  Member

  86 Points

  272 Posts

  Re: second dropdown get value problem in updatepanel

  Nov 18, 2012 09:49 AM|LINK

  my page_load is empty

  i just have a form on my page with multiple updatepanels and a submit button which gets the values

  i even removed the updatepanel of the two dropdownlists and in that case also i get the first value of second dropdown instead of the actual selected value!!!

  really confused .shoudl i be using the cascading ajax dropdown instead!!!

• • Reply
  

  RameshRajend...

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  Re: second dropdown get value problem in updatepanel

  Nov 18, 2012 12:48 PM|LINK

  http://stackoverflow.com/questions/13095455/unable-to-get-selectedvalue-from-dropdownlist

• • Reply
  

  keyvan1

  Member

  86 Points

  272 Posts

  Re: second dropdown get value problem in updatepanel

  Nov 18, 2012 12:54 PM|LINK

  can u tell me how to bind the second dropdown like the example in the link!!!!

  i am confused

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  RameshRajend...

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  Re: second dropdown get value problem in updatepanel

  Nov 18, 2012 01:03 PM|LINK

  my link dropdowns

  If (IsPostBack)
  {
      ddlSite.Datasource = GetSites();
      ddlSite.Databind();// binding first dropdown
      ddlPlant.DataSource() = GetPlant(ddlSite.SelectedValue);// binding second dropdown
      ddlPlant.Databind();
  }

  
  
  

• • Reply
  

  keyvan1

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  86 Points

  272 Posts

  Re: second dropdown get value problem in updatepanel

  Nov 18, 2012 01:08 PM|LINK

  I saw the codes but my code structure is different!! look at the codes above

  what should i set my datasource to!!!

  my first dropdown is static in my aspx page

  and look at the second code!!

  • Edited by keyvan1 on Nov 18, 2012 01:09 PM
• • Reply
  

  RameshRajend...

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  Re: second dropdown get value problem in updatepanel

  Nov 18, 2012 01:13 PM|LINK

  hmm

  ok u can look another sample

  http://stackoverflow.com/questions/9341640/update-panel-and-dropdown-selected-index-change-issue

  Thank you...