Problem with dropdownlist selection RSS

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  timotech

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  60 Posts

  Problem with dropdownlist selection

  Feb 28, 2013 11:26 AM|LINK

  Hi All,

  I have this database bound dropdownlist in an ajax enabled web page, precisely using an update panel, but the problem is that after the dropdownlist is populated and you select an item, it will not select that item, but it will select another item in the same list, the dropdownlist has autopostback set as true. Please what could be the cause of this?

  Thanks

  Tim

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  me_ritz

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  Re: Problem with dropdownlist selection

  Feb 28, 2013 11:36 AM|LINK

  timotech

  I have this database bound dropdownlist in an ajax enabled web page

  How are you binding dropdownlist?

  If it is in code-behind and on page load then make sure it is inside ...

  if(!IsPostBack)
  {
      //DataBind Code Here
  }

  
  
  

  Please mark the post as "Answer" that helps you.
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  Nileshwar

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  17 Posts

  Re: Problem with dropdownlist selection

  Feb 28, 2013 11:39 AM|LINK

  DropDownList1.DataSource = Dataset or DataTable;
  DropDownList1.DataValueField =anyColoumnName1;        //in Dataset or DataTable
  DropDownList1.DataTextField =anyColoumnName2;            //in Dataset or DataTable

  try this

  • Marked as answer by timotech on Mar 01, 2013 10:26 AM
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  timotech

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  60 Posts

  Re: Problem with dropdownlist selection

  Feb 28, 2013 11:41 AM|LINK

  Thanks me_ritz,

  its already wrapped in a if not page.ispostback block

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  timotech

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  60 Posts

  Re: Problem with dropdownlist selection

  Feb 28, 2013 11:42 AM|LINK

  Thanks Nileshwar,

  Ok, i'll try using a datatable instead of using a datareader to get the list.

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  Pengzhen Son...

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  Microsoft

  Re: Problem with dropdownlist selection

  Mar 01, 2013 05:25 AM|LINK

  Hi,

  If you have the UpdatePanel set to update when children fire events, only the UpdatePanel should refresh, not the entire page.  The code below seems to behave similar to what you are seeking.  When changing the drop down, only the update panel posts back to the server and when you refresh the page, you can get the value out of the session.

  form id="form1" runat="server">
      <asp:ScriptManager ID="ScriptManager1" runat="server">
      </asp:ScriptManager>
      <div>
          Current Time: <asp:Label ID="lblTime" runat="server" /><br />
          Session Value: <asp:Label ID="lblSessionValue" runat="server" /><br />
          <br />
          <asp:UpdatePanel ID="upSetSession" runat="server">
              <ContentTemplate>
                  <asp:DropDownList ID="ddlMyList" runat="server"
                      onselectedindexchanged="ddlMyList_SelectedIndexChanged"
                      AutoPostBack="true">
                      <asp:ListItem>Select One</asp:ListItem>
                      <asp:ListItem>Maybe</asp:ListItem>
                      <asp:ListItem>Yes</asp:ListItem>
                  </asp:DropDownList>
              </ContentTemplate>
              <Triggers>
                  <asp:AsyncPostBackTrigger ControlID="ddlMyList"
                      EventName="SelectedIndexChanged" />
              </Triggers>
          </asp:UpdatePanel>
      </div>
  </form>

  protected void Page_Load(object sender, EventArgs e)
      {
          this.lblTime.Text = DateTime.Now.ToShortTimeString();
          if (Session["MyValue"] != null) 
              this.lblSessionValue.Text = Session["MyValue"].ToString();
      }
  
      protected void ddlMyList_SelectedIndexChanged(object sender, EventArgs e)
      {
          Session.Remove("MyValue");
          Session.Add("MyValue", this.ddlMyList.SelectedValue);
      }

  Please refer here

  http://stackoverflow.com/questions/6772403/dropdownlist-and-update-panel

  http://stackoverflow.com/questions/1256943/dropdownlist-in-updatepanel

  http://forums.asp.net/t/1354779.aspx/1

  Hope it can help you.
  
  

  Please mark the replies as answers if they help or unmark if not.
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• • Reply
  

  timotech

  Member

  11 Points

  60 Posts

  Re: Problem with dropdownlist selection

  Mar 01, 2013 10:26 AM|LINK

  Well, i have resorted to using a datatable which works ok for me, but i will explore your suggestion.

   

  Thanks

   

  Tim