DDL Item choice resetting when submitting form RSS

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  LTGoldman

  Member

  64 Points

  92 Posts

  DDL Item choice resetting when submitting form

  Apr 09, 2012 09:49 PM|LINK

  Hello I have a DDL defined as:

  <asp:DropDownList ID="trackerUsers" runat="server"></asp:DropDownList>

  And an ASP Button defined as:

  <asp:Button ID="reportBtn" Text="Run Report" runat="server" OnClick="selectedItemChanged" />

  The Event Handler Function for the button is as follows:

  public void selectedItemChanged(object sender, EventArgs e)
  {
  
  //  Get the value of the currently selected item from the trackerUsers DDL
  String selectedUser = trackerUsers.SelectedValue.ToString();
  
  //  Parse the value of selectedUser to a function within the scope of the SQL namespace / class
  CAR.IDENTITY.user.getName(selectedUser);
  
  }

  Every time I debug and watch the value of selectedUser it always defaults to the first item in the list even when I specifically make an alternative choice.  I think it's something to do with post back or viewstate but I'm not sure.  Can anyone explain what the issue is and confirm how I fix this?
  
  

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  karthicks

  All-Star

  31382 Points

  5424 Posts

  Re: DDL Item choice resetting when submitting form

  Apr 10, 2012 04:26 AM|LINK

  hi, where are you binding the trackerUsers DropDownList .

  if you are binding in Page_load you should do like below .i.e you should not bind the DropDownList on every postback

  if(!Page.IsPostBack){

  trackerUsers.DataSource=ds;

  trackerUsers.DataTextField="Name"; trackerUsers.DataValueField="ID";

  trackerUsers.DataBind();}

  Thanks,
  Karthick S
  • Marked as answer by LTGoldman on Apr 10, 2012 11:21 PM
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  LTGoldman

  Member

  64 Points

  92 Posts

  Re: DDL Item choice resetting when submitting form

  Apr 10, 2012 11:21 PM|LINK

  karthicks

  hi, where are you binding the trackerUsers DropDownList .

  if you are binding in Page_load you should do like below .i.e you should not bind the DropDownList on every postback

  if(!Page.IsPostBack){

  trackerUsers.DataSource=ds;

  trackerUsers.DataTextField="Name"; trackerUsers.DataValueField="ID";

  trackerUsers.DataBind();}

  This was precisely it; many thanks will mark your response as the answer.