Can NOt AutoPostBack for two DDL

  • Thread starter Thread starter huobazi
  • Start date Start date
H

huobazi

Can NOt AutoPostBack for two DDL
Posted: 07-03-2003 01:35 AM
I have a usercontrol a.ascx ,put two DDL on the ascx.
in an aspx's codebehind Page_Load i use LoadControl to Load the a.ascx
in my aspx,
but the DDL BigClassList can not Post Back and Can not do the event
"BigClassList_SelectedIndexChanged" so the second DDL SmallClassList have no
items
*************************
some ascx code:

"><asp:dropdownlist ID="BigClassList" Width="100" Height="18"
AutoPostBack="True" runat="server"
OnSelectedIndexChanged="BigClassList_SelectedIndexChanged"></asp:dropdownlis
t> &nbsp;&nbsp; <asp:dropdownlist ID="SmallClassList" Width="100"
runat="server"></asp:dropdownlist>
*************************
some ascx's codebehind codes


public void Page_Load(Object sender,EventArgs e)

{

if(!IsPostBack)

{

BigClassDropDownListInit();

SmallClassDropDownListInit();

}

}

public void BigClassDropDownListInit()

{

Conn.Open();

OleDbCommand commBigClass=new OleDbCommand("select
BigClassName,ID from RootClass order by ID",Conn);

OleDbDataReader MyReaderBigClass1=commBigClass.ExecuteReader();

BigClassList.DataSource=MyReaderBigClass1;

BigClassList.DataTextField="BigClassName";

BigClassList.DataValueField="ID";

BigClassList.DataBind();

BigClassList.SelectedIndex = 0;

MyReaderBigClass1.Close();

Conn.Close();

}

public void BigClassList_SelectedIndexChanged(Object sender,EventArgs e)

{

SmallClassDropDownListInit();

}

public void SmallClassDropDownListInit()

{

Conn.Open();

string strCom="select TypeName,ID from Type ";

strCom+=" Where BigClassName ='"+BigClassList.SelectedItem.Text+"' ";

strCom+=" order by ID";

OleDbCommand commSmallClass=new OleDbCommand(strCom,Conn);

OleDbDataReader
MyReaderSmallClass1=commSmallClass.ExecuteReader();

SmallClassList.DataSource=MyReaderSmallClass1;

SmallClassList.DataTextField="TypeName";

SmallClassList.DataValueField="ID";

SmallClassList.DataBind();

SmallClassList.SelectedIndex = 0;

MyReaderSmallClass1.Close();

Conn.Close();

}
 
a uscontrol test.ascx have a dropdownlist web control the dropdownlist's
AutoPostBack property is set "true"
but when i use Loadcontrol("test.ascx") in a aspx fiel's Page_Load event the
dropdownlist which in the ascx can not run good it can not autopostback and
can not call the OnselectedChange event. help me pls~~
 
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