Can NOt AutoPostBack for two DDL

[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_SelectedIndex Changed"></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();

}

[huobazi]

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~~


"mike C." <mike@mike.mike> дÈëÏûÏ¢ÐÂÎÅ
:uWHN7FMQDHA.2460@TK2MSFTNGP10.phx.gbl...

> Why don't you put a break point at BigClassList_SelectedIndexChanged() to
> see if program goes there.
>
>
> "huobazi" <huobazi@Aspxboy.com> wrote in message
> news:O$vFMvLQDHA.3880@tk2msftngp13.phx.gbl...

> > 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_SelectedIndex Changed"></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();
> >
> > }
> >
> >

>
>