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_S electedIndexCha nged" so the second DDL SmallClassList have no
items
*************** **********
some ascx code:

"><asp:dropdown list ID="BigClassLis t" Width="100" Height="18"
AutoPostBack="T rue" runat="server"
OnSelectedIndex Changed="BigCla ssList_Selected IndexChanged"></asp:dropdownlis
t> &nbsp;&nbsp; <asp:dropdownli st ID="SmallClassL ist" Width="100"
runat="server"> </asp:dropdownlis t>
*************** **********
some ascx's codebehind codes


public void Page_Load(Objec t sender,EventArg s e)

{

if(!IsPostBack)

{

BigClassDropDow nListInit();

SmallClassDropD ownListInit();

}

}

public void BigClassDropDow nListInit()

{

Conn.Open();

OleDbCommand commBigClass=ne w OleDbCommand("s elect
BigClassName,ID from RootClass order by ID",Conn);

OleDbDataReader MyReaderBigClas s1=commBigClass .ExecuteReader( );

BigClassList.Da taSource=MyRead erBigClass1;

BigClassList.Da taTextField="Bi gClassName";

BigClassList.Da taValueField="I D";

BigClassList.Da taBind();

BigClassList.Se lectedIndex = 0;

MyReaderBigClas s1.Close();

Conn.Close();

}

public void BigClassList_Se lectedIndexChan ged(Object sender,EventArg s e)

{

SmallClassDropD ownListInit();

}

public void SmallClassDropD ownListInit()

{

Conn.Open();

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

strCom+=" Where BigClassName ='"+BigClassLis t.SelectedItem. Text+"' ";

strCom+=" order by ID";

OleDbCommand commSmallClass= new OleDbCommand(st rCom,Conn);

OleDbDataReader
MyReaderSmallCl ass1=commSmallC lass.ExecuteRea der();

SmallClassList. DataSource=MyRe aderSmallClass1 ;

SmallClassList. DataTextField=" TypeName";

SmallClassList. DataValueField= "ID";

SmallClassList. DataBind();

SmallClassList. SelectedIndex = 0;

MyReaderSmallCl ass1.Close();

Conn.Close();

}

[huobazi]

Re: Can NOt AutoPostBack for two DDL

a uscontrol test.ascx have a dropdownlist web control the dropdownlist's
AutoPostBack property is set "true"
but when i use Loadcontrol("te st.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 OnselectedChang e event. help me pls~~


"mike C." <mike@mike.mike > дÈëÏûÏ¢ÐÂÎÅ
:uWHN7FMQDHA.24 60@TK2MSFTNGP10 .phx.gbl...[color=blue]
> Why don't you put a break point at BigClassList_Se lectedIndexChan ged() to
> see if program goes there.
>
>
> "huobazi" <huobazi@Aspxbo y.com> wrote in message
> news:O$vFMvLQDH A.3880@tk2msftn gp13.phx.gbl...[color=green]
> > 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[/color]
> a.ascx[color=green]
> > in my aspx,
> > but the DDL BigClassList can not Post Back and Can not do the[/color][/color]
event[color=blue][color=green]
> > "BigClassList_S electedIndexCha nged" so the second DDL SmallClassList[/color][/color]
have[color=blue]
> no[color=green]
> > items
> > *************** **********
> > some ascx code:
> >
> > "><asp:dropdown list ID="BigClassLis t" Width="100" Height="18"
> > AutoPostBack="T rue" runat="server"
> >[/color]
>[/color]
OnSelectedIndex Changed="BigCla ssList_Selected IndexChanged"></asp:dropdownlis[color=blue][color=green]
> > t> &nbsp;&nbsp; <asp:dropdownli st ID="SmallClassL ist" Width="100"
> > runat="server"> </asp:dropdownlis t>
> > *************** **********
> > some ascx's codebehind codes
> >
> >
> > public void Page_Load(Objec t sender,EventArg s e)
> >
> > {
> >
> > if(!IsPostBack)
> >
> > {
> >
> > BigClassDropDow nListInit();
> >
> > SmallClassDropD ownListInit();
> >
> > }
> >
> > }
> >
> > public void BigClassDropDow nListInit()
> >
> > {
> >
> > Conn.Open();
> >
> > OleDbCommand commBigClass=ne w OleDbCommand("s elect
> > BigClassName,ID from RootClass order by ID",Conn);
> >
> > OleDbDataReader MyReaderBigClas s1=commBigClass .ExecuteReader( );
> >
> > BigClassList.Da taSource=MyRead erBigClass1;
> >
> > BigClassList.Da taTextField="Bi gClassName";
> >
> > BigClassList.Da taValueField="I D";
> >
> > BigClassList.Da taBind();
> >
> > BigClassList.Se lectedIndex = 0;
> >
> > MyReaderBigClas s1.Close();
> >
> > Conn.Close();
> >
> > }
> >
> > public void BigClassList_Se lectedIndexChan ged(Object sender,EventArg s e)
> >
> > {
> >
> > SmallClassDropD ownListInit();
> >
> > }
> >
> > public void SmallClassDropD ownListInit()
> >
> > {
> >
> > Conn.Open();
> >
> > string strCom="select TypeName,ID from Type ";
> >
> > strCom+=" Where BigClassName ='"+BigClassLis t.SelectedItem. Text+"' ";
> >
> > strCom+=" order by ID";
> >
> > OleDbCommand commSmallClass= new OleDbCommand(st rCom,Conn);
> >
> > OleDbDataReader
> > MyReaderSmallCl ass1=commSmallC lass.ExecuteRea der();
> >
> > SmallClassList. DataSource=MyRe aderSmallClass1 ;
> >
> > SmallClassList. DataTextField=" TypeName";
> >
> > SmallClassList. DataValueField= "ID";
> >
> > SmallClassList. DataBind();
> >
> > SmallClassList. SelectedIndex = 0;
> >
> > MyReaderSmallCl ass1.Close();
> >
> > Conn.Close();
> >
> > }
> >
> >[/color]
>
>[/color]