Hi,
I was under the impression that, when ASP rendered a page,
it recursively traversed the hierarchy, executing all controls
in each ControlCollecti on of every control in that hierarchy.
I tried adding a Button control to a TextBox ControlCollecti on,
and it didn't execute. When I add the control to the Placeholder
ControlCollecti on (after the TextBox control is added), it executes
without any problem:
/* . . . . . . . . . . . . . . . . */
protected void create_ctrl_pai r_0x
(String text_box_id, String Btn_ID, String Btn_text)
{
ControlCollecti on crnt_ctrl = CCP_Dyn_Ctrl_Pl aceholder.Contr ols;
// Create UserTextBox TextBox control.
UserTextBox0x = new TextBox ();
// Configure the UserTextBox TextBox control.
UserTextBox0x.I D = text_box_id;
// Add UserTextBox TextBox control to the Controls collection
// of the Dyn_Control_Pla ceholder PlaceHolder control.
crnt_ctrl.Add (UserTextBox0x) ;
crnt_ctrl.Add ( new LiteralControl( "<br>XxXxXxXxXx XxXxXxX<br><br> ") );
// Create and initialize a Button.
button0x = new Button();
button0x.ID = Btn_ID;
button0x.Text = Btn_text;
// make the button a child of the text box control.
crnt_ctrl = UserTextBox0x.C ontrols;
crnt_ctrl.Add (button0x);
crnt_ctrl.Add
( new LiteralControl( "<br>========== =========<br><b r>") );
}
/* . . . . . . . . . . . . . . . . */
/* | | | | | | | | | | | | | | | | */
/* . . . . . . . . . . . . . . . . */
If this assignment statement is removed from the above:
crnt_ctrl = UserTextBox0x.C ontrols;
... it works fine. Otherwise, there is no button, as the child is neglected.
Can anyone give me an idea as to what I would have to do to make this work?
My complete code is as follows:
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<%@ Page Language="C#" AutoEventWireup ="True" %>
<html>
<head>
<script runat="server">
/* -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- */
/* -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- */
// protected class sys_obj_class
public class sys_obj_class
{
private Page this_page01;
public Page Get_this_page01
{ get { return this_page01; } }
private PlaceHolder Obj_Dyn_Ctrl_Pl aceholder;
public PlaceHolder Get_Obj_Dyn_Ctr l_Placeholder
{ get { return Obj_Dyn_Ctrl_Pl aceholder; } }
private Label Obj_Dyn_Label01 ;
public Label Get_Obj_Dyn_Lab el01
{ get { return Obj_Dyn_Label01 ; } }
public sys_obj_class
(PlaceHolder Dyn_Ctrl_Placeh older, Label Dyn_Label)
{
this_page01 = Dyn_Ctrl_Placeh older.Page;
Obj_Dyn_Ctrl_Pl aceholder = Dyn_Ctrl_Placeh older;
Obj_Dyn_Label01 = Dyn_Label;
}
}
/* ------------------------------------------------------------------ */
/* ------------------------------------------------------------------ */
public void Page_Init (object sender, EventArgs e)
{
int ndx = 2;
Dyn_Control_Pla ceholder.Contro ls.Add
( new LiteralControl( "<br>||| added 1 on init |||<br><br>") );
}
/* ------------------------------------------------------------------ */
/* ------------------------------------------------------------------ */
protected void Page_Load (Object sender, EventArgs e)
{
PlaceHolder plc_hldr = (PlaceHolder) FindControl ("Dyn_Control_P laceholder");
Label lbl_msg01 = (Label) FindControl ("Message01" );
sys_obj_class sys_obj = new sys_obj_class (plc_hldr, lbl_msg01);
ctrl_pair_creat ion_01 ccp1 = new ctrl_pair_creat ion_01 (sys_obj);
ccp1.create_ctr l_pair_01 ();
}
/* ------------------------------------------------------------------ */
/* ------------------------------------------------------------------ */
/* - - - - - - - - - - - - - - - - - - - - - - */
/* - - - - - - - - - - - - - - - - - - - - - - */
/* - - - - - - - - - - - - - - - - - - - - - - */
protected class base_create_ctr l_pair
{
protected TextBox UserTextBox0x;
protected Button button0x;
protected PlaceHolder CCP_Dyn_Ctrl_Pl aceholder;
protected Label Dyn_Lbl_msg01;
/* =#=#=#=#=#=#=#= #=#=#=#=#=#=#=# =#=#=#=#=#=#=#= #=#=#=#=#=#=#=# =#= *
<<< constructor >>>
* =#=#=#=#=#=#=#= #=#=#=#=#=#=#=# =#=#=#=#=#=#=#= #=#=#=#=#=#=#=# =#= */
protected base_create_ctr l_pair (sys_obj_class sys_obj)
{
CCP_Dyn_Ctrl_Pl aceholder = sys_obj.Get_Obj _Dyn_Ctrl_Place holder;
Dyn_Lbl_msg01 = sys_obj.Get_Obj _Dyn_Label01;
}
/* =#=#=#=#=#=#=#= #=#=#=#=#=#=#=# =#=#=#=#=#=#=#= #=#=#=#=#=#=#=# =#= */
/* =#=#=#=#=#=#=#= #=#=#=#=#=#=#=# =#=#=#=#=#=#=#= #=#=#=#=#=#=#=# =#= */
protected void init_single_lin e_text_box (TextBox new_TextBox, int col_sz)
{ new_TextBox.Col umns = col_sz; }
/* . . . . . . . . . . . . . . . . */
protected void create_ctrl_pai r_0x
(String text_box_id, String Btn_ID, String Btn_text)
{
ControlCollecti on crnt_ctrl = CCP_Dyn_Ctrl_Pl aceholder.Contr ols;
// Create UserTextBox TextBox control.
UserTextBox0x = new TextBox ();
// Configure the UserTextBox TextBox control.
UserTextBox0x.I D = text_box_id;
// Add UserTextBox TextBox control to the Controls collection
// of the Dyn_Control_Pla ceholder PlaceHolder control.
crnt_ctrl.Add (UserTextBox0x) ;
crnt_ctrl.Add ( new LiteralControl( "<br>XxXxXxXxXx XxXxXxX<br><br> ") );
// Create and initialize a Button.
button0x = new Button();
button0x.ID = Btn_ID;
button0x.Text = Btn_text;
// make the button a child of the text box control.
crnt_ctrl = UserTextBox0x.C ontrols;
crnt_ctrl.Add (button0x);
crnt_ctrl.Add
( new LiteralControl( "<br>========== =========::::<b r><br>") );
}
/* . . . . . . . . . . . . . . . . */
/* -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- *
<<< Button Click Handlers >>>
* -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- */
private String submit_click_st r01 = "The TextBox";
private String submit_click_st r02
= " control above is dynamically generated. <br> You entered: ";
public void Submit_Click (Object sender, EventArgs e)
{ // Retrieve the UserTextBox TextBox control from the
Dyn_Control_Pla ceholder
// PlaceHolder control.
TextBox TempTextBox = (TextBox)
CCP_Dyn_Ctrl_Pl aceholder.FindC ontrol("UserTex tBox1");
// Display the Text property.
Dyn_Lbl_msg01.T ext = submit_click_st r01 + '1' + submit_click_st r02 +
TempTextBox.Tex t;
}
/* -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- */
/* -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- */
}
/* - - - - - - - - - - - - - - - - - - - - - - */
/* END: protected class base_create_ctr l_pair */
/* - - - - - - - - - - - - - - - - - - - - - - */
/* /|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\ */
protected class ctrl_pair_creat ion_01 : base_create_ctr l_pair
{
private sys_obj_class lcl_sys_obj;
// constructor
public ctrl_pair_creat ion_01 (sys_obj_class sys_obj) : base (sys_obj)
{ lcl_sys_obj = sys_obj; }
/* . . . . . . . . . . . . . */
public void create_ctrl_pai r_01 ()
{ create_ctrl_pai r_0x
("UserTextBox1" , "DButton01" , "Submit 01");
button0x.Click += new EventHandler (Submit_Click);
if (!lcl_sys_obj.G et_this_page01. IsPostBack)
init_single_lin e_text_box (UserTextBox0x, 22);
}
/* . . . . . . . . . . . . . */
}
/* /|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\ */
/* /|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\_/|\ */
</script>
</head>
<body>
<form runat="server">
<h3> Control Init </h3>
Enter some text and click the Submit button. <br><br>
<asp:PlaceHolde r ID="Dyn_Control _Placeholder" runat="server"/>
<asp:Label ID="Message01" runat="server"/>
</form>
</body>
</html>
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THANKS!!!
- wASP
