Hello again to all of you geniuses,
I'm having a problem trying to load dynamic controls at the initialization phase.
I've read the docs, and I thought I had it figured out:
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<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>
.NET Framework Class Library
Control.Init Event [C#]
C#
public event EventHandler Init;
Event Data
The event handler receives an argument of type EventArgs.
Remarks
Server controls should perform any initialization steps that are required
to create and set up an instance. You cannot use view-state information
within this event; it is not populated yet. You should not access another
server control during this event, regardless of whether it is a child or
parent to this control. Other server controls are not certain to be created
and ready for access.
Example
[C#] The following example assigns a custom event handler, Control_Init,
to the Init event of a control, myControl, when the Page_Init method is
called on the page that contains the control.
[C#]
void Page_Init(objec t sender,EventArg s e)
{
// Add a event Handler for 'Init'.
myControl.Init += new System.EventHan dler(Control_In it);
}
void Control_Init(ob ject sender,EventArg s e)
{
Response.Write( "The ID of the object initially : " + myControl.ID);
// Change the ID property.
myControl.ID="T estControl";
Response.Write( "<br>The changed ID : " + myControl.ID);
}
© 2001-2002 Microsoft Corporation. All rights reserved.
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<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>
One thing I don't understand is: Where did "myControl" come from in the
given example?
In my own effort, I tried to attach a literal control to a placeholder:
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<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>
void Page_Init(objec t sender,EventArg s e)
{
// Add a event Handler for 'Init'.
// myControl.Init += new System.EventHan dler(Control_In it);
PlaceHolder plc_hldr = (PlaceHolder) FindControl ("Dyn_Control_P laceholder");
plc_hldr.Init += new System.EventHan dler (plc_hldr_Contr ol_Init);
}
/* ------------------------------------------------------------------ */
/* ------------------------------------------------------------------ */
void plc_hldr_Contro l_Init (object sender,EventArg s e)
{
Label lbl_msg01 = (Label) FindControl ("Message01" );
Dyn_Control_Pla ceholder.Contro ls.Add
( new LiteralControl( "<br>added 1 on init<br>") );
PlaceHolder plc_hldr = (PlaceHolder) FindControl ("Dyn_Control_P laceholder");
lbl_msg01.Text = "The ID of the object initially : " + plc_hldr.ID;
Response.Write( "The ID of the object initially : " + plc_hldr.ID);
plc_hldr.Contro ls.Add ( new LiteralControl( "<br>added 2 on init<br>") );
}
/* ------------------------------------------------------------------ */
/* ------------------------------------------------------------------ */
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<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>
... and nothing happened - the literal control was not there.
I'm hoping that someone smarter than me can clue me in on this
- I would be most grateful.
My complete code is as follows:
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<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>
<%@ Page Language="C#" AutoEventWireup ="True" %>
<html>
<head>
<script runat="server">
/* ------------------------------------------------------------------ */
/* ------------------------------------------------------------------ */
/* -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- */
public class sys_obj_class
{
private ControlCollecti on pram_ph01_ctrl;
public ControlCollecti on Get_pram_ph01_c trl
{ get { return pram_ph01_ctrl; } }
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)
{ pram_ph01_ctrl = Dyn_Ctrl_Placeh older.Controls;
this_page01 = Dyn_Ctrl_Placeh older.Page;
Obj_Dyn_Ctrl_Pl aceholder = Dyn_Ctrl_Placeh older;
Obj_Dyn_Label01 = Dyn_Label;
}
}
/* ------------------------------------------------------------------ */
/* ------------------------------------------------------------------ */
void Page_Init(objec t sender,EventArg s e)
{
// Add a event Handler for 'Init'.
// myControl.Init += new System.EventHan dler(Control_In it);
PlaceHolder plc_hldr = (PlaceHolder) FindControl ("Dyn_Control_P laceholder");
plc_hldr.Init += new System.EventHan dler(plc_hldr_C ontrol_Init);
}
/* ------------------------------------------------------------------ */
/* ------------------------------------------------------------------ */
void plc_hldr_Contro l_Init (object sender,EventArg s e)
{
Label lbl_msg01 = (Label) FindControl ("Message01" );
PlaceHolder plc_hldr = (PlaceHolder) FindControl ("Dyn_Control_P laceholder");
lbl_msg01.Text = "The ID of the object initially : " + plc_hldr.ID;
Response.Write( "The ID of the object initially : " + plc_hldr.ID);
plc_hldr.Contro ls.Add ( new LiteralControl( "<br>added on init<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 ControlCollecti on ph01_ctrl;
protected PlaceHolder base_Dyn_Ctrl_P laceholder;
protected Label Dyn_Lbl_msg01;
// constructor
protected base_create_ctr l_pair (sys_obj_class sys_obj)
{ ph01_ctrl = sys_obj.Get_pra m_ph01_ctrl;
base_Dyn_Ctrl_P laceholder = sys_obj.Get_Obj _Dyn_Ctrl_Place holder;
Dyn_Lbl_msg01 = sys_obj.Get_Obj _Dyn_Label01;
}
protected TextBox create_text_box _control (String text_box_id)
{ // Create UserTextBox TextBox control.
TextBox new_TextBox = new TextBox ();
// Configure the UserTextBox TextBox control.
new_TextBox.ID = text_box_id;
// Add UserTextBox TextBox control to the Controls collection
// of the Dyn_Control_Pla ceholder PlaceHolder control.
ph01_ctrl.Add (new_TextBox);
return new_TextBox;
}
/* --------------------------------------------------------- *
Example: The following example creates a Button,
sets its DialogResult property to DialogResult.OK ,
and adds it to a Form.
* --------------------------------------------------------- */
protected void InitializeMyBut ton (String Btn_ID, String Btn_text)
{ // Create and initialize a Button.
button0x = new Button();
button0x.ID = Btn_ID;
button0x.Text = Btn_text;
ph01_ctrl.Add ( new LiteralControl( "<br><br>") );
ph01_ctrl.Add (button0x);
}
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 TB_ID, String DB_ID, String DB_txt)
{ // Create UserTextBox TextBox control.
UserTextBox0x = create_text_box _control (TB_ID);
InitializeMyBut ton(DB_ID, DB_txt);
}
/* -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- */
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)
base_Dyn_Ctrl_P laceholder.Find Control("UserTe xtBox1");
// Display the Text property.
Dyn_Lbl_msg01.T ext = submit_click_st r01 + '1' + submit_click_st r02 +
TempTextBox.Tex t;
}
/* -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- */
}
/* - - - - - - - - - - - - - - - - - - - - - - */
/* - - - - - - - - - - - - - - - - - - - - - - */
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);
ph01_ctrl.Add ( new LiteralControl( "<br><br>") );
}
/* . . . . . . . . . . . . . */
}
/* - - - - - - - - - - - - - - - - - - - - - - */
/* - - - - - - - - - - - - - - - - - - - - - - */
/* - - - - - - - - - - - - - - - - - - - - - - */
</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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<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>-<[+]>
- wASP
