click event not firing

[ryandale]

I'm having a problem dynamically loading controls. I have a page with a placeholder. There are 3 different controls ctl1, ctl2, ctl3 that I want to put in the placeholder (1 at a time, depending upon the value of a session variable called sessVar).

in ctl1 there is a submit button that when clicked it will change the value of sessVar. so i would like the corresponding control to load then.

here is the code to dynamically load the control:


switch (sessVar)
{
case 1:
PlaceHolder1.Controls.Add(LoadControl("Controls/PropertySearch/ctlFilters.ascx"));
break;
case 2:
PlaceHolder1.Controls.Add(LoadControl("Controls/PropertySearch/ctlResults.ascx"));
break;
case 3:
PlaceHolder1.Controls.Add(LoadControl("Controls/PropertySearch/ctlPropDetails.ascx"));
break;
default:
sm.sSearchStage = 1;
PlaceHolder1.Controls.Add(LoadControl("Controls/PropertySearch/ctlFilters.ascx"));
break;
}



the problem is that i cant figure out where to put the above code. if i put it in Page_Load() then the control is loaded before the click event in ctl1, so i have to refresh or click the button twice for ctl2 to load. if i put the above code in PreRender() then the button event does not even fire (which i don't understand).


i'm having the same problem as being mentioned here:

http://www.thescripts.com/forum/thread287341.html

Thanks all,
Ryan

 

[BoulderBum]

It's best to dynamically load controls on Init if possible.

How about this:

//On_Init
if( !Page.IsPostBack )
{
    LoadControl( (string)Session["Key"] );
}

//on button click
string controlName = "fill in";

Session["Key"] = controlName;
LoadControl( controlName );

//have a function
private void LoadControl( string controlName )
{
    PlaceHolder1.Controls.Clear();

    switch (controlName)
            {
                case "Filters":
                    PlaceHolder1.Controls.Add(LoadControl("Controls/PropertySearch/ctlFilters.ascx"));
                    break;
                case "Results":
                    PlaceHolder1.Controls.Add(LoadControl("Controls/PropertySearch/ctlResults.ascx"));
                    break;
                case "PropDetails":
                    PlaceHolder1.Controls.Add(LoadControl("Controls/PropertySearch/ctlPropDetails.ascx"));
                    break;
                default:
                    sm.sSearchStage = 1;
                    PlaceHolder1.Controls.Add(LoadControl("Controls/PropertySearch/ctlFilters.ascx"));
                    break;
            }
}

 

[ryandale]

well that is essentially the same thing. the page_init executes before my button_click event. and my button_click event is what modifies the variable i need to read in to decide which control to be displayed.....

do you need me to post all my code?

 

[BoulderBum]

No.

To refactor, however, you probably want to have Init always add the control, and it may be better to set the Session variable in LoadControl().

i.e.

//in init
LoadControl( Session["Key"] as string );

//in button click
LoadControl( "derived name" );

//function
private void LoadControl( string controlName )
{
    if( controlName == null )
       return;

    Placeholder1.Controls.Clear();

    Session["Key"] = controlName;
 
    //load control
}

That simple arrangement should suit your situation, but if it doesn't for some reason, please drop a note.