Very Strange Problem! (Derived Controls) - Help!

[Sosh]

Hi,

I'm pulling my hair out trying to work this out. Pehaps I am
missunderstanding something - hopefully someone can shed some light on this:

1) I have a class library that contains a bunch of custom web controls. Two
of these controls are derived from the TextBox control, and overide the
onLoad method in order to add some client side attributes, eg:

namespace SomeControls{

public class Control1 : System.Web.UI.WebControls.TextBox

{
public Control1 ()
{
}

protected override void OnLoad(EventArgs e)
{
this.Attributes["onblur"] = "some javascript";
base.OnLoad(e);
}
}

}

AND.........

namespace SomeControls{

public class Control2 : System.Web.UI.WebControls.TextBox

{
public Control2 ()
{
}

protected override void OnLoad(EventArgs e)
{
this.Attributes["onfocus"] = "some other javascript";
base.OnLoad(e);
}
}

}

2) I have a some user controls, that contain the custom controls, which are
added Declaratively

3) I Dynamically load one of the user controls into my page depending on
certain factors.



My problem is this: When the page is rendered, some of the custom controls
are rendered incorrectly - they seem to be taking elements from each of the
controls that derive from the TextBox control. For instance, a control that
was declared as SomeControls:Control1 will be rendered with the attributes
from BOTH SomeControls:Control1 and SomeControls:Control2. (eg both the
onBlur and onFocus attributes) !!? To add to the strangeness, sometimes
this happens, and sometimes this does not - If there are 10 instances of
SomeControls:Control1 on the page, sometimes the top who will contain the
elements from SomeControls:Control1 and SomeControls:Control2, while the
rest will render correctly with just the SomeControls:Control1 code.

Its like the two classes SomeControls:Control1 and SomeControls:Control2 are
interfereing with each other somehow.

I hope this makes some sense - it's pretty hard to explain, and personally I
am loosing faith that I can figure out what is going on here. Can someone
exlplain? Please!

Thanks V much

S

 

[Karl Seguin [MVP]]

I understand what you are explaining, but i've never seen this behavior, and
I'm not sure what could possibly be the cause. Any chance of zipping up a
simplified example and sending it to my email (it's somewhat obfuscated, but
you can figure it out .

Karl