Reply to thread

Message

[QUOTE="Jonathan Wood, post: 3852471"]
I'm designing a control that will render some additional HTML content 
exactly once per page, regardless of the number of instances of the control 
on that page.

Thanks to Mr. Niver's suggestions, I got this working by calling 
Page.ClientScript.IsStartupScriptRegistered() from my control's Load event 
and writing that additional HTML content from the control only when 
IsStartupScriptRegistered() returns false.

This seemed to be working just fine from a Web User Control. But I'm now 
moving my control to a regular Web control. The first problem is that the 
Control has no Load event. One of my books shows a control initializing 
itself in the OnInit() override so I tried my code there:

protected override void OnInit(EventArgs e)
{
   // ...
   _createHiddenField = false;
   if (!Page.ClientScript.IsStartupScriptRegistered("OrderCartRequest"))
   {
      Page.ClientScript.RegisterStartupScript(this.GetType(), 
"OrderCartRequest", "function dummy() {}", true);
      _createHiddenField = true;
   }
   // ...
}

I placed five instances of this control on a page and set a breakpoint in 
the code above. I see that Page.ClientScript.IsStartupScriptRegistered() 
returns false when it is called each of the five times from each instance of 
my control. Obviously, I expect false to be returned only for the first 
instance of the control.

Can anyone see what I'm missing?

Thanks.

Jonathan
[/QUOTE]

Verification