Registering Javascript block in the codebehind: RegisterClientScriptBlock issue

Question

SCENARIO

The BasePage.cs implements System.Web.UI.Page. It is a superclass without aspx from where all actual pages are derived.

I am registering some javascript in the BasePage using RegisterClientScriptBlock:

public class BasePage : System.Web.UI.Page
{

  protected virtual void Page_Load(object sender, EventArgs e)
  {
    ClientScriptManager cs = Page.ClientScript;
    Type csType = this.GetType();
    cs.RegisterClientScriptBlock(csType, "handler", @"<script language='javascript' type='text/javascript'>alert('Something stupid!');</script>");
  }
}

I tested this snippet in a mock: it works right. Then I inserted the snippet in the BasePage.cs. In the index.aspx the script is not executed. Browser debugging shows that:

no script has been registered
no console error is displayed

In all other pages it works right.

QUESTION

Is there any specific issue related to the RegisterClientScriptBlock() method?

REMARK

I am sorry, but I am not allowed to post the whole index.aspx page code. But maybe if you have a clue then I can give you further details.

Where in BasePage is this code? Does the codebehind of index.aspx inherit BasePage or Page? Does the codebehind of index.aspx override the method which calls RegisterClientScriptBlock and not call the base version? — Rawling
– Rawling, Commented Sep 12, 2012 at 15:27
@ Rawling: as I said, all the pages inherit from BasePage. I added some context in the code snippet. The page_load method is overridden in the index.aspx page, but the base.Page_Load(sender, e) is executed first. — Alberto De Caro
– Alberto De Caro, Commented Sep 12, 2012 at 15:31
Try taking the virtual out of your Page_Load definition(s) - I think that might be your problem. — Rawling
– Rawling, Commented Sep 12, 2012 at 15:35
Does it behaving any differently if moved into the page_init method? — Andrew Walters
– Andrew Walters, Commented Sep 12, 2012 at 17:22

Alberto De Caro · Accepted Answer · 2012-11-14 10:15:55Z

1

Eventually a collegue of mine suggested to wrap the index.aspx markup with the form tag. That is enough and now everything is working fine.

answered Nov 14, 2012 at 10:15

Alberto De Caro

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Comments

PQubeTechnologies · Accepted Answer · 2012-09-12 15:42:42Z

0

did you check the option ViewSource in the browser. It will help you findout how the script is written as the final output.

answered Sep 12, 2012 at 15:42

PQubeTechnologies

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1 Comment

Alberto De Caro Over a year ago

some details added regarding client-side debugging.

Rawling · Accepted Answer · 2012-09-12 15:42:44Z

0

As I've commented: I believe marking your Page_Load as virtual may mean your descendant pages are somehow overriding it, then not calling the base (Base Page) version, causing the script not to be registered.

answered Sep 12, 2012 at 15:42

Rawling

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2 Comments

Alberto De Caro Over a year ago

I have removed the "virtual" modifier, but nothing changes in the index.aspx. Nice try.

Rawling Over a year ago

OK. It's very unusual to see virtual there so I thought this was worth a try :)

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