asp.net building controls: dropdownlist - hooking into the onselectedindexchanged event renders onchange html attribute -- asp.net building controls

You're in the

asp.net building controls

group:

dropdownlist - hooking into the onselectedindexchanged event renders onchange html attribute

TS
7/27/2007 12:34:39 PM

asp.net building controls:

i have an inherited ddl and i have a property (OnChangeFunction) that when
set will add an onchange attribute to it which will call the JavaScript
method used in (OnChangeFunction). the problem is that it interacts with the
one created when assigning onselectedindexchanged to a server side event
handler; so what happens is two onchange html attributes are rendered.

i want to make it so my JS function call (specified in OnChangeFunction)
gets added as the first item in the onchange html attirbute when the
onselectedindexchanged is used, otherwise manually create the onchange
attribute.

what can i do?

thanks

RE: dropdownlist - hooking into the onselectedindexchanged event renders onchange html attribute

wawang NO[at]SPAM online.microsoft.com
7/30/2007 12:00:00 AM

Hi TS,

Without full code listing, I cannot reproduce the issue on my side clearly.
However, it's recommended to add your javascript or assign javascript
functions to the client-side events in OnPreRender:

public class Class1 : DropDownList
{

protected override void OnPreRender(EventArgs e)
{
Attributes.Add("onchange", "javascript:alert('changed!')");

base.OnPreRender(e);
}
}

Please post your code here if this doesn't help. Thanks.

Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

==================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.

Re: dropdownlist - hooking into the onselectedindexchanged event renders onchange html attribute

TS
7/30/2007 8:46:06 AM

that works, thanks

[quoted text, click to view]

Got something to say? Click here to post a reply to this thread.

Don't see what you're looking for? Try a search.

View other messages in the asp.net building controls group.

View Other Months
June 2003
July 2003
August 2003
September 2003
October 2003
November 2003
December 2003
January 2004
February 2004
March 2004
April 2004
May 2004
June 2004
July 2004
August 2004
September 2004
October 2004
November 2004
December 2004
January 2005
February 2005
March 2005
April 2005
May 2005
June 2005
July 2005
August 2005
September 2005
October 2005
November 2005
December 2005
January 2006
February 2006
March 2006
April 2006
May 2006
June 2006
July 2006
August 2006
September 2006
October 2006
November 2006
December 2006
January 2007
February 2007
March 2007
April 2007
May 2007
June 2007
July 2007
August 2007
September 2007
October 2007
November 2007
December 2007
January 2008
February 2008
March 2008
April 2008
May 2008
June 2008

home · blog · groups

Questions? Comments? Contact the dn