Make DropDownList fire a clientside Javascript function?

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John Kotuby - 12 Dec 2007 22:38 GMT

Hi all,

In ASP.NET 2.0 and VB.NET, I am trying to get the OnSelectedIndexChanged
event to fire a Javascript function. There is no OnClientClick event for
that control.

When I try something like:
OnSelectedIndexChanged="javascript:SetOwner('<%= lstOwner.ClientID %>');" I
get an error.

Whereas for a simple HTML anchor I can do:
<a href="javascript:show_calendar('aspnetForm.txtUpdate');"
without a problem.

Any ideas?

TIA

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Scott Roberts - 12 Dec 2007 22:54 GMT

John,

I think you're looking for the javascript "onchange" event (which runs in
the browser) not the OnSelectedIndexChanged event (which runs on the
server). Also, don't be afraid to post a little more code! ;)

Scott

> Hi all,
>
[quoted text clipped - 13 lines]
>
> TIA

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John Kotuby - 13 Dec 2007 01:24 GMT

Thanks again Scott,

Sometimes I lose sight of the fact that ASP.NET is simply generating HTML
and I should break out the HTML books to look for the correct clientside
event for the corresponding HTML tags that are rendered and to append the
event to a server control that does not natively support that event. I am
beginning to see the value of custom Server controls that inherit from the
base controls and have developer-added functionality.

Of course, some of the clientside Javascript that ASP.NET generates is
highly inscrutable.

> John,
>
[quoted text clipped - 21 lines]
>>
>> TIA

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Peter Bromberg [C# MVP] - 13 Dec 2007 02:04 GMT

you can always add client-script event handlers to ASP.NET controls via
attributes, and they will get rendered into the browser as Javascript
--there is rarely a need to author custom controls in order to do this.
-- Peter
Site: http://www.eggheadcafe.com
UnBlog: http://petesbloggerama.blogspot.com
MetaFinder: http://www.blogmetafinder.com

> Thanks again Scott,
>
[quoted text clipped - 33 lines]
> >>
> >> TIA

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Make DropDownList fire a clientside Javascript function?

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