javascript button click and asp.net button click

Question

I want to click a button (ASP.net) - which needs to run a JS method and if its true, then it has to call the ASP.Net - ie., i hv a form, and if its validated(JS returning true) in the client side - then only my asp.net button -click event must fire.

How to do this?

Chandu · Accepted Answer · 2011-01-26 19:51:11Z

3

Try OnClientClick attribute of asp:Button i.e.

<asp:Button ...  OnClientClick="return yourValidationMethod()" />

Make sure that your validation method returns true or false based on the validation.

answered Jan 26, 2011 at 19:51

Chandu

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Brian Mains · Accepted Answer · 2011-01-26 19:56:38Z

1

If you want to run something only on one response, use @Cybernate's example but modified:

<asp:Button ...  OnClientClick="if (yourValidationMethod() == false) return false;" />

If invalid, the return false would block the postback, otherwise normal postback happens.

answered Jan 26, 2011 at 19:56

Brian Mains

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2 Comments

WSS K Over a year ago

in what way it is different from the <asp:Button ... OnClientClick="return yourValidationMethod()" /> ?? Just curious to know as im new to JS !

Brian Mains Over a year ago

OK, after the client click code, there is either a __doPostBack or WebForm_DoPostBackWithOptions call that actually triggers the postback to the server. Just doing return yourValidationmethod(); will never allow the postback when the validation succeeds. Exiting the routine only when false, as I have, will only block the postback when invalid.

Ilya Volodin · Accepted Answer · 2011-01-26 19:50:46Z

1

Use OnClientClick property for ASP.NET button. Return false if validation failed, return true if it succeeded.

answered Jan 26, 2011 at 19:50

Ilya Volodin

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1 Comment

WSS K Over a year ago

Thanks Pal. I know OnClientClick - but didnt know these days this has a nice effect !! what a lame guy im !!

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