How to call javascript function & action method on clicking jsf button?

I have one jsf custom button. I am checking client side validations in mail by calling javascript function & also sending mail by calling action method of a bean which will execute at server side for onclick event of that button. Because of this when I click on that button its calling both javascript function and action method. So even though validations failed its sending mail. How can I overcome this problem?? Please help me....

I am asking regarding commanLinks in jsf. I have the following code block in jsf. Even though mailSentMessage('true'); returns false, its calling action="#{emailObjectAction.sendEmail}" method. thats why I got that doubt. try the following code.
<h:commandLink id="mailBtn123Send" onclick="return mailSentMessage('true');" value="send mail" action="#{emailObjectAction.sendEmail}">
</h:commandLink>

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I have a requirement to call Javascript function inside a After Submit Process.
clear requirement below:
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How to call javascript function for SAP button
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Thanks in advance.

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Please help...
I have a site that run multiple of domain for example
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Domain (B): raymond.ca
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http://livedocs.adobe.com/flash/mx2004/main_7_2/wwhelp/wwhimpl/common/html/wwhelp.htm?cont ext=Flash_MX_2004&file=00001750.html

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I will explain my scenario correctly
Let us take two pages
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2. Child page (B)
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regards
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Since your business method is called after the form is submitted, and your code is running on the server, probably the only thing you can do is this:
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Hi,
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Regards,
Deepak

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Hello Everyone,
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VIDs

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Hi Carl,
You say that I must have an Item or region that contains my js with conditionnal display. With this method I can execute my js with specific request value.
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Homepage : http://www.insum.ca
InSum Solutions' blog : http://insum-apex.blogspot.com

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How to call javascript function & action method on clicking jsf button?

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