Checking input before sending request

Hello JSP-fellows,
I have an jsp-page with a number of input fields which I would like verify before I send the request.
Is there any possibility that after pressing the submit button I go to
a java script input check and if the check is not OK I do not send the request to the server?
My submit button tag looks like this (the ordinare way):
<td ><input type="submit" value="Submit" name="submitButton"></td>
Can I, in some way, embed an onClick() script in the tag above and not execute the submition in case any input field is wrong?
Perhaps there are some other better ways to do an input check in an jsp page before sending request?
Thanks in advance for you help,
Best regards
Danny

Not really a JSP issue, more general HTML.
But, yes you can. You can, like you already wrote, embed an onclick in a submit button. A better approach, in my opinion, is to use the onsubmit function of the FORM tag:
<FORM action="..." onsubmit="return validate();" >
Let the validate function return false if the validation wasn't successfull, then the form will not be posted.

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