Question : How do I prevent a Submit if input validation fails?

If I'm doing input validation behind a HTML submit button, and the validation fails, how do I prevent the "submit"?  Doing my input validation in the click of the submit button, is this the "correct" way to do it?

Thanks.

Answer : How do I prevent a Submit if input validation fails?

suppose validatePage() is your javascript function and it should return true or false.

then in your button onclick event you have to put onclick="return validatePage();"

then if the function returns false then your submit never hits.