html-php form submission after validation through JavaScript [closed]

javascript php forms dom-events

PHP Snippet 1:

<form id="myform" action="process.php" method="post" onsubmit="return validate();">
//some form elements here
<input type="submit" value="Submit this form" />
</form>

<script type="text/javascript">
function validate(){
    ...
    if(!valid)
        alert('Error');
    return valid;
}
</script>