There is no alert when submitting a form using ajaxForm plugin

There is no alert when submitting a form using ajaxForm plugin

How can I have an alert that the form has been submitted successfully? I
have already tried to look at the page of the plugin still come up empty
handed.
This is the code I have tried so far maybe there is something wrong with
my syntax:
<script type="text/javascript">
$(document).ready(function(){
$('#f1').ajaxForm({
success: function(){
alert("Form successfully submitted");
}
});
});
</script>
The code above works and successfully inserted all the data in the forms
but the alert that suppose to appear after successfully submitted the form
is missing for some reason.