Validasi Input Dengan JavaScript

Validasi Input Degnan Javascript :


Penulisan JavaScript :

<script type="text/javascript" language="javascript">
function cekform(form){
if(form.username.value==""){
alert ("Kolom ini wajib di isi");
form.username.focus();
return (false);
}
return (true);
}
</script>

Penulisan form input

<input type="text" name="username" />

Penulisan form

<form action="input.php" method="post" onsubmit="return cekform(this)">