codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Untitled Document</title>
<script type="text/javascript">
function Format(input){
var valori = input.value
var gg, mm, aaaa, forma
if(valori.length < 6){
alert('inserire minimo 6 caratteri numerici')
setTimeout('input.focus();',100)
return false;
}else if(valori.length > 8){
alert('inserire massimo 8 caratteri numerici')
setTimeout('input.focus();',100)
return false;
}else if(valori.length == 6){
gg = '0'+valori.substr(0,1);
mm = '0'+valori.substr(1,1);
aaaa = valori.substr(2,6);
forma = gg+'/'+mm+'/'+aaaa;
}else if(valori.length == 8){
gg = valori.substr(0,2);
mm = valori.substr(2,2);
aaaa = valori.substr(4,8);
forma = gg+'/'+mm+'/'+aaaa;
}else{
alert('La data deve essere nel formato 6 0 8')
setTimeout('input.focus();',100)
return false;
}
document.getElementById(input.id).value=forma;
}
</script>
</head>
<body>
<input name="data" type="text" id="data" onblur="Format(this)" />
</body>
</html>
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