HTML and CSS Reference
In-Depth Information
EXAMPLE
17.47 (
CONTINUED
)
else if( myForm.select1.selectedIndex==2){
cc_type="Discover";
}
else {
alert("You didn't select a card type.");
}
3
cc_length=myForm.text.value.length;
4
switch(cc_type){
5
case "Visa" :
6
if ( cc_length == 13 || cc_length == 16){
return true;
}
else{
alert("Invalid length");
return false;
}
break;
7
case "MasterCard":
if ( cc_length == 16){
return true;
}
else{
alert("Invalid length");
return false;
}
break;
8
case "Discover":
if ( cc_length == 16){
return true;
}
else{
alert("Invalid length");
return false;
}
break;
default:
alert("Invalid type");
return false;
break;
}
}
</script>
</head>
<body bgcolor="lightblue">
<big>
Continues
