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All Scripts JavaScripts ASP Scripts Other Scripts
 Form
Validation. 
Many Web Sites show how to validate
forms. All of them have some small peaces of information.
Usefull information but it is not completed. I will try to
show as much as possible about form validation. Try this:
In order to validate form you
have to call function that I called formVal():
<form method="POST" action="default.asp" name="form1" onSubmit="return
formCheck()">
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Into the HEAD section:
<script language="JavaScript"> function
formCheck()
{
.....Validation rules here........
.........
........
}
</script>
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Now what kind of validation rules
we might use:
1. Email Validation:
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if (document.form1.email.value.indexOf("@")
== -1 ||
document.form1.email.value == "")
{
alert("Please enter email address.");
document.form1.email.focus();
return false;
}
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2. Number Validation:
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if( isNaN(document.form1.number.value)
)
{
alert('Not a number!');
document.form1.number.focus();
return false;
}
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3. Date Validation:
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var checkdt=new Date(Date.parse(document.form1.date.value
) );
if( !checkdt.getYear() )
{
alert('Not a date!');
document.form1.date.focus();
return false;
}
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4. Lenght Validation:
No longer then:
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if (document.form1.field1.value.length>3)
{
alert("Do not insert more then 3 characters");
document.form1.field1.focus();
return false;
}
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Longer then:
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if (document.form1.field2.value.length<3)
{
alert("Do not insert less then 3 characters");
document.form1.field2.focus();
return false;
}
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5. Not Empty field Validation:
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if (document.form1.anything.value
== "")
{
alert("Sorry but field Anything cannot be empty.");
document.form1.anything.focus();
return false;
}
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