English Only Check

This site is best viewed in a modern browser with JavaScript enabled.

weee

Hi There.

How can I make a check that will check for English letter only and also make sure that there's minimum of 4 letters and maximum of 8?

Thanks a lot

AdamGundry

By "English letter only" I presume you mean A-Z or a-z, in which case you can use a regular expression like this:

var mystr = 'word';

if (mystr.search(/^[A-Za-z]{4,8}$/) > -1){
  alert('Ok');
} else {
  alert('No, sorry.');
}

Adam

weee

Here it is:

Why's that?

AdamGundry

Try document.dd.username.value.search

Adam

weee

now I'm trying to do this:

But I can't get it work. it keeps giving me alert even if I'm doing the right thing.

Thanks a lot man

AdamGundry

The not operator (!) has a higher precedence than the greater than operator (>) so it is evaluated first. You need to do this:

if (!(document.dd.username.value.search (/^{[A-Za-z]{4,8}$/)} > -1))

Adam

weee

ask you how can I add to the check that the user can also add the character "_"?

Thanks a lot man!

AdamGundry

You can change [A-Za-z] into [A-Za-z_].

No problem.

Adam

weee

possible to ask you one more thing that don't relate to that thread but it's still in JavaScript (it's supposed to be simple)?

AdamGundry

I guess so.

Adam

weee

and I want it to validate that the phone number is that way:
bb-ccc-cccc

This is what I got so far and I can't get it done:

function checkPhoneNumber()
{
var f = document.forms[0];
alert('Valid phone number: ' + f.elements[0].value.isPhoneNumber());
return false;
}
</script>

Thanks

AdamGundry

Try this:

String.prototype.isPhoneNumber = function()
{
return /^{\d{2}-\d{3}-\d{4}$/.test(this);}
}

Adam

weee

By reading all of you posts I learned the a lot. it's working fine like that:

function check()
{
if (!(/^{\d{2}-\d{3}-\d{4}$/.test(document.dd.PhoneNumber.value)))}
{
window.alert('PhoneNumber');
document.dd.PhoneNumber.focus();
return false;
}
}

weee

that the first number can be 2 OR 3 numbers?