English Only Check

[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:

<script type="text/javascript">
function ccc()
{
if (document.dd.username.search(/^[A-Za-z]{4,8}$/) > -1)
{
alert('Ok');
}
else
{
alert('No, sorry.');
}
}
</script>

<form name="dd" action="#" onSubmit="return ccc();">
<input type name="username">
<input type="submit" value="Submit">
</form>

Why's that?

[AdamGundry]

Try document.dd.username.value.search

Adam

[weee]

now I'm trying to do this:

<script type="text/javascript">
function ccc()
{
if (!document.dd.username.value.search (/^[A-Za-z]{4,8}$/) > -1)
{
alert('No, sorry.');
document.dd.username.focus()
return false;
}
}
</script>

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:

<script type="text/javascript">
String.prototype.isPhoneNumber = function()
{
return /^\([1-9]\d{2}\)\s?\d{3}\-\d{4}$/.test(this);
}

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

<form action="#" onSubmit="return checkPhoneNumber();">
<input type="text" id="number">
<input type="submit" value="Submit">

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?

[weee]

!