Alphabet Check Javascript Problem

cupofjava

07-12-2005, 01:21 PM

Thanks very much for your help its working now :)

glenngv

07-12-2005, 01:35 PM

Conditional operator is == and not =.

glenngv

07-12-2005, 02:10 PM

You're welcome. :)
But why did you overwrite your original post? Others who might have similar problem can use it as a reference.

cupofjava

07-12-2005, 06:23 PM

Sorry for that, it was a mistake.

I am going to post it again now. Problem I am having at the moment is that no matter whatever I enter it gives out same "false" answer :( any ideas??

<html>
<head>
<title> question </title>

<script
language="JavaScript"
type="text/javascript">

var someInput;
someInput = window.prompt('Please enter a single character ','');

var theAnswer;

function isInAlphabet (someInput) {

if ((someInput == 'A') || (someInput == 'z'))

theAnswer = true;

} else {

theAnswer = false;
}

return theAnswer;
}

var aResult;

aResult = isInAlphabet();
{

document.open();
document.write('The answer to whether ' + someInput + ' is in the alphabet is ' + theAnswer);
document.close();
}

</script>
</head>

<body>

</body>
</html>

nikkiH

07-12-2005, 06:41 PM

No, you've got that all wrong. You're only checking for capital A and lower-case z.
Try my isAlpha function, modified to accept only one letter.
http://www.ipwebdesign.net/kaelisSpace/useful_jsValidation.html

function isAlpha(val)
{
// True if val is a single alphabetic character.
var re = /^([a-zA-Z])$/;
return (re.test(val));
}

cupofjava

07-12-2005, 06:53 PM

Hi thanks for your reply...

I'm afraid that's a little bit beyond my talents at the moment!! I understand what the function is trying to do, in that it would only allow alpha characters but beyond that it means nothing to me and I can't get it to work..

Anything a bit simpler?

Willy Duitt

07-12-2005, 08:59 PM

http://www.webdeveloper.com/forum/showthread.php?t=72612

cupofjava

07-12-2005, 09:04 PM

Both of those posts were mine...I'm still looking for help! Thanks to all those who have replied i'm still working on it

Willy Duitt

07-12-2005, 09:11 PM

Unfortunetly you removed your first post that showed what your original question was... However, a look at the question on the other thread I linked too, shows that all you need is isNaN...

Hello

I am trying to complete the following code so that whenever I input character it can tell me whether or not it is a letter of the alphabet.

However every time I input anything it comes up as false and I was told this might be because of my if statement as it seems to only be searching for the specific letters I have entered in the statement. I am a real beginner so any advice you can offer would have to be pretty clear and simple to be of use.

I would be really grateful for any replies and thank you in advance:

<html>
<head>
<title>question</title>

<script
language="JavaScript"
type="text/javascript">

var someInput; // declared variable
someInput = window.prompt('Please enter a single character ',''); // window prompt

var theAnswer;

function isInAlphabet (someInput) {

if ((someInput == 'A') || (someInput == 'z')) {

theAnswer = true;

} else {

theAnswer = false;
}

return theAnswer;
}

var aResult;

aResult = isInAlphabet();
{

document.open();
document.write('The answer to whether ' + someInput + ' is in the alphabet is ' + theAnswer);
document.close();
}

</script>
</head>

<body>

</body>
</html>

Although, nikkiH's solution would work as well...

.....Willy

cupofjava

07-12-2005, 09:13 PM

Oh right of course I did DUH!

Sorry bout that...

Willy Duitt

07-12-2005, 09:17 PM

Oh right of course I did DUH!

Sorry bout that...

Please update any other threads you may have started to indicate that a solution has been found - and what it was - or a link back here...

Thank You;
.....Willy

nikkiH

07-13-2005, 01:15 AM

A full solution:

<HTML>
<HEAD>
<TITLE> New Document </TITLE>
</HEAD>

<BODY>
<script type="text/javascript">
function isAlpha(val)
{
// True if val is a single alphabetic character.
var re = /^([a-zA-Z])$/;
return (re.test(val));
}
var someInput;
someInput = window.prompt('Please enter a single character ','');

document.write('The answer to whether ' + someInput + ' is in the alphabet is ' + isAlpha(someInput));
</script>

</BODY>
</HTML>