Username Validation

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Javascript

Hi

I want a Javascript validation to force the user to start the username with a character .

Thanks in advance

Posted 23-Jan-11 19:52pm

Vinodh.B

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Igor Kushnarev 24-Jan-11 2:04am

Did you try regexp?

shakil0304003 24-Jan-11 5:31am

what you tried?

Vinodh.B 24-Jan-11 5:36am

this is wat i tried .

<script type="text/javascript">
function FirstLetterCharacter(val) {
if (val.value.length > 0) {
var firstLetter = val.value.substring(0, 1);
var remainingLetters = val.value.substring(1);
firstLetter = firstLetter.replace(/[^a-zA-Z]/, '');
if (firstLetter == '')
message.style.display = "block";
else
message.style.display = "none";
val.value = firstLetter + remainingLetters;
}
}
</script>

shakil0304003 24-Jan-11 5:40am

You have to call the function in 'onKeyUp' event of textbox.

Vinodh.B 24-Jan-11 5:41am

Yes . Am testing this script.

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Sandeep Mewara · Answer 1 · 2011-01-23T20:57:00

Steps:
1. Have a 'onKeyUp' event defined for the username textbox
2. In JS, based on the method defined for onKeyUp, check the letter pressed.
3. If the letter is not an alphabet then throw an error - show alert/message/text anything as desired.

OR

Above method was to throw an error on the fly. You can also do the validation at the time of create button click. At the button click, see if the username start from alphabet or not and act accordingly.

Try!

Vinodh.B · Answer 2 · 2011-01-24T00:22:00

XML

<script type="text/javascript">
        function FirstLetterCharacter(val) {
            if (val.value.length > 0) {
                var firstLetter = val.value.substring(0, 1);
                var remainingLetters = val.value.substring(1);
                firstLetter = firstLetter.replace(/[^a-zA-Z]/, '');
                if (firstLetter == '')
                    message.style.display = "block";
                else
                    message.style.display = "none";
                val.value = firstLetter + remainingLetters;
            }
        }
    </script>

Username Validation

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