Reject special characters from user input

Albuckj2 · Apr 10, 2003

When users input something into a prompt box, how can I stop users entering special characters?
i.e. - I only want to allow characters and numbers

Thanks,
Alex.

EdwardMartinIII · Apr 10, 2003

add an onkeyup action to the control. If the last character is not [a..z,A..Z,0..9] then content = content.substring(0,length-1).

This is shorty pseudocode, in case it wasn't obvious. [smile]

Cheers,

Edward

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4345487 · Apr 10, 2003

Here is a sample.

<Html>
<head><title></title>
</head>
<BODY>

<center>
<form>
This field will not accept special characters: (like !@#$%^&* etc)<br>
<textarea rows=2 cols=20 name=comments onKeypress="if ((event.keyCode > 32 && event.keyCode < 48) || (event.keyCode > 57 && event.keyCode < 65) || (event.keyCode > 90 && event.keyCode < 97)) event.returnValue = false;"></textarea>
<br>
</form>
</center>
</Body>
</Html>

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Reject special characters from user input

Albuckj2

Programmer

EdwardMartinIII

Technical User

4345487

Programmer

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