How do I limit the amount of characters in a text field in the RTC??

This will help you to limit the characters in text field

<script language="javascript" type="text/javascript">
function limitText(limitField, limitNum) {
    if (limitField.value.length > limitNum) {
        limitField.value = limitField.value.substring(0, limitNum);
    }
}
</script>

    <input type="text" id="sessionNo" name="sessionNum" onKeyDown="limitText(this,5);" 
onKeyUp="limitText(this,5);"" />


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1. All the Text and HTML attributes have limitations in their sizes anyway.
   
2. It would be possible to create an attribute customization based validator ( https://jazz.net/wiki/bin/view/Main/AttributeCustomization ) it would have to get the text value and check its length.