In the old designer you could use JS to limit the number of characters in the Other option for radio and checkboxes. Does/Will 11 have this option since JS is limited?
I know it's not ideal for every situation - but I usually end up using a separate field for Other, and using Field Rules to show/hide it. It just gives more control over appearance and functionality than the built-in other field on the checkboxes.
A potential solution would be using built in onFieldChange and getFieldValue functions to limit the value like this:
function limitOtherChoice(fieldId, limit) {
let fieldValue = LFForm.getFieldValues({fieldId: fieldId});
if (fieldValue.otherChoiceValue && fieldValue.otherChoiceValue.length > limit) {
fieldValue.otherChoiceValue = fieldValue.otherChoiceValue.substring(0, limit);
LFForm.setFieldValues({fieldId: fieldId}, fieldValue);
}
}
LFForm.onFieldChange(function(){
limitOtherChoice(1, 10);
}, {fieldId: 1});
But it would still allow user to type more than limit and then remove the extra chars after change is triggered.