Set max length in combo when edit mode

I will set combo in edit or read only mode.

When edit mode, it can provide user to type the option.

The above functions can do.

But I want to ask I can set the max length in combo type when edit mode ?

It is same as “input” type in a form that it can set to the field.

myForm.getCombo("cmb").DOMelem_input.maxLength  = 3;