Question

Hei

Have anyone idea of input mask in jquery For example a field must have three letters followed by 4 numbers. cda1234. If one writes something in the field that does not fit with this must be removed continuously.

Answer 1

Cooked an fast example up, see: http://jsfiddle.net/g8KSg/2/

Checks for non integers for the first 3 characters, and then only accept integers.

Could proberbly be made wiser with regex, but this should give a starting point 🙂

$('input').keyup(function(e){
    var value = $(this).val();
    if(value.length <= 3) {
       char = value.substring(value.length - 1);
        if(!(isNaN(char))) {
            var newval = value.substring(0, value.length - 1);
            $(this).val(newval);
        }
    }
    if(value.length > 3) {
       char = value.substring(value.length - 1);
        if(isNaN(char)) {
            var newval = value.substring(0, value.length - 1);
            $(this).val(newval);
        }
    }
});