Auto Format Phone Number in Jquery

Question

I have one textbox for phone number. My phone number should be XXX-XXX-XXX like this format.

I got the solution for XXX-XXX-XXX format, but i don\'t know how to modi

Answer 1

$('#ssn').keyup(function() {
        var val = this.value.replace(/\D/g, '');
        var newVal = '';
        for(i=0;i<2;i++){
         if (val.length > 3) {
          newVal += val.substr(0, 3) + '-';
          val = val.substr(3);
        }
        }
        newVal += val;
        this.value = newVal;
    });