JS for formatting and masking not working

Hello!

I have a form that requires authentication via a user ID. This ID is the same format as an SSN: XXX-XX-XXXX.

I don’t know JS, but was able to cobble together some code that I thought was validating for numbers only, entering 9 of them, and masking to keep the dashes in the format.

I was wrong and somehow, 0.8% of respondents have been able to skirt the requirements and mask.

I have been able to identify two issues - though I do not know how to fix them.

1. The user is able to enter spaces.
2. The user does not have to enter 9 digits. 

There are other entries that I can’t figure out how the entries occurred and cannot duplicate.

1. One user entered a name.
2. One user entered an email address.
3. Once, the dashes were replaced with slashes.
4. A few times, the dashes were replaced with zeroes.
5. A few times, the dashes were replaced with spaces.

This is a test survey with just the ID question + JS for test.

Here is the JS:

Qualtrics.SurveyEngine.addOnReady(function()
{
    jQuery(".InputText").on("cut copy paste",function(e) {
e.preventDefault();
});
jQuery(".InputText").on('keypress',function(){
if(event.which != 8 && isNaN(String.fromCharCode(event.which))){
event.preventDefault(); //stop character from entering input
}
var s = this.value.replace(/-/g,'');
if(s.length==9){
event.preventDefault();
}
if(s.length!=0){
if(s.length>=3 && s.length<=4){
var s1 = s.slice(0,3);
var s2 =s.slice(3,s.length);
this.value=s1+"-"+s2;
}
if(s.length>=5){
var s1 = s.slice(0,3);
var s2 =s.slice(3,5);
var s3=s.slice(5,s.length);
this.value=s1+"-"+s2+"-"+s3;
}
}

});
});

If anyone can help me adjust this code, or even explain the results that I can’t duplicate, I would be eternally grateful.

Please let me know if additional information is needed.

Thank you so much,

erin