How to add javascript to form field questions?

I need to edit a specific form field question asking for DOB to auto-populate the " - " between the MM-DD-YYYY when users type. I added a JavaScript code to that question, but instead of applying the MM-DD-YYYY to just the specific form question, it applies to every question in the block (i.e., form fields that ask for the user's name only allow ##-##-#### responses). I think I'm missing some code to apply it specifically to the form field I want (which is Q73, form field 1). Can you help me figure out what I'm missing? I would appreciate it!
I added this JavaScript to the question with the form field:
Qualtrics.SurveyEngine.addOnload(function()
{
/*Place your JavaScript here to run when the page loads*/
var that=this.questionId;

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==8){
     event.preventDefault(); 
    }
    if(s.length!=0){
      if(s.length>=3 && s.length<=5){
       var s1 = s.slice(0,2);
        var s2 =s.slice(2,s.length);
        this.value=s1+"-"+s2;
      }
      if(s.length>=6){
       var s1 = s.slice(0,2);
      var s2 =s.slice(2,4);
       var s3=s.slice(4,s.length);
       this.value=s1+"-"+s2+"-"+s3;
}  
     
}
});

});

Qualtrics.SurveyEngine.addOnReady(function()
{
/*Place your JavaScript here to run when the page is fully displayed*/

});

Qualtrics.SurveyEngine.addOnUnload(function()
{
/*Place your JavaScript here to run when the page is unloaded*/

});

How can I update this JavaScript to apply to one specific form field?