Custom Form Validation Using ZeroBounce

[Ben_Bordofsky]

Hello!

I'm working on integrating ZeroBounce with our Marketo forms for custom validation, but I'm running into a bit of trouble getting the form.submittable value to be set. I've included my code below. 

I believe that the issue is happening because I'm trying to set the form.submittable within the callback (done) function. Right now, because I set form.submittable as false outside of the AJAX call it is always false. If I try to change form.submittable to true within the AJAX call then nothing gets updated. 

Any ideas or suggestions on what I'm doing wrong? I'm also open to alternate approaches entirely. I was thinking about trying to trigger my validation on a different event so that I can leave the onValidate alone. 

<script src="mysite.com/forms2.min.js"></script> <form id="mktoForm_1234" class="mktoForm"></form>
			<script>
				
				MktoForms2.setOptions({ formXDPath : 'myxframepath' });
				MktoForms2.loadForm("//mysite.com", "123-abc-456", 1234);
				
				MktoForms2.whenReady(function(form) {

				  form.onValidate(function(nativeValid) {

					if (!nativeValid) return;

					/*Create variable for email address user input*/
					 var emailObject = form.getValues();
					 var emailToTest = Object.values(emailObject)[2];
					 var emailToTestResponseStatus="placeholder";
					 
					 form.submittable(false);
					 
						var jqXHR=jQuery.get(ajaxurl,{
      						dataType: 'json',
						    action:'myAction',
						    email:emailToTest,
      						async: false
    					}).done(function() {
							emailToTestResponseStatus=jqXHR.responseText;
					 		var emailObjForErrors = form.getFormElem().find("#Email");
					 		
							if (emailToTestResponseStatus == "invalid"||emailToTestResponseStatus == "unknown"||emailToTestResponseStatus == "spamtrap"||emailToTestResponseStatus == "abuse"||emailToTestResponseStatus == "do_not_mail") {
					   			form.showErrorMessage("The email you've entered is invalid. Please try again.", emailObjForErrors);
								
					   			form.submittable(false);					   
					 		} 
					 		else {
					   			//form.showErrorMessage("The email you've entered is valid. But did not submit...", emailObjForErrors);
				   			    
								<!--ISSUE HERE-->form.submittable(true);
								
								
					 		}
						});//end Done function	
						
					  	
				  	});/*onValidate ends here*/
				});

				</script>