Form validation for zip code*, using jQuery.validator.js https://jqueryvalidation.org/ * US Postal Code, 5 or 9 digits

zipCodeValidation.js

$("form").validate({
	rules: {
		Zip: {zipCodeValidation: true} // hook in custom zip code validation
	}
});

$.validator.addMethod("zipCodeValidation", function() {
	var zipCode = $('input#zip').val();
	return (/(^\d{5}$)|(^\d{5}-\d{4}$)/).test(zipCode); // returns boolean
}, "Please enter a valid US zip code (use a hyphen if 9 digits).");

$("#submitButton").on("click", function(e) {
	e.preventDefault();
	var form = $("#myForm");
	form.validate(); // "validate" method is required for jquery.validate.js

	if (infoRequestForm.valid()) {
		// console.log("the form is valid.");

		// ------------------------------------------------------------
		// 
		// CODE TO SUBMIT FORM GOES HERE.
		// 
		// ------------------------------------------------------------

		$(".formContainer").hide();
		$(".thankYouMessage").show();
	}
});