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Non-Jquery Form Validation

Hello there,

I've been working on my first real node project with express and it's been going really well thanks to the courses here at Treehouse.

Part of the project is a multi-step form with client-side validation. I've created these in the past successfully with the help of jquery but I decided early on in this project that I didn't want to rely on jquery. Unfortunately, most of the really good form validation plugins are written in jquery. Parsley and jquery validation plugin

Here is my working jquery code using jquery validation plugin:

$('#responsive-form .btn-next, .btn-banner').on('click', function() { 
        parent_fieldset = $(this).parents('fieldset');
        form = $("#responsive-form")
            errorClass: "has-error",
            validClass: "has-success",
            highlight: function( element, errorClass, validClass ) {
            unhighlight: function( element, errorClass, validClass ) {
            rules: {
                "currentZipCode": {
                    required: true, 
                    number: true, 
                    maxlength: 5, 
                    minlength: 5, 
                "property-state": {required: true},
                "firstName": {
                    required: true,
                    minlength: 2,
                    url: false,
                    number: false,
                "lastName": {
                    required: true,
                    minlength: 2,
                    url: false,
                    number: false,
                "eMail": {
                    required: true,
                    email: true,
                "phoneNumber": {
                    required: true
            messages: {
                "currentZipCode": "Please enter a valid zip code",
                "property-state": "Please select a state",
                "firstName": "Please enter your first name",
                "lastName": "Please enter your last name",
                "eMail": "Please enter a valid email address",
                "phoneNumber": "Please enter a valid phone number",
            tooltip_options: {
                "currentZipCode": {placement: 'bottom'},
                "property-state": {placement: 'bottom'},
                "firstName": {placement: 'bottom'},
                "lastName": {placement: 'bottom'},
                "eMail": {placement: 'bottom'},
                "phoneNumber": {placement: 'bottom'},
        if (form.valid() === true) {
            $(this).parents('fieldset').fadeOut(400, function() {

It confirms that the input on each "page" is valid before allowing the next button to be clicked.

On my new site, using vanilla javascript, I've got the next button working and it moves the form along to the next field group, however, I've been wildly unsuccessful finding a good way to validate each field within the field groups. Any suggestions or help would be GREATLY appreciated. Again, I'm trying to avoid using jquery if I can.

//Banner Form next button behavior
  for (i=0; i < nextButton.length; i++) {
    nextButton[i].addEventListener('click', function(){
      var form = document.getElementById('bannerForm')

      //if (valid){
        this.parentNode.style.display= "none";

1 Answer