Disable “Add to Cart”?

Inorder to achieve your requirement, please add the below code in your child theme’s functions.php file.

function disable_add_to_cart_till_required_fields_filled(){
    ?>
    <script type="text/javascript">
        (function($, window, document) {
            function may_disable_add_to_cart_button(){
                var req_fields = $('.thwepof-input-field.validate-required');
                var disabled = false;
                
                $.each(req_fields, function(index, elm){
                    var value = '';
                    var finput = $(elm);

                    var type = finput.getType();
                    var name = finput.prop('name');

                    if(type == 'radio'){
                      value = $("input[type=radio][name='"+name+"']:checked").val();

                    }else if(type == 'checkbox'){
                      value = $("input[type=checkbox][name='"+name+"']:checked").val();

                    }else{
                      value = finput.val();
                    }
                
                    if(isEmpty(value)){
                        disabled = true;
                    }
                });
                $('.single_add_to_cart_button').prop("disabled", disabled);
            }

            $.fn.getType = function(){
              try{
                return this[0].tagName == "INPUT" ? this[0].type.toLowerCase() : this[0].tagName.toLowerCase(); 
              }catch(err) {
                return 'E001';
              }
            }

            function isEmpty(str){ 
              return (!str || 0 === str.length); 
            }

            $('.thwepof-input-field').on('keyup change', function(){
                may_disable_add_to_cart_button();
            });
            may_disable_add_to_cart_button();
            
        }(window.jQuery, window, document));
    </script>
<?php
}
add_action('wp_footer', 'disable_add_to_cart_till_required_fields_filled');

Sometimes, while copying the code, the format of the double quotes and single quotes will get change. If you are facing any issue, please remove the double quotes and single quotes in the code and add it again.

We hope this will help.

Thank you!

Great!