gravity-forms-auto-advance-demo.js

<script type="text/javascript">
(function($){
	
  // update this value as needed
	var scrollOffset = 30;

  $(document).bind('gform_post_render', function(e, formId, currentFormPage) {
		
    var $form = $('#gform_' + formId);

    if ( $form.hasClass('auto-advance') && !$form.hasClass('auto-advance-init') ) {

      $form.find('.gsection').not(':first').each(function(){

        var $section = $(this);
				$section.addClass('inactive');
				
        if ( $section.hasClass('collapsible-sections-field') ) {
					$section.next('.collapsible-sections-collapsible-body').addClass('inactive');
				}
				else {
					$section.nextUntil('.gsection').addClass('inactive');
				}

      });
			
      $form.find('.gform_footer input:submit, .gform_footer button').addClass('inactive').prop('disabled', true);
			
      var firstRun = true;
			
      $form.find('input:radio').on('change', function(e){

        var $input = $(this);
				
        if ( $input.is(':checked') ) {

          var $field = $input.closest('.gfield');
					var $nextSection;
					var nextSectionScrollDelay = 10;

          if ( $field.closest('.collapsible-sections-collapsible-body').length ) {
						$nextSection = $field.closest('.collapsible-sections-collapsible-body').nextAll('.gsection').first();
					}
					else {
						$nextSection = $field.nextAll('.gsection').first();
					}
					
          if ( $nextSection.length ) {

            $nextSection.removeClass('inactive');
						
            if ( $nextSection.hasClass('collapsible-sections-field') ) {
							$nextSection.next('.collapsible-sections-collapsible-body').removeClass('inactive');
							nextSectionScrollDelay = 500;
							if ( !firstRun ) {
								$nextSection.trigger('click');
							}
						}
						else {
							$nextSection.nextUntil('.gsection').removeClass('inactive');
						}
						
            if ( !firstRun ) {
							setTimeout(function(){
								var targetTop = $nextSection.offset().top - scrollOffset;
								$('html,body').animate({ scrollTop: targetTop }, 300);			
							}, nextSectionScrollDelay);
						}

            if ( !$nextSection.nextAll('.gsection').length ) {
							$form.find('.gform_footer input:submit, .gform_footer button').removeClass('inactive').prop('disabled', false);
						}

          }
          
				}

      }).trigger('change');

      $form.addClass('auto-advance-init');
			
      setTimeout(function(){
				firstRun = false;
			}, 500);

    }

  });
})(jQuery);
</script>