https://fogas.com.br/app/plugins/simple-contact-form-7-wizard-multisteps-form/assets/js/wizard-js.js?ver=1.0

1jQuery(document).ready(function($) {
2    $("section[data-step]").hide();
3    $("button.button-back").hide();
4    $("section[data-step=1]").show();
5    //next button 
6       $("button.button.button-next").click(function(e) {
7        e.preventDefault();
8        var step = jQuery(this).closest("section").data("step");
9        var isValid = true;
10        $("section[data-step='" + step + "'] [aria-required]").each(function(idx, elem) {
11            $(elem).removeAttr("style");
12            if($(elem).val().trim() === "") {
13                isValid = false;
14                $(elem).css({"border":"2px solid red"});
15            }
16        });
17        if(isValid) {
18            step += 1;
19            $("section").data("step", step);
20            $("section[data-step]").hide();
21            $("section[data-step='" + step + "']").show();
22            $("button.button-back").show();     
23        }
24    });
25    ////back
26    $("button.button-back").click(function(e) {
27        e.preventDefault();
28        var step = $("section").data("step");
29        step -= 1;
30        $("section").data("step", step);
31        $("section[data-step]").hide();
32        $("section[data-step='" + step + "']").show();
33        if(step === 1) {
34            $("button.button-back").hide();
35        }
36    });
37    
38       ///step back to error
39	$(".wpcf7 input.wpcf7-submit").click(function(e) {
40		var form = $(this).parents('form');
41		setTimeout(function(){
42			 form.find(".wpcf7-form-control").each(function(idx, elem) {
43				if($(elem).hasClass('wpcf7-not-valid')) {
44					var step = $(elem).parents("section").data("step");
45					form.find("section[data-step]").hide();
46					form.find("section[data-step='" + step + "']").show();
47				}
48			});
49		},1000);
50	});
51    
52});