在 ajax 提交之前，表单验证不适用于 jquery 步骤

如何解决在 ajax 提交之前，表单验证不适用于 jquery 步骤

在ajax提交之前表单验证不起作用。为什么这段代码有效？有人可以帮助我。我在这里通过添加HTML代码和ajax jquery步骤。

<form id="business_form">
<div class="cfield"><input type="text" placeholder="" name="businessName" id="businessName" required/>
 </div>
</form>

jquery 步骤..

  <script src="<?PHP echo base_url(); ?>admin_assets/assets/js/jquery.validate.js" type="text/javascript"></script>
  <script src="<?PHP echo base_url(); ?>admin_assets/assets/js/jquery.js" type="text/javascript"></script>

  onStepChanged: function(event,currentIndex,newIndex) { 
  if(currentIndex==1)
  {
  var business_form = document.getElementById('business_form');
  var formData = new FormData(business_form); 
  $("#business_form").validate();
   $.validator.setDefaults({
  submitHandler: function() {
  $.ajax({
            type: 'POST',url: "../business_save",data: formData,processData: false,contentType: false,success: function (data) {
           },error: function () {
             alert("something went wrong");
             return false; 
           }
          });
       }

    });

    }

请帮忙