JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.2.3.min.js"></script>
<form id="students" method="">
                  <div class="row">
                      <input id="aa" name="a[]" value="Smith" type="text" class="a1" >
                      <input id="bb" name="b[]" value="Alen" type="text" class="b1" >
                      <input id="save" name="save[]" value="" type="checkbox" class="ab" disabled="disabled" >
                  </div>
                  <div class="row">
                      <input id="aa" name="a[]" value="" type="text" class="a1"  >
                      <input id="bb" name="b[]" value="" type="text" class="b1" >
                      <input id="save" name="save[]" value="" type="checkbox" class="ab"  >
                  </div>
                  <div class="row">
                      <input id="aa" name="a[]" value="Bill" type="text" class="a1"   >
                      <input id="bb" name="b[]" value="Mark" type="text" class="b1" >
                      <input id="save" name="save[]" value="" type="checkbox" class="ab" >
                  </div>
                  <div class="row">
                      <input id="aa" name="a[]" value="" type="text" class="a1"  >
                      <input id="bb" name="b[]" value="" type="text" class="b1" >
                      <input id="save" name="save[]" value="" type="checkbox" class="ab" >
                  </div>
                  <div class="row">
                      <input id="aa" name="a[]" value="Kell" type="text" class="a1"  >
                      <input id="bb" name="b[]" value="Keith" type="text" class="b1" >
                      <input id="save" name="save[]" value="" type="checkbox" class="ab" >
                  </div>
            <input type="button" value="submit" id="submitbutton" class="insert"  />
</form>

JavaScript

function checkform() {
   var myForm = document.forms.students;
   $(myForm).find('input[name="a[]"], input[name="b[]"]').filter(function(){
   			if(!$.trim(this.value)){
        	$(this).siblings('.ab').prop('checked', true)
        }else{
        	$(this).siblings('.ab').prop('checked', false)
        }
   });
 }
 
 $('#submitbutton').on('click', function(){
 		checkform();
 })