How to validate two check boxes and make sure that at least one is checked?

Question

I have two check boxes in my form, all other form fields use HTML attribute required so I can run validation on submit. This is little different since I have two check box input fields and I have to require at least one to be checked. Here is an example:

$('.frm-Submit').on('submit', submitFrm);
function submitFrm(e){
    e.preventDefault(); // Prevnts default form submit.
    var $checkbox = $('.account-type');

    $checkbox.on('change', function(){
        var checked = false;
  
        $checkbox.each(function(){
           checked = checked || $(this).is(':checked')
        });
  
        $checkbox.prop('required', !checked)
    });

    console.log('Submit form.')
}

.form-group.required .control-label:after {
    content: " *";
    color: red;
}

<script language="javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script language="javascript" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">

<form name="frmSave" id="frmSave" class="frm-Submit" autocomplete="off">
  <div class="form-group required">
    <label class="control-label" for="account"><span class="label label-primary">Account Type:</span></label>
    <div class="checkbox">
      <label for="user">
         <input type="checkbox" name="frm_isuser" id="frm_isuser" data-toggle="collapse" data-target="#user-account" required class="account-type"> <span class="label label-default">User</span>
      </label>
      <label for="staff">
         <input type="checkbox" name="frm_isstaff" id="frm_isstaff" data-toggle="collapse" data-target="#staff-account" required class="account-type"> <span class="label label-info">Staff</span>
      </label>
    </div>
  </div>
   <div class="row">
     <div class="form-group col-xs-12 col-sm-12 col-md-1 col-lg-1">
       <button type="submit" name="frm_submit" id="frm_submit" class="btn btn-primary">Submit</button>
     </div>
   </div> 
</form>

Example above throws an error isUser.checkValidity() is not a function. Is there a way to run validity on checkbox and make at least one of the two required/checked?

Answer 1

$("#frm_isuser").is(":checked") will return a bool that shows if $("#frm_isuser") is checked or not.

And checkValidity() is a DOM methods, so you should use document.getElementById("frm_isuser").checkValidity() or $("#frm_isuser")[0].checkValidity().

Edit: If one of the both checkboxes is checked, then set required attributes to false to both of them. If none of them is checked, set required to true.

$('.frm-Submit').on('submit', submitFrm);

var $checkbox = $('.custom-class')

$checkbox.on('change', function(){
  var checked = false;
  
  $checkbox.each(function(){
    checked = checked || $(this).is(':checked')
  })
  
  $checkbox.prop('required', !checked)
})

function submitFrm(e) {
  e.preventDefault(); // Prevnts default form submit.
  
  console.log('Submit form.')
}

.form-group.required .control-label:after {
  content: " *";
  color: red;
}

<script language="javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script language="javascript" src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">

<form name="frmSave" id="frmSave" class="frm-Submit" autocomplete="off">
  <div class="form-group required">
    <label class="control-label" for="account"><span class="label label-primary">Account Type:</span></label>
    <div class="checkbox">
      <label for="user">
         <input type="checkbox" name="frm_isuser" id="frm_isuser" data-toggle="collapse" data-target="#user-account" required class="custom-class"> <span class="label label-default">User</span>
      </label>
      <label for="staff">
         <input type="checkbox" name="frm_isstaff" id="frm_isstaff" data-toggle="collapse" data-target="#staff-account" required class="custom-class"> <span class="label label-info">Staff</span>
      </label>
    </div>
  </div>
  <div class="row">
    <div class="form-group col-xs-12 col-sm-12 col-md-1 col-lg-1">
      <button type="submit" name="frm_submit" id="frm_submit" class="btn btn-primary">Submit</button>
    </div>
  </div>
</form>