如何验证两个复选框并确保至少选中一个？

Question

我的表单中有两个复选框，所有其他表单字段都使用必需的 HTML 属性，以便我可以在提交时运行验证。这有点不同，因为我有两个复选框输入字段，并且我必须要求至少检查一个。这是一个例子：

$('.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>

上面的例子抛出一个错误isUser.checkValidity()不是一个函数。有没有一种方法可以在复选框上运行有效性并使两者中的至少一个成为必需/选中？

Answer 1

$("#frm_isuser").is(":checked")将返回一个布尔值，显示是否$("#frm_isuser")已检查。

并且checkValidity()是一个 DOM 方法，所以你应该使用document.getElementById("frm_isuser").checkValidity()or $("#frm_isuser")[0].checkValidity()。

编辑：如果选中两个复选框之一，则将required属性设置false为这两个复选框。如果均未选中，则设置required为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>