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              <form>
  <div class="form-group">
    <label>姓名</label>
    <input class="form-control" data-toggle="tooltip" title="請輸入姓名">
  </div>
  <div class="form-group">
    <label>留言</label>
    <textarea class="form-control" data-toggle="tooltip" title="請填寫留言"></textarea>
  </div>
  <div class="form-group">
    <button type="submit" class="btn btn-primary">確認送出</button>
  </div>
</form>
            
          
!
            
              form{max-width:280px;margin:24px auto;
  .error{
    label{color:#e66;}
    input,textarea{background-color:#fee;border-color:#e99;}
  }
}
            
          
!
            
              // bootstrap tooltip
$('[data-toggle="tooltip"]').tooltip();

// 表單驗證
$('form').submit(function(){
    var isFormValid = true;
	  $(this).find('input, textarea').each(function(){
        var $this = $(this);
        // 使用 trim 把空白去除
        if ($.trim($this.val()).length === 0){
          $this.tooltip('show').closest('div').addClass('error');
          isFormValid = false;
        }else{
          $this.tooltip('destroy').closest('div').removeClass('error');
        }
    });
    return isFormValid;
});
            
          
!
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