$('#myModalForm').bootstrapValidator({
 message: 'This value is not valid',
 excluded : [':disabled'],//[':disabled', ':hidden', ':not(:visible)'] //设置隐藏组件可验证
 feedbackIcons: {
 valid: 'glyphicon glyphicon-ok',
 invalid: 'glyphicon glyphicon-remove',
 validating: 'glyphicon glyphicon-refresh'
 },
 fields: {
roleid: {
  message: '角色无效',
  validators: {
  notEmpty: {
  message: '角色不可为空'
  }
  }
 }
}
}）

<input type="hidden" class="form-control" id="roleid" name="roleid">
<select class="selectpicker form-control" multiple data-width="60%" id="roleidForSelect" title="---请选择---"></select>

 $('#roleidForSelect').on('hidden.bs.select', function (e) { //该方法注册到$(function(){})函数中
 var tmpSelected = $('#roleidForSelect').val();
 if(tmpSelected != null){
 $('#roleid').val(tmpSelected);
 }else {
 $('#roleid').val("");
 }
 //由于input为hidden，验证会出现一些bug，此处手动验证隐藏的input组件
 $('#myModalForm').data('bootstrapValidator').updateStatus('roleid', 'NOT_VALIDATED').validateField('roleid');
 });