modal里确认按钮对form的提交 - WXOPEN Club

modal里有一个input，然后点击确认按钮来提交取消原因，此时应该如何传递给server端？modal里的bindconfirm如何获取form里的detail.value

<form bindsubmit="formSubmit_Cancel" id="cancelForm">

<modal title="取消活动" confirm-text="确认取消" cancel-text="放弃" bindconfirm="bindCancelConfirm" bindcancel="bindCancelCancel" wx:if="{{isSponsorCancelDialogShown}}">

<input name="cancelDesc" placeholder='可填写活动取消原因' maxlength='30' class='modalInput' />

</modal>

</form>