mintUI之MessageBox表單驗證

<div class="mobileTrainActivityDetailButton_css">
	<mt-button v-if="path=='/mobileMyTrains'?true:false" @click.native="leave" size="large"> 請假 </mt-button>
</div>

//方法體里面
leave() {
　　 MessageBox.prompt('請假理由', {
	inputValidator: (val) => {
		 if (val === null) {
		　　 return true;//初始化的值為null，不做處理的話，剛打開MessageBox就會校驗出錯，影響用戶體驗
		 }
		 return !(val.length < 100)
	　　}, inputErrorMessage: '不能小於100字'
	 }).then((val) => {
		this.loading = true;
		var leaveForm = {
			trainId: this.trainInfo.trainId,
			leaveFlow: this.trainInfo.leaveFlow,
			leaveReason: val,
		};
		this.postRequest("/tmsproxy/trainLeave", leaveForm).then(resp => {
			this.loading = false;
			if(resp.data.status == "success") {
				MessageBox.alert(resp.data.msg, "");
			}
		})
	 }, () => {
		 console.info('cancel')
	  })
}