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我希望在組件發生更改時觸發必需字段驗證。該組件上有多個必填字段，需要填寫以便用戶進入下一頁。我的想法是激發我的函數，該函數檢查必填字段是否有空或空。如何在角度4中使用更改檢測
我的問題是，我無法找到任何關於如何實現這個的例子。以下是我迄今得到的。
import { Component, Injectable, OnInit, Input, ChangeDetectorRef } from '@angular/core'
import { HttpModule } from '@angular/http';
import { CarReqFormService } from './carReqForm.service';
import { DropDownListItem } from './carReq-dropdownItem';
import { IMyOptions, IMyDateModel } from 'ngx-mydatepicker';
import { surgeryReservationModel } from './carReservationModel';
import { Router, ActivatedRoute, Params } from '@angular/router';
import { Location } from '@angular/common';
import 'rxjs/add/operator/switchMap';
import { AutoCompleteBoxRequest } from './autoCompleteBoxRequest';
@Component({
moduleId: module.id,
selector: 'uh-carReservationFormPage3',
templateUrl: './carReservationFormPage3.html',
providers: [carReqFormService]
})
export class carReservationFormPage3Component implements OnInit {
SurgicalPositionItems: DropDownListItem[];
private loading: boolean = true;
carReservationModel = new carReservationModel();
public isBusy: boolean;
constructor(private _carRequestFormService: carReqFormService,
private route: ActivatedRoute ,
private _router: Router,
private ref: ChangeDetectorRef) {
}
ngOnInit(): void {
this.getActivecaricalPositions();
this.isBusy = true;
var test;
this.route.params
.switchMap((params: Params) => this._carRequestFormService.getcarRequestById(+params['id']))
.subscribe(
data => {
this.carReservationModel = data;
this.isBusy = false;
},
error => {
console.log("Error", error);
this.isBusy = false;
},
() => {
console.log("Inside NgOnInit on Page 3" + this.carReservationModel.carRequestId);
this.isBusy = false;
});
}
}
是否有一個函數會觸發任何更改，我可以調用我的函數來觸發驗證規則？
只要Angular爲組件執行變更檢測，就會觸發ngDoCheck，@Input變更時會觸發onChanges，但沒有其他 –