Question

我正在创建一个表单，用户可以选择日期并填写表单并提交该表单，这就是我所拥有的。供参考，我正在使用igx-calendar

日历component.ts：

import { Component, OnInit, forwardRef, Input, ElementRef, ViewChild } from '@angular/core';
import { IgxCalendarComponent, IgxDialogComponent } from 'igniteui-angular';
import {  NgModel, FormControl, ControlValueAccessor, NG_VALUE_ACCESSOR, NG_VALIDATORS } from '@angular/forms';
@Component({
  selector: 'app-calendar',
  templateUrl: './calendar.component.html',
  styleUrls: ['./calendar.component.scss'],
  providers: [
    { provide: NG_VALUE_ACCESSOR, useExisting: forwardRef(() => CalendarComponent), multi: true }
  ]
})
export class CalendarComponent implements ControlValueAccessor, OnInit {
  @ViewChild('calendar') public calendar: IgxCalendarComponent;
  @ViewChild('alert') public dialog: IgxDialogComponent;
  @Input()
  label: string;


  private _theDate: string;

  constructor() { }

  propagateChange = (_: any) => { };
  onTouched: any = () => { };

  writeValue(obj: any): void {
    console.log('writeValue => obj : ', obj);
    if (obj) {
      this._theDate = obj;
    }
  }

  registerOnChange(fn: any): void {
    this.propagateChange = fn;
    console.log('registerOnChange => fn : ', fn);
  }

  registerOnTouched(fn: any): void {
    this.onTouched = fn;
    console.log('registerOnTouched => fn : ', fn);
  }

  get theDate() {
    console.log('get theDate()');
    return this._theDate;
  }

  set theDate(val) {
    console.log('set theDate(val) - val => ', val);
    this._theDate = val;
    this.propagateChange(val);
  }
  public verifyRange(dates: Date[]) {
    if (dates.length > 5) {
      this.calendar.selectDate(dates[0]);
      this.dialog.open();
    }
  }
  ngOnInit() {

  }
}

calender.html

<div class="sample-wrapper">
    <div class="sample-content">
        <!-- Single selection mode -->
        <article class="sample-column calendar-wrapper">
            <igx-calendar></igx-calendar>
        </article>

    </div>
</div>

Booking.component.ts 更新

export class BookingComponent implements OnInit {

  comments: {};
  addcomments: Comment[];
  angForm: FormGroup;
  // tslint:disable-next-line:max-line-length
  validEmail = false;

  constructor(private flashMessages: FlashMessagesService,
    private fb: FormBuilder,
    private activeRouter: ActivatedRoute,
    private moviesService: MoviesService) {
    this.comments = [];
    this.createForm();
    }
  onChange(newValue) {
    // tslint:disable-next-line:max-line-length
    const validEmail = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    if (validEmail.test(newValue)) {
      this.validEmail = true;
    } else {
      this.validEmail = false;
    }

  }

  createForm() {
    this.angForm = this.fb.group({
      email: new FormControl('', [Validators.required, Validators.email])
    });
  }
  addReview(date, email, city, hotel) {
    this.moviesService.addReview(date, email, city, hotel).subscribe(success => {
      this.flashMessages.show('You are data we succesfully submitted', { cssClass: 'alert-success', timeout: 3000 });
      // get the id
      this.activeRouter.params.subscribe((params) => {
        // tslint:disable-next-line:prefer-const
        let id = params['id'];
        this.moviesService.getComments(id)
          .subscribe(comments => {
            console.log(comments);
            this.comments = comments;
          });
      });
    }, error => {
      this.flashMessages.show('Something went wrong', { cssClass: 'alert-danger', timeout: 3000 });
    });
  }
  ngOnInit() {

  }

}

Booking.component.html

<div class="row about-booking">
    <flash-messages></flash-messages>
    <form [formGroup]="angForm" class="form-element">
      <div class="col-sm-4 offset-sm-2 about-booking_calendar">
        <div class="form-group form-element_date">
          <app-calendar formControlName="date" [(ngModel)]="theDate" #date></app-calendar> 
        </div>
      </div>
      <div class="col-sm-4 about-booking_form">
        <div class="form-group form-element_email">
          <input type="email" class="form-control info" placeholder="Email" formControlName="email" #email (ngModelChange)="onChange($event)">
        </div>
        <div *ngIf="angForm.controls['email'].invalid && (angForm.controls['email'].dirty || angForm.controls['email'].touched)"
          class="alert alert-danger">
          <div *ngIf="angForm.controls['email'].errors.required">
            Email is required.
          </div>
        </div>
        <div class="input-group mb-3 form-element_city">
          <select class="custom-select" id="inputGroupSelect01" #cityName>
            <option selected *ngFor="let city of cities" [ngValue]="city.name">{{city.name}}</option>

          </select>
        </div>
        <div class="input-group mb-3 form-element_hotel">
          <select class="custom-select" id="inputGroupSelect01" #hotelName>
            <option selected *ngFor="let hotel of hotels" [ngValue]="hotel.name">{{hotel.name}}</option>

          </select>
        </div>
        <div class="form-group">
          <button type="submit" (click)="addReview(date.value, email.value, cityName.value , hotelName.value)" class="btn btn-primary btn-block form-element_btn"
            [disabled]="!validEmail">Book</button>
        </div>
      </div>
    </form>
  </div>

提交数据时，出现以下错误：

BookingComponent.html：59错误错误：找不到名称为的控件： '日期'

我的代码有什么问题？

Answer 1

在您的createForm（）函数中，您没有添加日期FormControl

createForm() {
  this.angForm = this.fb.group({
    email: new FormControl('', [Validators.required, Validators.email]),
    date: new FormControl('') // this line missing in your code
  });
}

您不应在同一输入中同时使用ngModel（模板驱动的表单）和formControlName（反应性表单）。

Answer 2

在我的情况下，我在FormGroup中的所有字段上都遇到了同样的错误，原因是未接收到来自服务器的数据，并且html UI代码试图执行反应形式，因此错误。因此，要解决此问题，我必须在form元素上使用* ngIf条件，并停止呈现表单，直到服务器响应完成为止。

<form [formGroup]="profileForm" (ngSubmit)="onSubmit()" *ngIf="userProfile != undefined">

角度6：找不到名称为“ date”的控件

2 个答案: