javascript - Angular - 检查多个子组件是否脏

Question

我有一些子组件持有 form - 表单的值将从父组件发送 - 我已在父组件中循环子组件并将数据传递给组件

子组件

<form #formType="ngForm">
    <div class="col-lg-4" *ngFor="let data of productSizes; let i = index;">
        <div class="inlinediv" *ngFor="let item of data.ItemDetails">
            <div class="marginright15 inlinediv">
                <ng-container *ngIf="item.Foundation">
                    <b>{{item.Size.toUpperCase()}}</b><br />
                    <input *ngFor="let val of item.Foundation" type="text" appNumbericInput maxlength="4" [(ngModel)]="val.Val" class="inputcustom text-right" [disabled]="(val.Val == null ? true : false) || disableChecker" (input)="enableSave=true" />
                </ng-container>
            </div>
        </div>
    </div>
</form>

子组件.ts

@Component({
    selector: 'app-base-mattress',
    templateUrl: './base-mattress.component.html',
    styleUrls: ['./base-mattress.component.css']
})

export class BaseMattressComponent implements OnInit {
    @Input() productSizes: IItemDetails[];
    @ViewChild('formType') formVariable: NgForm;
    blobURL: string = environment.blobURL;
    constructor() {}
    ngOnInit() {}
}

父组件 html

<ng-container *ngFor="let slot of slotRequests; let j = index;">
    <ng-container *ngIf="slot.ItemGrouping.toLowerCase() === 'mattress'">
        <ng-container *ngFor="let data of slotRequests[j].Data; let i = index;">
            <app-base-mattress [productSizes]="data"></app-base-mattress>
        </ng-container>
    </ng-container>
</ng-container>

现在我的问题是我想读取子组件表单变量？ 我不想订阅服务并检查 form 是否脏了，我试了很多次了，还是不行。

我尝试用这样的模板引用变量映射我的 child <app-base-mattress [productSizes]="data" #childData></app-base-mattress> 但似乎我正在循环子组件，因此它似乎不能充当特定组件的引用变量 - 请帮助我找出如何读取子组件表单变量

我的 StackBlitz 的工作版本

提前致谢!!

Answer 1

在顶级组件中使用表单元素

<form #formType="ngForm">
    <ng-container *ngFor="let slot of slotRequests; let j = index;">
        <ng-container *ngIf="slot.ItemGrouping.toLowerCase() === 'mattress'">
            <ng-container>

                <div *ngFor="let data of slotRequests[j].Data; let i = index;">
                    <app-base-mattress [productSizes]="data.ItemDetails"></app-base-mattress>
                </div>

            </ng-container>
        </ng-container>
    </ng-container>
</form>

使用 viewproviders 提供 concontainer，它是 formDirectives 的父类(super class)，使用现有的 ngForm 组将您的表单组合在一起

import { Component, OnInit, ViewChild, Input } from '@angular/core';
import { NgForm, ControlContainer } from '@angular/forms'

@Component({
  selector: 'app-base-mattress',
  templateUrl: './base-mattress.component.html',
  styleUrls: ['./base-mattress.component.css'],
  viewProviders: [{ provide: ControlContainer, useExisting: NgForm }]
})
export class BaseMattressComponent implements OnInit {
  @Input() productSizes: any[];

  constructor() { }

  ngOnInit() {
  }

}

示例:https://stackblitz.com/edit/angular-ch5yh2