Angular 如何在角材料步进机中使用一个按钮提交多个表格？

根据我的用户界面，情况与这个问题完全不同

我的设想是，我必须创建一个带有多个表单的步进器。以便。我已将每个表单分配到各个组件中。而且，我的按钮应该在stepper组件中，每个表单组件只有一个按钮。每当我提交表单时，我都会单击stepper submit按钮，该按钮将保存表单。因此，我使用EventEmitter从stepper组件捕获ngSumbit。但它给了我一个错误，ngSubmit是未定义的。我的

parent.stepper.component.html

是

<hr>
<div fxLayout="row" fxLayoutGap="70vw">
<button (click)="child1Form.ngSubmit.emit();child2Form.ngSubmit.emit();child3Form.ngSubmit.emit()"  type="submit" mat-raised-button class="btn-submit">Save</button>
</div>
<hr>  
<mat-horizontal-stepper #stepper>
  <mat-step [stepControl]="firstFormGroup" >
      <ng-template matStepLabel>Child1</ng-template>
      <app-child1-form></app-child1-form>
      <div>
          <button mat-button matStepperNext>Next</button>
      </div>
  </mat-step>
  <mat-step [stepControl]="secondFormGroup">
      <ng-template matStepLabel>Child2</ng-template>
      <app-child2-form></app-child2-form>
      <div fxLayout="row" fxLayoutGap="70vw">
          <button mat-button matStepperPrevious>Back</button>
          <button mat-button matStepperNext>Next</button>
        </div>
  </mat-step>
  <mat-step>
      <ng-template matStepLabel>Child3</ng-template>
      <app-child3-form></app-child3-form>
      <div fxLayout="row" fxLayoutGap="70vw">
          <button mat-button matStepperPrevious>Back</button>
          <button mat-button matStepperNext>Next</button>
        </div>
  </mat-step>
  <mat-step>
      <ng-template matStepLabel>Done</ng-template>
      You are now done.
      <div>
          <button mat-button matStepperPrevious>Back</button>
          <button mat-button (click)="stepper.reset()">Reset</button>
      </div>
  </mat-step>
</mat-horizontal-stepper>

我孩子的一个表单看起来像

child1form.component.html

<form #child1Form="ngForm" fxLayout="row wrap" [formGroup]="firstFormGroup" fxLayoutGap="10px" (ngSubmit)="saveChild1Form()" fxLayoutAlign="center baseline">
  <mat-card-content fxLayout="column">
    <!-- Activity -->
    <mat-form-field appearance="outline">
      <mat-label>Description </mat-label>
      <textarea  required matInput formControlName="firstCtrl"  ng-trim="false" ></textarea>
    </mat-form-field>
  </mat-card-content>
</form>

所有的子形式都是相似的。所以我没有在这里写其他子组件。我的问题是，每当我在

parent.stepper.component.html

中单击save按钮时，就会出现

ngSubmit未定义的错误。谁能指导我解决这个问题

谢谢
尽量利用模板中的ng内容

您的子组件模板应该是

在父组件中

...
<app-child1-form>
 <form [formGroup]="first">
  <label for="firstname">First name </label>
  <input type="text" formControlName="firstname">
</form>
</app-child1-form>
...
<app-child2-form>
<form [formGroup]="second">
 <label for="firstname">Middle name </label>
 <input type="text" formControlName="middlename">
</form>
</app-child2-form>
...
<app-child3-form>
 <form [formGroup]="third">
 <label for="firstname">Last name </label>
 <input type="text" formControlName="lastname">
</form>
</app-child3-form>
...

<button type="submit" (click)="save()">Submit</button>

import { FormGroup, FormControl, FormBuilder, Validators } from '@angular/forms';

  constructor(private fb: FormBuilder) { 
  this.first = this.fb.group({
    firstname: ['', Validators.required]
  })
  this.second = this.fb.group({
    middlename: ['', Validators.required]
  })
  this.third = this.fb.group({
    lastname: ['', Validators.required]
  })
}

您的save方法应该是

save() {
  if(this.first.valid) { // or you should have the condition based on your requirement
    console.log(this.first.value)
  } else if(this.second.valid) {
     console.log(this.second.value)
  } else if(this.third.valid) {
    console.log(this.third.value)
  } else {
    return;
  }
}

希望这对您有所帮助
您是想在每个提交按钮上将每个表单保存到后端，还是想保存每个表单的结果列表感谢您的回复，@Suryan我想在每次提交时将每个表单单独保存到后端。如果您能在stackblitzNope上做一个演示就太好了，您无法理解。这个解决方案对我没有帮助。这个我知道。我需要单独的组件形式。不是所有的形式都在一个组件中，你能理解吗@苏里安
...
<app-child1-form>
 <form [formGroup]="first">
  <label for="firstname">First name </label>
  <input type="text" formControlName="firstname">
</form>
</app-child1-form>
...
<app-child2-form>
<form [formGroup]="second">
 <label for="firstname">Middle name </label>
 <input type="text" formControlName="middlename">
</form>
</app-child2-form>
...
<app-child3-form>
 <form [formGroup]="third">
 <label for="firstname">Last name </label>
 <input type="text" formControlName="lastname">
</form>
</app-child3-form>
...

<button type="submit" (click)="save()">Submit</button>

import { FormGroup, FormControl, FormBuilder, Validators } from '@angular/forms';

  constructor(private fb: FormBuilder) { 
  this.first = this.fb.group({
    firstname: ['', Validators.required]
  })
  this.second = this.fb.group({
    middlename: ['', Validators.required]
  })
  this.third = this.fb.group({
    lastname: ['', Validators.required]
  })
}

save() {
  if(this.first.valid) { // or you should have the condition based on your requirement
    console.log(this.first.value)
  } else if(this.second.valid) {
     console.log(this.second.value)
  } else if(this.third.valid) {
    console.log(this.third.value)
  } else {
    return;
  }
}