Question

根据我的用户界面，情况与该问题完全不同

我的情况是我必须创建一个具有多种形式的步进器。以便。我已将每种形式分配到各个组件中。并且，“我的按钮”应该位于步进器组件中，对于每个表单组件而言，该按钮都是一个。每当我提交表单时，我都会单击“步进提交”按钮，该按钮将保存该表单。因此，我使用EventEmitter从步进器组件中捕获ngSumbit。但这给了我ngSubmit未定义的错误。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>

这是我的父组件。而且Child属于所有形式。像

<app-child1-form> </app-child1-form>
<app-child2-form> </app-child2-form>
<app-child3-form> </app-child3-form>

还有Parrent Stepper Component，我使用上方的一个保存按钮通过使用ngSubmit.emit()来提交孩子的发件人，这是按钮

<button (click)="child1Form.ngSubmit.emit();child2Form.ngSubmit.emit();child3Form.ngSubmit.emit()"  type="submit" mat-raised-button class="btn-submit">Save</button>

我孩子的一张表格看起来像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>

child1.component.ts文件是

import { Component, OnInit, Output, EventEmitter, Input, ViewChild } from '@angular/core';
import { FormGroup, FormBuilder, NgForm, FormGroupDirective } from '@angular/forms';

@Component({
  selector: 'app-child1-form',
  templateUrl: './child1-form.component.html',
  styleUrls: ['./child1-form.component.css']
})
export class Child1FormComponent implements OnInit {

  firstFormGroup: FormGroup;
 @Output() child1Form: EventEmitter<any> = new EventEmitter<any>();
  constructor(private _formBuilder: FormBuilder) { }

  ngOnInit() {
    this.firstFormGroup = this._formBuilder.group({
      firstCtrl: [''],
      secondtCtrl: ['']
    });
  }

  saveChild1Form() {
    console.log(this.firstFormGroup.value);
  }

}

所有子窗体相似。所以我没有在这里写其他子组件。我的问题是，每当我单击parent.stepper.component.html中的“保存”按钮时，就会出现错误ngSubmit is undefined。有人可以指导我解决这个问题吗？

谢谢

Answer 1

尝试在模板中利用ng-content

您的子组件模板应为<ng-content></ng-content>

在您的父组件中

...
<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>

在您的组件中

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]
  })
}

您的保存方法应该看起来

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;
  }
}

希望这可能对您有帮助

如何使用Angular Material Stepper中的一个按钮提交多个表单？

1 个答案: