如何在不使用服务的情况下在子组件与父组件之间传递反应式表单数据 [英] How to pass reactive form data between child to parent components with out using services

问题描述

点击父按钮的话想从父母那里消费儿童反应形式数据。目前我们正在使用viewchild获取子cpomponent引用。我们获取所有静态数据但不填写表格填充数据...................................... .................................................. ...............

We would like to consume child reactive form data from parent when we click on parent button. Currently we are using viewchild for getting the child cpomponent reference. We are getting all static data but not the form filled data.......................................................................................................

parent.component.ts
@ViewChild(DetailsComponent) childrenComponent: childrenComponent;

save(){
let model=this.childrenComponent.buildDetailsModel();
/*here api to save model*/
}
children.component.ts
buildDetailsModel(): Details {
var a = {
  reportedToId: this.detailsForm.get('reportedTo').value,
  reportedOn: this.detailsForm.get('reportedTime').value,
  identifiedById: this.detailsForm.get('identifiedBy').value,
  identifiedOn: this.detailsForm.get('dateAndTimeIdentified').value,
  locationTypeId: this.detailsForm.get('locationType').value,
  addressId: this.detailsForm.get('locationAddress').value,
  AddressLine: this.detailsForm.get('locationOfAddress').value,
  description: this.detailsForm.get('description').value,
  PeopleExposed: this.dataSource
  };
  return a;
}

parent.html 
<child></child>

child.html
<form [formGroup]="detailsForm">
  <div fxLayout="column wrap" fxLayoutGap="12px">

    <div fxLayout="column" fxLayout.lt-sm="column" fxLayout.lt-md="column" 
   fxLayoutGap="24px">

      <div fxFlex="row" fxLayoutGap="24px" fxLayout.lt-md="column">
        <div fxFlex="column">
          <mat-form-field>
            <mat-label>Reported To</mat-label>
            <mat-select matInput formControlName="reportedTo">
              <mat-option value="Test 1">Test 1</mat-option>
              <mat-option value="Test 2">Test 1</mat-option>
            </mat-select>
          </mat-form-field>


          <mat-form-field>
            <input matInput [matDatepicker]="reportedTime" placeholder="Date 
          and time reported" date="true" time="true" 
          formControlName="reportedTime">
            <mat-datepicker-toggle matSuffix [for]="reportedTime"></mat- 
           datepicker-toggle>
            <mat-datepicker #reportedTime></mat-datepicker>
          </mat-form-field>

          <mat-form-field>
            <mat-label>Identified by</mat-label>
            <mat-select matInput formControlName="identifiedBy">
              <mat-option value="Test 1">Test 1</mat-option>
              <mat-option value="Test 2">Test 1</mat-option>
            </mat-select>
          </mat-form-field>
        </div>

推荐答案

包装您的子表单内部表单元素，以便您可以从父级提交您的子表单，然后在子组件中注入FormGroupDirective以获取父表单的引用

Wrap your child form Inside form element so that you can submit your child form from parent, Then Inject FormGroupDirective in child component to get ref of parent form

<form (ngSubmit)="save()" [formGroup]="detailsForm"> 
    <app-child></app-child>
    <button type="button">Save</button>
 </form>

然后使用controlContainer在子组件中提供现有的FormGroupDirective

Then use controlContainer to provide the existing FormGroupDirective in child component

childcomponent.ts

  form;
  constructor(private fb: FormBuilder, @Host() private parentFor: FormGroupDirective) { }

  ngOnInit() {
    this.form = this.parentFor.form;
    //Add FormControl as per your need
    this.form.addControl('child', this.fb.group({
      name: "",
      email: ""
    }))

  }

孩子。 component.html

<form formGroupName="child">
  <input formControlName="name">
  <input formControlName="email">
</form>

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

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