Tips for sending data from a child component to a parent component

Question

Tips for sending data from a child component to a parent component

I am facing an issue with my components setup. I have 3 components - 2 child components and 1 parent component. The parent component has a save button, and in order to get data from the child components in the parent component, I have implemented the following code:

<div class="border border-dark p-1 m-1">
  <basic-details
    *ngIf="customerData"
    [formType]="formType"
    [customerDetails]="customerData"
    #customerDetails
  ></basic-details>
</div>
<div class="border border-dark p-1 m-1">
  <verification-details
    *ngIf="customerData"
    [formType]="formType"
    [customerDetailsForKyc]="customerData"
    #customerDetailsForKyc
  ></verification-details>
</div>

<div class="row main justify-content-center">
  <button class="btn btn-primary" (click)="save(customerDetails, customerDetailsForKyc)">Save</button>
  <button class="btn btn-primary ml-2" (click)="cancel()">Cancel</button>
</div>

ts file

save(basic, kyc) {
    console.log('basic', basic);
    console.log('kyc', kyc);
  }

When I click on the Save button, I am able to retrieve proper data from the basic-details component in the parent component. However, for the verification-details component, I am encountering an error. Both child components are using @Input() to receive data like this:

for basic component:

@Input() customerDetails: ICustomerDetailsData;

for verification component

@Input() customerDetailsForKyc;

Am I missing something here?

javascript angular typescript

Answer 1

Answer №1

I have successfully implemented your code with one parent component and two child components. I followed a similar approach to what you outlined in your initial query. One thing worth noting is that you did not specify the use of [formType]="formType", so I omitted it from my implementation. Feel free to review the code snippet below, which can be tested on StackBlitz: Angular two way data binding between parent and child co acqylp

import { Component, Input, Output, EventEmitter } from '@angular/core';

@Component({
  selector: 'app-root',
  template: `<app-children [(data)]="message"  
              [customerDetails]="customerData"
              #customerDetails></app-children>
             <br><br>
             <app-children2 [(data)]="message2" 
              
             [customerDetailsForKyc]="customerData"
             #customerDetailsForKyc></app-children2>
            <div>Parent: {{message}}
            <br>
            <button class="btn btn-primary" (click)="save(customerDetails, customerDetailsForKyc)">Save</button>
            </div>`,
})

export class AppComponent {
  public message: string;
  public message2: string;
  customerData:ICustomerDetailsData={color:'TTT',width:15};
  ngOnInit() {
    this.message = 'Original message'
    this.message2 = 'Original message2'
  }
  save(basic, kyc) {
    console.log('basic', basic);
    console.log('kyc', kyc);
  }
}

@Component({
  selector: 'app-children',
  template: `<div>Children: {{data}}</div> 
              <br>
              <input type="text" class="form-control" id="name"
     
              [(ngModel)]="data" >
              <br>
             <a (click)="changeMessage('Children message')">Click me!</a>`
})

export class ChildComponent {
  @Input() public data: string;
  @Input() customerDetails: ICustomerDetailsData;
  @Output() dataChange= new EventEmitter<string>();
  changeMessage(message: string) {
    this.data = message;
    this.dataChange.emit(this.data);
  }
}

 @Component({
  selector: 'app-children2',
  template: `<div>Children: {{data}}</div> 
             <a (click)="changeMessage('Children message')">Click me!</a>`
})

export class ChildComponentNew {
    @Input() customerDetailsForKyc;
  @Input() public data: string;
  @Output() dataChange= new EventEmitter<string>();
  changeMessage(message: string) {
    this.data = message;
    this.dataChange.emit(this.data);
  }
}
interface ICustomerDetailsData {
  color?: string;
  width?: number;
}

Answer 2

I have successfully implemented your code with one parent component and two child components. I followed a similar approach to what you outlined in your initial query. One thing worth noting is that you did not specify the use of [formType]="formType", so I omitted it from my implementation. Feel free to review the code snippet below, which can be tested on StackBlitz: Angular two way data binding between parent and child co acqylp

import { Component, Input, Output, EventEmitter } from '@angular/core';

@Component({
  selector: 'app-root',
  template: `<app-children [(data)]="message"  
              [customerDetails]="customerData"
              #customerDetails></app-children>
             <br><br>
             <app-children2 [(data)]="message2" 
              
             [customerDetailsForKyc]="customerData"
             #customerDetailsForKyc></app-children2>
            <div>Parent: {{message}}
            <br>
            <button class="btn btn-primary" (click)="save(customerDetails, customerDetailsForKyc)">Save</button>
            </div>`,
})

export class AppComponent {
  public message: string;
  public message2: string;
  customerData:ICustomerDetailsData={color:'TTT',width:15};
  ngOnInit() {
    this.message = 'Original message'
    this.message2 = 'Original message2'
  }
  save(basic, kyc) {
    console.log('basic', basic);
    console.log('kyc', kyc);
  }
}

@Component({
  selector: 'app-children',
  template: `<div>Children: {{data}}</div> 
              <br>
              <input type="text" class="form-control" id="name"
     
              [(ngModel)]="data" >
              <br>
             <a (click)="changeMessage('Children message')">Click me!</a>`
})

export class ChildComponent {
  @Input() public data: string;
  @Input() customerDetails: ICustomerDetailsData;
  @Output() dataChange= new EventEmitter<string>();
  changeMessage(message: string) {
    this.data = message;
    this.dataChange.emit(this.data);
  }
}

 @Component({
  selector: 'app-children2',
  template: `<div>Children: {{data}}</div> 
             <a (click)="changeMessage('Children message')">Click me!</a>`
})

export class ChildComponentNew {
    @Input() customerDetailsForKyc;
  @Input() public data: string;
  @Output() dataChange= new EventEmitter<string>();
  changeMessage(message: string) {
    this.data = message;
    this.dataChange.emit(this.data);
  }
}
interface ICustomerDetailsData {
  color?: string;
  width?: number;
}

Answer 3

Answer №2

If you need to pass data from a child component to its parent in Angular, one approach is to utilize the @ViewChild decorator to access the child component within the parent. This way, when an action like clicking a save button occurs, you can easily retrieve and work with the data from the child component. For more information, refer to Angular ViewChild documentation.

Answer 4

If you need to pass data from a child component to its parent in Angular, one approach is to utilize the @ViewChild decorator to access the child component within the parent. This way, when an action like clicking a save button occurs, you can easily retrieve and work with the data from the child component. For more information, refer to Angular ViewChild documentation.

Answer 5

Answer №3

Here is the revised content:

The approach you are using in your method, `save(customerDetails, customerDetailsForKyc)`, involves template variables as arguments. This practice is incorrect as template variables serve a different purpose. According to Angular documentation, "Template variables help you use data from one part of a template in another part of the template. With template variables, you can perform tasks such as respond to user input or finely tune your application's forms." Refer to Template variables | Angular for more information.
If you intend to transfer data from the child component to the parent component, it is recommended to utilize the @Output decorator. For detailed guidance on sharing data between child and parent directives and components in Angular, visit Sharing data between child and parent directives and components | Angular.

Answer 6

Here is the revised content:

The approach you are using in your method, `save(customerDetails, customerDetailsForKyc)`, involves template variables as arguments. This practice is incorrect as template variables serve a different purpose. According to Angular documentation, "Template variables help you use data from one part of a template in another part of the template. With template variables, you can perform tasks such as respond to user input or finely tune your application's forms." Refer to Template variables | Angular for more information.
If you intend to transfer data from the child component to the parent component, it is recommended to utilize the @Output decorator. For detailed guidance on sharing data between child and parent directives and components in Angular, visit Sharing data between child and parent directives and components | Angular.

Tips for sending data from a child component to a parent component

Answer №1

Answer №2

Answer №3

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