Swap references between two components at the same level

Question

Swap references between two components at the same level

There are two instances of custom-component spawned by a shared parent with distinct data, each displayed as a tab in the mat-tab-group.

<mat-tab-group>
  <mat-tab label="TAB1">
    <ng-template matTabContent>
      <custom-component [data]="tab1data"></custom-component>
    </ng-template>
  </mat-tab>
  <mat-tab label="TAB2">
    <ng-template matTabContent>
      <custom-component [data]="tab2data"></custom-component>
    </ng-template>
  </mat-tab>
</mat-tab-group>

The data attribute is utilized to set the internal _data which is then enclosed within MatTableDataSource:

@Input()
set data(val: Data[]) {
    this._data = val;
    this.loadData();
}

loadData(): void {
    this.dataSource = new MatTableDataSource<Data>(this._data);
    this.dataSource.sort = this.sort;
}

In certain scenarios, actions performed on the component within the first tab must impact the data displayed in the second tab. Is there a method to share references between components so that I can modify _data and initiate loadData() from another component?

angular typescript angular-material angular-components

Answer 1

Answer №1

If you're looking to establish communication between two components in Angular, RxJS observables can come in handy.

For a practical demonstration on how this can be achieved, check out this StackBlitz example: https://stackblitz.com/edit/angular-ivy-myr2kh

my-service.service.ts

import { Injectable } from '@angular/core';
import { Subject } from 'rxjs';

@Injectable()
export class MyServiceService {
  private dataChangeObservable = new Subject<any>();
    dataChangeStream = this.dataChangeObservable.asObservable();

  constructor() { }

  emitDataChange() {
    this.dataChangeObservable.next();
  }
}

ComponentOne.component.ts

onclickDiv() {
    this.myService.emitDataChange(); // This triggers the change event
}

ComponentTwo.component.ts

ngOnInit() {
    this.dataChangeSubscription$ = this.myService.dataChangeStream.subscribe(() => {
       this.count++; // This listens for and responds to the change event
    })
 }

Update

In scenarios where you have multiple instances of the same component, you'll need to identify which instance should receive updates.

Take a look at this modified example: https://stackblitz.com/edit/angular-ivy-4pznor

In your parent HTML:

<app-componentone [name]="'one'"></app-componentone>
<app-componentone [name]="'two'"></app-componentone>

Here, 'one' and 'two' are passed as inputs to distinguish between different instances.

Then, in your TypeScript file:

import { Component, OnInit, Input } from '@angular/core';
import { MyServiceService } from '../my-service.service';

@Component({
   selector: 'app-componentone',
   templateUrl: './componentone.component.html',
   styleUrls: ['./componentone.component.css']
})
export class ComponentoneComponent implements OnInit {
  @Input() name; // Stores the instance name
  count = 0;
  
  constructor(
     private myService: MyServiceService
  ) { }

  ngOnInit() {
    this.myService.dataChangeStream.subscribe((value) => { 
      if (this.name !== value) { 
         this.count++;
      }
    })
  }

  onclickDiv() {
    this.myService.emitDataChange(this.name); // Passes the instance name to trigger updates on specific components
  }
}

Answer 2

If you're looking to establish communication between two components in Angular, RxJS observables can come in handy.

For a practical demonstration on how this can be achieved, check out this StackBlitz example: https://stackblitz.com/edit/angular-ivy-myr2kh

my-service.service.ts

import { Injectable } from '@angular/core';
import { Subject } from 'rxjs';

@Injectable()
export class MyServiceService {
  private dataChangeObservable = new Subject<any>();
    dataChangeStream = this.dataChangeObservable.asObservable();

  constructor() { }

  emitDataChange() {
    this.dataChangeObservable.next();
  }
}

ComponentOne.component.ts

onclickDiv() {
    this.myService.emitDataChange(); // This triggers the change event
}

ComponentTwo.component.ts

ngOnInit() {
    this.dataChangeSubscription$ = this.myService.dataChangeStream.subscribe(() => {
       this.count++; // This listens for and responds to the change event
    })
 }

Update

In scenarios where you have multiple instances of the same component, you'll need to identify which instance should receive updates.

Take a look at this modified example: https://stackblitz.com/edit/angular-ivy-4pznor

In your parent HTML:

<app-componentone [name]="'one'"></app-componentone>
<app-componentone [name]="'two'"></app-componentone>

Here, 'one' and 'two' are passed as inputs to distinguish between different instances.

Then, in your TypeScript file:

import { Component, OnInit, Input } from '@angular/core';
import { MyServiceService } from '../my-service.service';

@Component({
   selector: 'app-componentone',
   templateUrl: './componentone.component.html',
   styleUrls: ['./componentone.component.css']
})
export class ComponentoneComponent implements OnInit {
  @Input() name; // Stores the instance name
  count = 0;
  
  constructor(
     private myService: MyServiceService
  ) { }

  ngOnInit() {
    this.myService.dataChangeStream.subscribe((value) => { 
      if (this.name !== value) { 
         this.count++;
      }
    })
  }

  onclickDiv() {
    this.myService.emitDataChange(this.name); // Passes the instance name to trigger updates on specific components
  }
}

Answer 3

Answer №2

Communication between tabs can be achieved by emitting an output event from the first tab to its parent component.

Within the Custom Component, define an output event like this:

@Output() public dataChange = new EventEmitter();

To emit this event when the data changes, use the following code:

this.dataChange.emit('changed data');

In the parent component where the selector of the Custom Component is used, adjust the selector as follows:

HTML :-

<custom-component [data]="tab1data" (dataChange)="modifyDataTab2($event)"></custom-component>

TS :-

modifyDataTab2(firstTabData) {
   this.tab2Data = firstTabData;
   // additional modifications can be made here
}

By setting up the communication in this way, any changes in tab2Data will automatically trigger the execution of loadData(). This approach eliminates the need to modify the Custom Component each time data needs to be changed between tabs.

If you want to update the data on tab1 based on changes on tab2, simply make adjustments in the parent component:

HTML :-

<custom-component [data]="tab2data" (dataChange)="modifyDataTab1($event)"></custom-component>

TS :-

modifyDataTab1(secondTabData) {
   this.tab1Data = secondTabData;
   // additional modifications can be made here
}

Utilizing a common parent component for communication ensures that any changes in shared data are efficiently propagated between child components without the need for direct communication between them.

Answer 4

Communication between tabs can be achieved by emitting an output event from the first tab to its parent component.

Within the Custom Component, define an output event like this:

@Output() public dataChange = new EventEmitter();

To emit this event when the data changes, use the following code:

this.dataChange.emit('changed data');

In the parent component where the selector of the Custom Component is used, adjust the selector as follows:

HTML :-

<custom-component [data]="tab1data" (dataChange)="modifyDataTab2($event)"></custom-component>

TS :-

modifyDataTab2(firstTabData) {
   this.tab2Data = firstTabData;
   // additional modifications can be made here
}

By setting up the communication in this way, any changes in tab2Data will automatically trigger the execution of loadData(). This approach eliminates the need to modify the Custom Component each time data needs to be changed between tabs.

If you want to update the data on tab1 based on changes on tab2, simply make adjustments in the parent component:

HTML :-

<custom-component [data]="tab2data" (dataChange)="modifyDataTab1($event)"></custom-component>

TS :-

modifyDataTab1(secondTabData) {
   this.tab1Data = secondTabData;
   // additional modifications can be made here
}

Utilizing a common parent component for communication ensures that any changes in shared data are efficiently propagated between child components without the need for direct communication between them.

Swap references between two components at the same level

Answer №1

Answer №2

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