Strategies for successfully passing and showcasing the result of a calculation on a fresh view or component within Angular

I have developed a basic calculator application with two main components: Calculator and Result. The Angular router is used to navigate between these components. Now, I am looking for a way to dynamically display the calculation result from the Calculator component in the Result component. Can you suggest some methods to achieve this? https://i.sstatic.net/AhQMz.png

https://i.sstatic.net/lcLip.png

calculator.component.ts


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

  public number1: number;
  public number2: number;
  public result: number;

  constructor() {
  }

  sum() {
    this.result = this.number1 + this.number2;
  }

  diff() {
    this.result = this.number1 - this.number2;
  }

  mult() {
    this.result = this.number1 * this.number2;
  }

  divi() {
    this.result = this.number1 / this.number2;
  }

  ngOnInit(): void {

  }

}

calculator.component.html

<!DOCTYPE html>
...
</html>

app-routing.module.ts

import { NgModule } from '@angular/core';
...
export class AppRoutingModule { }

app.component.html

<h1>Angular Router</h1>
...
</nav>
<router-outlet></router-outlet>

data.service.ts

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

@Injectable({
  providedIn: 'root'
})
export class DataService {

  constructor() { }
}

Answer №1

If you're looking for ways to achieve this task, here are a couple of approaches you can consider:

  1. One straightforward method is to utilize the state property when navigating from the calculator route to the result route.
this.router.navigate(['result'], { state: { result } });

By doing this, your result will be stored in the window.history.state object, allowing you to retrieve it in the result component.

ngOnInit() {
    this.resultValue = window.history.state.result;
}

Check out the demo


2. Another option is to save the result in a shared service and then access that data within the result component. Simply inject the service where needed and retrieve the stored information from it.

@Injectable()
export class SharedServiceService {
  storeValue: number = 0;
  constructor() { }
}

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