What is the best way to transfer information between two components when working with an edit form?

Question

What is the best way to transfer information between two components when working with an edit form?

Presently, I am utilizing a modal material dialog window that prompts the user to input a number and then press search. Upon searching, it retrieves data from an API call and receives a response object. My goal is to utilize this response object to populate a new page (edit form).

My inquiry is, how can I transfer the data, specifically the number entered by the user on the material dialog component, to another component so that it can retrieve the API call results? Or how can I transmit my response object to my edit form from the dialog?

For example:

This is my search function:

search(searchNumber) {
    if (this.selectedOption === 'Bill Number') {
      this._transactionService.findExistingTransactionByBillNumber('U001', searchNumber)
                               .subscribe(data => this.transactionResponse = data);
      console.log(JSON.stringify(this.transactionResponse));

      this.router.navigate(['/edit-transaction-portal']);

    } else {
      this._transactionService.findExistingTransactionByTransactionNumber('U001', searchNumber)
                               .subscribe(data => this.transactionResponse = data);
             console.log(JSON.stringify(this.transactionResponse));
             this.router.navigate(['/edit-transaction-portal']);
      }
    }

I would like to either 1) send the response object obtained here or send the searchNumber entered by the user, so that I can perform a lookup within my edit form component. I need to pass either one from this component to the new component that I navigate to.

EDIT: The accepted solution demonstrates how to add query params to this.router.navigate() and how to retrieve it by subscribing to activateRoute, a different approach than the one identified in the other SO post.

javascript angular typescript

Answer 1

Answer №1

If you need to retrieve the number (bill/transaction)

this.router.navigate(['/edit-transaction-portal'], { queryParams: { bill: 'U001' } });
this.router.navigate(['/edit-transaction-portal'], { queryParams: { transaction: 'U001' } });

then within your

component(edit-transaction-portal)

, make an API call to fetch the required data. Make sure to have ActivatedRoute included in the constructor like so:

isBill: boolean;
isTransaction: boolean;
number: string;
constructor(private route: ActivatedRoute) {}
ngOnInit() {
    this.sub = this.route
      .queryParams
      .subscribe(params => {
        this.isBill = params['bill'] != undefined;
        this.isTransaction = params['transaction'] != undefined;
        this.number = this.isBill ? params['bill'] : params['transaction'];
        // Perform API request here
      });
}

Answer 2

If you need to retrieve the number (bill/transaction)

this.router.navigate(['/edit-transaction-portal'], { queryParams: { bill: 'U001' } });
this.router.navigate(['/edit-transaction-portal'], { queryParams: { transaction: 'U001' } });

then within your

component(edit-transaction-portal)

, make an API call to fetch the required data. Make sure to have ActivatedRoute included in the constructor like so:

isBill: boolean;
isTransaction: boolean;
number: string;
constructor(private route: ActivatedRoute) {}
ngOnInit() {
    this.sub = this.route
      .queryParams
      .subscribe(params => {
        this.isBill = params['bill'] != undefined;
        this.isTransaction = params['transaction'] != undefined;
        this.number = this.isBill ? params['bill'] : params['transaction'];
        // Perform API request here
      });
}

Answer 3

Answer №2

My question is how I can transfer the information, specifically the number entered by the user on the material dialog component, to another component.

You can transmit it through the material dialog component. Include dialogRef in your component that was opened in the dialog:

constructor(
   public dialogRef: MatDialogRef<SomeComponent>,   
   @Inject(MAT_DIALOG_DATA) public data: any,    
  ) { }

Upon submitting the data, you can pass any data to the component that opened this dialog by closing the dialog:

  onSubmit() {
    this.service.postProduct(this.contract, this.product)
      .subscribe(resp => {
        this.dialogRef.close(resp);
      });

  }

In your parent component, which initiated the opening of this dialog, you can retrieve this passed data by subscribing to the afterClosed() observable:

Parent.component.ts:

openDialog(id) {
    const dialogRef = this.dialog.open(SomeComponent, {

      data: { id: anyData}
    });
    dialogRef.afterClosed().subscribe(result => {
      if (result) {
         // do something...
      }
    });
  }

If I pass the data object in dialog.open(), how do I retrieve it from there?

Refer to the openDialog() function above. It includes a data property that can be sent to dialog components. In the opened component, inject MAT_DIALOG_DATA as follows:

@Inject(MAT_DIALOG_DATA) public data: any,

This will allow you to access the passed data object as demonstrated in the code snippet above.

Official docs[sharing-data-with-the-dialog-component]

Answer 4

My question is how I can transfer the information, specifically the number entered by the user on the material dialog component, to another component.

You can transmit it through the material dialog component. Include dialogRef in your component that was opened in the dialog:

constructor(
   public dialogRef: MatDialogRef<SomeComponent>,   
   @Inject(MAT_DIALOG_DATA) public data: any,    
  ) { }

Upon submitting the data, you can pass any data to the component that opened this dialog by closing the dialog:

  onSubmit() {
    this.service.postProduct(this.contract, this.product)
      .subscribe(resp => {
        this.dialogRef.close(resp);
      });

  }

In your parent component, which initiated the opening of this dialog, you can retrieve this passed data by subscribing to the afterClosed() observable:

Parent.component.ts:

openDialog(id) {
    const dialogRef = this.dialog.open(SomeComponent, {

      data: { id: anyData}
    });
    dialogRef.afterClosed().subscribe(result => {
      if (result) {
         // do something...
      }
    });
  }

If I pass the data object in dialog.open(), how do I retrieve it from there?

Refer to the openDialog() function above. It includes a data property that can be sent to dialog components. In the opened component, inject MAT_DIALOG_DATA as follows:

@Inject(MAT_DIALOG_DATA) public data: any,

This will allow you to access the passed data object as demonstrated in the code snippet above.

Official docs[sharing-data-with-the-dialog-component]

Answer 5

Answer №3

In order to transfer data via routing, you need to specify a route that includes the value as part of the route definition like shown below:

const appRoutes: Routes = [
  { path: 'hero/:id',      component: HeroDetailComponent },
];

This is how it will work on the code side:

gotoHeroes(hero: Hero) {
  let heroId = hero ? hero.id : null;
  // Pass along the hero id if available
  // so that the HeroList component can select that hero.
  // Include a junk 'foo' property for fun.
  this.router.navigate(['/heroes', { id: heroId, foo: 'foo' }]);
}

Reference: https://angular.io/guide/router#router-imports

When you need to pass data between two components, Angular provides the concepts of @Input and @Output properties which facilitate data transfer between components.

@Input() - Allows passing data from parent to child component.

@Output() - Enables passing data from child to parent component.

An alternative method is by utilizing a Service to share the same instance of the service among components.

Further reading: 3 ways to communicate between Angular components

Answer 6

In order to transfer data via routing, you need to specify a route that includes the value as part of the route definition like shown below:

const appRoutes: Routes = [
  { path: 'hero/:id',      component: HeroDetailComponent },
];

This is how it will work on the code side:

gotoHeroes(hero: Hero) {
  let heroId = hero ? hero.id : null;
  // Pass along the hero id if available
  // so that the HeroList component can select that hero.
  // Include a junk 'foo' property for fun.
  this.router.navigate(['/heroes', { id: heroId, foo: 'foo' }]);
}

Reference: https://angular.io/guide/router#router-imports

When you need to pass data between two components, Angular provides the concepts of @Input and @Output properties which facilitate data transfer between components.

@Input() - Allows passing data from parent to child component.

@Output() - Enables passing data from child to parent component.

An alternative method is by utilizing a Service to share the same instance of the service among components.

Further reading: 3 ways to communicate between Angular components

What is the best way to transfer information between two components when working with an edit form?

Answer №1

Answer №2

Answer №3

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