Skip to content

Answer:56 #1459

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
phhien203 wants to merge 1 commit into
base: main
Choose a base branch
from
Open

Answer:56 #1459

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
30 changes: 15 additions & 15 deletions apps/signal/56-forms-and-signal/src/app/order.component.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3,24 +3,24 @@ import {
Component,
computed,
input,
linkedSignal,
} from '@angular/core';
import { toSignal } from '@angular/core/rxjs-interop';
import { FormControl, FormGroup, ReactiveFormsModule } from '@angular/forms';
import { FormsModule } from '@angular/forms';
import { RouterLink } from '@angular/router';
import { products } from './products';

@Component({
selector: 'app-order',
imports: [RouterLink, ReactiveFormsModule],
imports: [RouterLink, FormsModule],
template: `
<h2 class="mb-5 w-full bg-gray-400 p-2 text-white">Order</h2>
<section class="flex flex-col gap-5">
<form class="flex items-center justify-between gap-5" [formGroup]="form">
<div class="flex items-center justify-between gap-5">
<label for="countries" class="mb-2 block text-nowrap text-gray-900">
Select a quantity
</label>
<select
formControlName="quantity"
[(ngModel)]="selectedQuantity"
id="countries"
class="block w-32 rounded-lg border border-gray-300 bg-gray-50 p-2.5 text-sm text-gray-900 focus:border-blue-500 focus:ring-blue-500">
<option value="1">1</option>
Expand All @@ -29,7 +29,7 @@ import { products } from './products';
<option value="4">4</option>
<option value="5">5</option>
</select>
</form>
</div>
<div class="flex justify-between">
<div>SubTotal</div>
<div>{{ totalWithoutVat() }} €</div>
Expand All @@ -44,7 +44,7 @@ import { products } from './products';
</div>
<button
routerLink="/checkout"
[queryParams]="{ quantity: quantity() }"
[queryParams]="{ quantity: selectedQuantity() }"
queryParamsHandling="merge"
class="w-full rounded-full border bg-blue-500 p-2 text-white">
Checkout
Expand All @@ -54,18 +54,18 @@ import { products } from './products';
changeDetection: ChangeDetectionStrategy.OnPush,
})
export default class OrderComponent {
form = new FormGroup({
quantity: new FormControl(1, { nonNullable: true }),
});

quantity = input('1');
productId = input('1');

selectedQuantity = linkedSignal(() => {
return this.quantity() ?? 1;
});
Copy link
Owner

@tomalaforge tomalaforge Mar 22, 2026

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I didn't know and never tried using linkedSignal in double binding. Smart solution

Copy link
Author

@phhien203 phhien203 Mar 23, 2026

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Thanks for your compliment ;)

price = computed(
() => products.find((p) => p.id === this.productId())?.price ?? 0,
);
quantity = toSignal(this.form.controls.quantity.valueChanges, {
initialValue: this.form.getRawValue().quantity,
});
totalWithoutVat = computed(() => Number(this.price()) * this.quantity());
totalWithoutVat = computed(
() => Number(this.price()) * Number(this.selectedQuantity()),
);
vat = computed(() => this.totalWithoutVat() * 0.21);
total = computed(() => this.totalWithoutVat() + this.vat());
}
Loading