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Answer:56 #1287

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Answer:56 #1287

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17 changes: 14 additions & 3 deletions apps/signal/56-forms-and-signal/src/app/order.component.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@ import {
Component,
computed,
input,
Input,
} from '@angular/core';
import { toSignal } from '@angular/core/rxjs-interop';
import { FormControl, FormGroup, ReactiveFormsModule } from '@angular/forms';
Expand Down Expand Up @@ -44,7 +45,7 @@ import { products } from './products';
</div>
<button
routerLink="/checkout"
[queryParams]="{ quantity: quantity() }"
[queryParams]="{ quantity: quantityInternal() }"
queryParamsHandling="merge"
class="w-full rounded-full border bg-blue-500 p-2 text-white">
Checkout
Expand All @@ -58,14 +59,24 @@ export default class OrderComponent {
quantity: new FormControl(1, { nonNullable: true }),
});

@Input() set quantity(value: number) {
if (!value) {
return;
}

this.form.controls.quantity.patchValue(value);
}

productId = input('1');
price = computed(
() => products.find((p) => p.id === this.productId())?.price ?? 0,
);
quantity = toSignal(this.form.controls.quantity.valueChanges, {
quantityInternal = toSignal(this.form.controls.quantity.valueChanges, {
initialValue: this.form.getRawValue().quantity,
});
totalWithoutVat = computed(() => Number(this.price()) * this.quantity());
totalWithoutVat = computed(
() => Number(this.price()) * this.quantityInternal(),
);
vat = computed(() => this.totalWithoutVat() * 0.21);
total = computed(() => this.totalWithoutVat() + this.vat());
}