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Answer:56 forms and signal #1169

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Answer:56 forms and signal #1169

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e0605da
feat: answer 56 forms and signal
apalaio Jan 8, 2025
50cac63
Merge branch 'main' into 56-forms-and-signal
apalaio Jan 8, 2025
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16 changes: 14 additions & 2 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 @@ -2,6 +2,7 @@ import {
ChangeDetectionStrategy,
Component,
computed,
effect,
input,
} from '@angular/core';
import { toSignal } from '@angular/core/rxjs-interop';
Expand Down Expand Up @@ -59,13 +60,24 @@ export default class OrderComponent {
});

productId = input('1');
quantity = input(1);
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you could use this.route.snapshot.queryParams['quantity'] since this.route is created first the value is available when you want to instantiate the class,
The code is simpler. but your code works. Waiting for signal forms to make all of this easy 🔥

price = computed(
() => products.find((p) => p.id === this.productId())?.price ?? 0,
);
quantity = toSignal(this.form.controls.quantity.valueChanges, {

quantityValue = toSignal(this.form.controls.quantity.valueChanges, {
initialValue: this.form.getRawValue().quantity,
});
totalWithoutVat = computed(() => Number(this.price()) * this.quantity());

totalWithoutVat = computed(() => Number(this.price()) * this.quantityValue());
vat = computed(() => this.totalWithoutVat() * 0.21);
total = computed(() => this.totalWithoutVat() + this.vat());

constructor() {
effect(() => {
const quantityFromUrl = this.quantity();
this.form.controls.quantity.setValue(quantityFromUrl);
});
}

}