Challenge 56 multi step reactive form and signals (#1030)

feat: challenge 55 form and signal

apps/signal/56-forms-and-signal/src/app/app.component.ts

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+import { Component } from '@angular/core';
+import { RouterOutlet } from '@angular/router';
+
+@Component({
+  standalone: true,
+  imports: [RouterOutlet],
+  selector: 'app-root',
+  template: `
+    <h1 class="text-3xl">Shop</h1>
+    <div class="w-[500px] ">
+      <router-outlet />
+    </div>
+  `,
+  host: {
+    class: 'w-full flex justify-center flex-col items-center p-4 gap-10',
+  },
+})
+export class AppComponent {}

apps/signal/56-forms-and-signal/src/app/app.config.ts

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+import { ApplicationConfig, provideZoneChangeDetection } from '@angular/core';
+import { provideRouter, withComponentInputBinding } from '@angular/router';
+import { routes } from './app.routes';
+
+export const appConfig: ApplicationConfig = {
+  providers: [
+    provideZoneChangeDetection({ eventCoalescing: true }),
+    provideRouter(routes, withComponentInputBinding()),
+  ],
+};

apps/signal/56-forms-and-signal/src/app/app.routes.ts

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+import { Routes } from '@angular/router';
+
+export const routes: Routes = [
+  {
+    path: '',
+    redirectTo: 'dashboard',
+    pathMatch: 'full',
+  },
+  {
+    path: 'dashboard',
+    loadComponent: () => import('./dashboard.component'),
+  },
+  {
+    path: 'order',
+    loadComponent: () => import('./order.component'),
+  },
+  {
+    path: 'checkout',
+    loadComponent: () => import('./checkout.component'),
+  },
+  {
+    path: 'payment',
+    loadComponent: () => import('./payment.component'),
+  },
+  {
+    path: '**',
+    redirectTo: 'dashboard',
+  },
+];

apps/signal/56-forms-and-signal/src/app/checkout.component.ts

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+import {
+  ChangeDetectionStrategy,
+  Component,
+  computed,
+  input,
+} from '@angular/core';
+import { RouterLink } from '@angular/router';
+import { products } from './products';
+
+@Component({
+  selector: 'app-dashboard',
+  standalone: true,
+  imports: [RouterLink],
+  template: `
+    <h2 class="mb-1 w-full bg-gray-400 p-2 text-white">Checkout</h2>
+    <button
+      routerLink="/order"
+      queryParamsHandling="merge"
+      class="mb-5 text-blue-400">
+      < back to order
+    </button>
+    <section class="mb-5 flex justify-between">
+      <div class="font-bold">Your order:</div>
+      <div>
+        {{ quantity() }} x {{ product()?.name }}: {{ product()?.price }}€
+      </div>
+    </section>
+
+    <div>Billing Information</div>
+    <div>...</div>
+    <div>...</div>
+    <div>...</div>
+    <div>...</div>
+    <div>...</div>
+
+    <button
+      routerLink="/payment"
+      [queryParams]="{ quantity: quantity() }"
+      queryParamsHandling="merge"
+      class="w-full rounded-full border bg-blue-500 p-2 text-white">
+      Pay
+    </button>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export default class DashboardComponent {
+  quantity = input(1);
+  productId = input('1');
+
+  product = computed(() =>
+    products.find((product) => product.id === this.productId()),
+  );
+  totalWithVAT = computed(
+    () => this.quantity() * (this.product()?.price ?? 0) * 1.21,
+  );
+}

apps/signal/56-forms-and-signal/src/app/dashboard.component.ts

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+import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { RouterLink } from '@angular/router';
+import { products } from './products';
+
+@Component({
+  selector: 'app-dashboard',
+  standalone: true,
+  imports: [RouterLink],
+  template: `
+    <h2 class="mb-5 w-full bg-gray-400 p-2 text-white">List of Products</h2>
+    <ul class="w-full *:border-b *:border-l *:border-r *:p-4">
+      @for (product of products; track product.id) {
+        <li [class.border-t]="$first">
+          <div class="flex w-full justify-between">
+            {{ product.name }} ({{ product.price }}€)
+            <button
+              class="w-20 rounded-full border bg-blue-500 p-2 text-white"
+              routerLink="/order"
+              [queryParams]="{ productId: product.id }">
+              Buy
+            </button>
+          </div>
+        </li>
+      }
+    </ul>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export default class DashboardComponent {
+  products = products;
+}

apps/signal/56-forms-and-signal/src/app/order.component.ts

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+import {
+  ChangeDetectionStrategy,
+  Component,
+  computed,
+  input,
+} from '@angular/core';
+import { toSignal } from '@angular/core/rxjs-interop';
+import { FormControl, FormGroup, ReactiveFormsModule } from '@angular/forms';
+import { RouterLink } from '@angular/router';
+import { products } from './products';
+
+@Component({
+  selector: 'app-order',
+  standalone: true,
+  imports: [RouterLink, ReactiveFormsModule],
+  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">
+        <label for="countries" class="mb-2 block text-nowrap text-gray-900">
+          Select a quantity
+        </label>
+        <select
+          formControlName="quantity"
+          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>
+          <option value="2">2</option>
+          <option value="3">3</option>
+          <option value="4">4</option>
+          <option value="5">5</option>
+        </select>
+      </form>
+      <div class="flex justify-between">
+        <div>SubTotal</div>
+        <div>{{ totalWihoutVat() }} €</div>
+      </div>
+      <div class="flex justify-between">
+        <div>VAT (21%)</div>
+        <div>{{ vat() }} €</div>
+      </div>
+      <div class="flex justify-between">
+        <div>Total</div>
+        <div>{{ total() }} €</div>
+      </div>
+      <button
+        routerLink="/checkout"
+        [queryParams]="{ quantity: quantity() }"
+        queryParamsHandling="merge"
+        class="w-full rounded-full border bg-blue-500 p-2 text-white">
+        Checkout
+      </button>
+    </section>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export default class OrderComponent {
+  form = new FormGroup({
+    quantity: new FormControl(1, { nonNullable: true }),
+  });
+
+  productId = input('1');
+  price = computed(
+    () => products.find((p) => p.id === this.productId())?.price ?? 0,
+  );
+  quantity = toSignal(this.form.controls.quantity.valueChanges, {
+    initialValue: this.form.getRawValue().quantity,
+  });
+  totalWihoutVat = computed(() => Number(this.price()) * this.quantity());
+  vat = computed(() => this.totalWihoutVat() * 0.21);
+  total = computed(() => this.totalWihoutVat() + this.vat());
+}

apps/signal/56-forms-and-signal/src/app/payment.component.ts

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+import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { RouterLink } from '@angular/router';
+
+@Component({
+  selector: 'app-dashboard',
+  standalone: true,
+  imports: [RouterLink],
+  template: `
+    <h2 class="mb-1 w-full bg-green-700 p-2 text-white">Payment Success</h2>
+
+    <button
+      routerLink="/dashboard"
+      class="w-full rounded-full border bg-blue-500 p-2 text-white">
+      Back to Shop
+    </button>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export default class DashboardComponent {}

apps/signal/56-forms-and-signal/src/app/products.ts

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+export const products = [
+  {
+    id: '1',
+    name: 'Computer',
+    price: 2000,
+  },
+  {
+    id: '2',
+    name: 'Mouse',
+    price: 40,
+  },
+  {
+    id: '3',
+    name: 'Keyboard',
+    price: 80,
+  },
+];

apps/signal/56-forms-and-signal/src/index.html

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+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title>signal-forms-and-signal</title>
+    <base href="/" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <link rel="icon" type="image/x-icon" href="favicon.ico" />
+  </head>
+  <body>
+    <app-root></app-root>
+  </body>
+</html>

apps/signal/56-forms-and-signal/src/main.ts

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+import { bootstrapApplication } from '@angular/platform-browser';
+import { AppComponent } from './app/app.component';
+import { appConfig } from './app/app.config';
+
+bootstrapApplication(AppComponent, appConfig).catch((err) =>
+  console.error(err),
+);

apps/signal/56-forms-and-signal/src/styles.scss

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+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+/* You can add global styles to this file, and also import other style files */