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

feat: challenge 55 form and signal

apps/signal/56-forms-and-signal/.eslintrc.json

@@ -0,0 +1,36 @@
+{
+  "extends": ["../../../.eslintrc.json"],
+  "ignorePatterns": ["!**/*"],
+  "overrides": [
+    {
+      "files": ["*.ts"],
+      "extends": [
+        "plugin:@nx/angular",
+        "plugin:@angular-eslint/template/process-inline-templates"
+      ],
+      "rules": {
+        "@angular-eslint/directive-selector": [
+          "error",
+          {
+            "type": "attribute",
+            "prefix": "app",
+            "style": "camelCase"
+          }
+        ],
+        "@angular-eslint/component-selector": [
+          "error",
+          {
+            "type": "element",
+            "prefix": "app",
+            "style": "kebab-case"
+          }
+        ]
+      }
+    },
+    {
+      "files": ["*.html"],
+      "extends": ["plugin:@nx/angular-template"],
+      "rules": {}
+    }
+  ]
+}

apps/signal/56-forms-and-signal/README.md

@@ -0,0 +1,13 @@
+# forms and signal
+
+> author: thomas-laforge
+
+### Run Application
+
+```bash
+npx nx serve signal-forms-and-signal
+```
+
+### Documentation and Instruction
+
+Challenge documentation is [here](https://angular-challenges.vercel.app/challenges/signal/56-forms-and-signal/).

apps/signal/56-forms-and-signal/project.json

@@ -0,0 +1,74 @@
+{
+  "name": "signal-forms-and-signal",
+  "$schema": "../../../node_modules/nx/schemas/project-schema.json",
+  "projectType": "application",
+  "prefix": "app",
+  "sourceRoot": "apps/signal/56-forms-and-signal/src",
+  "tags": [],
+  "targets": {
+    "build": {
+      "executor": "@angular-devkit/build-angular:application",
+      "outputs": ["{options.outputPath}"],
+      "options": {
+        "outputPath": "dist/apps/signal/56-forms-and-signal",
+        "index": "apps/signal/56-forms-and-signal/src/index.html",
+        "browser": "apps/signal/56-forms-and-signal/src/main.ts",
+        "polyfills": ["zone.js"],
+        "tsConfig": "apps/signal/56-forms-and-signal/tsconfig.app.json",
+        "inlineStyleLanguage": "scss",
+        "assets": [
+          {
+            "glob": "**/*",
+            "input": "apps/signal/56-forms-and-signal/public"
+          }
+        ],
+        "styles": ["apps/signal/56-forms-and-signal/src/styles.scss"],
+        "scripts": []
+      },
+      "configurations": {
+        "production": {
+          "budgets": [
+            {
+              "type": "initial",
+              "maximumWarning": "500kb",
+              "maximumError": "1mb"
+            },
+            {
+              "type": "anyComponentStyle",
+              "maximumWarning": "2kb",
+              "maximumError": "4kb"
+            }
+          ],
+          "outputHashing": "all"
+        },
+        "development": {
+          "optimization": false,
+          "extractLicenses": false,
+          "sourceMap": true
+        }
+      },
+      "defaultConfiguration": "production"
+    },
+    "serve": {
+      "executor": "@angular-devkit/build-angular:dev-server",
+      "configurations": {
+        "production": {
+          "buildTarget": "signal-forms-and-signal:build:production"
+        },
+        "development": {
+          "buildTarget": "signal-forms-and-signal:build:development"
+        }
+      },
+      "defaultConfiguration": "development"
+    },
+    "extract-i18n": {
+      "executor": "@angular-devkit/build-angular:extract-i18n",
+      "options": {
+        "buildTarget": "signal-forms-and-signal:build"
+      }
+    },
+    "lint": {
+      "executor": "@nx/eslint:lint"
+    }
+  }
+}

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

@@ -0,0 +1,18 @@
+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

@@ -0,0 +1,10 @@
+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

@@ -0,0 +1,29 @@
+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

@@ -0,0 +1,56 @@
+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

@@ -0,0 +1,31 @@
+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

@@ -0,0 +1,72 @@
+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

@@ -0,0 +1,19 @@
+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

@@ -0,0 +1,17 @@
+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

@@ -0,0 +1,13 @@
+<!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

@@ -0,0 +1,7 @@
+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

@@ -0,0 +1,5 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+/* You can add global styles to this file, and also import other style files */

apps/signal/56-forms-and-signal/tailwind.config.js

@@ -0,0 +1,14 @@
+const { createGlobPatternsForDependencies } = require('@nx/angular/tailwind');
+const { join } = require('path');
+
+/** @type {import('tailwindcss').Config} */
+module.exports = {
+  content: [
+    join(__dirname, 'src/**/!(*.stories|*.spec).{ts,html}'),
+    ...createGlobPatternsForDependencies(__dirname),
+  ],
+  theme: {
+    extend: {},
+  },
+  plugins: [],
+};

apps/signal/56-forms-and-signal/tsconfig.app.json

@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../../../dist/out-tsc",
+    "types": []
+  },
+  "files": ["src/main.ts"],
+  "include": ["src/**/*.d.ts"],
+  "exclude": ["jest.config.ts", "src/**/*.test.ts", "src/**/*.spec.ts"]
+}

apps/signal/56-forms-and-signal/tsconfig.editor.json

@@ -0,0 +1,6 @@
+{
+  "extends": "./tsconfig.json",
+  "include": ["src/**/*.ts"],
+  "compilerOptions": {},
+  "exclude": ["jest.config.ts", "src/**/*.test.ts", "src/**/*.spec.ts"]
+}

apps/signal/56-forms-and-signal/tsconfig.json

@@ -0,0 +1,30 @@
+{
+  "compilerOptions": {
+    "target": "es2022",
+    "useDefineForClassFields": false,
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "noImplicitOverride": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "files": [],
+  "include": [],
+  "references": [
+    {
+      "path": "./tsconfig.editor.json"
+    },
+    {
+      "path": "./tsconfig.app.json"
+    }
+  ],
+  "extends": "../../../tsconfig.base.json",
+  "angularCompilerOptions": {
+    "enableI18nLegacyMessageIdFormat": false,
+    "strictInjectionParameters": true,
+    "strictInputAccessModifiers": true,
+    "strictTemplates": true
+  }
+}

challenge-number.json

@@ -1,6 +1,6 @@
 {
-  "total": 55,
+  "total": 56,
   "🟢": 21,
   "🟠": 123,
-  "🔴": 210
+  "🔴": 211
 }

docs/src/content/docs/challenges/signal/56-forms-and-signal.md

@@ -0,0 +1,28 @@
+---
+title: 🔴 forms and signal
+description: Challenge 56 is about working with reactive forms and signals
+author: thomas-laforge
+contributors:
+  - tomalaforge
+challengeNumber: 56
+command: signal-forms-and-signal
+sidebar:
+  order: 211
+  badge: New
+---
+
+## Information
+
+We are working within a large e-commerce codebase that utilizes a substantial number of forms. The team predominantly uses reactive forms, and since the release of signals, we have been integrating them extensively.
+
+The current feature in development is a multi-step form process. The steps include: selecting a product, choosing the quantity, and finally proceeding to the checkout step to complete the billing details. However, an issue has been identified: when a user navigates back from the checkout step to the quantity step, the previously selected quantity is not retained. This needs to be fixed.
+
+## Challenge Statement
+
+The objective of this challenge is to make sure that the selected quantity is preserved when navigating back from the checkout step to the quantity step.
+
+## Constraints
+
+The solution must use reactive forms and signals.
+
+Additionally, as an optional side challenge, you may refactor the code to use template-driven forms.

docs/src/content/docs/es/index.mdx

@@ -13,7 +13,7 @@ hero:
       icon: right-arrow
       variant: primary
     - text: Ir al Desafío más reciente
-      link: /es/challenges/angular/55-back-button-navigation/
+      link: /es/challenges/signal/56-forms-and-signal/
       icon: rocket
     - text: Dar una estrella
       link: https://github.com/tomalaforge/angular-challenges
@@ -26,8 +26,8 @@ import MyIcon from '../../../components/MyIcon.astro';
 import SubscriptionForm from '../../../components/SubscriptionForm.astro';
 
 <CardGrid>
-<Card title="55 Desafíos">
-  Este repositorio contiene 55 Desafíos relacionados con <b>Angular</b>, <b>Nx</b>, <b>RxJS</b>, <b>Ngrx</b> y <b>Typescript</b>.
+<Card title="56 Desafíos">
+  Este repositorio contiene 56 Desafíos relacionados con <b>Angular</b>, <b>Nx</b>, <b>RxJS</b>, <b>Ngrx</b> y <b>Typescript</b>.
   Estos desafíos se resuelven en torno a problemas de la vida real o características específicas para mejorar tus habilidades.
 </Card>
 

docs/src/content/docs/fr/index.mdx

@@ -13,7 +13,7 @@ hero:
       icon: right-arrow
       variant: primary
     - text: Aller au dernier Challenge
-      link: /fr/challenges/angular/55-back-button-navigation/
+      link: /fr/challenges/signal/56-forms-and-signal/
       icon: rocket
     - text: Donne une étoile
       link: https://github.com/tomalaforge/angular-challenges
@@ -26,8 +26,8 @@ import MyIcon from '../../../components/MyIcon.astro';
 import SubscriptionForm from '../../../components/SubscriptionForm.astro';
 
 <CardGrid>
-<Card title="55 Défis">
-    Ce répertoire rassemble 55 Défis liés à <b>Angular</b>, <b>Nx</b>, <b>RxJS</b>, <b>Ngrx</b> et <b>Typescript</b>. Ces défis portent sur des problèmes réels ou des fonctionnalités spécifiques pour améliorer vos compétences.
+<Card title="56 Défis">
+    Ce répertoire rassemble 56 Défis liés à <b>Angular</b>, <b>Nx</b>, <b>RxJS</b>, <b>Ngrx</b> et <b>Typescript</b>. Ces défis portent sur des problèmes réels ou des fonctionnalités spécifiques pour améliorer vos compétences.
 </Card>
 
 <Card title="Subscribe to get notify of latest challenges">

docs/src/content/docs/index.mdx

@@ -13,7 +13,7 @@ hero:
       icon: right-arrow
       variant: primary
     - text: Go to the latest Challenge
-      link: /challenges/angular/55-back-button-navigation/
+      link: /challenges/signal/56-forms-and-signal/
       icon: rocket
     - text: Give a star
       link: https://github.com/tomalaforge/angular-challenges
@@ -27,8 +27,8 @@ import MyIcon from '../../components/MyIcon.astro';
 import SubscriptionForm from '../../components/SubscriptionForm.astro';
 
 <CardGrid>
-<Card title="53 Challenges">
-    This repository gathers 53 Challenges related to <b>Angular</b>, <b>Nx</b>, <b>RxJS</b>, <b>Ngrx</b> and <b>Typescript</b>.
+<Card title="56 Challenges">
+    This repository gathers 56 Challenges related to <b>Angular</b>, <b>Nx</b>, <b>RxJS</b>, <b>Ngrx</b> and <b>Typescript</b>.
     These challenges resolve around real-life issues or specific features to elevate your skills.
 </Card>
 

docs/src/content/docs/pt/index.mdx

@@ -13,7 +13,7 @@ hero:
       icon: right-arrow
       variant: primary
     - text: Ir para o desafio mais recente
-      link: /pt/challenges/angular/55-back-button-navigation/
+      link: /pt/challenges/signal/56-forms-and-signal/
       icon: rocket
     - text: Dar uma estrela
       link: https://github.com/tomalaforge/angular-challenges
@@ -26,8 +26,8 @@ import MyIcon from '../../../components/MyIcon.astro';
 import SubscriptionForm from '../../../components/SubscriptionForm.astro';
 
 <CardGrid>
-  <Card title="55 Desafios">
-    Este repositório possui 55 Desafios relacionados a <b>Angular</b>, <b>Nx</b>, <b>RxJS</b>,
+  <Card title="56 Desafios">
+    Este repositório possui 56 Desafios relacionados a <b>Angular</b>, <b>Nx</b>, <b>RxJS</b>,
     <b>Ngrx</b> e <b>Typescript</b>.
     Esses desafios são voltados para problemas reais ou funcionalidades específicas afim de
     melhorar suas habilidades.

docs/src/content/docs/ru/index.mdx

@@ -13,7 +13,7 @@ hero:
       icon: right-arrow
       variant: primary
     - text: Перейти к последней задаче
-      link: /ru/challenges/angular/55-back-button-navigation/
+      link: /ru/challenges/signal/56-forms-and-signal/
       icon: rocket
     - text: Добавить звезду
       link: https://github.com/tomalaforge/angular-challenges
@@ -26,8 +26,8 @@ import MyIcon from '../../../components/MyIcon.astro';
 import SubscriptionForm from '../../../components/SubscriptionForm.astro';
 
 <CardGrid>
-<Card title="54 испытаний">
-  Этот репозиторий содержит 54 испытаний, связанных с <b>Angular</b>, <b>Nx</b>, <b>RxJS</b>, <b>Ngrx</b> и <b>Typescript</b>.
+<Card title="56 испытаний">
+  Этот репозиторий содержит 56 испытаний, связанных с <b>Angular</b>, <b>Nx</b>, <b>RxJS</b>, <b>Ngrx</b> и <b>Typescript</b>.
   Испытания основаны на реальных задачах или инструментах для того, чтобы прокачать вас.
 </Card>