Learn Angular.js by Building a Recipe App: A Free eBook
Recipes with Angular.js PDF Download
Are you looking for a way to create dynamic and interactive web applications that can be downloaded as PDF files? If so, you might want to check out Angular.js, a popular JavaScript framework that lets you extend HTML with new attributes and features. In this article, you will learn what Angular.js is, how to set up your development environment, how to create a simple recipe app with Angular.js, and how to download your app as a PDF file.
recipes with angular.js pdf download
Benefits of Angular.js for creating dynamic web applications
Angular.js is a framework that allows you to create single-page applications (SPAs) that run in the browser. SPAs are web applications that load a single HTML page and dynamically update it as the user interacts with it. This makes them faster, smoother, and more user-friendly than traditional web applications that reload the entire page every time something changes.
Some of the benefits of using Angular.js for creating SPAs are:
It uses a declarative syntax that makes your code more readable and maintainable.
It supports two-way data binding that automatically synchronizes the view and the model, eliminating the need for manual DOM manipulation.
It provides built-in directives and filters that add functionality and behavior to your HTML elements.
It allows you to create custom directives and filters that suit your specific needs.
It supports dependency injection that makes your code more modular and testable.
It integrates well with other libraries and tools such as Bootstrap, Firebase, Ionic, etc.
How to set up Angular.js environment and tools
To start developing with Angular.js, you will need some basic tools and resources. Here are the steps to set up your Angular.js environment:
Download and install Node.js from https://nodejs.org/en/. Node.js is a JavaScript runtime environment that allows you to run JavaScript code outside the browser. It also comes with npm, a package manager that lets you install and manage various modules and dependencies.
Open your terminal or command prompt and run npm install -g @angular/cli. This will install Angular CLI, a command-line interface tool that helps you create and manage Angular projects.
Create a new folder for your project and navigate to it in your terminal or command prompt. Run ng new recipe-app. This will create a new Angular project called recipe-app with some default files and configurations.
Navigate to the recipe-app folder in your terminal or command prompt. Run ng serve --open. This will start a local development server and open your app in your default browser. You should see a welcome message saying "recipe-app app is running!"
Open your favorite code editor (such as Visual Studio Code) and open the recipe-app folder. You will see several files and folders that make up your Angular project. The most important ones are:
src: This folder contains the source code of your app, such as HTML, CSS, and TypeScript files.
src/app: This folder contains the main components of your app, such as app.component.ts, app.component.html, app.component.css, app.module.ts, etc.
src/assets: This folder contains any static assets that your app needs, such as images, icons, fonts, etc.
src/environments: This folder contains the configuration files for different environments, such as development and production.
angular.json: This file contains the configuration options for your Angular project, such as scripts, styles, assets, etc.
package.json: This file contains the metadata and dependencies of your project, such as name, version, description, scripts, etc.
How to create a simple recipe app with Angular.js
Now that you have set up your Angular.js environment and tools, you are ready to create your simple recipe app. In this app, you will be able to browse through a list of recipes, view the details of each recipe, and add or remove recipes from your favorites. You will also be able to download your app as a PDF file.
Designing the app layout and components
The first step is to design the layout and components of your app. A component is a reusable piece of code that defines how a part of your app looks and behaves. For example, a header component can contain the logo and navigation of your app, a recipe-list component can display a list of recipes, etc.
To create a component in Angular.js, you need to define three things: a template, a class, and a selector. The template is the HTML code that defines how the component looks. The class is the TypeScript code that defines how the component behaves. The selector is the name that you use to refer to the component in other templates.
For this app, you will need four components: header, recipe-list, recipe-detail, and favorite-list. Here are the steps to create them:
In your terminal or command prompt, navigate to the recipe-app folder and run ng generate component header. This will create a new folder called header inside the src/app folder with four files: header.component.ts, header.component.html, header.component.css, and header.component.spec.ts. The last file is for testing purposes and can be ignored for now.
Open the header.component.html file and replace its content with the following code:
<div > <div > <h1>Recipe App</h1> <nav> <ul> <li><a routerLink="/">Home</a></li> <li><a routerLink="/favorites">Favorites</a></li> </ul> </nav> </div> </div>
This code defines the template of the header component. It contains a div with the class "header" that wraps a div with the class "container". Inside the container div, there is an h1 element with the text "Recipe App" and a nav element with two links: Home and Favorites. The routerLink attribute is used to navigate between different routes in your app. We will define these routes later.
Open the header.component.css file and add some styles to make the header look nicer:
.header background-color: #f0f0f0; padding: 20px 0; .container max-width: 960px; margin: 0 auto; h1 font-family: 'Roboto', sans-serif; font-size: 36px; color: #333333; nav float: right; ul list-style: none; margin: 0; padding: 0; li display: inline-block; margin-left: 20px; a font-family: 'Roboto', sans-serif; font-size: 18px; color: #333333; text-decoration: none; a:hover color: #ff0000;
sets the background color, padding, font family, font size, and color of the header elements. It also uses the float and display properties to align the nav element to the right and the list items to the horizontal direction. It also adds some hover effects to the links.
Open the header.component.ts file and look at its content:
import Component, OnInit from '@angular/core'; @Component( selector: 'app-header', templateUrl: './header.component.html', styleUrls: ['./header.component.css'] ) export class HeaderComponent implements OnInit constructor() ngOnInit(): void
This code defines the class and the selector of the header component. The @Component decorator is used to provide metadata for the component, such as the selector name, the template URL, and the style URL. The export keyword is used to make the class available for other modules to import. The implements OnInit keyword is used to indicate that the class implements the OnInit interface, which is a lifecycle hook that runs when the component is initialized. The constructor and ngOnInit methods are empty for now, but you can use them to add some logic to your component later.
Repeat steps 1 to 4 for the other three components: recipe-list, recipe-detail, and favorite-list. You can use the following code snippets for their templates and styles:
recipe-list.component.html: <div > <div > <h2>Recipes</h2> <div > <div *ngFor="let recipe of recipes"> <div > <img src=" recipe.image" alt=" recipe.title" > <div > <h5 > recipe.title</h5> <p > recipe.description</p> <a routerLink="/recipe/ recipe.id" >View Details</a> </div> </div> </div> </div> </div> </div>
recipe-list.component.css: .recipe-list margin-top: 20px; .row display: flex; flex-wrap: wrap; .col-4 width: 33.33%; padding: 10px; .card box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2); .card-img-top width: 100%; height: 200px; object-fit: cover; .card-title font-family: 'Roboto', sans-serif; font-size: 24px; color: #333333; .card-text font-family: 'Roboto', sans-serif; font-size: 16px; color: #333333; .btn font-family: 'Roboto', sans-serif; font-size: 16px;
recipe-detail.component.html: <div > <div > <h2> recipe.title</h2> <div > <div > <img src=" recipe.image" alt=" recipe.title" > </div> <div > <p><b>Description:</b><br> recipe.description</p> <p><b>Ingredients:</b><br><ul><li *ngFor="let ingredient of recipe.ingredients"> ingredient</li></ul></p> <p><b>Instructions:</b><br><ol><li *ngFor="let step of recipe.instructions"> step</li></ol></p> <button (click)="toggleFavorite()"> isFavorite ? 'Remove from Favorites' : 'Add to Favorites'</button> </div> </div> </div> </div>
recipe-detail.component.css: .recipe-detail margin-top: 20px; .img-fluid width: 100%; height: auto; p font-family: 'Roboto', sans-serif; font-size: 16px; color: #333333; b font-weight: bold; ul, ol list-style: none; margin: 0; padding: 0; li margin-bottom: 10px; .btn font-family: 'Roboto', sans-serif; font-size: 16px;
favorite-list.component.html: <div > <div > <h2>Favorites</h2> <div > <div *ngFor="let recipe of favorites"> <div > <img src=" recipe.image" alt=" recipe.title" > <div > <h5 > recipe.title</h5> <p > recipe.description</p> <a routerLink="/recipe/ recipe.id" >View Details</a> </div> </div> </div> </div> </div> </div>
favorite-list.component.css: .favorite-list margin-top: 20px; .row display: flex; flex-wrap: wrap; .col-4 width: 33.33%; padding: 10px; .card box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2); .card-img-top width: 100%; height: 200px; object-fit: cover; .card-title font-family: 'Roboto', sans-serif; font-size: 24px; color: #333333; .card-text font-family: 'Roboto', sans-serif; font-size: 16px; color: #333333; font-family: 'Roboto', sans-serif; font-size: 16px; }
These code snippets define the templates and styles of the recipe-list, recipe-detail, and favorite-list components. They use some Angular features such as *ngFor to loop through arrays of data, routerLink to navigate between routes, and (click) to handle click events. We will explain these features in more detail later.
Fetching and displaying data from an API
The next step is to fetch and display data from an API. An API is a service that provides data or functionality to other applications. For this app, you will use a mock API that returns some dummy data about recipes. You can find the mock API at https://my-json-server.typicode.com/typicode/demo/posts. If you visit this URL in your browser, you will see an array of objects that represent recipes. Each object has an id, a title, an image, a description, an array of ingredients, and an array of instructions.
To fetch and display data from an API in Angular.js, you need to use two things: a service and a component. A service is a class that provides some functionality or data to other parts of your app. A component is a class that defines how a part of your app looks and behaves. You can use a service to fetch data from an API and then pass it to a component to display it in the template.
For this app, you will need one service: recipe.service.ts. Here are the steps to create it:
In your terminal or command prompt, navigate to the recipe-app folder and run ng generate service recipe. This will create a new file called recipe.service.ts inside the src/app folder.
Open the recipe.service.ts file and look at its content:
import Injectable from '@angular/core'; @Injectable( providedIn: 'root' ) export class RecipeService constructor()
This code defines the class and the decorator of the recipe service. The @Injectable decorator is used to provide metadata for the service, such as where it should be provided. The providedIn: 'root' option means that the service will be available for the entire app. The constructor method is empty for now, but you can use it to inject other services or dependencies later.
Import HttpClient from @angular/common/http at the top of the file:
import Injectable from '@angular/core'; import HttpClient from '@angular/common/http';
HttpClient is a service that allows you to make HTTP requests and handle responses from APIs.
Inject HttpClient into the constructor of the recipe service:
constructor(private http: HttpClient)
This code uses the private keyword to create a property called http that holds an instance of HttpClient. You can use this property to call methods on HttpClient later.
Create a method called getRecipes() that returns an observable of recipes:
getRecipes() return this.http.get('https://my-json-server.typicode.com/typicode/demo/posts');
This code uses the get method on HttpClient to make a GET request to the mock API URL and return an observable of the response. An observable is an object that emits data over time. You can subscribe to an observable to get the data and handle errors or completion events.
Now that you have created the recipe service, you need to use it in your components. Here are the steps to do so:
Open the app.module.ts file and import HttpClientModule from @angular/common/http at the top of the file:
import HttpClientModule from '@angular/common/http';
HttpClientModule is a module that provides HttpClient and other related services.
Add HttpClientModule to the imports array in the @NgModule decorator:
@NgModule( declarations: [ AppComponent, HeaderComponent, RecipeListComponent, RecipeDetailComponent, FavoriteListComponent ], imports: [ BrowserModule, AppRoutingModule, HttpClientModule ], providers: [], bootstrap: [AppComponent] )
This code registers HttpClientModule as an import for your app module. This means that you can use HttpClient and other related services in any component or service that belongs to this module.
Open the recipe-list.component.ts file and import RecipeService from ./recipe.service at the top of the file:
import RecipeService from './recipe.service';
This code imports the recipe service that you created earlier.
Inject RecipeService into the constructor of the recipe-list component:
constructor(private recipeService: RecipeService)
This code uses the private keyword to create a property called recipeService that holds an instance of RecipeService. You can use this property to call methods on RecipeService later.
Create a property called recipes that holds an array of any type:
recipes: any[] = [];
This code creates a property called recipes that holds an empty array of any type. You will use this property to store the data that you get from the recipe service.
Implement the ngOnInit method to call the getRecipes method on the recipe service and subscribe to the observable that it returns:
ngOnInit(): void this.recipeService.getRecipes().subscribe(data => this.recipes = data; );
This code uses the ngOnInit method, which is a lifecycle hook that runs when the component is initialized. It calls the getRecipes method on the recipe service and subscribes to the observable that it returns. The subscribe method takes a function as an argument that receives the data emitted by the observable. The function assigns the data to the recipes property.
Open the recipe-list.component.html file and replace its content with the following code:
<div > <div > <h2>Recipes</h2> <div > <div *ngFor="let recipe of recipes"> <div > <img src=" recipe.image" alt=" recipe.title" > <div > <h5 > recipe.title</h5> <p > recipe.description</p> <a routerLink="/recipe/ recipe.id" >View Details</a> </div> </div> </div> </div> </div> </div>
This code defines the template of the recipe-list component. It uses the *ngFor directive to loop through the recipes array and display each recipe as a card. It uses interpolation to bind the data from each recipe object to the HTML elements, such as img, h5, p, and a. It also uses routerLink to navigate to the recipe-detail component with the id of each recipe as a parameter.
Repeat steps 3 to 7 for the recipe-detail component and the favorite-list component. You can use the following code snippets for their classes and templates:
recipe-detail.component.ts: import Component, OnInit from '@angular/core'; import ActivatedRoute from '@angular/router'; import RecipeService from './recipe.service'; @Component( selector: 'app-recipe-detail', templateUrl: './recipe-detail.component.html', styleUrls: ['./recipe-detail.component.css'] ) export class RecipeDetailComponent implements OnInit recipe: any = ; isFavorite: boolean = false; constructor(private route: ActivatedRoute, private recipeService: RecipeService) ngOnInit(): void this.route.paramMap.subscribe(params => let id = params.get('id'); this.recipeService.getRecipes().subscribe(data => this.recipe = data.find(recipe => recipe.id == id); this.isFavorite = this.recipeService.isFavorite(this.recipe); ); ); toggleFavorite() this.isFavorite = !this.isFavorite; this.recipeService.toggleFavorite(this.recipe);
favorite-list.component.ts: import Component, OnInit from '@angular/core'; import RecipeService from './recipe.service'; @Component( selector: 'app-favorite-list', templateUrl: './favorite-list.component.html',