In this blog, we are going to create a very basic Angular 7 CRUD (Create, Read, Update and Delete) application with Node.JS REST API endpoints. With the help of our REST API, we will work on our MongoDB database, and perform various operations on Products collection.

In the previous post, I created the Node.JS API endpoints, and described everything related to Node.JS and MongoDB database. Please go through my previous post before reading this blog for better understanding.

Angular 7 Prerequisites

Before start writing the Angular 7 app, please make sure that, you have latest version of:

Node.JS and NPM installed on your system

Angular 7 CLI installed on your system

You can go through below links for more details about updating Angular 6 to Angular 7, and creating your first Angular 7 app.

MongoDB Backend Overview

Let me introduce you about the MongoDB Document structure. We have Products collection in our database, and this Products collection have multiple documents related to various products.

This is the screenshot of our MongoDB Products collection.

Products Collection

And this is the screenshot of each Product document.

Node.JS Rest API Endpoints

You can get all details of Node.JS Rest API in the above link, which I shared on the top of this post. Let me share again, which endpoints we have for our application. These are the list of our API endpoints.

Creating Angular 7 Project

Let’s start with our Angular 7 app. Using above Node.JS API endpoints, we are going to perform CRUD operation. This will be the screen of our Angular app.

Create your angular app using the ng new <app-name> command in your terminal.

1. Creating Model Class In Angular

After creating our app, let’s first create our Product Model class as per our database Product Document properties.

ProductModel.ts

2. Creating Service In Angular

Let’s create our Product Service class, which will interact with our Node.JS endpoints for all product related operations.

product.service.ts

We have imported HttpClient and ProductModel in our service class.

This is our service url endpoint.

baseurl: string = “http://localhost:3000/”;

In this class, we have different methods. These are:

getAllProducts() : This method is used to get all products. We are using HTTP GET method of HttpClient object with service endpoint.

getProductById(id: string) : This method is used to get a product by product id. We are using same HTTP GET method of HTTPClient object with service endpoint. Product ID is passed in service url.

addProduct(product: ProductModel) : This method is used to add product. We are using HTTP POST method of HTTPClient object with service endpoint. Product object will be send in request body.

deleteProduct(id: string) : This method is used to delete the product. We are using HTTP DELETE method of HTTPClient object with the service endpoint. We are just passing the Product ID in the service url.

updateProduct(product: ProductModel) : This method is used to update the product. We are using HTTP PUT method of HTTPClient object with the service endpoint. We are passing ProductID in service endpoint url, and new product in the request body.

Import Product Service in app.module

Now, after creating the product service, we have to import this in our app.module.ts file. Let’s do it now.

app.module.ts

Add this line on the top of app.module.ts file.

import { ProductService } from ‘./product.service’;

And this ProductService in Providers[] array.

providers: [ProductService]

3. Creating Component For Listing All Products

First of all, we are going to fetch all the products in our database. Create list-products component, and add this to our routing module. This component will fetch all the products from the database and display it in tabular form. Add routing details of this component in our route file.

app-routing.module.ts

Import ListProductsComponent in our routing file.

import { ListProductsComponent } from ‘./list-products/list-products.component’;

And, add this in routes constant.

{ path: ”, component: ListProductsComponent, pathMatch: ‘full’ }

This is our list-products component html file.

list-products.component.html

list-products.component.ts

To get the list of all products, we have created getAllProducts() function, and call it in ngOnInit() .

4. Creating Component For Adding Product

This component will be used to add a product in our database. Add routing details of this component in our route file.

app-routing.module.ts

Add this line on the top of app-routing.module.ts file.

import { AddProductComponent } from ‘./add-product/add-product.component’;

And, add this in routes constant.

{ path: ‘add-product’, component: AddProductComponent }

This is our add-product component file.

add-product.component.html

add-product.component.ts

In this component class, we have used Validators to check whether all required fields are filled or not. When user click on Add Product button on Product List page, user will be navigating to the Add Product page.

Add Product Page

In the above pic, if you try to save without filing all the fields, it will red highlight the textbook and let you not to save the product. So, fill all the fields and save the new product. As soon as your product is saved, you will be redirecting again to the all products page with newly product added.

Also, notice the following code in list-products.component.html file. We have (click) event on the Add Product button, and calling the addProduct() method of list-products.component.ts class. In this method, we are simply navigating to our route add-product , and opening the add-product component page.

5. Delete Product

In order to delete any product, we don’t need to create any component. For each product in grid on list-products.component.html component, we have Delete button attached to it. There is an deleteProduct(product) method on (click) event of this Delete button. deleteProduct(product) method is defined in list-products.component.ts file.

After deleting the product, we are fetching all the products again by calling this.getAllProducts() method.

6. Creating Component For Updating Product

In order to update any product, we are going to create another component. Create component edit-product in your app. Add creating your component, we have to define the route as well in your app. Open the app-routing.module.ts file and import this component there.

app-routing.module.ts

import { EditProductComponent } from ‘./edit-product/edit-product.component’;

Add the route in routes constant.

{ path: ‘edit-product’, component: EditProductComponent}

edit-product.component.html

Our edit-product component html file is similar to add-product component html file. So, you can simply copy paste the same html here.

edit-product.component.ts

Here, we are using localStorage.getItem() to get the productId , which was stored in our list-product.component.ts file using localStorage.setItem() . So, let’s first get the productId first from localStorage() in ngOnInit() method. See below code, how we are setting productId in localStorage() . After that, we are navigating to our edit component page.

list-product.component.ts

After retrieving the productId from localStorage , we are going to get the product using this productId in ngOnInit() function.

edit-product.component.ts

On successful, we are setting the form values with the response data using patchValue() method.

Edit Product

Update the values in the form and click on Update button. It will call the onSubmit() function of edit-product.component.ts class file. After updating the values in database, it will be redirected to product listing component page.

So, we have done with our CRUD operation on our product model. Let me show you complete app-routing and app.module files.

Angular 7 Routing: app-routing.module.ts

Angular 7 Module: app.module.ts

Install Bootstrap and FontAwesome in Angular 7

Use this npm command to install the Bootstrap and FontAwesome in your project.

npm install bootstrap font-awesome

Importing the Bootstrap and FontAwesome

After installation, you can add these css files in your styles.css file.

Angular 7 Project Structure

This will be our app structure.

Angular App Project Structure

Download

You can download all the project files from GitHub.

Angular Best Books

Summary

In this blog, we learned about how to perform CRUD operation on our MongoDB database using Node.Js Api. I also shared the project files on Github, from where you can view and download it.

Further Reading

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