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Efficiently Set Cookies in Angular with ngx-cookie-service

Introduction to Cookies in Angular

When surfing the internet, it’s likely that you’ve come across pop-up messages asking if you would like to accept cookies. Cookies are tiny data files that store information about website visitors and their actions on a website.

These data files are usually stored on a user’s browser and are commonly used by web applications to maintain user sessions or remember user preferences. Cookies come in two types: session cookies and persistent cookies.

Session cookies last throughout a user’s browsing session and are deleted once the user exits the browser. Persistent cookies, on the other hand, remain on the user’s browser for a predetermined period, even after the user has left the website.

In this article, we’ll be discussing the use of cookies in websites, their benefits, and how to store cookies in Angular. What Are Cookies and Their Use in Websites?

As mentioned earlier, cookies are small data files that websites use to store information about their visitors. These files are usually sent from a website to a user’s browser whenever the user accesses a website.

One of the primary uses of cookies on websites is to maintain user sessions. When a user logs into a web application, a session cookie is created on their browser.

This cookie preserves the user’s login information and enables them to traverse through the website without having to re-enter their login credentials. Cookies are also used by web applications to remember user preferences and settings.

For instance, if a user selects a particular language option on a website, the web application can store that preference as a cookie and automatically display pages in that language during future visits.

Benefits of Using Cookies

Authentication

Authentication is a crucial aspect of web application security. Cookies are commonly used to authenticate users.

When a user logs into a website, a session cookie is created, as mentioned earlier. This cookie contains the user’s login credentials.

When the user navigates through different pages on the website, the session cookie is accessed to verify their identity and grant them access to restricted areas of the website.

Data Storage

Cookies are also used to store user data, such as user preferences and settings. This data is usually stored as a cookie on the user’s browser.

Cookies are also used by web applications to store data temporarily, such as a user’s shopping cart information.

Limitations of Storing Cookies

Although cookies are useful in web application development, there are specific limitations to their usage.

20 Cookies Per Web Server

Each website hosted on a web server can store up to 20 cookies. If you exceed this limit, the browser will discard the oldest cookies.

As a result, web applications must be designed to use cookies efficiently without exceeding the 20 cookie limit.

4KB Data Per Cookie

Cookies can store up to 4KB of data. Storing more data than this leads to increased page loading times.

Max-Age Attribute

The max-age attribute is used to set a time limit on how long cookies should be stored on a user’s browser. Once this time limit has elapsed, the browser deletes the cookie.

If a max-age attribute is set too high, the user’s browser could become cluttered with unusable cookies, leading to longer page loading times and a terrible user experience.

How to Set Up Cookies in Angular using ngx-cookie-service Library

Angular is a powerful web application development framework that provides developers with the necessary tools to build web applications that use cookies efficiently. To enable cookie storage in Angular, we can use the ngx-cookie-service library.

This library provides a simple interface for creating and managing cookies in Angular applications. We can install the ngx-cookie-service library by calling the following command in the terminal:

npm install ngx-cookie-service –save

After installing the library, we can import it into our Angular application by adding the following code to our Angular module:

import { CookieService } from ‘ngx-cookie-service’;

@NgModule({

imports: […],

declarations: […],

providers: [CookieService],

bootstrap: […]

})

export class AppModule { }

To set a cookie using the ngx-cookie-service library, we can use the following code:

import { CookieService } from ‘ngx-cookie-service’;

export class AppComponent {

constructor(private cookieService: CookieService) { }

setCookie() {

this.cookieService.set(‘cookieName’, ‘cookieValue’);

}

}

The set() function takes two arguments: the name of the cookie and its value. Once set, the cookie can be accessed throughout the application.

Conclusion

In this article, we have introduced cookies, discussed their use in web applications, their benefits, as well as their limitations and how to set up cookies in Angular using the ngx-cookie-service library. By utilizing cookies correctly, web applications can provide a more personalized experience for their users.

While designing web applications that use cookies, it’s vital to ensure that the application does not exceed the number of cookies or the amount of data stored per cookie. This way, we can ensure that users experience fast page loading times and minimal disruption when using the application.

Setting Cookies in Angular

Cookies play a vital role in web application development by providing a means of storing user data and preferences. In Angular, we can use the ngx-cookie-service library to set cookies efficiently.

In this article, we’ll discuss how to install the ngx-cookie-service library using npm, adding CookieService to the providers’ array, using CookieService in app.component.ts file, and a demonstration of setting cookies in Angular.

Installing ngx-cookie-service Library Using Npm

To use the ngx-cookie-service library in an Angular application, we must first install it using npm. npm is a package manager for JavaScript that allows us to install and share packages of code.

To install the ngx-cookie-service library using npm, we can run the following command in our terminal:

“`

npm install ngx-cookie-service –save

“`

This command installs the ngx-cookie-service library and saves it as a dependency in our application. Adding CookieService to Provider’s Array

After installing the ngx-cookie-service library, the next step is to add the CookieService to the providers’ array in our application module.

The providers’ array is where we specify the services that our application should use. In this case, we’ll specify that our application should use the CookieService provided by the ngx-cookie-service library.

Here’s an example of how we can add CookieService to our providers’ array:

“`

import { NgModule } from ‘@angular/core’;

import { BrowserModule } from ‘@angular/platform-browser’;

import { AppComponent } from ‘./app.component’;

import { CookieService } from ‘ngx-cookie-service’;

@NgModule({

imports: [BrowserModule],

declarations: [AppComponent],

providers: [CookieService],

bootstrap: [AppComponent]

})

export class AppModule { }

“`

Using CookieService in app.component.ts file

Now that we’ve installed and added CookieService to our providers’ array, we can use it in our application. In this example, we’ll use the CookieService in the app.component.ts file to set and retrieve a cookie’s value.

Here’s an example of how to use the CookieService in our app.component.ts file:

“`

import { Component } from ‘@angular/core’;

import { CookieService } from ‘ngx-cookie-service’;

@Component({

selector: ‘app-root’,

templateUrl: ‘./app.component.html’,

styleUrls: [‘./app.component.css’]

})

export class AppComponent {

title = ‘cookie-demo’;

constructor(private cookieService: CookieService) {}

setCookie() {

this.cookieService.set(‘cookieName’, ‘cookieValue’);

}

getCookie() {

const cookieValue = this.cookieService.get(‘cookieName’);

console.log(‘Cookie Value: ‘, cookieValue);

}

}

“`

In this example, we’ve imported the CookieService from the ngx-cookie-service library. We’ve also created two functions, `setCookie()` and `getCookie()`, for setting and retrieving a cookie’s value, respectively.

The `set()` method is used to set the cookie’s name and value, while the `get()` method is used to retrieve the cookie’s value. Demo of

Setting Cookies in Angular

Finally, we’ll demonstrate how to set cookies in Angular using the ngx-cookie-service library in this section.

Below is a step-by-step guide on how to create an Angular application that sets cookies:

1. Create a new Angular application using the Angular CLI by running the following command in the terminal:

“`

ng new cookie-demo

“`

2. Install the ngx-cookie-service library by running the following command in the terminal:

“`

npm install ngx-cookie-service –save

“`

3. Add CookieService to our application’s providers’ array by editing the app.module.ts file:

“`

import { NgModule } from ‘@angular/core’;

import { BrowserModule } from ‘@angular/platform-browser’;

import { AppComponent } from ‘./app.component’;

import { CookieService } from ‘ngx-cookie-service’;

@NgModule({

imports: [BrowserModule],

declarations: [AppComponent],

providers: [CookieService],

bootstrap: [AppComponent]

})

export class AppModule { }

“`

4.

In the app.component.ts file, add two functions for setting and retrieving a cookie:

“`

import { Component } from ‘@angular/core’;

import { CookieService } from ‘ngx-cookie-service’;

@Component({

selector: ‘app-root’,

templateUrl: ‘./app.component.html’,

styleUrls: [‘./app.component.css’]

})

export class AppComponent {

title = ‘cookie-demo’;

constructor(private cookieService: CookieService) {}

setCookie() {

this.cookieService.set(‘cookieName’, ‘cookieValue’);

}

getCookie() {

const cookieValue = this.cookieService.get(‘cookieName’);

console.log(‘Cookie Value: ‘, cookieValue);

}

}

“`

5. In the app.component.html file, add two buttons that call the `setCookie()` and `getCookie()` functions:

“`

Cookie Demo App

“`

6.

Run the Angular application by running the following command in the terminal:

“`

ng serve

“`

7. After running the application, navigate to http://localhost:4200/ in your browser.

Click the “Set Cookie” button and refresh the page. Finally, click the “Get Cookie” button to retrieve the cookie’s value.

In conclusion, setting cookies in Angular is a straightforward process with the ngx-cookie-service library. By installing and using CookieService in our application, we can set and retrieve cookies effortlessly.

In this article, we’ve discussed how to install the ngx-cookie-service library using npm, adding CookieService to the providers’ array, using CookieService in app.component.ts file, and a demonstration of setting cookies in Angular. In conclusion, setting cookies in an Angular application is an essential aspect of web application development.

Cookies enable web applications to store user data and preferences, enhancing the user experience. In this article, we’ve explored how to set cookies in Angular using the ngx-cookie-service library.

We’ve discussed the installation of ngx-cookie-service library using npm, adding CookieService to the providers’ array, and demonstrated how to set cookies in Angular. By understanding cookies and utilizing the ngx-cookie-service library, developers can build more efficient and user-friendly web applications.

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