An Overview of Angular Route Parameters

Routing is one of the fundamental mechanisms in Angular. Its primary use is to provide a way to navigate through an application. Without it, we would be stuck on the same page forever!

Apart from navigating, routing can also be used to pass small pieces of information between routed components. This can be achieved with the use of Angular route parameters.

There are three types of route parameters:

required parameters,
optional parameters, and
query parameters.

In this article, we present how basic routing works. Then we study all three types of route parameters provided by Angular.

So, let’s get started!

See more at : https://javascript.plainenglish.io/angular-route-parameters-a-simple-guide-88c69d54102c

#angular #route

Install Angular - Angular Environment Setup Process

Angular is a TypeScript based framework that works in synchronization with HTML, CSS, and JavaScript. To work with angular, domain knowledge of these 3 is required.

Installing Node.js and npm
Installing Angular CLI
Creating workspace
Deploying your First App

In this article, you will get to know about the Angular Environment setup process. After reading this article, you will be able to install, setup, create, and launch your own application in Angular. So let’s start!!!

Install Angular in Easy Steps

For Installing Angular on your Machine, there are 2 prerequisites:

Node.js
npm Package Manager

Node.js

First you need to have Node.js installed as Angular require current, active LTS or maintenance LTS version of Node.js

Download and Install Node.js version suitable for your machine’s operating system.

Npm Package Manager

Angular, Angular CLI and Angular applications are dependent on npm packages. By installing Node.js, you have automatically installed the npm Package manager which will be the base for installing angular in your system. To check the presence of npm client and Angular version check of npm client, run this command:

npm -v

Installing Angular CLI

Open Terminal/Command Prompt
To install Angular CLI, run the below command:

npm install -g @angular/cli

· After executing the command, Angular CLI will get installed within some time. You can check it using the following command

ng --version

Workspace Creation

Now as your Angular CLI is installed, you need to create a workspace to work upon your application. Methods for it are:

Using CLI
Using Visual Studio Code

1. Using CLI

To create a workspace:

Navigate to the desired directory where you want to create your workspace using cd command in the Terminal/Command prompt
Then in the directory write this command on your terminal and provide the name of the app which you want to create. In my case I have mentioned DataFlair:

Ng new YourAppName

After running this command, it will prompt you to select from various options about the CSS and other functionalities.

To leave everything to default, simply press the Enter or the Return key.

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Marcelle Smith

1594451700

Angular Route Guard: Implement Route Guard in Angular 10

Angular route guard allows us to grant or remove access to certain parts of the navigation. Another route guard, the CanDeactivate guard, even enable you to prevent a user from accidentally leaving a component with unsaved changes.

Why we need Angular guards

To prevent unauthorized access to certain parts of our navigation, use route guards in Angular.

The client-side route guards like this are not meant to be a security feature. They won’t prevent a smart user from figuring out a way to get to the protected routes.

Such security should be implemented on the server-side. So you need to develop the logic for the server-side, and based on the response, we will change the routes.

Route guards are instead meant as a way to improve the UX for your apps.

Types of routing guards

Route guards in Angular can prevent users from navigating to parts of an app without authorization.

There are 4 route guards available in Angular.

CanActivate: It controls if a route can be activated.
CanActivateChild: It controls if children of a route can be activated.
CanLoad: It controls if a route can even be loaded. This becomes useful for lazy-loaded feature modules. They won’t also load if the guard returns false.
CanDeactivate: It controls if the user can leave a route. Note that this guard doesn’t prevent the user from closing the browser tab or navigating to a different address. It only prevents actions from within the application itself.

To use route guards, consider using component-less routes as this facilitates guarding child routes.

How to Create Guard Service in Angular

To create a service for your guard, type the following command.

ng generate guard your-guard-name

In your guard class, implement the guard you want to use. The following example uses CanActivate to guard the route.

In your guard class, implement the guard you want to use. The following example uses CanActivate to guard the route.export class YourGuard implements CanActivate {
  canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): boolean {
      // your  logic goes here
  }
}

#angular #angular 10 #angular route

Roberta Ward

1593184320

Basics of Angular: Part-1

What is Angular? What it does? How we implement it in a project? So, here are some basics of angular to let you learn more about angular.

Angular is a Typescript-based open-source front-end web application platform. The Angular Team at Google and a community of individuals and corporations lead it. Angular lets you extend HTML’s syntax to express your apps’ components clearly. The angular resolves challenges while developing a single page and cross-platform applications. So, here the meaning of the single-page applications in angular is that the index.html file serves the app. And, the index.html file links other files to it.

We build angular applications with basic concepts which are NgModules. It provides a compilation context for components. At the beginning of an angular project, the command-line interface provides a built-in component which is the root component. But, NgModule can add a number of additional components. These can be created through a template or loaded from a router. This is what a compilation context about.

What is a Component in Angular?

Components are key features in Angular. It controls a patch of the screen called a view. A couple of components that we create on our own helps to build a whole application. In the end, the root component or the app component holds our entire application. The component has its business logic that it does to support the view inside the class. The class interacts with the view through an API of properties and methods. All the components added by us in the application are not linked to the index.html. But, they link to the app.component.html through the selectors. A component can be a component and not only a typescript class by adding a decorator @Component. Then, for further access, a class can import it. The decorator contains some metadata like selector, template, and style. Here’s an example of how a component decorator looks like:

@Component({
    selector: 'app-root',
    templateUrl: 'app.component.html',
    styleUrls: ['app.component.scss']
})

Role of App Module

Modules are the package of functionalities of our app. It gives Angular the information about which features does my app has and what feature it uses. It is an empty Typescript class, but we transform it by adding a decorator @NgModule. So, we have four properties that we set up on the object pass to @NgModule. The four properties are declarations, imports, providers, and bootstrap. All the built-in new components add up to the declarations array in @NgModule.

@NgModule({
declarations: [
  AppComponent,
],
imports: [
  BrowserModule,
  HttpClientModule,
  AppRoutingModule,
  FormsModule
],
bootstrap: [AppComponent]
})

What is Data Binding?

Data Binding is the communication between the Typescript code of the component and the template. So, we have different kinds of data binding given below:

When there is a requirement to output data from our Typescript code in the HTML template. String interpolation handles this purpose like {{data}} in HTML file. Property Binding is also used for this purpose like [property] = “data”.
When we want to trigger any event like clicking a button. Event Binding works while we react to user events like (event) = “expression”.
When we can react to user events and output something at the same time. Two-way Binding is used like [(ngModel)] = “data”.

image for understanding data binding

#angular #javascript #tech blogs #user interface (ui) #angular #angular fundamentals #angular tutorial #basics of angular

Adolphus Tillman

1656660840