How to Create a Rating Component with Bootstrap, HTML and Angular 10

How to Create a Rating Component with Bootstrap, HTML and Angular 10

We’ll see by example how to create a rating component with Bootstrap 4, HTML Select, and Angular 10 Forms. We’ll be using the ngb-rating component from ng-bootstrap. NgBoostrap is the Angular adapted version of Bootstrap UI components. Using ng-bootstrap we can easily integrate bootstrap library to our Angular project and use it’s awesome UI components very easily.

In this tutorial, we’ll see by example how to create a rating component with Bootstrap 4, HTML Select, and Angular 10 Forms. We’ll be using the ngb-rating component from ng-bootstrap. We'll also see how to use the HTML select control with the ngFor directive inside a reactive form. How to bind select element to a TypeScript object or string literal using [ngValue] and value properties respectively, and how to assign a default value to select from an array of elements.

NgBoostrap_ is the Angular adapted version of Bootstrap UI components. Using ng-bootstrap we can easily integrate bootstrap library to our Angular project and use it’s awesome UI components very easily._

Bootstrap is tried and tested and fully responsive for multiple platforms and screen sizes. Moreover, it is now an industrial standard adopted almost everywhere.

HTML forms are necessary in most web applications. Selects in forms can be used when you have multiple options and want users to select one of them before submitting the form. In Angular, you can use objects for option values and not only strings.

This is an example of a component template with the select control:

In our Angular component, we need to have a cities array with some cities.

We use the value property to bind the city to select but you can also use ngValue instead. The value property is used with string literals only, whereas ngValue can be used with objects. We'll see next another example of using select with objects instead of strings.

This comes handy if we have a drop-down where we need to show the names of the objects from a TypeScript array. But when selecting the element from the drop-down you need to select the id of the array element for querying the database for example. In this case, we need to use ngValue as it works with TypeScript objects and not just strings.

In the previous tutorial, you’ve seen how you can install Angular 10 CLI from npm, so let’s start by creating a new project.

Creating a New Angular 10 Project

Let’s get started by creating a new Angular 10 project using the following command:

$ ng new AngularRatingExample 

? Would you like to add Angular routing? Yes ? Which stylesheet format would you like to use? CSS

Adding Ng-Bootstrap

We’ll see how to set up Bootstrap in our project for styling our UI using ng-bootstrap. For that purpose, we'll first need to add bootstrap and ng-bootstrap from npm in our project using the following command:

$ cd AngularRatingExample $ ng add @ng-bootstrap/ng-bootstrap

This will install ng-bootstrap for the default application specified in your angular.json file.

Since ng-bootstrap has a dependency on i18n, we'll also need add the package to our project using the following command:

$ ng add @angular/localize

Next, open the src/app/app.module.ts file and add NgbModule and ReactiveFormsModule in the imports array of AppModule as follows:

// [...] 

import { ReactiveFormsModule } from '@angular/forms'; 
import { NgbModule } from '@ng-bootstrap/ng-bootstrap';

@NgModule({ imports: [ // [...] ReactiveFormsModule, NgbModule ], })

Next, open the src/app/app.component.html file and update it as follows:

We simply wrap the router outlet with some HTML markup styled with Bootstrap 4.

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