Getting started with Angular Circular gauge component

18 Nov 20226 minutes to read

This section explains you the steps required to create a simple circular gauge and demonstrate the basic usage of circular gauge control.

Setup Angular Environment

You can use Angular CLI to setup your Angular applications.
To install Angular CLI use the following command.

npm install -g @angular/cli

Create an Angular Application

Start a new Angular application using below Angular CLI command.

ng new my-app
cd my-app

Installing Syncfusion Circular Gauge package

Syncfusion packages are distributed in npm as @syncfusion scoped packages. You can get all the Angular Syncfusion package from npm link.

Currently, Syncfusion provides two types of package structures for Angular components,

  1. Ivy library distribution package format
  2. Angular compatibility compiler(Angular’s legacy compilation and rendering pipeline) package.

Ivy library distribution package

Syncfusion Angular packages(>=20.2.36) has been moved to the Ivy distribution to support the Angular Ivy rendering engine and the package are compatible with Angular version 12 and above. To download the package use the below command.

Add @syncfusion/ej2-angular-circulargauge package to the application.

npm install @syncfusion/ej2-angular-circulargauge --save

Angular compatibility compiled package(ngcc)

For Angular version below 12, you can use the legacy (ngcc) package of the Syncfusion Angular components. To download the ngcc package use the below.

Add @syncfusion/ej2-angular-circulargauge@ngcc package to the application.

npm install @syncfusion/ej2-angular-circulargauge@ngcc --save

To mention the ngcc package in the package.json file, add the suffix -ngcc with the package version as below.

@syncfusion/ej2-angular-circulargauge:"20.2.38-ngcc"

Note: If the ngcc tag is not specified while installing the package, the Ivy Library Package will be installed and this package will throw a warning.

Registering Circular Gauge Module

Import Circular Gauge module into Angular application(app.module.ts) from the package @syncfusion/ej2-angular-circulargauge [src/app/app.module.ts].

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
// import the CircularGaugeModule for the Circular Gauge component
import { CircularGaugeModule } from '@syncfusion/ej2-angular-circulargauge';
import { AppComponent }  from './app.component';

@NgModule({
  //declaration of ChartModule into NgModule
  imports:      [ BrowserModule, CircularGaugeModule ],
  declarations: [ AppComponent ],
  bootstrap:    [ AppComponent ]
})
export class AppModule { }
  • Modify the template in app.component.ts file to render the ej2-angular-circulargauge component
    [src/app/app.component.ts].
import { Component, ViewEncapsulation } from '@angular/core';

@Component({
  selector: 'app-container',
  // specifies the template string for the Charts component
  template: `<ejs-circulargauge id='circular-container'></ejs-circulargauge>`,
  encapsulation: ViewEncapsulation.None
})
export class AppComponent  { }

Now use the app-container in the index.html instead of default one.

<app-container></app-container>
  • Now run the application in the browser using the below command.
npm start

The below example shows a basic Circular Gauge.

import { Component } from '@angular/core';

@Component({
    selector: 'app-container',
    // specifies the template string for the CircularGauge component
    template: `<ejs-circulargauge id="circular-container"></ejs-circulargauge>`
})
export class AppComponent {

}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { CircularGaugeModule } from '@syncfusion/ej2-angular-circulargauge';
import { GaugeTooltipService } from '@syncfusion/ej2-angular-circulargauge';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, CircularGaugeModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ GaugeTooltipService ]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

Set Pointer Value

Pointer value is used to indicate the gauge value using value property in pointers.

import { Component, OnInit } from '@angular/core';

@Component({
    selector: 'app-container',
    template:
    `<ejs-circulargauge id="circular-container">
        <e-axes>
            <e-axis>
                <e-pointers>
                    <e-pointer value=35></e-pointer>
                </e-pointers>
            </e-axis>
        </e-axes>
    </ejs-circulargauge>`
})
export class AppComponent implements OnInit {
    ngOnInit(): void {
        // Initialize objects.
    }

}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { CircularGaugeModule } from '@syncfusion/ej2-angular-circulargauge';
import { GaugeTooltipService } from '@syncfusion/ej2-angular-circulargauge';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule, CircularGaugeModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent],
    providers: [ GaugeTooltipService ]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);