Slider validation using template driven forms in Angular Range slider component

17 Nov 20222 minutes to read

Slider can be validated in Angular using Template-driven forms.

• The following CSS classes will be added on Slider component based on the action done by user.

Class if true	Class if false	state
ng-touched	ng-untouched	The control has been visited.
ng-dirty	ng-pristine	The control’s value has changed.
ng-valid	ng-invalid	The control’s value is valid.

app.component.ts

import { Component, ViewEncapsulation, ViewChild } from '@angular/core';
import { SliderModule } from '@syncfusion/ej2-angular-inputs';
import {NgForm} from '@angular/forms';

@Component({
    selector: 'my-app',
    templateUrl: 'app/template.html',
    styleUrls:['index.css'],
    encapsulation: ViewEncapsulation.None
})

export class AppComponent {
   value; validated;
  @ViewChild('sliderForm') form: NgForm;
     onSubmit() {
       this.validated = true;
       console.log(this.form.valid)
  }

  ngOnInit() {
   this.value =70;
 }
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { SliderValidaton } from './sliderValidation';
import { SliderModule } from '@syncfusion/ej2-angular-inputs';
import { FormsModule } from '@angular/forms';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        SliderModule,
        FormsModule
    ],
    declarations: [AppComponent, SliderValidaton],
    bootstrap: [AppComponent]
})
export class AppModule { }

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

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