Accessibility in Angular Range slider component

17 Nov 20224 minutes to read

The Slider is characterized with complete ARIA Accessibility support that helps to access by on-screen readers and other assistive technology devices. This component is designed with the reference of guidelines document given in the WAI ARAI Accessibility Practices.

The Slider component uses the Slider role and the following ARIA properties for its element based on the state.

Property	Functionalities
aria-valuenow	It Indicates the current value of the slider.
aria-valuetext	Returns the current text of the slider.
aria-valuemin	It Indicates the Minimum value of the slider.
aria-valuemax	It Indicates the Maximum value of the slider.
aria-orientation	It Indicates the Slider Orientation.
aria-label	Slider left and right button label text (increment and decrement).
aria-labelledby	It indicates the name of the Slider.

Keyboard interaction

The Keyboard interaction of the Slider component is designed based on the WAI-ARIA Practices described for Slider.
Users can use the following shortcut keys to interact with the Slider.

Keyboard shortcuts	Actions
Right Arrow   |   Up Arrow	Increase the Slider value.
Left Arrow   |   Down Arrow	Decrease the Slider value.
Home	Moves to the start value (for Range Slider when the second thumb is focused and the Home key is pressed, it moves to the first thumb value).
End	Moves to the end value (for Range Slider when the first thumb is focused and the End key is pressed, it moves to the second thumb value).
Page Up	Increases the Slider by `largeStep` value.
Page Down	Decreases the Slider by `largeStep` value.

app.component.ts

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

@Component({
    selector: 'my-app',
    templateUrl: 'app/template.html',
    styleUrls:['index.css']
})

export class AppComponent {
    public tooltipData01: Object = { placement: 'Before', isVisible: true, showOn: 'Always' };
    public ticksData01: Object = { placement: 'After', largeStep: 20, smallStep: 10, showSmallTicks: true };
    public mintype: string = 'MinRange';

    public tooltipData02: Object = { placement: 'Before', isVisible: true, showOn: 'Always' };
    public ticksData02: Object = { placement: 'After', largeStep: 1 };

    tooltipChangeHandler(args: SliderTooltipEventArgs): void {
        // Weekdays Array
        let daysArr: string [] = ['Sunday','Monday','Tuesday','Wednesday','Thrusday','Friday','Saturday'];
        // Customizing each ticks text into weeksdays
        args.text = daysArr[parseFloat(args.text)];
    }

    renderingTicksHandler(args: SliderTickEventArgs): void {
        // Customizing tooltip to display the Day (in numeric) of the week
        args.text =  'Day ' + (Number(args.text) + 1).toString();
    }
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { SliderModule } from '@syncfusion/ej2-angular-inputs';
/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
        SliderModule
    ],
    declarations: [AppComponent],
    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);