Accessibility in Angular Dialog component

24 Jan 20249 minutes to read

The Dialog component followed the accessibility guidelines and standards, including ADA, Section 508, WCAG 2.2 standards, and WCAG roles that are commonly used to evaluate accessibility.

The accessibility compliance for the Dialog component is outlined below.

Accessibility Criteria Compatibility
WCAG 2.2 Support Yes
Section 508 Support Yes
Screen Reader Support Yes
Right-To-Left Support Yes
Color Contrast Yes
Mobile Device Support Yes
Keyboard Navigation Support Yes
Accessibility Checker Validation Yes
Axe-core Accessibility Validation Yes
Yes - All features of the component meet the requirement.
Intermediate - Some features of the component do not meet the requirement.
No - The component does not meet the requirement.

WAI-ARIA attributes

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

The Dialog component uses the Dialog role and following ARIA properties to its element based on its state.

Property Functionalities
aria-describedby It indicates the Dialog content description is notified to the user through assistive technologies.
aria-labelledby The Dialog title is notified to the user through assistive technologies.
aria-modal For modal dialog it’s value is true and non-modal dialog its value is false
aria-grabbed Enable the draggable Dialog and starts dragging it is value is true and stopping the drag its value is false

Keyboard interaction

Keyboard interaction of Dialog component has designed based on WAI-ARIA Practices described for Dialog.
User can use the following shortcut keys to interact with the Dialog.

Keyboard shortcuts Actions
Esc Closes the Dialog. This functionality can be controlled by using [closeOnEscape](https://ej2.syncfusion.com/angular/documentation/api/dialog/#closeonescape)
Enter When the Dialog button or any input (except text area) is in focus state, when pressing the Enter key, the click event associated with the primary button or button will trigger. Enter key is not working when the Dialog content contains any text area with initial focus
Ctrl + Enter When the Dialog content contains text area and it is in focus state, and press the Ctrl + Enter key to call the click event function associated with primary button
Tab Focus will be changed within the Dialog elements
Shift + Tab The Focus will be changed previous focusable element within the Dialog elements. When focusing a first focusable element in the Dialog, then press the shift + tab key, it will change the focus to last focusable element 
import { Component, ViewChild, OnInit, ElementRef } from '@angular/core';
import { DialogComponent } from '@syncfusion/ej2-angular-popups';
import { EmitType } from '@syncfusion/ej2-base';

@Component({
    selector: 'app-root',
    template: `
    <button class="e-control e-btn" style="position: absolute;" id="targetButton" (click)="onOpenDialog($event)">Open Dialog</button>
    <div #container class='root-container'></div>
      <ejs-dialog id='dialog' #ejDialog header='Feedback' [target]='targetElement'
      width='400px' [buttons]='buttons' showCloseIcon='true' height='300px'>
      <ng-template #content>
            <form>
                <div class='form-group'><label for='email'>Email:</label>
                    <input type='email' class='form-control' id='email'>
                </div>
                <div class='form-group'></div>
                <div class='form-group'>
                    <label for='comment'>Comments:</label>
                    <textarea style='resize: none;' class='form-control' rows='5' id='comment'></textarea>
                </div>
            </form>
      </ng-template>
      </ejs-dialog>
        `
})

export class AppComponent implements OnInit {
    @ViewChild('ejDialog') ejDialog: DialogComponent | any;
    // Create element reference for dialog target element.
    @ViewChild('container', { read: ElementRef }) container: ElementRef |any;

    public targetElement?: HTMLElement;

    //To get all element of the dialog component after component get initialized.
    ngOnInit() {
      this.initilaizeTarget();
    }

    // Initialize the Dialog component target element.
    public initilaizeTarget: EmitType<object> = () => {
      this.targetElement = this.container.nativeElement.parentElement;
    }
    // Hide the Dialog when click the footer button.
    public hideDialog: EmitType<object> = () => {
        this.ejDialog.hide();
    }
    // Enables the footer buttons
    public buttons: Object = [
        {
            'click': this.hideDialog.bind(this),
            // Accessing button component properties by buttonModel property
              buttonModel:{
              content:'Submit',
              isPrimary:true
            }
        }
    ];
    // Sample level code to handle the button click action
    public onOpenDialog =  (event: any): void => {
        // Call the show method to open the Dialog
        this.ejDialog.show();
    }
}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { DialogModule } from '@syncfusion/ej2-angular-popups';
/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
		DialogModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

import 'zone.js';
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);

See Also

Ensuring accessibility

The Dialog component’s accessibility levels are ensured through an accessibility-checker and axe-core software tools during automated testing.

The accessibility compliance of the Dialog component is shown in the following sample. Open the sample in a new window to evaluate the accessibility of the Dialog component with accessibility tools.

See also