Accessibility in Angular Mention component

14 Nov 20224 minutes to read

Web accessibility makes web content and web applications more accessible for people with disabilities. Mention component provides built-in compliance with WAI-ARIA specifications. The WAI-ARIA support is achieved using the attributes such as aria-selected and aria-activedescendent.

ARIA attributes

The Mention component uses the Listbox role where each list item has an option role. The following ARIA attributes denote the Mention state.

Properties	Functionalities
aria-selected	Indicates the selected option.
aria-activedescendent	This attribute holds the ID of the active list item to focus its descendant child element.
aria-owns	This attribute contains the ID of the popup list to indicate popup as a child element.

Keyboard interaction

You can use the following key shortcuts to access the Mention without interruptions.

Keyboard shortcuts	Actions
Arrow Down	Selects the first item in the Mention list. Otherwise, selects the item next to the currently selected item.
Arrow Up	Selects the item previous to the currently selected one.
Esc(Escape)	Closes the popup list when it is in an open state.
Enter	Selects the focused item, and when it is in an open state the popup list closes.
Tab	Focuses on the next TabIndex element on the page when the popup is closed. Otherwise, inserts the selected popup list item and closes the popup list.

app.component.ts

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

@Component({
  selector: 'app-root',
  template: `<label id="comment" >Comments</label>
  <div id="mentionElement" placeholder = "Type @ and tag user"></div>
  <ejs-mention [dataSource]='userData' [target]='mentionTarget' [fields]='fields'></ejs-mention>`,
  styleUrls: ['index.css']

})
export class AppComponent {
  constructor() {
  }
  public userData: { [key: string]: Object }[] = [
    { Name : "Andrew Fuller", ID : "1" },
    { Name : "Anne Dodsworth" , ID : "2" },
    { Name : "Janet Leverling" , ID :  "3" },
    { Name : "Laura Callahan" , ID : "4" },
    { Name : "Margaret Peacock" , ID : "5" }
  ];
  public fields: Object = {text:'Name'};
  public mentionTarget: string = "#mentionElement";
}

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
import { MentionModule } from '@syncfusion/ej2-angular-dropdowns';
/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,FormsModule, ReactiveFormsModule, MentionModule
    ],
    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);