Angular Chat - Accessibility

Accessibility Features Overview

NOTE
The overall accessibility level of your application depends on the Chat features you use.
Accessibility Requirement Support Level
Right-to-Left Support
Keyboard Navigation Support
Screen Reader Support
Contrast Color Theme
Mobile Device Support
Lighthouse Accessibility Validation
Axe Accessibility Validation
WAVE Accessibility Validation
Section 508 Support
WCAG 2.x Support
  • - All component features meet the requirement
  • - Some component features may not meet the requirement
  • - Accessibility requirement is not supported

Accessibility Standards Compliance

The Chat component meets a variety of Section 508 and WCAG 2.x compliance standards. Known exceptions:

Section 508 criteria WCAG 2.x criteria Exception description
501 (Web)(Software)
504.2 (Authoring Tool)
602.3 (Support Docs)		 1.4.3 Contrast (Minimum) (Level AA)
1.4.11 Non-text Contrast (Level AA 2.1 and 2.2)		 Chat does not support Windows High Contrast themes.

Keyboard Navigation

A user can use the following keys to interact with the Chat component:

Key Action
Enter Enters a message.

Use the registerKeyHandler(key, handler) method to implement a custom handler for a key.

jQuery
JavaScript
function registerKeyHandlers () {
    const chat = $("#chatContainer").dxChat("instance");
    chat.registerKeyHandler("backspace", function(e) {
        // The argument "e" contains information on the event
    });
    chat.registerKeyHandler("space", function(e) {
        // ...
    });
}
Angular
TypeScript
import { ..., ViewChild, AfterViewInit } from '@angular/core';
import { DxChatModule, DxChatComponent } from 'devextreme-angular';
// ...
export class AppComponent implements AfterViewInit {
    @ViewChild(DxChatComponent, { static: false }) chat: DxChatComponent;
    // Prior to Angular 8
    // @ViewChild(DxChatComponent) chat: DxChatComponent;

    ngAfterViewInit () {
        this.chat.instance.registerKeyHandler('backspace', function(e) {
            // The argument "e" contains information on the event
        });
        this.chat.instance.registerKeyHandler('space', function(e) {
            // ...
        });
    }
}
@NgModule({
    imports: [
        // ...
        DxChatModule
    ],
    // ...
})
Vue
<template>
    <DxChat :ref="myChatRef" />
</template>
<script>
import 'devextreme/dist/css/dx.light.css';

import DxChat from 'devextreme-vue/chat';

const myChatRef = 'my-chat';

export default {
    components: {
        DxChat
    },
    data() {
        return {
            myChatRef
        }
    },
    computed: {
        chat: function() {
            return this.$refs[myChatRef].instance;
        }
    },
    mounted: function() {
        this.chat.registerKeyHandler('backspace', function(e) {
            // The argument "e" contains information on the event
        });
        this.chat.registerKeyHandler('space', function(e) {
            // ...
        });
    }
}
</script>
React
App.js
import React from 'react';
import 'devextreme/dist/css/dx.light.css';

import { Chat } from 'devextreme-react/chat';

class App extends React.Component {
    constructor(props) {
        super(props);

        this.chatRef = React.createRef();
    }

    render() {
        return (
            <Chat ref={this.chatRef} />
        );
    }

    get chat() {
        return this.chatRef.current.instance();
    }

    componentDidMount() {
        this.chat.registerKeyHandler('backspace', function(e) {
            // The argument "e" contains information on the event
        });
        this.chat.registerKeyHandler('space', function(e) {
            // ...
        });
    }
}

export default App;

Screen Reader Support

The Chat component supports screen readers and complies to WAI-ARIA standards.