Angular Gallery - Accessibility

Accessibility Features Overview

NOTE
The overall accessibility level of your application depends on the Gallery 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 Gallery component complies to all Section 508 and WCAG 2.x standards criteria.

Keyboard Navigation

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

Key Action
← / ↑ Shows the previous image.
→ / ↓ Shows the following image.

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

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

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

import DxGallery from 'devextreme-vue/gallery';

const myGalleryRef = 'my-gallery';

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

import { Gallery } from 'devextreme-react/gallery';

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

        this.galleryRef = React.createRef();
    }

    render() {
        return (
            <Gallery ref={this.galleryRef} />
        );
    }

    get gallery() {
        return this.galleryRef.current.instance;
    }

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

export default App;

Screen Reader Support

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

To improve accessibility, specify the imageAlt attribute for each Gallery image.