Accessibility in Vue Multi select component
11 Jun 202411 minutes to read
The MultiSelect component has been designed, keeping in mind the WAI-ARIA specifications, and applies the WAI-ARIA roles, states, and properties along with keyboard support. This component is characterized by complete keyboard interaction support and ARIA accessibility support that makes it easy for people who use assistive technologies (AT) or those who completely rely on keyboard navigation.
The MultiSelect 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 MultiSelect component is outlined below.
- All features of the component meet the requirement.
- Some features of the component do not meet the requirement.
- The component does not meet the requirement.WAI-ARIA attributes
The MultiSelect component uses the Listbox role, and each list item has an option role. The following ARIA attributes denote the MultiSelect state.
| Properties | Functionalities |
|---|---|
| aria-haspopup | Indicates whether the MultiSelect input element has a popup list or not. |
| aria-expanded | Indicates whether the popup list has expanded or not. |
| aria-selected | Indicates the selected option. |
| aria-readonly | Indicates the readonly state of the MultiSelect element. |
| aria-disabled | Indicates whether the MultiSelect component is in a disabled state or not. |
| 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 MultiSelect without interruptions.
| Keyboard shortcuts | Actions |
|---|---|
| Arrow Down | Set focus at the first item in the MultiSelect when no item selected. Otherwise, moves focus next to the currently selected item. |
| Arrow Up | Moves focus previous to the currently selected one. |
| Page Down | Scrolls down to the next page and set focus to the first item when popup list opens. |
| Page Up | Scrolls up to the previous page and set focus to the first item when popup list opens. |
| Enter | Selects the focused item, and popup list closes when it is in open state. |
| Tab | Focuses on the next TabIndex element on the page when the popup is closed. Otherwise, closes the popup list and remains the focus of the component. |
| Shift + tab | Focuses on the previous TabIndex element on the page when the popup is closed. Otherwise, closes the popup list and remains the focus of the component. |
| Alt + Down | Opens the popup list. |
| Alt + Up | Closes the popup list. |
| Esc(Escape) | Closes the popup list when it is in an open state and the currently selected item remains the same. |
| Home | set focus to the first item. |
| End | set focus to the last item. |
In the below sample, focus the MultiSelect component using alt+t keys.
<template>
<div id="app">
<div id='container' style="margin:50px auto 0; width:250px;">
<br>
<ejs-multiselect id='multiselect' ref='multiselectInstance' :dataSource='sportsData' :fields='fields'
popupHeight="200px" placeholder="Find a game"></ejs-multiselect>
</div>
</div>
</template>
<script setup>
import { onMounted, ref } from "vue";
import { MultiSelectComponent as EjsMultiselect } from "@syncfusion/ej2-vue-dropdowns";
const multiselectInstance = ref(null);
onMounted(() => {
let multiselectObj = multiselectInstance.value;
document.onkeyup = function (e) {
if (e.altKey && e.keyCode === 84) {
// press alt+t to focus the control.
multiselectObj.ej2Instances.focusIn();
}
}
document.onclick = function (e) {
document.getElementsByClassName('e-multiselect')[0].classList.remove('e-input-focus');
}
});
const sportsData = [
{ id: 'Game1', game: 'Badminton' },
{ id: 'Game2', game: 'Basketball' },
{ id: 'Game3', game: 'Cricket' },
{ id: 'Game4', game: 'Football' },
{ id: 'Game5', game: 'Golf' },
{ id: 'Game6', game: 'Hockey' },
{ id: 'Game7', game: 'Rugby' },
{ id: 'Game8', game: 'Snooker' },
{ id: 'Game9', game: 'Tennis' }
];
const fields = { text: 'game', value: 'id' };
</script>
<style>
@import "../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../node_modules/@syncfusion/ej2-inputs/styles/material.css";
@import "../node_modules/@syncfusion/ej2-vue-dropdowns/styles/material.css";
@import "../node_modules/@syncfusion/ej2-buttons/styles/material.css";
</style><template>
<div id="app">
<div id='container' style="margin:50px auto 0; width:250px;">
<br>
<ejs-multiselect id='multiselect' ref='multiselectInstance' :dataSource='sportsData' :fields='fields'
popupHeight="200px" placeholder="Find a game"></ejs-multiselect>
</div>
</div>
</template>
<script>
import { MultiSelectComponent } from "@syncfusion/ej2-vue-dropdowns";
export default {
name: "App",
components: {
"ejs-multiselect": MultiSelectComponent
},
mounted() {
let multiselectObj = this.$refs.multiselectInstance;
document.onkeyup = function (e) {
if (e.altKey && e.keyCode === 84) {
// press alt+t to focus the control.
multiselectObj.ej2Instances.focusIn();
}
}
document.onclick = function (e) {
document.getElementsByClassName('e-multiselect')[0].classList.remove('e-input-focus');
}
},
data() {
return {
sportsData: [
{ id: 'Game1', game: 'Badminton' },
{ id: 'Game2', game: 'Basketball' },
{ id: 'Game3', game: 'Cricket' },
{ id: 'Game4', game: 'Football' },
{ id: 'Game5', game: 'Golf' },
{ id: 'Game6', game: 'Hockey' },
{ id: 'Game7', game: 'Rugby' },
{ id: 'Game8', game: 'Snooker' },
{ id: 'Game9', game: 'Tennis' }
],
fields: { text: 'game', value: 'id' }
}
}
}
</script>
<style>
@import "../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../node_modules/@syncfusion/ej2-inputs/styles/material.css";
@import "../node_modules/@syncfusion/ej2-vue-dropdowns/styles/material.css";
@import "../node_modules/@syncfusion/ej2-buttons/styles/material.css";
</style>Ensuring accessibility
The MultiSelect component’s accessibility levels are ensured through an accessibility-checker and axe-core software tools during automated testing.
The accessibility compliance of the MultiSelect component is shown in the following sample. Open the sample in a new window to evaluate the accessibility of the MultiSelect component with accessibility tools.