@pdanpdan/vue-keyboard-trap

VueKeyboardTrap (vue-keyboard-trap)

Project description

Vue directive for keyboard navigation - roving movement and trapping inside container.

Works both for Vue3 and Vue2.

Demo codepen

Docs and examples

Source code, Issues, Discussions

Install

yarn add @pdanpdan/vue-keyboard-trap

or

npm install @pdanpdan/vue-keyboard-trap

Playground

Demo codepen

Usage

Usage as ESM

Can be globally registered on the App (plugin mode)

import { createApp } from 'vue';
import { VueKeyboardTrapDirectivePlugin } from '@pdanpdan/vue-keyboard-trap';
import App from './App.vue';

const app = createApp(App);

app.use(VueKeyboardTrapDirectivePlugin, {
  // ...options if required
});

app.mount('#app');

or included in specific components (script)

import { defineComponent } from 'vue';
import { VueKeyboardTrapDirectiveFactory } from '@pdanpdan/vue-keyboard-trap';

const KbdTrap = VueKeyboardTrapDirectiveFactory({
  // ...options if required
}).directive;

export default defineComponent({
  directives: {
    KbdTrap,
  },
});

or included in specific components (script setup)

import { VueKeyboardTrapDirectiveFactory } from '@pdanpdan/vue-keyboard-trap';

const vKbdTrap = VueKeyboardTrapDirectiveFactory({
  // ...options if required
}).directive;

The directive does not require any CSS styles to work, but for cosmetic purposes some example styles are provided in dist/styles/index.sass.

import '@pdanpdan/vue-keyboard-trap/styles';

or (if the /styles export is not used by your packer)

import '@pdanpdan/vue-keyboard-trap/dist/styles/index.sass';

Usage as UMD

Load the javascript from https://cdn.jsdelivr.net/gh/pdanpdan/vue-keyboard-trap@latest/dist/index.umd.js.

It will expose a global object VueKeyboardTrap with VueKeyboardTrap.VueKeyboardTrapDirectivePlugin and VueKeyboardTrap.VueKeyboardTrapDirectiveFactory.

const { createApp } = Vue;
const { VueKeyboardTrapDirectivePlugin } = VueKeyboardTrap;

const app = createApp({});

app.use(VueKeyboardTrapDirectivePlugin, {
  // ...options if required
});

app.mount('#q-app');

or as directive

const { createApp } = Vue;
const { VueKeyboardTrapDirectiveFactory } = VueKeyboardTrap;

const app = createApp({});

const { name, directive } = VueKeyboardTrapDirectiveFactory({
  // ...options if required
});

app.directive(name, directive);

app.mount('#q-app');

If you want you can access the SASS cosmetic style from https://cdn.jsdelivr.net/gh/pdanpdan/vue-keyboard-trap@latest/dist/styles/index.sass.

Directive configuration options

• name: snake-case name of the directive (without v- prefix) - default kbd-trap
• datasetName: camelCase name of the data-attribute to be set on element when trap is enabled - default v${ PascalCase from name}
• focusableSelector: CSS selector for focusable elements
• rovingSkipSelector: CSS selector for elements that should not respond to roving key navigation (input, textarea, ...)
• gridSkipSelector: CSS selector that will be applied in .roving.grid mode to exclude elements - must be a series of :not() selectors
• autofocusSelector: CSS selector for the elements that should be autofocused
• trapTabIndex: tabIndex value to be used when trap element has a tabIndex of -1 and has no tabindex attribute (default -9999)

Default focusableSelector:

:focus,
a[href]:not([tabindex^="-"]),
area[href]:not([tabindex^="-"]),
input:not([disabled]):not([tabindex^="-"]),
select:not([disabled]):not([tabindex^="-"]),
textarea:not([disabled]):not([tabindex^="-"]),
button:not([disabled]):not([tabindex^="-"]),
iframe:not([tabindex^="-"]),
[tabindex]:not([tabindex^="-"]),
[contenteditable]:not([tabindex^="-"]):not([contenteditable="false"]),
[class*="focusable"]:not([disabled]):not([tabindex^="-"])

By default a tags without href are not focusable - add a tabindex="0" attribute on them to make them focusable. This can be done for all other elements if you want them to be focusable.

Default rovingSkipSelector:

input:not([disabled]):not([type="button"]):not([type="checkbox"]):not([type="file"]):not([type="image"]):not([type="radio"]):not([type="reset"]):not([type="submit"]),
select:not([disabled]),
select:not([disabled]) *,
textarea:not([disabled]),
[contenteditable]:not([contenteditable="false"]),
[contenteditable]:not([contenteditable="false"]) *

Default gridSkipSelector:

:not([disabled]),
:not([tabindex^="-"])

Default autofocusSelector:

[autofocus]:not([disabled]):not([autofocus="false"]),
[data-autofocus]:not([disabled]):not([data-autofocus="false"])

Dynamic enable/disable

Use the value of the directive (boolean) to enable/disable it.

<div v-kbd-trap="directiveEnabled">

The modifiers are reactive so if you use render functions you can dynamically change the behaviour.

Directive modifiers

• .autofocus - autofocuses the first element that matches autofocusSelector or (if no such element is found) the first focusable child element when the directive is mounted or enabled (only if it not covered by another element)
• .roving (or .roving.vertical.horizontal) - allow roving navigation (Home, End, ArrowKeys)
• .roving.vertical - allow roving navigation (Home, End, ArrowUp, ArrowDown)
• .roving.horizontal - allow roving navigation (Home, End, ArrowLeft, ArrowRight)
• .roving.grid - allow roving navigation (Home, End, ArrowKeys) using dataset attrs on elements [data-${ camelCase from datasetName }-(row|col)]; [data-${ camelCase from datasetName }-(row|col)~="*"] is a catchall
• .roving used on an element with [role="grid"] - allow roving navigation (Home, End, ArrowKeys) using role attrs on elements [role="row|gridcell"]
• .roving.tabinside - Tab key navigates to next/prev element inside trap (by default Tab key navigates to next/prev element outside trap in roving mode)
• .escrefocus - refocus element that was in focus before activating the trap on Esc
• .escexits - refocus a parent trap on Esc (has priority over .escrefocus)

Keyboard navigation

• TAB / SHIFT+TAB key
  • moves to next / previous focusable element inside the trap group (moves from last one to first one or from first one to last one when no more focusable elements are available in the group)
  • if .roving modifier is used moves to next / previous trap group or focusable element outside the current trap group
  • if .roving.tabinside modifiers are used then move inside the trap group
• ESC key
  • disables / enables the current tab group
  • if .escexits modifier is used then refocus the last active focusable element in a parent trap group
  • if .escrefocus modifier is used then refocus the last focusable element that was active before the current trap group got focus
• HOME / END when .roving modifier is used
  • move to first / last focusable element in the current trap group
• ARROW_KEYS when .roving modifier is used (.roving.horizontal.vertical is the same as .roving)
  • if only .horizontal modifier is used then only ARROW_LEFT / ARROW_RIGHT keys can be used
  • if only .vertical modifier is used then only ARROW_UP / ARROW_DOWN keys can be used
  • ARROW_LEFT / ARROW_UP move to the previous focusable element inside the trap group
  • ARROW_RIGHT / ARROW_DOWN move to the next focusable element inside the trap group
• ARROW_KEYS when .roving.grid modifiers are used or .roving modifier on a trap element with [role="grid"]
  • move in the grid inside the current trap group

Keyboard navigation inside .roving.grid trap groups

In order to specify the navigation pattern you must use 2 dataset attributes on the focusable elements inside the .roving trap group:

• data-v-kbd-trap-row specifies the numeric identifier of the row the element belongs to (numbers need not be consecutive, but their natural order determines the navigation order)
• data-v-kbd-trap-col specifies the numeric identifier of the column the element belongs to (numbers need not be consecutive, but their natural order determines the navigation order)

Any or both attributes can have a value of * that means that it is an alement that can be focused from elements having any coresponding (row or col) attribute.

Navigation rules

• the first focusable element on the row / col (based on direction of movement) is focused
• an element with * for row or col is considered to belong to any row / col

Keyboard navigation inside .roving trap groups with [role="grid"]

In order to specify the navigation pattern you must use role attributes [role="row"] and [role="gridcell"].

All focusable element must have [role="gridcell"] and must be inside [role="row"] elements inside [role="grid"] trap element.

The gridcells will be considered inline-start aligned in every row.

Navigation rules

• the first focusable element on the row / col (based on direction of movement) is focused

RTL / LTR

The directive checks the closest parent DOM Element of the active element that has a [dir="rtl"] or [dir="ltr]` attribute.

If the direction is RTL the ARROW_LEFT and ARROW_RIGHT keys move in reverse (according to document order of the focusable elements) but consistent to the way the elements are order on screen.

CSS (visual hints for users)

The directive does not require any styles, but it might help the users to have visual hints for navigation.

A default style is provided in dist/styles/index.sass (can be imported as import from '@pdapdan/vue-keyboard-trap/styles', as import from '@pdapdan/vue-keyboard-trap/dist/styles/index.sass' (if the packer does not use the /styles export) or included from https://cdn.jsdelivr.net/gh/pdanpdan/vue-keyboard-trap@latest/dist/styles/index.sass).

There are 3 CSS variables that can be used to customize the aspect of the hints:

• --color-v-kbd-trap-enabled - the text color when directive is enabled
• --color-v-kbd-trap-disabled - the text color when directive is disabled
• --color-v-kbd-trap-background - the background color of the hint area

In the default style the hint is positioned on the top-right corner of the trap group.

// defaults
$ColorVKeyboardTrapEnabled: #c33 !default
$ColorVKeyboardTrapDisabled: #999 !default
$ColorVKeyboardTrapBackground: #eeee !default

// place your custom colors on any element and they will be applied on children
// :root
//   --color-v-kbd-trap-enabled: #c33
//   --color-v-kbd-trap-disabled: #999
//   --color-v-kbd-trap-background: #eeee

[data-v-kbd-trap]:after
  content: var(--v-kbd-trap, '') var(--v-kbd-trap-esc, '') var(--v-kbd-trap-tab, '') var(--v-kbd-trap-roving, '')
  pointer-events: none
  position: absolute
  top: 2px
  right: 2px
  font: italic small-caps bold 14px monospace
  line-height: 1em
  padding: 4px
  color: var(--color-v-kbd-trap-disabled, $ColorVKeyboardTrapDisabled)
  background-color: var(--color-v-kbd-trap-background, $ColorVKeyboardTrapBackground)
  border-radius: 2px
  z-index: 1
[data-v-kbd-trap]
  --v-kbd-trap: 'Trap'
  --v-kbd-trap-esc: ''
  --v-kbd-trap-tab: ''
  --v-kbd-trap-roving: ''
[data-v-kbd-trap]:focus-within
  --v-kbd-trap: 'Trap/'
  --v-kbd-trap-esc: 'Esc'
[data-v-kbd-trap-active]
  --v-kbd-trap: '' !important
  --v-kbd-trap-esc: 'Esc'
  --v-kbd-trap-tab: '/Tab'
  --v-kbd-trap-roving: ''
[data-v-kbd-trap-active][data-v-kbd-trap~="roving"]
  --v-kbd-trap-tab: '/Tab\21C5'
  --v-kbd-trap-roving: '/\2962\2963\2965\2964'
[data-v-kbd-trap-active][data-v-kbd-trap~="roving"][data-v-kbd-trap~="tabinside"]
  --v-kbd-trap-tab: '/Tab'
[data-v-kbd-trap-active][data-v-kbd-trap~="roving"][data-v-kbd-trap~="vertical"]
  --v-kbd-trap-roving: '/\2963\2965'
[data-v-kbd-trap-active][data-v-kbd-trap~="roving"][data-v-kbd-trap~="horizontal"]
  --v-kbd-trap-roving: '/\2962\2964'
[data-v-kbd-trap-active][data-v-kbd-trap~="roving"][data-v-kbd-trap~="grid"],
[data-v-kbd-trap-active][data-v-kbd-trap~="roving"][role="grid"]
  --v-kbd-trap-roving: '/\229E'
[data-v-kbd-trap-active][data-v-kbd-trap~="escrefocus"]
  --v-kbd-trap-esc: 'Esc\2949'
[data-v-kbd-trap-active][data-v-kbd-trap~="escexits"]
  --v-kbd-trap-esc: 'Esc\2923'
[data-v-kbd-trap][tabindex="-9999"]
  outline: none
[data-v-kbd-trap][data-v-kbd-trap-active]:after
  color: var(--color-v-kbd-trap-enabled, $ColorVKeyboardTrapEnabled)

Development

Install the dependencies

yarn

Start development mode (hot-code reloading, error reporting, etc.)

yarn dev

Lint the files

yarn lint

Build for production

yarn build

Source code, issues, bug reports, feature requests

Vue Keyboard Trap (vue-keyboard-trap)

Author

• Name: Dan Popescu (PDan)
• Email: [e-mail]
• Website: https://github.com/pdanpdan/
• Github: @pdanpdan

License

Copyright © 2022-present Dan Popescu.

This application is distributed under , see LICENSE for more information.