A virtual keyboard based on Vue 3.2 (and tailwindcss & floating ui).


npm install @dongivan/virtual-keyboard --save


With tailwindcss

Set content in your tailwind.config.ts:

module.export = {  /* ... */  content: [    /* ... */    "./node_modules/@dongivan/virtual-keyboard/**/*.js",  ]  /* ... */}

Without tailwindcss

import "@dongivan/virtual-keyboard/default.css";

Components Usage

Just import and use it in your template.

<template>  <VirtualKeyboard class="..." @key-pressed="(key) => ...">    <div class="...">      <KeyButton v-for="i of 10" :key="`key-${i - 1}`" :value="i - 1" />    </div>  </VirtualKeyboard></template><script setup lang="ts">import {  VirtualKeyboard,  KeyButton,} from "@dongivan/virtual-keyboard"</script>

You can use KeyboardPage if you have multiple pages of virtual keyboard (remember to use PageButton to change the current page).

<template>  <VirtualKeyboard class="..." @key-pressed="(key) => ...">    <KeyboardPage name="num" default>      <div class="...">        <KeyButton v-for="i of 10" :key="`key-${i - 1}`" :value="i - 1" />      </div>    </KeyboardPage>    <KeyboardPage name="eng" default>      <div class="...">        <KeyButton v-for="v of 'abcdefghijklmnopqrstuvwxyz'.split('')" :key="`key-${v}`" :value="v" />      </div>    </KeyboardPage>    <div class="...">      <PageButton value="num" :children="['eng']" />    </div>  </VirtualKeyboard></template><script setup lang="ts">import {  VirtualKeyboard,  KeyButton,  KeyboardPage,  PageButton,} from "@dongivan/virtual-keyboard"</script>

ShiftButton will shift the current keyboard page (which means each key in current keyboard page will be shifted if it could).

<template>  <VirtualKeyboard class="..." @key-pressed="(key) => ...">    <div class="...">      <KeyButton v-for="v of 'abcdefghijklmnopqrstuvwxyz'.split('')" :key="`key-${v}`" :children="[v.toUpperCase()]" :value="v" />    </div>    <div class="...">      <ShiftButton />    </div>  </VirtualKeyboard></template><script setup lang="ts">import {  VirtualKeyboard,  KeyButton,  ShiftButton,} from "@dongivan/virtual-keyboard"</script>


There is a common prop named config with type VirtualKeyboardConfig in each component. The component will provide the config prop to its children components, and the children will merge it with their own config prop.

type ClassName = string | string[];type ButtonClass = {  btn?: ClassName;  hover?: ClassName;  focus?: ClassName;  active?: ClassName;};type HasBadgeClass = {  badge?: ClassName;  slotBadge?: ClassName;};type VirtualKeyboardConfig = {  pageClass?: ClassName;  buttonClass?: ButtonClass & HasBadgeClass;  childrenContainerClass?: ClassName;  childButtonClass?: ButtonClass;  childrenContainerOffset?: {    mainAxis?: number;    crossAxis?: number;    alignmentAxis?: number;  };};
const defaultConfig: VirtualKeyboardConfig = {  pageClass: "flex gap-1 flex-wrap",  buttonClass: {    btn: "w-fit min-w-[2rem] h-fit min-h-[2rem] p-2 rounded bg-gray-200",    active: "bg-gray-400",    hover: "bg-gray-300",    focus: "ring-2 ring-gray-100",    badge: [      "w-0 h-0 rounded-tr border-solid border-[6px] border-transparent border-t-blue-400 border-r-blue-400",    ],    slotBadge: [      "min-w-[50%] min-h-min scale-75 origin-top-right text-gray-600",    ],  },  childrenContainerClass:    "min-w-full w-max flex gap-1 p-1 border border-solid border-gray-400 rounded-md bg-gray-100",  childButtonClass: {},  childrenContainerOffset: {    alignmentAxis: 0,    mainAxis: 2,  },};

Classes in config

There are many classes in VirtualKeyboardConfig, and by default they are in a tailwindcss format.

The type of a class is a ClassName which actually is a string or string[]. The difference between string and string[] is the merge strategy: when a component merging the parent component provided config and its own config, the component will use just the class if it is a string, or merge it with the config of its parent if it is a string[].

For example:

<VirtualKeyboard  :config="{    buttonClass: {      btn: 'p-2 bg-gray-200'    }  }">  <KeyButton    value="t"    :config="{      buttonClass: {        btn: 'm-2 bg-gray-300'      }    }"  /></VirtualKeyboard>

Then the KeyButton will has a class 'm-2 bg-gray-300'.

<VirtualKeyboard  :config="{    buttonClass: {      btn: 'p-2 bg-gray-200'    }  }">  <KeyButton    value="t"    :config="{      buttonClass: {        btn: ['m-2 bg-gray-300']      }    }"  /></VirtualKeyboard>

In this situation the KeyButton will has a class 'p-2 m-2 bg-gray-300'. (Here tailwind-merge is used to merge tailwindcss classes.)

Class Keys

Class Key Component Description
pageClass KeyboardPage
buttonClass KeyButton, PageButton, ShiftButton ButtonClass & HasBadgeClass
childrenContainerClass KeyButton, PageButton
childButtonClass KeyButton, PageButton ButtonClass

ButtonClass Type

The values of buttonClass and childButtonClass are an object (with the type ButtonClass) describing the classes of buttons. Different sub keys are used in different scenarios. If the childButtonClass is not set, the component will use the value of the buttonClass for the children button elements.

Sub Key Scenario
btn the default scenario
hover when the mouse is over the button
focus when the button is focused
active when the button is clicking down by the mouse, or is touching

HasBadgeClass Type

The value of buttonClass is also with the type HasBadgeClass which describes the badge of the button. The default class of the badge will always has "absolute top-0 right-0", so if you do not want to overwrite it, use string[] as the default config.

Sub Key Scenario
badge when the badge has no slots
slotBadge when the badge has a slot

Floating UI and childrenContainerOffset

VirtualKeyboard uses Floating UI to show the children elements of a button, so there is a childrenContainerOffset key in the config to set the position of the floating elements. Its value will send to the offset Middleware of Floating UI as the params.


There are 5 main Vue componenets: VirtualKeyboard, KeyButton, KeyboardPage, PageButton and ShiftButton.

VirtualKeyboard acts as a root component so you have to put the other components in it. You should add key-pressed listener to it and other components will not emit any events(they use Vue project/inject to communicate with each other.).

KeyButton acts as a common button.

The other 3 components are all optional, you can use them in your case.

Component VirtualKeyboard


Prop Type Default Description
config VirtualKeyboardConfig undefined The common config of current keyboard. Every child components will use it as default config . A default config will be used if it is set to undefined


Event payloads Description
key-pressed (key: string) This event will be emitted a key (which is a child of the VirtualKeyboard ) is pressed


VirtualKeyboard has only a default slot. You should put all the children components in it.

Classes & Styles

Just use class & style attribute.

Component KeyButton


Prop Type Default Description
value string required This value will be emitted in the key-pressed event of VirtualKeyboard. And it will be set as the label if the label is “” and the slot (#btn-${value}) is not set.
label string “” The label of this key button.
children (string|ButtonType)[] [] The children buttons of this key button. The label strategy is just like the KeyButton.
shiftIndex number 0 When the VirtualKeyboard is shifted, the children[shiftIndex] will replace the current key button.
active boolean false The class will be add to the button element if this prop is true.
badge "auto"|"hide"|"triangle"|"slot" "auto" The badge is a symbol on the right-top of the KeyButton, and it will be visible if badge !== "hide" and the KeyButton has at least one child.- "triangle" will add config.buttonClass.badge to the badge of the key button; – "slot" will add config.buttonClass.badgeSlot; – "auto" will add config.buttonClass.badgeSlot if there are only one child, or add config.buttonClass.badge if there are more than one child; – "hide" will hide the badge.
config VirtualKeyboardConfig undefined The config of this KeyButton. It will be merged with any provided config by parent components.


Use the default slot for the default value and the named slot (as btn-${child}) for the children if you want to show an icon or something else on the button or the child button.

For example:

<KeyButton value="u" :children="['ǖ', 'ǘ', { value: 'ǚ', label: 'letter ǚ'}, 'ǜ']" >  <template>letter u</template>  <template #btn-ǘ>letter ǘ</template>  <template #[`btn-ǜ`]>letter ǜ</template></KeyButton>

Classes & Styles

You can use class & style (includes :class & :style) on the KeyButton component, however it is difficult to set the children elements, so I recommend you to use config.buttonClass, config.childrenContainerClass and config.childButtonClass to set the class of KeyButton. The tailwindcss is used in this lib, so it is also recommended to use it when you want to set the class.

Component KeyboardPage

You should use this component when your virtual keyboard has multiple layouts (or pages). Each KeyboardPage has a prop named name, and it will be visible when the current page of its parent VirtualKeyboard equals to this prop (which means that you can have multiple KeyboardPage with the same name, and they will be all visible if the current page of VirtualKeyboard equals to it).


Prop Type Default Description
name string required The name of this page.
default boolean false Set it to true if the KeyboardPage should be visible as default page.
pageClass string|string[] “” The HTML class of the KeyboardPage root element. It will be merged with config.pageClass.
config VirtualKeyboardConfig undefined The config of this KeyboardPage. It will be merged with any provided config by parent components.


KeyboardPage has only a default slot. You should put all the children components in it.

Classes & Styles

The same as the classes & styles of KeyButton components, except the KeyboardPage uses config.pageClass instead of config.buttonClass. And furthermore you can use the prop pageClass.

Component PageButton

VirtualKeyboard provides a changePage function (with the type ChangePageFunction) for its children components using provide/inject of Vue, and PageButton will call this function if it is pressed.

PageButton will automatically set the button to active when the current page of VirutalKeyboard equals to its name, and it will also show the correct label (or slot) of the current page.


The props of PageButton are almost the same as KeyButton, except PageButton does not have props active and shiftIndex.


The same as KeyButton.

Classes & Styles

The same as KeyButton.

Component ShiftButton

As the same of PageButton, VirtualKeyboard provides a shiftKeyboard function (with the type ShiftKeyboardFunction)and ShiftButton will call this function if it is pressed.


Prop Type Default Description
label string “Shift” The label of the shift button.
config VirtualKeyboardConfig undefined The config of this ShiftButton. It will be merged with any provided config by parent components.


ShiftButton has only a default slot which is scoped. It can be used to show icons or something else.

Scoped Prop Type Description
isShifted boolean whether the VirtualKeyboard is shifted

Classes & Styles

The same as KeyButton except ShiftButton does not have children buttons.


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