Numeric Keyboard

A custom virtual numeric keyboard works in mobile browsers. It contains a virtual input box which would invoke the numeric keyboard instead of system keyboard, the virtual input box supports many html5 standard properties and also has a nice cursor to make it behaves like native input element as much as possible. Besides, the numeric keyboard is a pluggable component can be used together with other input interfaces.

The numeric keyboard is created respectively for Vanilla JavaScript, React, Angular and Vue.

for React, Angular and Vue, only the latest version is supported.

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Table of contents

• Install
• Usage
• Keyboard
• Contributing
• License

Install

You can install it via Yarn

yarn add numeric-keyboard

Config Webpack to use the right version

resolve: {
  alias: {
    // use Vue component for example
    'numeric-keyboard$': 'numeric-keyboard/dist/numeric_keyboard.vue.js'
  }
},

Usage

Vanilla JavaScript

import { NumericInput } from 'numeric-keyboard'
new NumericInput({
  type: 'number',
  placeholder: 'touch to input',
  onInput(value) {
    ...
  }
}).mount('.input')

React

import { NumericInput } from 'numeric-keyboard'
class App extends React.Component {
  input(val) {
    ...
  },
  render() {
    return <div className="input">
      <label>Amount: </label>
      <NumericInput type="number" placeholder="touch to input" onInput={this.input.bind(this)} />
    </div>
  }
}

Angular

import { Component } from '@angular/core';
@Component({
  selector: 'app-root',
  template: `
    <div className="input">
      <label>Amount: </label>
      <numeric-input type="number" placeholder="touch to input" [(ngModel)]="amount"></numeric-input>
    </div>
  `,
})
export class AppComponent {
  public amount: number | string = ''
}

Vue

<template>
  <div class="input">
    <label>Amount: </label>
    <NumericInput placeholder="touch to input" v-model="amount" />
  </div>
</template>

<script>
  import { NumericInput } from 'numeric-keyboard'
  export default {
    components: {
      NumericInput
    },
    data() {
      return {
        amount: ''
      }
    }
  }
</script>

Options/Props

As a substitute for native input element, the input box supports most of the standard attributes, you can refer the HTML spec for details.

// There are only two types: number and tel, the corresponding layout of keyboard would be invoked by default.
type: {
  type:String,
  default: 'number'
},
autofocus: {
  type: Boolean,
  default: false
},
disabled: {
  type: Boolean,
  default: false
},
maxlength: {
  type: Number
},
name: {
  type: String
},
placeholder: {
  type: String
},
readonly: {
  type: Boolean,
  default: false
},
value: {
  type: [String, Number]
},
// Passs a regexp string or function to limit the input.
format: {
  type: [String, Function]
},
// change the layout of keyboard
layout: {
 type: [String, Array],
 default: 'number'
},
// change the label of keyboard enter key, use iconfont for icon.
entertext: {
 type: String,
 default: 'enter'
}

Callback/Events

input

The input event is emitted when the value of input changes. The first argument for the callback is the value of the input box rather than an event object from a native input element. A onInput() callback is used in vanilla javascript version.

enterpress

The enterpress event is emitted when the enter key of keyboard is pressed.

Keyboard

The keyboard is a pluggable component which supports custom layout. In order to be able to work properly in a real scene, it usually needs to match an output interface.

Usage

Vanilla JavaScript

import { NumericKeyboard } from 'numeric-keyboard'
new NumericKeyboard('.keyboard', {
  layout: 'tel',
  onPress(key) {
    ...
  }
})

React

import { NumericKeyboard } from 'numeric-keyboard'
class App extends React.Component {
  press(key) {
    ...
  }
  render() {
    return <div className="keyboard">
      <NumericKeyboard layout="tel" onPress={this.press.bind(this)} />
    </div>
  }
}

Angular

import { Component } from '@angular/core';
@Component({
  selector: 'app-root',
  template: `
    <div class="keyboard">
      <numeric-keyboard layout="tel" (onPress)="press($event)"></numeric-keyboard>
    </div>
  `,
})
export class AppComponent {
  press(key) {
    ...
  }
}

Vue

<template>
   <div class="keyboard">
     <NumericKeyboard layout="tel" @press="press" />
   </div>
</template>

<script>
  import { NumericKeyboard } from 'numeric-keyboard'
  export default {
    components: {
      NumericKeyboard
    },
    methods: {
      press(key) {
        ...
      }
    }
  }
</script>

Options/Props

// change the layout of keyboard
layout: {
 type: [String, Array],
 default: 'number'
},
// change the label of keyboard enter key, use iconfont for icon.
entertext: {
 type: String,
 default: 'enter'
}

layout

There are two built-in layouts called number and tel which can be used as a replacement of system keyboard. You can still rearrange all the keys to create your own layout. The layout object is a two-dimension array which constructs a table layout, you can make table-specific operations like merging cells.

number layout

tel layout

custom layout

// code sample for the build-in number layout
import { keys } from 'numeric-keyboard'
[
  [
    {
      key: keys.ONE
    },
    {
      key: keys.TWO
    },
    {
      key: keys.THREE
    },
    {
      key: keys.DEL,
      rowspan: 2,
    },
  ],
  [
    {
      key: keys.FOUR
    },
    {
      key: keys.FIVE
    },
    {
      key: keys.SIX
    },
  ],
  [
    {
      key: keys.SEVEN
    },
    {
      key: keys.EIGHT
    },
    {
      key: keys.NINE
    },
    {
      key: keys.ENTER,
      rowspan: 2,
    },
  ],
  [
    {
      key: keys.DOT
    },
    {
      key: keys.ZERO
    },
    {
      key: keys.ESC
    },
  ],
]

Callbacks/Events

press

the press event is emitted with a key code when the key is pressed. The argument for the callback is the key just pressed. A onPress() callback is used in vanilla javascript version.

enterpress

The enterpress event is emitted when the enter key of keyboard is pressed.

Contributing

Welcome to contributing, the guidelines are being drafted.

License

Licensed under the MIT license.