Pads—lightweight and dependency-free on-screen keyboards

Out of the box the package contains three keyboards: a plain dial pad, an email keyboard and a simple one for name fields. Of course one can add custom keyboards and layouts, along with the methods for their function and modifier keys. All fields having the pad-field class will be linked to the keyboard. Each field's type (or data-pad) attribute defines the layout of the keyboard.
This is mostly written in ES5 as it was originally coded for touch platforms running older Android browsers. The ES6 parts were either supported by the devices or needed to concatenate the modules with Rollup.
›_ demo

Features

• Each keyboard can have multiple layouts
• A single event listener is bound to the keyboard for all keys in all layouts
• All keys can have a custom click event handler
• The keyboard is linked to a field, and adapt its layout, once the field is in focus
• Ability to cycle through the fields (eg. on enter set the focus on the next field)
• Labelling of non-alphanumeric keys

Installation with npm

npm i @brightfish/pads

Usage

new Pad({
    root: document.querySelector('.insert-pad-here'),
});

Options

• root null|string|Element Where to render the keyboard; if omitted the keyboard is appended after the first field. Default: null
• field null|string|HTMLInputElement Field to bind the keyboard to; optional: all fields with .pad-field are eligible. Default: null
• keyboard string Starting keyboard. Default: 'email'
• layout string Starting layout (of the default keyboard). Default: 'normal'

Listening to events & validation

(new Pad({...}))
    .on('update', value => {
        return value.length < 10
    })
    .on('b', value => {
        console.log("'b' key was pressed; current field value is", value)
        return true;
    })
    .on('enter', function(value) {
        this.next(); // jump to the next field
        return true;
    })

Defining custom keyboards

let layouts = {
        alpha: [
            ['a', 'b', 'c', 'custom1'],
            ['caps', 'x', 'y', 'z', 'num'],
            ['.(period)', '-(hyphen)', ' (space)']
        ],
        num: [
            [1, 2, 3, 'f3'],
            [7, 8, 9, 'backspace', 'alpha']
        ]
    },
    methods = {
        custom1() {
            alert('alert')
        },
        f3() {
            console.log('funky')
        },
    }

Pad.addKeyboard('my-keyboard', layouts, methods);

Key styling and textContent

Character keys have their key values as textContent, while modifier keys have none and need to be styled through css (which allows for custom icons), for example: .pad-key-enter:after { content: '\21B5' } for '↵'

Main public methods

instance.on(event, fn): instance

Listen to the update event or any key press (pass in the key value)

instance.switchField(field, keyboard, layout): instance

Switch to another field having the pad-field class name, and optionally change the keyboard and layout. The layout argument will take precedence over the type and data-pad attributes of the field.

instance.getField(): HTMLInputElement

Return the input field the instance is currently linked to

instance.next(): void

Jump to the next .pad-field field

instance.getFieldValue(): String

Get the value of the current field

instance.setFieldValue(string): void

Set the value of the current field

instance.clear(): void

Clear the current field's value

instance.show(): void

Show the keyboard

instance.hide(): void

Hide the keyboard

instance.destroy(boolean): void

Unbind all events and clean up the DOM, optionally empty out the field

License

GNU General Public License (GPL). Please see License File for more information.