bootstrap-input-spinner

A Bootstrap 5 extension to create input spinner elements for number input. Zero dependencies other than Bootstrap 5 — no jQuery required since v5.0.0.

Unofficial third-party component — bootstrap-input-spinner is maintained by shaack.com and is not affiliated with or endorsed by the Bootstrap team.

Note: bootstrap-input-spinner is now an ES6 module. The legacy ES5 version has been removed; if you still need it, pin to npm 3.x. If you still need jQuery integration, pin to 4.x.

Examples with floating-point and german localization

References

• Demo page with usage examples
• GitHub repository
• npm package

Older version, Bootstrap 4 compatible

The current version is compatible with Bootstrap 5. A Bootstrap 4 compatible version lives on the bootstrap4-compatible branch. npm package versions 3.x, 4.x and 5.x are Bootstrap 5 compatible; 2.x is Bootstrap 4 compatible.

• Bootstrap 4 compatible npm package

Features

The Bootstrap InputSpinner

• is mobile friendly and responsive,
• automatically changes the value when holding a button,
• has internationalized number formatting,
• allows setting a prefix or a suffix text in the input,
• dynamically handles changing attribute values like disabled or class,
• supports templates and custom editors,
• dispatches change and input events on value change like the native element, and
• works without extra css, only Bootstrap 5 is needed.

Quickstart

Installation

Current version, Bootstrap 5 compatible

npm install bootstrap-input-spinner

Bootstrap 4 compatible version

npm install bootstrap-input-spinner@2.2.0

Or just download the GitHub repository and import src/InputSpinner.js as an ES module.

HTML

Create the element in HTML. The attributes are compatible to the native input[type="number"] element.

<input type="number" value="50" min="0" max="100" step="10"/>

Script

<script type="module">
    import {InputSpinner} from "./src/InputSpinner.js"

    const inputSpinnerElements = document.querySelectorAll("input[type='number']")
    for (const inputSpinnerElement of inputSpinnerElements) {
        new InputSpinner(inputSpinnerElement)
    }
</script>

That's it. No extra css needed, just Bootstrap 5.

API Reference

HTML Attributes

<input type="number" value="4.5" min="0" max="9" step="0.1" data-decimals="2" data-suffix="°C"/>

Use these attributes to configure the behaviour

• value // starting value on element creation
• min // minimum value when stepping
• max // maximum value when stepping
• step // step size
• inputmode // the "inputmode" of the input, defaults to "decimal" (shows decimal keyboard on touch devices)
• data-decimals // shown decimal places
• data-digit-grouping // "false" to disable grouping (thousands separator), default is "true"
• data-prefix // show a prefix text in the input element
• data-suffix // show a suffix text in the input element

The InputSpinner also handles the standard input attributes required, disabled, readonly and placeholder.

Create an instance in JavaScript

Instantiate the InputSpinner class on any <input type="number"> element. You may provide additional configuration in an object as a second parameter.

import {InputSpinner} from "bootstrap-input-spinner/src/InputSpinner.js"

new InputSpinner(element, config)

Configuration (props)

The default configuration is

const props = {
    decrementButton: "<strong>&minus;</strong>", // button text
    incrementButton: "<strong>&plus;</strong>", // ..
    groupClass: "", // css class of the resulting input-group
    buttonsClass: "btn-outline-secondary",
    buttonsWidth: "2.5rem",
    textAlign: "center", // alignment of the entered number
    autoDelay: 500, // ms threshold before auto value change
    autoInterval: 50, // speed of auto value change, set to `undefined` to disable auto-change
    buttonsOnly: false, // set this `true` to disable the possibility to enter or paste the number via keyboard
    keyboardStepping: true, // set this to `false` to disallow the use of the up and down arrow keys to step
    mouseWheel: false, // set to `true` to step the value on mouse wheel when the input is focused
    locale: navigator.language, // the locale, per default detected automatically from the browser
    editor: I18nEditor, // the editor (parsing and rendering of the input)
    template: // the template of the input
        '<div class="input-group ${groupClass}">' +
        '<button style="min-width: ${buttonsWidth}" class="btn btn-decrement ${buttonsClass} btn-minus" type="button">${decrementButton}</button>' +
        '<input type="text" inputmode="decimal" style="text-align: ${textAlign}" class="form-control form-control-text-input"/>' +
        '<button style="min-width: ${buttonsWidth}" class="btn btn-increment ${buttonsClass} btn-plus" type="button">${incrementButton}</button>' +
        '</div>'
}

decrementButton, incrementButton

HTML of the texts inside the buttons.

groupClass

Additional css class for the input-group of the rendered Bootstrap input.

buttonsClass

The css class of the buttons. Use it to style the increment and decrement buttons as described in the Bootstrap 5 button docs. For example buttonsClass: "btn-primary" or "btn-success".

buttonsWidth

The width of the increment and decrement buttons.

textAlign

The text alignment inside the <input>.

autoDelay

The delay in ms after which the input automatically changes the value, when holding the increment or decrement button.

autoInterval

Speed of the value change when holding the button in ms. A lower value makes it faster.

buttonsOnly

In buttonsOnly mode (set true) no direct text input is allowed, the text-input gets the attribute readonly, but the plus and minus buttons still allow to change the value.

keyboardStepping

In keyboardStepping mode (set true) allows the use of the up/down arrow keys to increase/decrease the number by the step.

mouseWheel

Off by default, matching modern browsers which no longer wheel-step native <input type="number"> elements. Set to true to enable mouse-wheel stepping. The wheel listener is only attached while the input has focus, so an unfocused spinner never hijacks page scroll. Scroll up increases the value, scroll down decreases it.

locale

Used to format the number in the UI. Detected automatically from the user's browser, can be set to "de", "en",… or " de_DE", "en_GB",….

editor

An Editor defines how the input is parsed and rendered. The default editor is the internal I18nEditor, which parses and renders an internationalized number. Additional editors live in src/custom-editors.js and are available as named ES exports:

import {RawEditor, TimeEditor} from "bootstrap-input-spinner/src/custom-editors.js"

new InputSpinner(element, {editor: TimeEditor})

An Editor must implement two functions: parse(customFormat) to turn the input string into a number, and render(number) to format the number back for display.

The simplest custom Editor is the RawEditor, which renders and parses the value without any changes, like a native number input. It looks like this:

export const RawEditor = function (props, element) {
    this.parse = function (customFormat) {
        // parse nothing
        return customFormat
    }
    this.render = function (number) {
        // render raw
        return number
    }
}

props is the configuration of the spinner and element is the original HTML element. You can use these values for the configuration of the Editor, like in I18nEditor, which uses props for the language and element for the attributes.

The TimeEditor renders and parses the number to time in hours and minutes, separated by a colon.

Supports custom editors to parse and render everything

template

To modify the look completely, you can use the template parameter. There is an example about this on the Demo Page.

Programmatic change and read of value

Read via element.value, write via element.setValue(newValue):

const currentValue = element.value       // read
element.setValue(newValue)                // write

Writing directly with element.value = 5 bypasses the editor rendering, so always use setValue to update the spinner value programmatically.

Handling attributes

The attributes min, max, step, decimals, placeholder, required, disabled, readonly and class are handled dynamically. The class attribute value is dynamically copied to the input element.

Sizing

If the original elements class is set to form-control-sm of form-control-lg the class of the resulting input-group is dynamically set to input-group-sm or input-group-lg.

Events

The InputSpinner dispatches native input and change events on the original element, just like a native number input.

element.addEventListener("change", function (event) {
    const newValue = event.target.value
})

Methods

destroy

Removes the InputSpinner and shows the original input element.

element.destroyInputSpinner()

Minified version

I don't provide a minified version because I think it should be up to the using programmer to create minified versions, with all the used script sources concatenated to one file.

But, if you want it, it is easy to create your minified version with uglify: https://www.npmjs.com/package/uglify-js

Just install uglify

npm install uglify-js -g

and then in the src folder

uglifyjs InputSpinner.js --compress --mangle > InputSpinner.min.js

Violà! :)

Testing

There is a Teevi based browser test suite under test/. Serve the repo with any static server and open test/index.html in a browser to run it:

npx http-server -p 8080
# then open http://localhost:8080/test/

Browser support

The spinner works in all modern browsers that support ES modules.

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