JavaScript

Bring CoreUI for Bootstrap to life with our optional JavaScript plugins. Learn about each plugin, our data and programmatic API options, and more.

On this page

Individual or compiled

Plugins can be included individually (using CoreUI’s individual js/dist/*.js), or all at once using coreui.js or the minified coreui.min.js (don’t include both).

If you use a bundler (Webpack, Rollup…), you can use /js/dist/*.js files which are UMD ready.

Usage with JavaScript frameworks

Using CoreUI for Bootstrap as a module

We provide a version of CoreUI for Bootstrap built as ESM (coreui.esm.js and coreui.esm.min.js) which allows you to use CoreUI for Bootstrap as a module in your browser, if your targeted browsers support it.

<script type="module">
  import { Toast } from 'coreui.esm.min.js'

  Array.from(document.querySelectorAll('.toast'))
    .forEach(toastNode => new Toast(toastNode))
</script>

Compared to JS bundlers, using ESM in the browser requires you to use the full path and filename instead of the module name. Read more about JS modules in the browser. That’s why we use 'coreui.esm.min.js' instead of 'coreui' above. However, this is further complicated by our Popper dependency, which imports Popper into our JavaScript like so:

import * as Popper from "@popperjs/core"

If you try this as-is, you’ll see an error in the console like the following:

Uncaught TypeError: Failed to resolve module specifier "@popperjs/core". Relative references must start with either "/", "./", or "../".

To fix this, you can use an importmap to resolve the arbitrary module names to complete paths. If your targeted browsers do not support importmap, you’ll need to use the es-module-shims project. Here’s how it works for Bootstrap and Popper:

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="https://cdn.jsdelivr.net/npm/@coreui/coreui@4.3.2/dist/css/coreui.min.css" rel="stylesheet" integrity="sha384-H8oVKJOQVGGCdfFNM+9gLKN0xagtq9oiNLirmijheEuqD3kItTbTvoOGgxVKqNiB" crossorigin="anonymous">
    <title>Hello, modularity!</title>
  </head>
  <body>
    <h1>Hello, modularity!</h1>
    <button id="popoverButton" type="button" class="btn btn-primary btn-lg" data-coreui-toggle="popover" title="ESM in Browser" data-coreui-content="Bang!">Custom popover</button>

    <script async src="https://cdn.jsdelivr.net/npm/es-module-shims@1/dist/es-module-shims.min.js" crossorigin="anonymous"></script>
    <script type="importmap">
    {
      "imports": {
        "@popperjs/core": "https://cdn.jsdelivr.net/npm/@popperjs/core@2.11.8/dist/esm/popper.min.js",
        "coreui": "https://cdn.jsdelivr.net/npm/coreui@4.3.2/dist/js/coreui.esm.min.js"
      }
    }
    </script>
    <script type="module">
      import * as coreui from '@coreui/coreui'

      new coreui.Popover(document.getElementById('popoverButton'))
    </script>
  </body>
</html>

Dependencies

Some plugins and CSS components depend on other plugins. If you include plugins individually, make sure to check for these dependencies in the docs.

Our dropdowns, popovers and tooltips also depend on Popper.

Data attributes

Nearly all CoreUI for Bootstrap plugins can be enabled and configured through HTML alone with data attributes (our preferred way of using JavaScript functionality). Be sure to only use one set of data attributes on a single element (e.g., you cannot trigger a tooltip and modal from the same button.)

Selectors

Currently to query DOM elements we use the native methods querySelector and querySelectorAll for performance reasons, so you have to use valid selectors. If you use special selectors, for example: collapse:Example be sure to escape them.

Events

CoreUI for Bootstrap provides custom events for most plugins’ unique actions. Generally, these come in an infinitive and past participle form - where the infinitive (ex. show) is triggered at the start of an event, and its past participle form (ex. shown) is triggered on the completion of an action.

All infinitive events provide preventDefault() functionality. This provides the ability to stop the execution of an action before it starts. Returning false from an event handler will also automatically call preventDefault().

const myModal = document.getElementById('myModal')

myModal.addEventListener('show.coreui.modal', event => {
  return event.preventDefault() // stops modal from being shown
})

Programmatic API

All constructors accept an optional options object or nothing (which initiates a plugin with its default behavior):

const myModalEl = document.querySelector('#myModal')
const modal = new coreui.Modal(myModalEl) // initialized with defaults

const configObject = { keyboard: false }
const modal1 = new coreui.Modal(myModalEl, configObject) // initialized with no keyboard

If you’d like to get a particular plugin instance, each plugin exposes a getInstance method. For example, to retrieve an instance directly from an element:

coreui.Popover.getInstance(myPopoverEl)

This method will return null if an instance is not initiated over the requested element.

Alternatively, getOrCreateInstance can be used to get the instance associated with a DOM element, or create a new one in case it wasn’t initialized.

coreui.Popover.getOrCreateInstance(myPopoverEl, configObject)

In case an instance wasn’t initialized, it may accept and use an optional configuration object as second argument.

CSS selectors in constructors

In addition to the getInstance and getOrCreateInstance methods, all plugin constructors can accept a DOM element or a valid CSS selector as the first argument. Plugin elements are found with the querySelector method since our plugins only support a single element.

const modal = new coreui.Modal('#myModal')
const dropdown = new coreui.Dropdown('[data-coreui-toggle="dropdown"]')
const offcanvas = coreui.Offcanvas.getInstance('#myOffcanvas')
const alert = coreui.Alert.getOrCreateInstance('#myAlert')

Asynchronous functions and transitions

All programmatic API methods are asynchronous and return to the caller once the transition is started but before it ends.

In order to execute an action once the transition is complete, you can listen to the corresponding event.

const myCollapseEl = document.getElementById('myCollapse')

myCollapseEl.addEventListener('shown.coreui.collapse', event => {
  // Action to execute once the collapsible area is expanded
})

In addition a method call on a transitioning component will be ignored.

const myCarouselEl = document.getElementById('myCarousel')
const carousel = coreui.Carousel.getInstance(myCarouselEl) // Retrieve a Carousel instance

myCarouselEl.addEventListener('slid.coreui.carousel', event => {
  carousel.to('2') // Will slide to the slide 2 as soon as the transition to slide 1 is finished
})

carousel.to('1') // Will start sliding to the slide 1 and returns to the caller
carousel.to('2') // !! Will be ignored, as the transition to the slide 1 is not finished !!

`dispose` method

While it may seem correct to use the dispose method immediately after hide(), it will lead to incorrect results. Here’s an example of the problem use:

const myModal = document.querySelector('#myModal')
myModal.hide() // it is asynchronous

myModal.addEventListener('shown.coreui.hidden', event => {
  myModal.dispose()
})

Default settings

You can change the default settings for a plugin by modifying the plugin’s Constructor.Default object:

// changes default for the modal plugin's `keyboard` option to false
coreui.Modal.Default.keyboard = false

Methods and properties

Every CoreUI for Bootstrap plugin exposes the following methods and static properties.

Method	Description
`dispose`	Destroys an element’s modal. (Removes stored data on the DOM element)
`getInstance`	Static method which allows you to get the modal instance associated with a DOM element.
`getOrCreateInstance`	Static method which allows you to get the modal instance associated with a DOM element, or create a new one in case it wasn’t initialized.

Static property	Description
`NAME`	Returns the plugin name. (Example: `coreui.Tooltip.NAME`)
`VERSION`	The version of each of CoreUI for Bootstrap’s plugins can be accessed via the `VERSION` property of the plugin’s constructor (Example: `coreui.Tooltip.VERSION`)

Sanitizer

Tooltips and Popovers use our built-in sanitizer to sanitize options which accept HTML.

The default allowList value is the following:

js/src/util/sanitizer.js

const ARIA_ATTRIBUTE_PATTERN = /^aria-[\w-]*$/i

export const DefaultAllowlist = {
  // Global attributes allowed on any supplied element below.
  '*': ['class', 'dir', 'id', 'lang', 'role', ARIA_ATTRIBUTE_PATTERN],
  a: ['target', 'href', 'title', 'rel'],
  area: [],
  b: [],
  br: [],
  col: [],
  code: [],
  div: [],
  em: [],
  hr: [],
  h1: [],
  h2: [],
  h3: [],
  h4: [],
  h5: [],
  h6: [],
  i: [],
  img: ['src', 'srcset', 'alt', 'title', 'width', 'height'],
  li: [],
  ol: [],
  p: [],
  pre: [],
  s: [],
  small: [],
  span: [],
  sub: [],
  sup: [],
  strong: [],
  u: [],
  ul: []
}

If you want to add new values to this default allowList you can do the following:

const myDefaultAllowList = coreui.Tooltip.Default.allowList

// To allow table elements
myDefaultAllowList.table = []

// To allow td elements and data-coreui-option attributes on td elements
myDefaultAllowList.td = ['data-coreui-option']

// You can push your custom regex to validate your attributes.
// Be careful about your regular expressions being too lax
const myCustomRegex = /^data-my-app-[\w-]+/
myDefaultAllowList['*'].push(myCustomRegex)

If you want to bypass our sanitizer because you prefer to use a dedicated library, for example DOMPurify, you should do the following:

const yourTooltipEl = document.querySelector('#yourTooltip')
const tooltip = new coreui.Tooltip(yourTooltipEl, {
  sanitizeFn(content) {
    return DOMPurify.sanitize(content)
  }
})

Optionally using jQuery

You don’t need jQuery in CoreUI for Bootstrap, but it’s still possible to use our components with jQuery. If CoreUI for Bootstrap detects jQuery in the window object, it’ll add all of our components in jQuery’s plugin system. This allows you to do the following:

// to enable tooltips with the default configuration
$('[data-coreui-toggle="tooltip"]').tooltip()

// to initialize tooltips with given configuration
$('[data-coreui-toggle="tooltip"]').tooltip({
  boundary: 'clippingParents',
  customClass: 'myClass'
})

// to trigger the `show` method
$('#myTooltip').tooltip('show')

The same goes for our other components.

No conflict

Sometimes it is necessary to use CoreUI for Bootstrap plugins with other UI frameworks. In these circumstances, namespace collisions can occasionally occur. If this happens, you may call .noConflict on the plugin you wish to revert the value of.

const coreuiButton = $.fn.button.noConflict() // return $.fn.button to previously assigned value
$.fn.coreuiBtn = coreuiButton // give $().coreuiBtn the CoreUI for Bootstrap functionality

CoreUI for Bootstrap does not officially support third-party JavaScript libraries like Prototype or jQuery UI. Despite .noConflict and namespaced events, there may be compatibility problems that you need to fix on your own.

jQuery events

CoreUI for Bootstrap will detect jQuery if jQuery is present in the window object and there is no data-coreui-no-jquery attribute set on <body>. If jQuery is found, CoreUI for Bootstrap will emit events thanks to jQuery’s event system. So if you want to listen to CoreUI for Bootstrap’s events, you’ll have to use the jQuery methods (.on, .one) instead of addEventListener.

$('#myTab a').on('shown.coreui.tab', () => {
  // do something...
})

Disabled JavaScript

CoreUI for Bootstrap’s plugins have no special fallback when JavaScript is disabled. If you care about the user experience in this case, use <noscript> to explain the situation (and how to re-enable JavaScript) to your users, and/or add your own custom fallbacks.