From 38ec7c4df7a04b6942516669edb9517c9035dc1d Mon Sep 17 00:00:00 2001
From: XhmikosR <xhmikosr@gmail.com>
Date: Wed, 13 May 2020 22:36:00 +0300
Subject: Bump version to 5.0.0-alpha1 (#29925)

Also add v4.5.0 in versions and keep README.md pointing to v4.5.0 so that there are no broken stuff.
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+---
+layout: docs
+title: JavaScript
+description: Bring Bootstrap to life with our optional JavaScript plugins. Learn about each plugin, our data and programmatic API options, and more.
+group: getting-started
+toc: true
+---
+
+## Individual or compiled
+
+Plugins can be included individually (using Bootstrap's individual `js/dist/*.js`), or all at once using `bootstrap.js` or the minified `bootstrap.min.js` (don't include both).
+
+If you use a bundler (Webpack, Rollup...), you can use `/js/dist/*.js` files which are UMD ready.
+
+## Using Bootstrap as a module
+
+We provide a version of Bootstrap built as `ESM` (`bootstrap.esm.js` and `bootstrap.esm.min.js`) which allows you to use Bootstrap as a module in your browser, if your [targeted browsers support it](https://caniuse.com/#feat=es6-module).
+
+{{< highlight html >}}
+<script type="module">
+  import { Toast } from 'bootstrap.esm.min.js'
+
+  Array.from(document.querySelectorAll('.toast'))
+    .forEach(toastNode => new Toast(toastNode))
+</script>
+{{< /highlight >}}
+
+{{< callout warning >}}
+## Incompatible plugins
+
+Due to browser limitations, some of our plugins, namely Dropdown, Tooltip and Popover plugins, cannot be used in a `<script>` tag with `module` type because they depend on Popper.js. For more information about the issue see [here](https://v8.dev/features/modules#specifiers).
+{{< /callout >}}
+
+## 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.js](https://popper.js.org/).
+
+## Still want to use jQuery? It's possible!
+
+Bootstrap 5 is designed to be used without jQuery, but it's still possible to use our components with jQuery. **If Bootstrap detects `jQuery` in the `window` object** it'll add all of our components in jQuery's plugin system; this means you'll be able to do `$('[data-toggle="tooltip"]').tooltip()` to enable tooltips. The same goes for our other components.
+
+## Data attributes
+
+Nearly all 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.)
+
+{{< callout warning >}}
+## Selectors
+
+Currently to query DOM elements we use the native methods `querySelector` and `querySelectorAll` for performance reasons, so you have to use [valid selectors](https://www.w3.org/TR/CSS21/syndata.html#value-def-identifier).
+If you use special selectors, for example: `collapse:Example` be sure to escape them.
+{{< /callout >}}
+
+## Events
+
+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()`](https://developer.mozilla.org/en-US/docs/Web/API/Event/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()`.
+
+{{< highlight js >}}
+var myModal = document.getElementById('myModal')
+
+myModal.addEventListener('show.bs.modal', function (e) {
+  if (!data) {
+    return e.preventDefault() // stops modal from being shown
+  }
+})
+{{< /highlight >}}
+
+{{< callout warning >}}
+## jQuery events
+
+Bootstrap will detect jQuery if `jQuery` is present in the `window` object and there is no `data-no-jquery` attribute set on `<body>`. If jQuery is found, Bootstrap will emit events thanks to jQuery's event system. So if you want to listen to Bootstrap's events, you'll have to use the jQuery methods (`.on`, `.one`) instead of `addEventListener`.
+
+{{< highlight js >}}
+$('#myTab a').on('shown.bs.tab', function () {
+  // do something...
+})
+{{< /highlight >}}
+{{< /callout >}}
+
+## Programmatic API
+
+All constructors accept an optional options object or nothing (which initiates a plugin with its default behavior):
+
+{{< highlight js >}}
+var myModalEl = document.getElementById('myModal')
+
+var modal = new bootstrap.Modal(myModalEl) // initialized with defaults
+var modal = new bootstrap.Modal(myModalEl, { keyboard: false }) // initialized with no keyboard
+{{< /highlight >}}
+
+If you'd like to get a particular plugin instance, each plugin exposes a `getInstance` method. In order to retrieve it directly from an element, do this: `bootstrap.Popover.getInstance(myPopoverEl)`.
+
+### 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.
+
+{{< highlight js >}}
+var myCollapseEl = document.getElementById('#myCollapse')
+
+myCollapseEl.addEventListener('shown.bs.collapse', function (e) {
+  // Action to execute once the collapsible area is expanded
+})
+{{< /highlight >}}
+
+In addition a method call on a **transitioning component will be ignored**.
+
+{{< highlight js >}}
+var myCarouselEl = document.getElementById('myCarousel')
+var carousel = bootstrap.Carousel.getInstance(myCarouselEl) // Retrieve a Carousel instance
+
+myCarouselEl.addEventListener('slid.bs.carousel', function (e) {
+  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 !!
+{{< /highlight >}}
+
+### Default settings
+
+You can change the default settings for a plugin by modifying the plugin's `Constructor.Default` object:
+
+{{< highlight js >}}
+// changes default for the modal plugin's `keyboard` option to false
+bootstrap.Modal.Default.keyboard = false
+{{< /highlight >}}
+
+## No conflict (only if you use jQuery)
+
+Sometimes it is necessary to use 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.
+
+{{< highlight js >}}
+var bootstrapButton = $.fn.button.noConflict() // return $.fn.button to previously assigned value
+$.fn.bootstrapBtn = bootstrapButton // give $().bootstrapBtn the Bootstrap functionality
+{{< /highlight >}}
+
+## Version numbers
+
+The version of each of Bootstrap's plugins can be accessed via the `VERSION` property of the plugin's constructor. For example, for the tooltip plugin:
+
+{{< highlight js >}}
+bootstrap.Tooltip.VERSION // => "{{< param current_version >}}"
+{{< /highlight >}}
+
+## No special fallbacks when JavaScript is disabled
+
+Bootstrap's plugins don't fall back particularly gracefully when JavaScript is disabled. If you care about the user experience in this case, use [`<noscript>`](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/noscript) to explain the situation (and how to re-enable JavaScript) to your users, and/or add your own custom fallbacks.
+
+{{< callout warning >}}
+##### Third-party libraries
+
+**Bootstrap does not officially support third-party JavaScript libraries** like Prototype or jQuery UI. Despite `.noConflict` and namespaced events, there may be compatibility problems that you need to fix on your own.
+{{< /callout >}}
+
+## Sanitizer
+
+Tooltips and Popovers use our built-in sanitizer to sanitize options which accept HTML.
+
+The default `whiteList` value is the following:
+
+{{< highlight js >}}
+var ARIA_ATTRIBUTE_PATTERN = /^aria-[\w-]*$/i
+var DefaultWhitelist = {
+  // 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: []
+}
+{{< /highlight >}}
+
+If you want to add new values to this default `whiteList` you can do the following:
+
+{{< highlight js >}}
+var myDefaultWhiteList = bootstrap.Tooltip.Default.whiteList
+
+// To allow table elements
+myDefaultWhiteList.table = []
+
+// To allow td elements and data-option attributes on td elements
+myDefaultWhiteList.td = ['data-option']
+
+// You can push your custom regex to validate your attributes.
+// Be careful about your regular expressions being too lax
+var myCustomRegex = /^data-my-app-[\w-]+/
+myDefaultWhiteList['*'].push(myCustomRegex)
+{{< /highlight >}}
+
+If you want to bypass our sanitizer because you prefer to use a dedicated library, for example [DOMPurify](https://www.npmjs.com/package/dompurify), you should do the following:
+
+{{< highlight js >}}
+var yourTooltipEl = document.getElementById('yourTooltip')
+var tooltip = new bootstrap.Tooltip(yourTooltipEl, {
+  sanitizeFn: function (content) {
+    return DOMPurify.sanitize(content)
+  }
+})
+{{< /highlight >}}
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