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+---
+layout: docs
+title: JavaScript
+description: Bring Bootstrap to life with our optional JavaScript plugins built on jQuery. 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.
+
+## 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. Also note that **all plugins depend on jQuery** (this means jQuery must be included **before** the plugin files). [Consult our `package.json`]({{ site.repo }}/blob/v{{ site.current_version }}/package.json) to see which versions of jQuery are supported.
+
+Our dropdowns, popovers and tooltips also depend on [Popper.js](https://popper.js.org/).
+
+## 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.)
+
+However, in some situations it may be desirable to disable this functionality. To disable the data attribute API, unbind all events on the document namespaced with `data-api` like so:
+
+{% highlight js %}
+$(document).off('.data-api')
+{% endhighlight %}
+
+Alternatively, to target a specific plugin, just include the plugin's name as a namespace along with the data-api namespace like this:
+
+{% highlight js %}
+$(document).off('.alert.data-api')
+{% endhighlight %}
+
+{% capture callout %}
+##### Escaping selectors
+If you use special selectors, for example: `collapse:Example`, be sure to escape them, because they'll be passed through jQuery.
+{% endcapture %}
+{% include callout.html content=callout type="warning" %}
+
+## 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 %}
+$('#myModal').on('show.bs.modal', function (e) {
+  if (!data) return e.preventDefault() // stops modal from being shown
+})
+{% endhighlight %}
+
+## Programmatic API
+
+We also believe you should be able to use all Bootstrap plugins purely through the JavaScript API. All public APIs are single, chainable methods, and return the collection acted upon.
+
+{% highlight js %}
+$('.btn.danger').button('toggle').addClass('fat')
+{% endhighlight %}
+
+All methods should accept an optional options object, a string which targets a particular method, or nothing (which initiates a plugin with default behavior):
+
+{% highlight js %}
+$('#myModal').modal()                      // initialized with defaults
+$('#myModal').modal({ keyboard: false })   // initialized with no keyboard
+$('#myModal').modal('show')                // initializes and invokes show immediately
+{% endhighlight %}
+
+Each plugin also exposes its raw constructor on a `Constructor` property: `$.fn.popover.Constructor`. If you'd like to get a particular plugin instance, retrieve it directly from an element: `$('[rel="popover"]').data('popover')`.
+
+### Asynchronous functions and transitions
+
+All programmatic API methods are **asynchronous** and returns to the caller once the transition is started but **before it ends**.
+
+In order to execute an action once the transition is complete, you can listen to the corresponding event.
+
+{% highlight js %}
+$('#myCollapse').on('shown.bs.collapse', function (e) {
+  // Action to execute once the collapsible area is expanded
+})
+{% endhighlight %}
+
+In addition a method call on a **transitioning component will be ignored**.
+
+{% highlight js %}
+$('#myCarousel').on('slid.bs.carousel', function (e) {
+  $('#myCarousel').carousel('2') // Will slide to the slide 2 as soon as the transition to slide 1 is finished
+})
+
+$('#myCarousel').carousel('1') // Will start sliding to the slide 1 and returns to the caller
+$('#myCarousel').carousel('2') // !! Will be ignored, as the transition to the slide 1 is not finished !!
+{% endhighlight %}
+
+### Default settings
+
+You can change the default settings for a plugin by modifying the plugin's `Constructor.Default` object:
+
+{% highlight js %}
+$.fn.modal.Constructor.Default.keyboard = false // changes default for the modal plugin's `keyboard` option to false
+{% endhighlight %}
+
+## No conflict
+
+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 $().bootstrapBtn the Bootstrap functionality
+{% endhighlight %}
+
+## Version numbers
+
+The version of each of Bootstrap's jQuery plugins can be accessed via the `VERSION` property of the plugin's constructor. For example, for the tooltip plugin:
+
+{% highlight js %}
+$.fn.tooltip.Constructor.VERSION // => "{{ site.current_version }}"
+{% endhighlight %}
+
+## 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.
+
+{% capture callout %}
+##### 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.
+{% endcapture %}
+{% include callout.html content=callout type="warning" %}
+
+## Util
+
+All Bootstrap's JavaScript files depend on `util.js` and it has to be included alongside the other JavaScript files. If you're using the compiled (or minified) `bootstrap.js`, there is no need to include this—it's already there.
+
+`util.js` includes utility functions and a basic helper for `transitionEnd` events as well as a CSS transition emulator. It's used by the other plugins to check for CSS transition support and to catch hanging transitions.