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# Popovers

Documentation and examples for adding Bootstrap popovers, like those found in iOS, to any element on your site.

## Overview

Things to know when using the popover plugin:

- Popovers rely on the 3rd party library Popper.js for positioning. You must include popper.min.js before bootstrap.js or use `bootstrap.bundle.min.js` / `bootstrap.bundle.js` which contains Popper.js in order for popovers to work!
- Popovers require the tooltip plugin as a dependency.
- If you’re building our JavaScript from source, it requires `util.js`.
- Popovers are opt-in for performance reasons, so you must initialize them yourself.
- Zero-length `title` and `content` values will never show a popover.
- Specify `container: 'body'` to avoid rendering problems in more complex components (like our input groups, button groups, etc).
- Triggering popovers on hidden elements will not work.
- Popovers for `.disabled` or `disabled` elements must be triggered on a wrapper element.
- When triggered from anchors that wrap across multiple lines, popovers will be centered between the anchors’ overall width. Use `.text-nowrap` on your `<a>`s to avoid this behavior.
- Popovers must be hidden before their corresponding elements have been removed from the DOM.

Keep reading to see how popovers work with some examples.

## Example: Enable popovers everywhere

One way to initialize all popovers on a page would be to select them by their `data-toggle` attribute:

    $(function () {
      $('[data-toggle="popover"]').popover()
    })

## Example: Using the `container` option

When you have some styles on a parent element that interfere with a popover, you’ll want to specify a custom `container` so that the popover’s HTML appears within that element instead.

    $(function () {
      $('.example-popover').popover({
        container: 'body'
      })
    })

## Example

    <button type="button" class="btn btn-lg btn-danger" data-toggle="popover" title="Popover title" data-content="And here's some amazing content. It's very engaging. Right?">Click to toggle popover</button>

### Four directions

Four options are available: top, right, bottom, and left aligned.

    <button type="button" class="btn btn-secondary" data-container="body" data-toggle="popover" data-placement="top" data-content="Vivamus sagittis lacus vel augue laoreet rutrum faucibus.">
      Popover on top
    </button>

    <button type="button" class="btn btn-secondary" data-container="body" data-toggle="popover" data-placement="right" data-content="Vivamus sagittis lacus vel augue laoreet rutrum faucibus.">
      Popover on right
    </button>

    <button type="button" class="btn btn-secondary" data-container="body" data-toggle="popover" data-placement="bottom" data-content="Vivamus
    sagittis lacus vel augue laoreet rutrum faucibus.">
      Popover on bottom
    </button>

    <button type="button" class="btn btn-secondary" data-container="body" data-toggle="popover" data-placement="left" data-content="Vivamus sagittis lacus vel augue laoreet rutrum faucibus.">
      Popover on left
    </button>

### Dismiss on next click

Use the `focus` trigger to dismiss popovers on the user’s next click of a different element than the toggle element.

#### Specific markup required for dismiss-on-next-click

For proper cross-browser and cross-platform behavior, you must use the `<a>` tag, not the `<button>` tag, and you also must include a `tabindex` attribute.

Dismissible popover

    <a tabindex="0" class="btn btn-lg btn-danger" role="button" data-toggle="popover" data-trigger="focus" title="Dismissible popover" data-content="And here's some amazing content. It's very engaging. Right?">Dismissible popover</a>

    $('.popover-dismiss').popover({
      trigger: 'focus'
    })

### Disabled elements

Elements with the `disabled` attribute aren’t interactive, meaning users cannot hover or click them to trigger a popover (or tooltip). As a workaround, you’ll want to trigger the popover from a wrapper `<div>` or `<span>` and override the `pointer-events` on the disabled element.

For disabled popover triggers, you may also prefer `data-trigger="hover"` so that the popover appears as immediate visual feedback to your users as they may not expect to click on a disabled element.

    <span class="d-inline-block" data-toggle="popover" data-content="Disabled popover">
      <button class="btn btn-primary" style="pointer-events: none;" type="button" disabled>Disabled button</button>
    </span>

## Usage

Enable popovers via JavaScript:

    $('#example').popover(options)

### Options

Options can be passed via data attributes or JavaScript. For data attributes, append the option name to `data-`, as in `data-animation=""`.

Name | Type | Default | Description
--- | --- | --- | ---
animation | boolean | true | Apply a CSS fade transition to the popover
container | string | element | false | false | Appends the popover to a specific element. Example: `container: 'body'`. This option is particularly useful in that it allows you to position the popover in the flow of the document near the triggering element - which will prevent the popover from floating away from the triggering element during a window resize.
content | string | element | function | '' | Default content value if `data-content` attribute isn't present. If a function is given, it will be called with its `this` reference set to the element that the popover is attached to.
delay | number | object | 0 | Delay showing and hiding the popover (ms) - does not apply to manual trigger type If a number is supplied, delay is applied to both hide/show Object structure is: `delay: { "show": 500, "hide": 100 }`
html | boolean | false | Insert HTML into the popover. If false, jQuery's `text` method will be used to insert content into the DOM. Use text if you're worried about XSS attacks.
placement | string | function | 'right' | How to position the popover - auto | top | bottom | left | right. When `auto` is specified, it will dynamically reorient the popover. When a function is used to determine the placement, it is called with the popover DOM node as its first argument and the triggering element DOM node as its second. The `this` context is set to the popover instance.
selector | string | false | false | If a selector is provided, popover objects will be delegated to the specified targets. In practice, this is used to enable dynamic HTML content to have popovers added. See this and an informative example.
template | string | `'<div class="popover" role="tooltip"><div class="arrow"></div><h3 class="popover-header"></h3><div class="popover-body"></div></div>'` | Base HTML to use when creating the popover. The popover's `title` will be injected into the `.popover-header`. The popover's `content` will be injected into the `.popover-body`. `.arrow` will become the popover's arrow. The outermost wrapper element should have the `.popover` class.
title | string | element | function | '' | Default title value if `title` attribute isn't present. If a function is given, it will be called with its `this` reference set to the element that the popover is attached to.
trigger | string | 'click' | How popover is triggered - click | hover | focus | manual. You may pass multiple triggers; separate them with a space. `manual` cannot be combined with any other trigger.
offset | number | string | 0 | Offset of the popover relative to its target. For more information refer to Popper.js's offset docs.
fallbackPlacement | string | array | 'flip' | Allow to specify which position Popper will use on fallback. For more information refer to Popper.js's behavior docs
boundary | string | element | 'scrollParent' | Overflow constraint boundary of the popover. Accepts the values of `'viewport'`, `'window'`, `'scrollParent'`, or an HTMLElement reference (JavaScript only). For more information refer to Popper.js's preventOverflow docs.

#### Data attributes for individual popovers

Options for individual popovers can alternatively be specified through the use of data attributes, as explained above.

### Methods

#### Asynchronous methods and transitions

All API methods are asynchronous and start a transition. They return to the caller as soon as the transition is started but before it ends. In addition, a method call on a transitioning component will be ignored.

See our JavaScript documentation for more information.

#### `$().popover(options)`

Initializes popovers for an element collection.

#### `.popover('show')`

Reveals an element’s popover. Returns to the caller before the popover has actually been shown (i.e. before the `shown.bs.popover` event occurs). This is considered a “manual” triggering of the popover. Popovers whose both title and content are zero-length are never displayed.

    $('#element').popover('show')

#### `.popover('hide')`

Hides an element’s popover. Returns to the caller before the popover has actually been hidden (i.e. before the `hidden.bs.popover` event occurs). This is considered a “manual” triggering of the popover.

    $('#element').popover('hide')

#### `.popover('toggle')`

Toggles an element’s popover. Returns to the caller before the popover has actually been shown or hidden (i.e. before the `shown.bs.popover` or `hidden.bs.popover` event occurs). This is considered a “manual” triggering of the popover.

    $('#element').popover('toggle')

#### `.popover('dispose')`

Hides and destroys an element’s popover. Popovers that use delegation (which are created using the `selector` option) cannot be individually destroyed on descendant trigger elements.

    $('#element').popover('dispose')

#### `.popover('enable')`

Gives an element’s popover the ability to be shown. Popovers are enabled by default.

    $('#element').popover('enable')

#### `.popover('disable')`

Removes the ability for an element’s popover to be shown. The popover will only be able to be shown if it is re-enabled.

    $('#element').popover('disable')

#### `.popover('toggleEnabled')`

Toggles the ability for an element’s popover to be shown or hidden.

    $('#element').popover('toggleEnabled')

#### `.popover('update')`

Updates the position of an element’s popover.

    $('#element').popover('update')

### Events

Event Type | Description
--- | ---
show.bs.popover | This event fires immediately when the `show` instance method is called.
shown.bs.popover | This event is fired when the popover has been made visible to the user (will wait for CSS transitions to complete).
hide.bs.popover | This event is fired immediately when the `hide` instance method has been called.
hidden.bs.popover | This event is fired when the popover has finished being hidden from the user (will wait for CSS transitions to complete).
inserted.bs.popover | This event is fired after the `show.bs.popover` event when the popover template has been added to the DOM.

    $('#myPopover').on('hidden.bs.popover', function () {
      // do something…
    })