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# react-popover
A specification backed popover for react. https://littlebits.github.io/react-popover/build[Live demo].

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## Installation

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npm install --save react-popover
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## Demo

There is a demo that you can see https://littlebits.github.io/react-popover/build[here]. To run it locally do `npm start`. If you do not see logs in the console refresh the browser once (https://github.com/littlebits/react-popover/issues/35).


## API

### `export default` `Popover(props, target)`

#### `props :: {...}`

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##### `body :: Node | Array Node`
The `popover` content. Content is rooted (becomes children of) `.Popover-body` and thus `body` can be a single `node` _or an array of `nodes`_.

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##### `isOpen :: Boolean`
Determines Whether or not the popover is rendered.

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##### `preferPlace :: Enum String | Null`
Sets a ***preference*** of where to position the Popover. Only useful to specify placement in case of multiple available fits. Defaults to `null`. Valid values are:

`above | right | below | left` :: Prefer an explicit side.
`row | column` :: Prefer an orientation.
`start | end` :: Prefer an order.
`null` :: No preference, automatic resolution. This is the default.

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##### `place :: String | Null`
Like `preferPlace` except that the given place is a ***requirement***. The resolver becomes scoped or disabled. It is scoped if the `place` is an `orientation` or `order` but disabled if it is a `side`. For example `place: "row"` scopes the resolver to `above` or `below` placement but `place: "above"` removes any need for the resolver.

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##### `onOuterAction :: Function`
A callback function executed every time the user does an action (`mousedown` or `touchstart`) outside the DOM tree of both `Popover` and `Target`. A canonical use-case is to automatically close the Popover on any external user action.
* Plus support for standard props...: `className`, `style`

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##### `refreshIntervalMs :: Number | Falsey`
The polling speed (AKA time between each poll) in milliseconds for checking if a layout refresh is required. This polling is required because it is the only robust way to track the position of a target in the DOM. Defaults to `200`. Set to a falsey value to disable.

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#### `target :: React Element`

- The React Element that this popover will orient itself around. `target` `rendering tree` is unaffected. `Popover` _will_ become its `owner`.