that is present whether active or not.
- classNamePrefix (string)
- default: _loading_overlay_ - the prefix for all classNames on the generated elements. see Styling for more info.
- spinner (boolean OR node)
- default: false - renders the default spinner when true (and when the loader is active). Otherwise you can provide any valid react node to use your own spinner.
- text (node)
- default: undefined - the text or react node to render in the loader overlay when active.
- styles (object)
- default: undefined - see Styling for more info.

Custom Spinner :recycle:

Adding a custom spinner is super easy, here's an example:

Acquire the spinner you want to use. Doesn't matter where you get it, as long as you're rendering a valid React node. It can be a custom svg in your codebase if you want. For this example let's use react-spinners.

`
npm install react-spinners
`

Then simply provide it to the spinner prop for your loader.

`javascript
import LoadingOverlay from 'react-loading-overlay'
import BounceLoader from 'react-spinners/BounceLoader'

export default function MyLoader({ active, children }) {
return (
active={active}
spinner={}
>
{children}

)
}
`

Custom styling :nail_care:

Previous versions were difficult to customize because of limited configuration props. This iteration uses a form of styling heavily inspired by Style configuration was inspired by react-select. Internally using emotion to style elements and providing a styles interface to either extend the base styling or completely overwrite it. Additionally, a classNamePrefix prop is available to customize the classNames used on each element, allowing you to define your own styles with your own regular css setup.

Keep reading for details on each option.

$3

The styles prop accepts an object where each key represents one of the following elements:

- wrapper - main wrapping element, always present.
- overlay - the overlay positioned over top of the children.
- content - element inside the overlay containing the spinner and text.
- spinner - default spinner element.

Each value must be an object or a function (where the first parameter is the base default styles) that returns an object. In either case, the resulting object will be applied as the final set of styles via emotion.css. See examples below.

+

Custom overlay background (extending base styles)

`javascript
export default function MyLoader({ active, children }) {
return (
active={active}
styles={{
overlay: (base) => ({
...base,
background: 'rgba(255, 0, 0, 0.5)'
})
}}
>
{children}

)
}
`






+

Custom spinner size + color (extending base styles)

`javascript
export default function MyLoader({ active, children }) {
return (
active={active}
styles={{
spinner: (base) => ({
...base,
width: '100px',
'& svg circle': {
stroke: 'rgba(255, 0, 0, 0.5)'
}
})
}}
>
{children}

)
}
`






+

Custom wrapper (non-extended)

`javascript
export default function MyLoader({ active, children }) {
return (
active={active}
styles={{
wrapper: {
width: '400px',
height: '400px',
overflow: active ? 'hidden' : 'scroll'
}
}}
>
{children}

)
}
`





$3

Every element has a classname you can target via your own css configuration.

- _loading_overlay_wrapper
- _loading_overlay_overlay
- _loading_overlay_content
- _loading_overlay_spinner

You can also specify your own classNamePrefix if you wish. For example, if using: classNamePrefix="MyLoader_":

- MyLoader_wrapper
- MyLoader_overlay
- MyLoader_content
- MyLoader_spinner

The base styles will still be applied, but you could negate all of these using the styles prop:

+

Remove all default styles

`javascript
export default function MyLoader({ active, children }) {
return (
active={active}
styles={{
wrapper: {},
overlay: {},
content: {},
spinner: {}
}}
classNamePrefix='MyLoader_'
>
{children}

)
}
`





$3

You can style the loader using styled-component as you might expect.

Simply include the nested elements in your style definition:

+

styled-components example

`javascript
import styled from 'styled-components'

const StyledLoader = styled(LoadingOverlay)
width: 250px;
height: 400px;
overflow: scroll;
.MyLoader_overlay {
background: rgba(255, 0, 0, 0.5);
}
&.MyLoader_wrapper--active {
overflow: hidden;
}

export default function MyLoader({ active, children }) {
return (
active={active}
classNamePrefix='MyLoader_'
>
{children}

)
}
``