mayre
v4.0.0
Published
Maybe render a React component, maybe not 😮
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Maybe render a React component, maybe not 😮
// Get it!
yarn add mayre
npm install --save mayre
While working with React you'll find yourself making conditionals components quite a lot of times. And they're always the same: a component which upon a set of conditions may render or just return null (or short-circuit it).
Here comes Mayre (Maybe render)! A very simple and super light (2kb)
component to tackle this issue from the jsx
side.
Compatible with React, React-Native and ReactVR.
Usage
Maybe
There are three props you can use: of
, when
and with
.
<Mayre
of={MyComponent}
when={props.something > 10}
with={{ some: 'thing' }}
/>
Note that of
can be a component instance or declaration. And when can be boolean
or a function.
<Mayre
of={<p>Something</p>}
when={() => checkWhatever()}
/>
Either
But not only this! Conditional rendering isn't only about mount this component or not. We can also use Mayre to render either this element or the other.
<Mayre
of={<p>Either this</p>}
or={<p>Or this one</p>}
when={whateverCondition}
/>
If a with
prop is provided it'll be applied to both of them. If you want to specify special props for each of them use orWith
.
<Mayre
of={<p>Either this</p>}
or={<p>Or this one</p>}
when={whateverCondition}
with={{ appliedTo: 'of' }}
orWith={{ appliedTo: 'this will used by or element' }}
/>
Auto props picking
Most of the times the component rendered by Mayre is a subset of a bigger one. Hence, it's using a selection of the parent props. That's why Mayre has a special syntax to pick the props you need to while passing them down.
<Mayre
of={MyComponent}
when={props.something > 10}
with={[props, 'thisProps', 'andThisOther']}
/>
Same can be applied for orWith
attribute.
Props
| Name | Required | Default | Type |Comment |
|--------|----------|---------|-------------------|----------------------------------------|
| of | Yes | - | func
, element
| The React component to be rendered |
| or | No | null
| func
, element
| The React component rendered instead of of
|
| when | No | false
| bool
, func
| The render condition |
| with | No | {}
| object
, array
| Props to be passed to of/or
component |
| orWith | No | {}
| object
, array
| Props to be passed to or
component |
Benefit
Stop doing this:
// no more dumb render methods pollution
const renderSomething = (canRender, propsFromParent) => {
if (!canRender) return null
return <Something {...propsFromParent} />
}
const Parent = (props) => (
<div>
{renderSomething(props.a === props.b, props)}
</div>
)