$ npm install gatsby-plugin-layout
This plugin reimplements the behavior of layout components in gatsby@1
, which was removed in version 2.
npm install --save gatsby-plugin-layout@next
Add the plugin to your gatsby-config.js
:
By default plugin will try to use Layout component located in src/layouts/index.js
(same as Gatsby v1)
module.exports = {
plugins: [
`gatsby-plugin-layout`
]
];
If you prefer to keep layout in different place, you can use component
option:
module.exports = {
plugins: [
{
resolve: `gatsby-plugin-layout`,
options: {
component: require.resolve(`./relative/path/to/layout/component`)
}
}
]
];
There are a few scenarios where it makes sense to reimplement the V1 layout handling:
In the original implementation, the layout component was wrapped around the outside of the page component, which, in pseudo-code, looked something like this:
<Root>
<Layout>
{/* layout is not affected when the page template changes */}
<PageElement>{/* page content here */}</PageElement>
</Layout>
</Root>
This meant that the layout component could manage things like transitions and persistent state without any special workarounds, because it never rerendered.
In version 2, the layout component is no longer special, and it's included in every page that wants to display it. This means that it does rerender on every route change:
<Root>
<PageElement>
{/* layout will rerender each time the page template changes */}
<Layout>{/* page content here */}</Layout>
</PageElement>
</Root>
This can make it complicated to support transitions or state without using the wrapPageElement
browser API (and the SSR equivalent). This plugin implements those APIs for you, which reimplements the behavior of Gatsby V1.
Use React Context to pass data both ways.
For example you can use this boilerplate:
// Context.js
import React from "react"
const defaultContextValue = {
data: {
// set your initial data shape here
showMenu: false,
},
set: () => {},
}
const { Provider, Consumer } = React.createContext(defaultContextValue)
class ContextProviderComponent extends React.Component {
constructor() {
super()
this.setData = this.setData.bind(this)
this.state = {
...defaultContextValue,
set: this.setData,
}
}
setData(newData) {
this.setState(state => ({
data: {
...state.data,
...newData,
},
}))
}
render() {
return <Provider value={this.state}>{this.props.children}</Provider>
}
}
export { Consumer as default, ContextProviderComponent }
Use Provider in Layout Component:
import { ContextProviderComponent } from "./Context"
export default ({ children }) => (
<ContextProviderComponent>
<Header />
{children}
<Footer />
</ContextProviderComponent>
)
And then you can use it anywhere:
import ContextConsumer from "./Context"
const ComponentThatReadState = () => (
<ContextConsumer>
{({ data }) => {
data.menuOpen ? <Menu /> : null
}}
</ContextConsumer>
)
import ContextConsumer from "./Context"
const ComponentThatChangeState = () => (
<ContextConsumer>
{({ data, set }) => (
<div onClick={() => set({menuOpen: !data.menuOpen})}>
{data.menuOpen ? `Opened Menu` : `Closed Menu`}
</div>
)}
</ContextConsumer>
)
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