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Next.js

Next.js — Dynamic Imports and Static Pages

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We can create server-side rendered React apps and static sites easily Next.js.

In this article, we’ll take a look at dynamic imports and render static pages with Next.js.

Dynamic Import

ES2020 supports dynamic imports natively.

We can use this within our Next.js to dynamically import our components.

It also works with server-side rendering.

This lets us split our code into manageable chunks.

For example, we can write:

components/name.js

function Name() {
  return (
    <span>world</span>
  )
}

export default Name

pages/hello.js

import dynamic from 'next/dynamic'

const NameComponent = dynamic(() => import('../components/name'))

function Hello() {
  return (
    <div>hello <NameComponent /></div>
  )
}

export default Hello

We imported the dynamic function and passed in a callback that calls import to import the component.

Then we can use the NameComponent in our code.

Now we should see:

hello world

displayed.

Dynamic Component With Named Exports

We can create dynamic components with named exports.

To do that, we can write:

components/name.js

export function Name({ }) {
  return (
    <span>world</span>
  )
}

pages/hello.js

import dynamic from 'next/dynamic'

const NameComponent = dynamic(() => import('../components/Name').then((mod) => mod.Name)
)

function Hello() {
  return (
    <div>hello <NameComponent /></div>
  )
}

export default Hello

In the callback, we called import with the then callback to return the Name component from the module.

With Custom Loading Component

We can also add a component to show the component when the component loads.

For example, we can write:

components/name.js

function Name() {
  return (
    <span>world</span>
  )
}
export default Name

pages/hello.js

import dynamic from 'next/dynamic'

const NameComponent = dynamic(() => import('../components/Name'), { loading: () => <p>loading</p> })

function Hello() {
  return (
    <div>hello <NameComponent /></div>
  )
}

export default Hello

We have an object with the loading property in the code with a component as the value.

Disable Server-Side Rendering

Server-side rendering can be disabled by passing in an object into the dynamic function with the ssr property set to false .

For example, we can write:

components/name.js

function Name() {
  return (
    <span>world</span>
  )
}
export default Name

pages/hello.js

import dynamic from 'next/dynamic'

const NameComponent = dynamic(() => import('../components/Name'), { ssr: false }
)

function Hello() {
  return (
    <div>hello <NameComponent /></div>
  )
}

export default Hello

Static HTML Export

We can export our app to static HTML with the next export command.

It works by prerendering all the pages to HTML.

The pages can export a getStaticPaths property that returns all the paths that we want to prerender.

next export should be used when there are no dynamic data changes in our app.

To use it, we run:

next build && next export

next build builds the app and next export gets us the HTML pages.

We can also add both commands to our package.json file:

"scripts": {
  "build": "next build && next export"
}

and run npm run build to run it.

getInitialProps can’t be used with getStaticProps or getStaticPaths on any page.

Conclusion

We can dynamically import components with Next.js.

Also, we can build our Next.js app to static HTML files.

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