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Share State Between Astro Components

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When building an Astro website, you may need to share state across components. Astro recommends the use of Nano Stores for shared client storage.

Recipe

  1. Install Nano Stores:
Terminal window
npm install nanostores
  1. Create a store. In this example, the store tracks whether a dialog is open or not:
src/store.js
import { atom } from 'nanostores';


export const isOpen = atom(false);
  1. Import and use the store in a <script> tag in the components that will share state.

The following Button and Dialog components each use the shared isOpen state to control whether a particular <div> is hidden or displayed:

src/components/Button.astro
<button id="openDialog">Open</button>


<script>
  import { isOpen } from '../store.js';


  // Set the store to true when the button is clicked
  function openDialog() {
    isOpen.set(true);
  }


  // Add an event listener to the button
  document.getElementById('openDialog').addEventListener('click', openDialog);
</script>
src/components/Dialog.astro
<div id="dialog" style="display: hidden">Hello world!</div>


<script>
  import { isOpen } from '../store.js';


  // Listen to changes in the store, and show/hide the dialog accordingly
  isOpen.subscribe(open => {
    if (open) {
      document.getElementById('dialog').style.display = 'block';
    } else {
      document.getElementById('dialog').style.display = 'none';
    }
  })


  document.getElementById('openDialog').addEventListener('click', openDialog);
</script>

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