#accessing a server variable from the client

3 messages · Page 1 of 1 (latest)

jade sapphire
#

how can i access isOpen (a server variable) on the script below (a client script):

// Component imports

let isOpen: boolean = false;
---

<script>
    isOpen = !isOpen;
</script>
mossy quiverBOT
#

Hi @jade sapphire. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

#

In Astro, the code in the frontmatter (between the --- fences) runs on the server and is not available in the browser. To send variables from the server to the client, you can use define:vars={...} directive to pass server-side variables from your component frontmatter into the client <script> tags. Any JSON-serializable frontmatter variable is supported, including props passed to your component through Astro.props. Values are serialized with JSON.stringify().

Here's how you can modify your code to pass the isOpen variable to the client script:

---
// Component imports

let isOpen: boolean = false;
---

<script define:vars={{ isOpen }}>
    isOpen = !isOpen;
</script>

Please note that using define:vars on a <script> tag implies the is:inline directive, which means your scripts won’t be bundled and will be inlined directly into the HTML. This is because when Astro bundles a script, it includes and runs the script once even if you include the component containing the script multiple times on one page. define:vars requires a script to rerun with each set of values, so Astro creates an inline script instead.

For more information, you can refer to the Astro documentation on define:vars (https://docs.astro.build/en/reference/directives-reference#definevars).

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