prisma cairn
Hello is it possible to conditionally add the variable in the script tag?
Example:
let props = ['prop-content-1', 'prop-content-2']
if(somecondition === true){
// export prop if condition is met, otherwise no
}
<script define:vars={{props}} type="module">
console.log(props) // empty if the condition above doesn't pass
</script
past violetBOT
Hi @prisma cairn. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
Yes, it is possible to conditionally add variables in the script tag using define:vars in Astro. However, the condition should be defined in the frontmatter script and the variable should be JSON-serializable. Here's an example:
---
let props = ['prop-content-1', 'prop-content-2']
let conditionProps = somecondition === true ? props : [];
---
<script define:vars={{props: conditionProps}} type="module">
console.log(props) // empty if the condition above doesn't pass
</script>
In this example, props will only be passed to the script if somecondition is true. If somecondition is false, an empty array will be passed instead.
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[^1^].
Also, be aware that adding define:vars to a script tag can break imported client scripts[^2^]. If you encounter issues, you might want to consider passing variables to scripts manually[^1^].