Issue
I've been trying to embed an external JavaScript source into my Next.js application and keep receiving following error:
Failed to execute 'write' on 'Document': It isn't possible to write into a document from an asynchronously-loaded external script unless it is explicitly opened.
The code I am trying to use can be found here - The map with the vessel has an option to embed it. So far the component that generates this error looks like this:
<div className={styles['container']}>
<Script type="text/javascript">
var width="100%";var height="400"; var mmsi=228402900;
</Script>
<Script
type="text/javascript"
src="https://www.vesselfinder.com/aismap.js">
</Script>
</div>
If I copy the embed code into CodePen it works just fine - link to my codepen with the embedded map here.
Does somebody know what could be the problem here?
Solution
The issue occurs because the external script is being loaded asynchronously by next/script, thus ignoring the document.write() call present in the script.
From Document.write() MDN documentation:
Note: Using
document.write()in deferred or asynchronous scripts will be ignored and you'll get a message like "A call todocument.write()from an asynchronously-loaded external script was ignored" in the error console.
You'll need to set the Script strategy to beforeInteractive so the script is added to <head>, and explicitly set the defer property to false to prevent the script from being loaded asynchronously.
<Script
type="text/javascript"
src="https://www.vesselfinder.com/aismap.js"
strategy="beforeInteractive"
defer={false}
></Script>
Answered By - juliomalves
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