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I have a NextJS app and the page structure loosely looks like this:

<Head>
<Navigation>
<Page>
<Footer>

I have a DTM script that I need to load in the <Head> ponent and then there are tags that I am firing in the <Page> ponent. But the problem is, the tags in <Page> starts firing before the DTM script get's loaded onto the page.

So, is there a way to let the DTM script in the <Head> tag load first before the <Page> ponent loads? I was looking to use "ponentwillmount" but it's being deprecated.

Can someone please advice how can I tackle this issue?

I have a NextJS app and the page structure loosely looks like this:

<Head>
<Navigation>
<Page>
<Footer>

I have a DTM script that I need to load in the <Head> ponent and then there are tags that I am firing in the <Page> ponent. But the problem is, the tags in <Page> starts firing before the DTM script get's loaded onto the page.

So, is there a way to let the DTM script in the <Head> tag load first before the <Page> ponent loads? I was looking to use "ponentwillmount" but it's being deprecated.

Can someone please advice how can I tackle this issue?

  • javascript
  • reactjs
  • next.js
Share Improve this question edited Mar 6, 2020 at 19:27 Blueboye asked Mar 6, 2020 at 19:23 BlueboyeBlueboye 1,4944 gold badges27 silver badges54 bronze badges 5
  • does the external script provide a callback? – Daniel A. White Commented Mar 6, 2020 at 19:24
  • You could use next/head to place the <script> of the DTM script in the <head> - that'll hopefully load before nextjs' code. Ideally you'd want to place it in <body> before wherever nextjs places its code. – cbr Commented Mar 6, 2020 at 19:28
  • 1 I've already used react-load-script with nextjs, it has an onLoad callback you can use. Also you can use nextjs lazy load on the ponents you want to be rendered after the ponent mount. – Italo Ayres Commented Mar 6, 2020 at 19:41
  • I am using next/head already in my <Head> ponent. I have added the scripts there. I am actually making a call to one my /static/js files and that js file then loads the external DTM script based on the current hostname. But, the DTM functions in <Page> ponents are firing before the script is pletely loaded and executed. – Blueboye Commented Mar 6, 2020 at 20:01
  • I'm having the same issue. I put the tinyMCE script in next/head and it's about a 50% chance the script will be loaded by the time the page is mounted. And if it isn't, my editor doesn't display. – Nickprovs Commented May 29, 2020 at 4:42
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3 Answers 3

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You could listen to the script load event from your <Page> ponent using vanilla javascript. in your custom _document:

<script id="dtm" src="dtm.js" />

then in the <Page> ponent:

document.getElementById("dtm").addEventListener('load', () => {
  // DTM is loaded
})

next.js offers onLoad, which triggers once the external script is loaded:

<Script src="https://example/script.js"
    onLoad={() => {
        console.log('script has loaded')
    }
/>

You can use Head in any ponents by Nextjs. How about you add Head in Page and put <script/> inside

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