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How to insert some JavaScript to your theme in Shopify

Sam Nguyen
Sam Updated: April 06, 2024


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Shopify gives you permission to quickly add new features and functionalities to your web without having to redesign your whole theme. You are able to add the functionality by inserting plugins and in case the functionality that you would like to add is not large enough to generate a plugin, which comprises just several lines of code, you are able to employ the functions.php file rather than generating a separate plugin. The best thing about the functions.php file is that it can act like a plugin, which can be employed to insert many features and extend the functionality of not only the theme but also Shopify installation.

Now, let’s take a look at our instructional writing on How to insert JavaScript to your theme to know more deeply about this topic.

How to insert JavaScript to your theme

Add Custom JavaScript to your site

There are so many methods to add custom JavaScript to your site, every individual has its own uses.

- Embed a new Javascript file to your template for any pages, such as for adding a third-party service like Google Analytics

- Insert a script into select pages using a plugin like Headers and Footers

- Employ functions.php to add it as part of the output of the template

Embed JavaScript in your Template

To repeatedly use JavaScript within your site, you may have created a script or need to insert a third party script in all pages. You are allowed to set the call for the JavaScript, or the script itself, in the head of your header.php template file. This should be added between the style sheet link and the meta tags. This is exactly the same as if you were inserting JavaScript in any HTML page.

To “add” the JavaScript file into your site, in the head, please use the code: below

<script type="text/javascript" src="https://cdn.collectiveray.com/scripts/myscript.js"></script>

Please note that your site will not be valid until you are certain that you have defined the type correctly. You can then add any reference to functions used within the file you just added to the HTML where you need to use it.

For instance, this is an example of using the function you just added.

<h3 class="heading3">
<a href="/<?php the_permalink() ?>" >
Heading goes here</a></h3>
<script type="text/javascript">

Add Javascript to your site using functions.php {how-to-add-javascript-to-your-site-using-functionsphp}

We highly recommend you to add a javascript file to your WordPress theme is by using functions.php file with wp_enqueue_script.

Please follow the guide below.

Open your functions.php file and copy the below code snippet to it. Make sure you replace the template URL with yours before saving.

function my_theme_scripts_function() {

  wp_enqueue_script( 'myscript', get_template_directory_uri() . '/js/myscript.js');



In case you are using a child theme, instead of using get_template_directory_uri(), you may need to use get_stylesheet_directory_uri().


To sum up, while improve the website with some new features, you will require adding several additional JavaScript files to your Shopify theme (especially in case you are trying to serve your customers afriendlier user experience or in case you are verifying your site with third-party services). We hope that this instruction has well done its job!

Sam Nguyen is the CEO and founder of Avada Commerce, an e-commerce solution provider headquartered in Singapore. He is an expert on the Shopify e-commerce platform for online stores and retail point-of-sale systems. Sam loves talking about e-commerce and he aims to help over a million online businesses grow and thrive.

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