How to sync two nestable sliders in Bricks

In this tutorial, we’ll learn how to sync two nestable sliders in Bricks: one will be the main slider and the other one will be a thumbnail slider.

Table of Contents


This tutorial is a follow-up to the great video of Udoro ‘Cracka’ Essien shared recently in the group. He explained how to sync two nested sliders in Bricks: one main slider and one used as a thumbnail.

This tutorial enhances the previous code shared by Cracka and allows you to:

  • set and forget the Javascript Code. Once enqueued, you don’t have to touch it again as it’s based on classes rather than IDs
  • insert multiple sync sliders on the same page
  • avoid possible conflict with other plugins/snippets
  • reduce the amount of JS calculation by debouncing the function on resize

Let’s dive into it!

The DOM tree

In order to work, we need

  • a container (or a section / block / div) with the class .sync-sliders-wrapper
  • the two sliders to be children of the container
  • the main slider needs the class .sync-sliders-main
  • the thumbnail slider needs the class .sync-sliders-thumb

The JSON settings for the Thumbnail slider

As explained by Cracka in his video, you need to insert a custom JSON object as the thumbnail slider setting options. I’ll just paste the code for reference:

   "focus": "center",
   "isNavigation": true,
   "updateOnMove": true, 

The most important string here is "isNavigation": true that will set the slider as a navigation slider.

Note: There should NOT be a comma before the cursor position as it appears in the screenshot

The JavaScript Code

Enqueue the following code in your child theme or use a code snippet plugin:

document.addEventListener('DOMContentLoaded', () => {

   // Query all the wrappers
   const wrappers = document.querySelectorAll('.sync-sliders-wrapper');

   // Stop the function if there is no sync slider
   if (wrappers.length < 1) return;

   // Debounce function
   const debounce = (fn, threshold) => {
      var timeout;
      threshold = threshold || 200;
      return function debounced() {
         var args = arguments;
         var _this = this;

         function delayed() {
            fn.apply(_this, args);
         timeout = setTimeout(delayed, threshold);

   // Init function
   const init = (mainSliderId, thumbSliderId) => {
      const main = bricksData.splideInstances[mainSliderId],
         thumbnail = bricksData.splideInstances[thumbSliderId];

      // Mount the sync slider


   // Loop into each wrapper
   wrappers.forEach(wrapper => {

      // Set the ID of the main slider
      const mainSlider = wrapper.querySelector('.sync-sliders-main');

      // Check if the main slider class is correctly set
      if (!mainSlider) return console.log('No .sync-sliders-main class found');
      const mainSliderId = mainSlider.dataset.scriptId;

      // Set the ID of the thumb slider
      const thumbSlider = wrapper.querySelector('.sync-sliders-thumb');

      // Check if the thumb slider class is correctly set
      if (!thumbSlider) return console.log('No .sync-sliders-thumb class found');
      const thumbSliderId = thumbSlider.dataset.scriptId;

      // Run the function on load
      setTimeout(() => {
         init(mainSliderId, thumbSliderId);
      }, 0);

      // Rerun the function on resize because bricks reinit the sliders on each resize event
      window.addEventListener("resize", debounce(() => {
         init(mainSliderId, thumbSliderId);
      }, 300));

The result

If everything worked, you should see this result on frontend:


Debounce function

The YouTube video of Cracka

The original JavaScript code of Cracka

The JSON object of the thumbnail slider

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