Hey there! Let's troubleshoot those stubborn Owl Carousel features that aren't kicking in. I've run into this exact issue before with the owlcarousel2-rails gem, so here are the most common fixes to get your nav arrows and autoplay working:

First off, make sure you're explicitly enabling the features in your carousel initialization code—they're disabled by default, and even a tiny typo can break things. Here's a solid baseline to start with:

$(document).on('turbolinks:load', function(){
  $(".owl-carousel").owlCarousel({
    nav: true, // Required to turn on navigation arrows
    autoplay: true, // Required to enable autoplay
    autoplayTimeout: 3000, // Optional: Set delay between slides (ms)
    autoplayHoverPause: true, // Optional: Pause autoplay on mouse hover
    items: 1, // Adjust based on how many slides you want visible
    // Add your other custom options here
  });
});

Also, double-check that your selector (.owl-carousel) matches the class on your carousel container in your .html.erb—a mismatched class will mean the script never targets the right element.

Even if you think you've set up assets correctly, missing the theme stylesheet is a super common culprit for missing nav arrows:

• In application.js, confirm the Owl Carousel script loads before your custom initialization code:

  //= require owl.carousel
  //= require_tree . // Make sure your custom JS is loaded after
  

• In application.scss, don't forget the default theme (this is where the nav arrow styles live):

  @import "owl.carousel";
  @import "owl.theme.default"; // Critical for nav arrow visibility and styling
  

If you're using a .css file instead of SCSS, use this syntax:

*= require owl.carousel
*= require owl.theme.default

If your Rails app uses Turbolinks, the standard $(document).ready() won't fire when navigating between pages, which can stop your carousel from initializing properly. That's why the example above uses turbolinks:load instead—it ensures the script runs every time a page loads, even via Turbolinks.

Open up your browser's developer tools (F12) to spot hidden issues:

• Console Tab: Look for errors like $ is not defined (jQuery isn't loaded) or Cannot read property 'owlCarousel' of undefined (Owl Carousel script is missing). Fix these first—they'll block all carousel functionality.
• Elements Tab: Check if your carousel container has the owl-loaded class (means initialization worked). Then look for the owl-nav element—if it's missing, your nav: true setting isn't being picked up.
• Network Tab: Confirm owl.carousel.js and owl.theme.default.css are loading with a 200 status code. If they're 404, your asset paths are misconfigured.

If nothing else works, strip down your code to eliminate conflicts:

• Use a simple carousel structure in your .html.erb:

  <div class="owl-carousel">
    <div><img src="/assets/slide1.jpg" alt="Slide 1"></div>
    <div><img src="/assets/slide2.jpg" alt="Slide 2"></div>
    <div><img src="/assets/slide3.jpg" alt="Slide 3"></div>
  </div>
  

• Use the bare-bones initialization code from section 1. If this works, gradually add back your custom styles, other plugins, and additional carousel options to find what's causing the conflict.

内容的提问来源于stack exchange，提问作者Fagner Rodrigues