Troubleshooting: t.trigger is not a function Error

This error typically occurs due to jQuery conflicts or loading issues in WordPress. Here’s a comprehensive guide to diagnose and fix the problem.

Potential Causes & Solutions

1. jQuery Version or Loading Conflict

• Sometimes older themes or plugins can load outdated jQuery or override the default WordPress jQuery
• Check if your theme or another plugin is re-registering or dequeuing jQuery
• Ensure jQuery is loaded properly before any script that uses t.trigger

2. Caching / Minification Plugins

• If you’re using plugins like WP Rocket, W3 Total Cache, or any minification tool:
  • Try excluding jquery.blockUI.min.js from being combined or minified
  • Clear the cache and check if the error persists

3. Conflicts With Other Plugins

Even if you “cannot” deactivate WooCommerce, you could:

• Temporarily deactivate or test on a staging site if possible
• Disable other plugins one by one on a staging environment to identify the conflict

4. Check for a Theme-Specific Issue

• Switch temporarily to a default WordPress theme (e.g., Twenty Twenty-Three) on a staging environment
• If the error disappears, the conflict might be in your theme’s scripts

5. Elementor Incompatibility

• Ensure both WooCommerce and Elementor are fully up-to-date
• Check Elementor’s system info to see if it flags any known conflicts

6. Look for JavaScript Console Errors

• The t.trigger is not a function error can be a symptom of a deeper issue
• There might be a script that redefines or wraps jQuery incorrectly
• Open your browser’s dev tools > Console tab to look for other errors that appear before or after this one

Quick Troubleshooting Steps

1. Disable Minification (on a staging site) to see if that helps

2. Turn off or rollback recent updates to see if the conflict disappears

3. Enable SCRIPT_DEBUG in wp-config.php to force WordPress to load non-minified scripts:

   define('SCRIPT_DEBUG', true);
   

   This can give you a more verbose stack trace in the Console.

4. Update Everything:

   • WordPress core
   • WooCommerce
   • Elementor
   • Theme
   • Other active plugins

Summary

• The error t.trigger is not a function typically indicates a jQuery loading conflict or script misconfiguration
• If you can’t disable WooCommerce, use a staging or local environment for conflict testing
• Key areas to check:
  • Caching/minification settings
  • Component updates
  • Plugin/theme jQuery overrides

By methodically isolating the conflict—usually via a staging site—and checking your minification/caching settings, you should be able to resolve (or at least identify) the root cause of the issue.