The Frustrating Case of onAnimationComplete Not Firing in Framer-Motion: A Comprehensive Guide to Debugging and Resolution

Are you tired of banging your head against the wall, wondering why onAnimationComplete refuses to fire in your Framer-Motion project? You’re not alone! This pesky issue has plagued many a developer, leaving them scratching their heads and questioning their sanity. Fear not, dear reader, for we’re about to embark on a journey to uncover the most common causes and provide actionable solutions to get onAnimationComplete firing like a charm.

Table of Contents

Understanding onAnimationComplete
Common Causes of onAnimationComplete Not Firing
Debugging Techniques for onAnimationComplete Issues
Solutions for Common onAnimationComplete Issues
1. 1. onAnimationComplete Not Firing on Repeat Animations
2. 2. onAnimationComplete Not Firing on Conditional Animations
Conclusion

Understanding onAnimationComplete

Before we dive into the troubleshooting process, let’s take a step back and understand what onAnimationComplete is and how it’s supposed to work. onAnimationComplete is a callback function provided by Framer-Motion that allows you to execute code once an animation has completed. It’s a powerful tool that enables you to chain animations, update state, or perform other actions once an animation has reached its conclusion.

import { motion } from 'framer-motion';

function MyComponent() {
  return (
     console.log('Animation complete!')}
    >
      I am an animated div!
    
  );
}

Common Causes of onAnimationComplete Not Firing

Now that we’ve covered the basics, let’s explore the most common reasons why onAnimationComplete might not be firing in your Framer-Motion project.

1. Missing or Incorrect Animation Definition

Ah, the most obvious culprit! If your animation definition is incorrect or missing altogether, onAnimationComplete will never fire. Double-check that you’ve defined the animation correctly, and that the animation is actually being triggered.

import { motion } from 'framer-motion';

function MyComponent() {
  return (
    <motion.div
      // Oops, no animation definition!
      onAnimationComplete={() => console.log('Animation complete!')}
    >
      I am an animated div!
    </motion.div>
  );
}

2. Animation Not Being Triggered

It’s possible that your animation is not being triggered at all. Make sure that the animation is being triggered by a valid event, such as a click or hover. Additionally, ensure that the animation is not being interrupted or cancelled prematurely.

import { motion } from 'framer-motion';

function MyComponent() {
  const [isAnimating, setIsAnimating] = useState(false);

  return (
    <motion.div
      initial={{ opacity: 0 }}
      animate={{ opacity: 1 }}
      onAnimationComplete={() => console.log('Animation complete!')}
      onClick={() => setIsAnimating(true)}
    >
      I am an animated div!
    </motion.div>
  );
}

3. Incorrect Callback Function

The onAnimationComplete callback function must be a valid function. If you’re passing an invalid function or an undefined value, onAnimationComplete will not fire. Ensure that your callback function is correctly defined and returns a valid value.

import { motion } from 'framer-motion';

function MyComponent() {
  return (
    <motion.div
      initial={{ opacity: 0 }}
      animate={{ opacity: 1 }}
      onAnimationComplete={null} // Oops, null is not a function!
    >
      I am an animated div!
    </motion.div>
  );
}

4. Conflicting Animation Libraries

If you’re using multiple animation libraries in your project, they might be conflicting with each other. Framer-Motion is designed to work alongside other animation libraries, but sometimes, conflicts can arise. Try isolating Framer-Motion and see if the issue persists.

5. Incorrect Framer-Motion Version

Framer-Motion is constantly evolving, and sometimes, newer versions can introduce breaking changes. Ensure that you’re using the correct version of Framer-Motion that corresponds to your project’s requirements.

Debugging Techniques for onAnimationComplete Issues

When debugging onAnimationComplete issues, it’s essential to have the right tools and techniques at your disposal. Here are some strategies to help you identify and resolve the problem.

1. Console Logging

A trusty old friend, console logging can help you verify that the animation is being triggered and that the onAnimationComplete callback is being called. Add console logs at strategic points in your code to track the animation’s progress.

import { motion } from 'framer-motion';

function MyComponent() {
  return (
    <motion.div
      initial={{ opacity: 0 }}
      animate={{ opacity: 1 }}
      onAnimationStart={() => console.log('Animation started!')}
      onAnimationComplete={() => console.log('Animation complete!')}
    >
      I am an animated div!
    </motion.div>
  );
}

2. Animation Inspection Tools

Framer-Motion provides an animation inspection tool that allows you to visualize and inspect your animations. This tool can help you identify issues with your animation definition, animation triggering, and callback functions.

import { motion, inspect } from 'framer-motion';

function MyComponent() {
  return (
    <motion.div
      initial={{ opacity: 0 }}
      animate={{ opacity: 1 }}
      onAnimationComplete={() => console.log('Animation complete!')}
    >
      I am an animated div!
    </motion.div>
  );
}

inspect(MyComponent); // Enable animation inspection

3. Code Isolation

Code isolation is a powerful technique for identifying the source of the issue. Try isolating the problematic code and removing any unnecessary dependencies or complexity. This will help you narrow down the cause of the problem.

Solutions for Common onAnimationComplete Issues

Now that we’ve explored the common causes and debugging techniques, let’s dive into some solutions for specific onAnimationComplete issues.

1. onAnimationComplete Not Firing on Repeat Animations

If you’re experiencing issues with onAnimationComplete not firing on repeat animations, try using the `onAnimationComplete` prop on the `motion` component itself, rather than the `animate` prop.

import { motion } from 'framer-motion';

function MyComponent() {
  return (
    <motion.div
      initial={{ opacity: 0 }}
      animate={{ opacity: 1 }}
      repeat={Infinity}
      onAnimationComplete={() => console.log('Animation complete!')} // Use onAnimationComplete on the motion component
    >
      I am an animated div!
    </motion.div>
  );
}

2. onAnimationComplete Not Firing on Conditional Animations

If you’re experiencing issues with onAnimationComplete not firing on conditional animations, try using a wrapper component to handle the animation logic.

import { motion } from 'framer-motion';

function AnimatedDiv({ isEnabled }) {
  return (
    <motion.div
      initial={{ opacity: 0 }}
      animate={{ opacity: isEnabled ? 1 : 0 }}
      onAnimationComplete={() => console.log('Animation complete!')}
    >
      I am an animated div!
    </motion.div>
  );
}

function MyComponent() {
  const [isEnabled, setIsEnabled] = useState(false);

  return (
    <AnimatedDiv isEnabled={isEnabled} />
  );
}

Conclusion

And there you have it! With this comprehensive guide, you should now be well-equipped to tackle even the most stubborn onAnimationComplete issues in your Framer-Motion project. Remember to stay calm, debug methodically, and don’t hesitate to reach out for help when needed. Happy coding!

Troubleshooting Step	Description
1. Check animation definition	Verify that the animation is correctly defined and triggered.
2. Verify callback function	Ensure that the onAnimationComplete callback function is correctly defined and returns a valid value.
3. Inspect animation	Use Framer-Motion’s animation inspection tool to visualize and debug the animation.
4. Isolate code	Isolate the problematic code and remove unnecessary dependencies or complexity.
5. Check for conflicts	Verify that there are no conflicts with other animation libraries or Framer-Motion versions.