Error in v-on handler: "TypeError: Cannot read properties of undefined (reading 'outerHTML')"

This error occurs when you are trying to access a property or method of an undefined object in a v-on handler.

To fix this error, you need to check that the object you are trying to access is defined before attempting to access its properties or methods. You can use conditional statements or error handling techniques like try-catch to prevent this error from occurring.

For example, if you are trying to access the outerHTML property of an element in a v-on handler, you can check if the element is defined before accessing its properties like this:

<div v-on:click="handleClick($event.target)">
  Click me
</div>

methods: {
  handleClick(el) {
    if (el) {
      console.log(el.outerHTML);
    } else {
      console.error('Element is undefined');
    }
  }
}

In this example, we pass the target element of the click event to the handleClick method. The method checks if the element is defined before accessing its outerHTML property. If the element is undefined, it logs an error message to the console.