Error in v-on handler: "ReferenceError: id is not defined"

This error message usually occurs when you are trying to access a variable or property that has not been defined or initialized. In this case, it seems that the variable "id" is not defined in the context where the v-on handler is being used.

To fix this error, you need to make sure that the "id" variable is declared and initialized before it is used in the v-on handler. You can do this by defining the "id" variable in the component's data object or by passing it as a prop from a parent component.

For example, if you are using the v-on directive to handle a click event on a button and you want to pass the "id" of the clicked button to a method, you can define the "id" variable in the component's data object like this:

<template>
  <button v-for="item in items" v-bind:key="item.id" v-on:click="handleClick(item.id)">
    {{ item.name }}
  </button>
</template>

<script>
export default {
  data() {
    return {
      items: [
        { id: 1, name: 'Item 1' },
        { id: 2, name: 'Item 2' },
        { id: 3, name: 'Item 3' }
      ]
    }
  },
  methods: {
    handleClick(id) {
      console.log('Clicked item with id:', id)
    }
  }
}
</script>

In this example, the "id" variable is passed as an argument to the "handleClick" method when the button is clicked. The "handleClick" method then logs the "id" to the console.