Having an issue where I receive the error message "this.cancelOrderFunction is not a function" when trying to execute a method within a child component in Vue.js

I'm facing an issue while trying to execute a method that changes the text content of the currentStatus variable when the Confirm Cancel button is clicked. The button is located in the child component within a dialog box, while the method is supposed to be in the parent component. To tackle this, I am attempting to pass this method as props to the child component. However, despite writing the code below, I keep encountering the error, "this.cancelOrderFunction is not a function," in the console. Although I understand that this error is minor, I am struggling to pinpoint its source. Below is the code I've utilized to try and resolve this issue:

changeStatus.vue (Parent Component)

<template>
    <cancelOrder :cancelOrderFunction="cancelOrderFunction"></cancelOrder>
</template>

<script>
import cancelOrder from "../components/cancelOrder.vue"; /*importing child component*/
export default {
  data: () => ({
    currentStatus: "ACTIVE",
  }),
  methods: {
    cancelOrderFunction() {
      this.currentStatus = "CANCELLED";
    },
  },
  components: {
    cancelOrder,
  },
};
</script>

cancelOrder.vue (Child Component)

<template>
    <v-btn @click="confirmCancelOrder">Confirm Cancel</v-btn>
</template>

<script>
export default {
  props: ["cancelOrderFunction"],
  methods: {
    confirmCancelOrder() {
      this.cancelOrderFunction();
    },
  },
};
</script>

The cancelOrder.vue component contains a Cancel Order button that opens a dialog box. Within the dialog box, there is a Confirm Cancel button, which upon being clicked, should simultaneously close the dialog box and trigger the cancelOrderFunction. While the dialog box closes successfully, the method is not being invoked due to the error mentioned earlier.

Answer №1

Variables are restricted to being passed to children. If you need to invoke a function from a child component that is within a parent component, the recommended approach is to use the "emit" method.

https://vuejs.org/guide/components/events.html#emitting-and-listening-to-events

Another suggestion is to bind "this" as a v-model, as it combines both the value and emitted values in one. However, this may vary depending on the specific scenario.

Below is the example illustrating how to use "emit" for this purpose. Please let me know if this aligns with your intended approach.

changeStatus.vue (Parent Component)

<template>        
        <cancelOrder @cancel-order-function="cancelOrderFunction"></cancelOrder>
</template>
<script>
...
methods: {
    cancelOrderFunction(data) {
    //perform actions with the received data
    }
}
...
</script>

cancelOrder.vue (Child Component)

<template>
    <v-btn @click="confirmCancelOrder">Confirm Cancel</v-btn>
</template>

<script>
export default {
  emits: ["cancel-order-function"],
  methods: {
    cancelOrderFunction() {
      this.$emit('cancel-order-function', data)
    },
  },
};
</script>

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