emit a function call to the parent element in a vuejs formkit custom input using composition plus typescript api in typescript

To emit a function call to the parent element in a Vue.js Formkit custom input using Composition API and Typescript API in Typescript, you can use the emits option to define the event that should be emitted from the child component.

Here's an example of how you can achieve this:


index.ts
<template>
  <div>
    <input v-model="value" />
    <button @click="handleClick">Emit Parent Event</button>
  </div>
</template>

<script lang="ts">
import { defineComponent, PropType } from 'vue';

export default defineComponent({
  name: 'CustomInput',
  props: {
    value: {
      type: String as PropType<string>,
      required: true
    },
    onCustomEvent: {
      type: Function as PropType<(eventData: any) => void>,
      required: true
    }
  },
  emits: ['customEvent'],
  setup(props, { emit }) {
    function handleClick() {
      emit('customEvent', 'data to emit');
    }

    return {
      handleClick
    };
  }
});
</script>
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In the example above, we define the onCustomEvent prop, which accepts a callback function that should be called when the custom event is emitted from the child component. We also define the emits option to specify that the customEvent event should be emitted from the child component.

In the setup() function, we define a handleClick() function that emits the customEvent event and passes some data as an argument. When the handleClick() function is called, it will emit the customEvent event with the data provided.

Finally, in the parent component, you can pass a callback function to the onCustomEvent prop to handle the emitted event:


index.ts
<template>
  <div>
    <CustomInput v-model="inputValue" :onCustomEvent="handleCustomEvent" />
  </div>
</template>

<script lang="ts">
import { defineComponent } from 'vue';
import CustomInput from './CustomInput.vue';

export default defineComponent({
  name: 'ParentComponent',
  components: {
    CustomInput
  },
  data() {
    return {
      inputValue: ''
    };
  },
  methods: {
    handleCustomEvent(eventData: any) {
      console.log('Custom Event Emited:', eventData);
    }
  }
});
</script>
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In the parent component, we define a handleCustomEvent() method that will be called when the customEvent event is emitted from the child component.

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