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Vue3 brings a host of new features aimed at enhancing your development workflow, and one standout feature is defineModel. This powerful helper function simplifies two-way data binding, reducing boilerplate code and improving readability. Vue3 defineModel will help you define your props as v-model easiest way.

What is defineModel?

defineModel is a utility in Vue 3 designed to streamline the creation of two-way bindings for props. By reducing repetitive code, it makes your components more concise and easier to understand.

How to use Vue3 defineModel?

To leverage defineModel, you simply define it in your script setup. This approach facilitates seamless prop binding and event emission, leading to cleaner code.

Example:
Here’s a straightforward example demonstrating how defineModel can simplify two-way binding for a title prop.

Using Composition API:

Without defineModel:

<template>
  <input :value="title" @input="$emit('update:title', $event.target.value)" />
</template>

<script setup>
defineProps(['title']);
defineEmits(['update:title']);
</script>

With defineModel:

<template>
  <input v-model="title" />
</template>

<script setup>
const title = defineModel('title');
</script>

Using Options API:

Without defineModel:

<template>
  <input :value="title" @input="$emit('update:title', $event.target.value)" />
</template>

<script>
export default {
  props: {
    title: String
  },
  methods: {
    updateTitle(event) {
      this.$emit('update:title', event.target.value);
    }
  }
}
</script>

With defineModel:

<template>
  <input v-model="title" />
</template>

<script>
import { defineComponent } from 'vue';
import { defineModel } from '@vue/composition-api';

export default defineComponent({
  setup() {
    const title = defineModel('title');
    return { title };
  }
});
</script>

In the second examples of both APIs, defineModel automatically manages the binding and event emission, resulting in a cleaner and more readable component.

Benefits of Using defineModel

• Reduced Boilerplate: Significantly less code to write and maintain.
• Improved Readability: Cleaner syntax makes it easier to understand your components at a glance.
• Streamlined Logic: Automatically handles prop binding and event emission, simplifying your logic.

Conclusion

Incorporating Vue3 defineModel can greatly enhance your two-way binding strategy, making your components more concise and easier to maintain. This is particularly advantageous in larger projects where maintaining a clean codebase is crucial. By adopting defineModel, you ensure your Vue 3 applications are both robust and readable.

There is vue3 official page for component v-model

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