In Vue 3, how to implement synchronous input of multiple input box contents using ref and computed?

How to implement synchronous input of multiple input boxes in Vue 3?

When building Vue 3 applications, it is often necessary to realize real-time synchronization of multiple input boxes. For example, an address form, you want the contents of the provincial, municipal, and district input boxes to be automatically merged into a total address box. This article will introduce how to use ref and computed properties of Vue 3 to efficiently implement this function.

First, use ref to create a responsive variable to store the value of each input box, and then computed to calculate the merged address.

The following code example demonstrates this process:

 import { ref, calculated } from 'vue';

// Use ref to create responsive variables, storing the values ​​of provinces, cities and districts respectively const province = ref('');
const city = ref('');
const district = ref('');

// Use computed to calculate the merged address const address = computed(() => [province.value, city.value, district.value].join(' '));

In the code, province , city and district correspond to the values ​​of the province, city and district input boxes respectively. When these values ​​change, computed property will automatically recalculate the address value, thereby real-time synchronization of the input box content. The join(' ') method connects the values ​​of provinces, cities and districts with spaces to form a complete address string.

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