How to synchronize multiple input box contents through computed attribute in Vue.js?

Vue.js realizes the synchronization of input box content: automatic merge of provinces, cities and district addresses

In form design, it is often necessary to synchronize multiple input boxes, such as real-time merger of provincial, municipal and regional addresses. This article will demonstrate how to easily implement this feature using Vue.js to improve the user experience.

The following figure shows the target effect: after the user enters the content in the three input boxes (province, city, and district) above, the input box below will automatically display the combined complete address.

We will use ref and computed features of Vue 3. The code is as follows:

 import { ref, calculated } from 'vue';

const province = ref('');
const city = ref('');
const district = ref('');

const address = computed(() => [province.value, city.value, district.value].join(' '));

Code explanation:

First, we use ref to create three responsive data variables province , city and district , corresponding to the values ​​of the province, city and district input boxes respectively. These variables are automatically updated when the content of the input box changes.

Then, computed property address calculates in real time and returns a string that is spliced ​​by the values ​​of province , city and district , separated by spaces. This address value will be bound to the input box below which displays the full address.

Through this concise way, we have achieved real-time merger of provincial, municipal and regional addresses, significantly improving the usability and user experience of the form.

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