Unlock the Power of Form Input Binding in Vue.js

What is Data Binding?

Data binding is a two-way process that synchronizes user input with your application’s data model. This means that as users interact with your app, their input is instantly reflected in the data model, and vice versa.

Getting Started with Vue.js

Before diving into the world of form input binding, ensure you have the following setup:

• Node.js version 10.x or higher installed
• A code editor like Visual Studio Code
• Vue’s latest version installed globally on your machine
• Vue CLI 3.0 installed on your machine
• A Vue starter project downloaded and unzipped

The v-model Directive: Two-Way Data Binding

The v-model directive is the key to unlocking two-way data binding in Vue.js. When attached to an input field, it monitors user input and updates the corresponding template section in real-time. Conversely, if the data model changes, the input field is updated accordingly.

Building a Vue Visa App

To demonstrate two-way data binding, let’s create a basic Vue visa app with a preview section. Start by opening the app.vue file in your development environment and creating a new test.vue component. Add the following code block to the template section to create a form with labels for identification and other important information.

<template>
  <form>
    <label>Identification:</label>
    <input type="text" />
    <br>
    <label>Other Important Information:</label>
    <input type="text" />
  </form>
</template>

Input Binding: The v-model Directive in Action

Now that we have our visa application form up and running, let’s use the v-model directive to bind user input to our data object. This will enable us to display a preview of the entered information before the user submits the form.

<template>
  <form>
    <label>Identification:</label>
    <input type="text" v-model="identification" />
    <br>
    <label>Other Important Information:</label>
    <input type="text" v-model="otherInfo" />
  </form>
  <p>Preview:</p>
  <p>Identification: {{ identification }}</p>
  <p>Other Important Information: {{ otherInfo }}</p>
</template>

<script>
export default {
  data() {
    return {
      identification: '',
      otherInfo: ''
    }
  }
}
</script>

Bonus Tip: The Lazy Property

To take input binding to the next level, leverage the lazy property of the v-model directive. This allows you to delay binding until the user leaves the input field, providing a more seamless experience.

<input type="text" v-model.lazy="identification" />