Form validation rules and implementation in Vue.js

In Vue.js, we often need to validate form data entered by users. To ensure data accuracy and completeness, Vue provides a simple yet powerful way to define and apply validation rules. This article will introduce how to write validation rules in Vue methods and provide corresponding source code examples.

1. Define validation rules
   In Vue, we can use v-modeldirectives to bind form input fields and implement validation by defining validation rules in data attributes. Common validation rules include required fields, length limits, format verification, etc. Here is an example showing how to define validation rules in Vue's data attribute:

data() {
   
    
    
  return {
   
    
    
    formData: {
   
    
    
      username: '',