How to see vue verification

Vue.js is a popular front-end framework that supports the creation of complex user interfaces through template syntax and component system. During the development process, form validation is an issue that must be considered. Vue.js provides some validation tools to help developers create reliable form validation. This article will introduce how to use Vue.js for form validation and how to debug Vue. js validation problem.

1. Vue.js form verification

Vue.js provides some verification instructions and plug-ins that can be used to verify the data in the form. These instructions and plug-ins are implemented for the form binding (v-model) instruction of Vue.js. The following are the commonly used instructions and plug-ins for Vue.js form validation:

1. v-model instruction: This is the instruction in Vue.js used to bind form elements and data attributes in Vue instances. It can Automatically handle changes in form element values, that is, when the value of the form element changes, the data attributes bound to the Vue instance will also change accordingly.
2. v-bind directive: This is the directive in Vue.js used to bind non-form elements and data attributes in Vue instances. It can bind data attributes in Vue instances to attributes of non-form elements. or attribute value.
3. v-on directive: This is the directive used in Vue.js to bind events and event handling functions. You can use this directive to listen to various events of form elements and perform corresponding operations.
4. VeeValidate plug-in: This is a popular form validation plug-in that can be used to verify whether the data in the form meets the requirements. It supports a variety of verification rules, such as required, email, password, etc. After adding the VeeValidate directive and corresponding validation rules to the form, VeeValidate will automatically validate the form data according to the rules.

Let’s take a look at how to use Vue.js and VeeValidate plugins for form validation.

2. Vue.js form validation example

Let’s first take a look at how to use the VeeValidate plug-in to verify whether the form data meets the requirements and give corresponding prompt information. The following is a simple form validation example:

<template>
   <form @submit.prevent="submitForm">
      <div>
         <label>Email:</label>
         <input type="text" v-model="email" v-validate="'required|email'">
         <span v-show="errors.has('email')">{{ errors.first('email') }}</span>
      </div>
      <div>
         <label>Password:</label>
         <input type="password" v-model="password" v-validate="'required'">
         <span v-show="errors.has('password')">{{ errors.first('password') }}</span>
      </div>
      <div>
         <button type="submit">Submit</button>
      </div>
   </form>
</template>

<script>
   import { required, email } from 'vee-validate/dist/rules';
   import { extend } from 'vee-validate';
   import { ValidationProvider } from 'vee-validate';

   extend('email', email);
   extend('required', required);

   export default {
      name: 'LoginForm',
      components: {
         ValidationProvider
      },
      data() {
         return {
            email: '',
            password: ''
         };
      },
      methods: {
         submitForm() {
            if (this.$validator.validate()) { // 验证表单
               console.log("表单验证成功"); // 验证成功，提交表单
            }
         }
      }
   }
</script>

In the above code, we first introduce the required and email verification rules in the VeeValidate plug-in, and use the extend method to register these rules with VeeValidate. Then a form element is added to the template, including two labels and corresponding input elements. These input elements use v-model to bind the corresponding attributes in the Vue instance, and also use the v-validate directive to add validation rules. The following are the form validation rules:

1. The Email field is required and must be in a legal email format.
2. Password field is required.

For each validation rule in the form, we add a span element that can be set whether to display based on the error message. Finally, in the submitForm method, we use the $validator.validate() method to verify whether the data in the form conforms to the rules. If the verification is successful, "Form verification successful" will be output and the form will be submitted.

3. Debugging of Vue.js verification issues

In actual development, because Vue.js form validation needs to meet a large number of strict rules, developers may encounter some verification problems. In order to solve these problems, we need to use the debugging tools provided by Vue.js to debug.

Vue.js provides Vue Devtools and Vue.js Chrome debugging tools, which can be used to check various states and events in Vue.js applications. In addition, we can also view form validation logs and debugging information through the browser's developer tools.

In short, when performing form validation, developers must understand the validation instructions and plug-ins in Vue.js, and use debugging tools to check validation issues in the application. In this way, the reliability and efficiency of the code can be maximized.

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