validator method in vue

The Validator method is the built-in validation method of Vue.js, used to write custom form validation rules. The usage steps include: importing the Validator library; creating validation rules; instantiating Validator; adding validation rules; validating input; and obtaining validation results.

Validator method in Vue

The Validator method is a built-in validation method in Vue.js, used for Write custom form validation rules. It can be used to validate user input, ensuring the data is valid before submitting the form.

How to use the Validator method

To use the Validator method, follow these steps:

1. Import Validator Library:

   <code class="javascript">import { Validator } from 'vee-validate';</code>

2. Create validation rules:

   <code class="javascript">const rules = {
     required: value => !!value,
     minLength: value => value.length >= 6,
   };</code>

3. Instantiate Validator:

   <code class="javascript">const validator = new Validator();</code>

4. Add validation rules:

   <code class="javascript">validator.extend('required', rules.required);
   validator.extend('minLength', rules.minLength);</code>

5. Validate input:

   <code class="javascript">const result = await validator.validate({
     name: 'John',
     email: 'john@example.com',
   });</code>

6. Get verification results:

   <code class="javascript">if (result.failed) {
     // 验证失败
   } else {
     // 验证成功
   }</code>

Example

The following example demonstrates how Validate the form using the Validator method:

<code class="html"><template>
  <form @submit.prevent="submit">
    <input type="text" v-model="name" />
    <input type="email" v-model="email" />

    <button type="submit">提交</button>
  </form>
</template>

<script>
import { Validator } from 'vee-validate';

export default {
  data() {
    return {
      name: '',
      email: '',
    };
  },
  methods: {
    async submit() {
      const rules = {
        required: value => !!value,
        minLength: value => value.length >= 6,
        email: value => /\S+@\S+\.\S+/.test(value),
      };

      const validator = new Validator();
      validator.extend('required', rules.required);
      validator.extend('minLength', rules.minLength);
      validator.extend('email', rules.email);

      const result = await validator.validate({
        name: this.name,
        email: this.email,
      });

      if (result.failed) {
        // 处理验证失败
      } else {
        // 表单数据有效，提交表单
      }
    },
  },
};
</script></code>

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