How to use Vue and Element-UI for data verification and form validation

Introduction:
In the process of web application development, form validation is a very important part. It ensures that user-entered data conforms to the expected format and requirements, thereby improving application stability and data accuracy. Vue.js is a very popular JavaScript framework at present, and Element-UI is a set of UI component libraries based on Vue.js, which provides a wealth of form components and verification methods to facilitate developers to perform form verification. This article will introduce how to use Vue and Element-UI for data verification and form validation, and attach corresponding code examples.

1. Install Element-UI and configure the Vue project
First, we need to install Element-UI and configure the Vue project. You can install Element-UI through the following command:

npm install element-ui --save

Then, introduce Element-UI in the main.js file:

import Vue from 'vue';
import ElementUI from 'element-ui';
import 'element-ui/lib/theme-chalk/index.css';

Vue.use(ElementUI);

2. Basic usage of form verification
Element-UI Provides a series of verification methods and instructions to easily complete form verification. The following is a simple example that shows how to use Element-UI for basic form validation:

<template>
  <el-form ref="form" :model="form" :rules="rules" label-width="80px">
    <el-form-item label="用戶名" prop="username">
      <el-input v-model="form.username"></el-input>
    </el-form-item>
    <el-form-item label="密碼" prop="password">
      <el-input type="password" v-model="form.password"></el-input>
    </el-form-item>
    <el-form-item>
      <el-button type="primary" @click="submitForm">提交</el-button>
      <el-button @click="resetForm">重置</el-button>
    </el-form-item>
  </el-form>
</template>

<script>
export default {
  data() {
    return {
      form: {
        username: '',
        password: ''
      },
      rules: {
        username: [
          { required: true, message: '請(qǐng)輸入用戶名', trigger: 'blur' },
          { min: 3, max: 10, message: '用戶名長(zhǎng)度在3到10個(gè)字符之間', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '請(qǐng)輸入密碼', trigger: 'blur' },
          { min: 6, max: 20, message: '密碼長(zhǎng)度在6到20個(gè)字符之間', trigger: 'blur' }
        ]
      }
    };
  },
  methods: {
    submitForm() {
      this.$refs.form.validate(valid => {
        if (valid) {
          // 表單驗(yàn)證通過(guò)，可以提交表單
          console.log('表單驗(yàn)證通過(guò)');
        } else {
          // 表單驗(yàn)證不通過(guò)
          console.log('表單驗(yàn)證不通過(guò)');
          return false;
        }
      });
    },
    resetForm() {
      this.$refs.form.resetFields();
    }
  }
};
</script>

In the above code, we use the el-form component to wrap two el-form-item components, where el -input is the input box component provided by Element-UI. Through two-way binding of the v-model instruction and form data, the synchronous update of the input box and form data is realized.

In the data option, we define the data and validation rules of the form. Validation rules are passed to the el-form component through the rules attribute, specifying the validation rules for each field. In the above example, we defined required rules and length rules for the username and password fields.

In the submitForm method, we call the this.$refs.form.validate method for form verification. This method will return a Boolean value indicating whether the form validation passes. If the verification passes, we can submit the form data; if the verification fails, we can prevent the form from being submitted.

In the resetForm method, we use the this.$refs.form.resetFields method to reset the form data.

The above is the basic usage of using Element-UI for form verification.

3. Customized verification rules
In addition to using the verification rules provided by Element-UI, we can also customize verification rules. The following is an example of a custom mobile phone number verification rule:

<template>
  <el-form ref="form" :model="form" :rules="rules" label-width="80px">
    <el-form-item label="手機(jī)號(hào)碼" prop="phone">
      <el-input v-model="form.phone"></el-input>
    </el-form-item>
    <el-form-item>
      <el-button type="primary" @click="submitForm">提交</el-button>
      <el-button @click="resetForm">重置</el-button>
    </el-form-item>
  </el-form>
</template>

<script>
export default {
  data() {
    return {
      form: {
        phone: ''
      },
      rules: {
        phone: [
          { required: true, message: '請(qǐng)輸入手機(jī)號(hào)碼', trigger: 'blur' },
          { validator: this.validatePhone, trigger: 'blur' }
        ]
      }
    };
  },
  methods: {
    validatePhone(rule, value, callback) {
      const reg = /^1[3|4|5|7|8][0-9]d{8}$/;
      if (reg.test(value)) {
        callback();
      } else {
        callback(new Error('手機(jī)號(hào)碼格式不正確'));
      }
    },
    submitForm() {
      this.$refs.form.validate(valid => {
        if (valid) {
          // 表單驗(yàn)證通過(guò)，可以提交表單
          console.log('表單驗(yàn)證通過(guò)');
        } else {
          // 表單驗(yàn)證不通過(guò)
          console.log('表單驗(yàn)證不通過(guò)');
          return false;
        }
      });
    },
    resetForm() {
      this.$refs.form.resetFields();
    }
  }
};
</script>

In the above code, we specify the verification method validatePhone using the validator attribute by adding a custom verification rule. In the validatePhone method, we use regular expressions to determine whether the mobile phone number meets the requirements. If the verification passes, we call callback(); if the verification fails, we call callback(new Error('Mobile phone number format is incorrect')).

Through the above code examples, we can see that Vue and Element-UI provide a complete set of form validation mechanisms that can meet most validation needs. Using Vue and Element-UI for data verification and form validation can make our development work more efficient and simpler. I hope this article can help you, thank you for reading!

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