How to handle data formatting and validation in Vue

Vue is a popular front-end framework that provides a concise way to handle data formatting and validation. This article will introduce how to handle data formatting and validation in Vue, and provide some specific code examples.

1. Data Formatting
In Vue, we often need to format the input data so that it can meet specific format requirements when displayed. Below are some common data formatting examples.

1. Date formatting
   For date data, we can use the moment.js library to format it. First, we need to introduce the moment.js library into the project, and then we can use the methods it provides to format date data.

<template>
  <div>
    <p>{{ formatDate(date) }}</p>
  </div>
</template>

<script>
import moment from 'moment';

export default {
  data() {
    return {
      date: '2022-01-01',
    };
  },
  methods: {
    formatDate(date) {
      return moment(date).format('YYYY年MM月DD日');
    },
  },
};
</script>

2. Number formatting
   When displaying numerical data such as amounts, we usually need to format it according to requirements, such as adding thousands separators, retaining specified digits of decimals, etc. . Vue provides a filter to handle such requirements.

<template>
  <div>
    <p>{{ amount | formatMoney }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      amount: 1000,
    };
  },
  filters: {
    formatMoney(value) {
      return value.toLocaleString();
    },
  },
};
</script>

2. Data Verification
In addition to data formatting, we often need to verify the data entered by the user to ensure the legality of the data. Vue provides some built-in validation functions and also supports the use of third-party validation libraries.

1. Built-in validation
   Vue's built-in validation function can implement common form validation by using the v-model directive and the required attribute.

<template>
  <div>
    <input v-model="name" type="text" :class="{ 'error': !validateName }" required />
    <button @click="submit">提交</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      name: '',
    };
  },
  computed: {
    validateName() {
      return this.name.length > 0;
    },
  },
  methods: {
    submit() {
      if (this.validateName) {
        // 提交数据
      } else {
        // 提示用户输入内容
      }
    },
  },
};
</script>

2. Use third-party libraries
   If you need more complex verification requirements, we can use some third-party verification libraries, such as Vuelidate. Below is an example of using Vuelidate for form validation.

First, we need to introduce the Vuelidate library into the project.

<template>
  <div>
    <input v-model="email" type="text" :class="{ 'error': $v.email.$error }" />
    <button @click="submit">提交</button>
  </div>
</template>

<script>
import { required, email } from 'vuelidate/lib/validators';

export default {
  data() {
    return {
      email: '',
    };
  },
  validations: {
    email: {
      required,
      email,
    },
  },
  methods: {
    submit() {
      if (!this.$v.$invalid) {
        // 提交数据
      } else {
        // 提示用户输入正确的邮箱
      }
    },
  },
};
</script>

The above are some common methods and examples of formatting and validating data in Vue. You can choose the appropriate way to process data according to specific needs. Hope this article is helpful to you!

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