How to process forms in Vue?

With the popularity of web applications, forms have become an important part of user interaction. In Vue.js, we can use the instructions and methods it provides to process forms, making development more convenient. This article will introduce the processing of forms in Vue, including form binding, verification, submission, etc.

1. Binding of forms

The v-model directive is used in Vue to implement two-way binding of form fields and data. We can use this directive on a form element to bind the form's value to the component's data. As shown below:

<template>
  <div>
    <input type="text" v-model="inputValue" placeholder="请输入...">
    <p>{{ inputValue }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      inputValue: ''
    }
  }
}
</script>

In the above code, we bind the value attribute of the input element to the inputValue data of the component, thus achieving two-way binding. When the user modifies the value of the form through the input box, Vue will automatically update the component data. Likewise, views are automatically updated when component data is modified.

2. Verification of the form

Before submitting the form, we usually need to verify the form data to ensure that the data is legal and complete. In Vue.js, you can also use the validation plug-in it provides to validate form data. Among them, the most common verification plug-in is Vuelidate.

Vuelidate provides a variety of verification rules and methods that can be used to verify input values ​​in the form. Some commonly used verification rules are as follows:

• required: The value must exist.
• minLength: The length of the value must be greater than or equal to the specified length.
• maxLength: The length of the value must be less than or equal to the specified length.
• email: Value must be in a valid email format.

We can apply these rules to the form's values ​​and check them before the form is submitted. As shown below:

<template>
  <div>
    <form @submit.prevent="submitForm">
      <input type="text" v-model="username" placeholder="请输入用户名">
      <input type="password" v-model="password" placeholder="请输入密码">
      <button type="submit">提交</button>
    </form>
  </div>
</template>

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

export default {
  data() {
    return {
      username: '',
      password: ''
    }
  },
  validations: {
    username: { required, minLength: minLength(6) },
    password: { required, minLength: minLength(8) }
  },
  methods: {
    submitForm() {
      if (this.$v.$invalid) {
        console.log('表单校验失败')
        return
      }
      console.log('表单校验通过')
    }
  }
}
</script>

In the above code, we bind the value of the form element to the data of the component, and use the verification rules provided by Vuelidate to verify the value. After setting the validation rules in the validations option of the component, we can call the $v attribute when the form is submitted to determine whether the form data is legal. If the $v.$invalid attribute is true, form validation fails. Otherwise, the form data can be submitted.

3. Submission of the form

After the form verification passes, we need to submit the form data to the server for processing. In Vue, we can submit form data through AJAX. For example, the sample code for submitting form data using the Axios library is as follows:

<template>
  <div>
    <form @submit.prevent="submitForm">
      <input type="text" v-model="username" placeholder="请输入用户名">
      <input type="password" v-model="password" placeholder="请输入密码">
      <button type="submit">提交</button>
    </form>
  </div>
</template>

<script>
import axios from 'axios'

export default {
  data() {
    return {
      username: '',
      password: ''
    }
  },
  methods: {
    submitForm() {
      axios.post('/api/login', {
        username: this.username,
        password: this.password
      })
        .then(response => {
          console.log('表单提交成功')
        })
        .catch(error => {
          console.log('表单提交失败')
        })
    }
  }
}
</script>

In the above code, we use the post method of the Axios library when submitting the form. This method can send a POST request to the server and send the form data as the body of the request. After the request succeeds or fails, we can perform corresponding processing in the then or catch method.

Summary

Processing forms in Vue.js requires operations such as data binding, verification and submission. Vue provides v-model directives and component data to implement data binding. You can also use validation plug-ins to validate form data. After the form data is verified, we can use AJAX technology to submit the form data to the server for processing. The above is the summary of this article. I hope it will be helpful for everyone to understand the processing of Vue forms.

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