How to use the input box carriage return event and verification function in the Vue document

Vue is a popular JavaScript front-end framework with a responsive data binding and component system at its core. In Vue applications, the input box is one of the most commonly used UI elements. When the user enters text, we hope to listen for the carriage return event and validate the input before submitting. This article will introduce the input box enter event and verification function usage in the Vue document.

1. Enter event of the input box in Vue

It is very simple to monitor the enter event of the input box in Vue. We only need to use the @keydown.enter modifier , you can monitor the carriage return event. For example:

<template>
  <div>
    <input v-model="content" @keydown.enter="submitForm">
    <button @click="submitForm">提交</button>
  </div>
</template>
<script>
export default {
  data() {
    return {
      content: ''
    }
  },
  methods: {
    submitForm() {
      // 提交表单代码
    }
  }
}
</script>

In the above code, we use the v-model directive to bind the content attribute and the value of the input box. When the Enter key is pressed or the "Submit" button is clicked, the submitForm method is called to submit the form.

2. Verification function of the input box in Vue

When validating the input content of the form in Vue, we can write a check function to ensure the integrity and correctness of the form data . This function can be called before the form is submitted to check the entered data. The following is an example of using a function to validate form data:

<template>
  <div>
    <input v-model="username" @blur="checkUsername">
    <input v-model="password" @blur="checkPassword">
    <button @click="submit">提交</button>
  </div>
</template>
<script>
export default {
  data() {
    return {
      username: '',
      password: '',
      usernameError: '',
      passwordError: ''
    }
  },
  methods: {
    checkUsername() {
      if (!this.username) {
        this.usernameError = '用户名不能为空';
      } else {
        this.usernameError = '';
      }
    },
    checkPassword() {
      if (!this.password) {
        this.passwordError = '密码不能为空';
      } else {
        this.passwordError = '';
      }
    },
    submit() {
      this.checkUsername();
      this.checkPassword();
      if (!this.usernameError && !this.passwordError) {
        // 提交表单代码
      }
    }
  }
}
</script>

In the above code, we bind username and ## through the v-model directive #passwordThe value of the attribute and input box. Verify the content of the input box in the checkUsername and checkPassword methods. If the verification fails, set the corresponding error message; otherwise, set the error message to empty. On clicking the "Submit" button, we call the submit method to check the input and submit the form.

@keydown.enter modifier to listen for the carriage return event and writing a check function to verify the input content, simple and reliable form processing can be achieved. In the development of Vue, understanding and mastering these skills will help us implement front-end applications more efficiently.

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